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<article article-type="review-article" dtd-version="1.0" xml:lang="hr" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML">
<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">LV</journal-id>
<journal-id journal-id-type="nlm-ta">Lijec Vjesn</journal-id>
<journal-title-group>
<journal-title>Lijecnicki Vjesnik</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Lijec. Vjesn.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="ppub">0024-3477</issn>
<issn pub-type="epub">1849-2177</issn>
<publisher><publisher-name>Croatian Medical Association</publisher-name></publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">LV-144-392</article-id>
<article-id pub-id-type="doi">10.26800/LV-144-11-12-7</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group>
</article-categories>
<title-group>
<article-title>Kardiovaskularno zdravlje u menopauzi</article-title>
<trans-title-group xml:lang="en">
<trans-title>Cardiovascular health in menopause</trans-title>
</trans-title-group>
</title-group>
<contrib-group>
<contrib contrib-type="author"><name><surname>Jandri&#x0107;</surname><given-names>Ivan</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1747-204X</contrib-id><name><surname>&#x0160;prem Gold&#x0161;tajn</surname><given-names>Marina</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Ore&#x0161;kovi&#x0107;</surname><given-names>Slavko</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Bolan&#x010D;a</surname><given-names>Ivan</given-names></name><xref ref-type="aff" rid="aff3"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Grizelj</surname><given-names>Boris</given-names></name><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Miku&#x0161;</surname><given-names>Mislav</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib>
<aff id="aff1"><label>1</label>Op&#x0107;a bolnica &#x201E;Dr. Josip Ben&#x010D;evi&#x0107;&#x201D;, Slavonski Brod</aff>
<aff id="aff2"><label>2</label>Klinika za &#x017E;enske bolesti i porode, Medicinski fakultet Sveu&#x010D;ili&#x0161;ta u Zagrebu, Klini&#x010D;ki bolni&#x010D;ki centar Zagreb</aff>
<aff id="aff3"><label>3</label><institution>Klini&#x010D;ki bolni&#x010D;ki centar Sestre milosrdnice</institution>, <addr-line>Zagreb</addr-line></aff>
<aff id="aff4"><label>4</label>Sveu&#x010D;ili&#x0161;na klini&#x010D;ka bolnica Mostar</aff>
</contrib-group>
<author-notes>
<corresp id="cor1">Adresa za dopisivanje: Prof. dr. sc. Marina &#x0160;prem Gold&#x0161;tajn, dr. med., <ext-link ext-link-type="uri" xlink:href="https://orcid.org/0000-0003-1747-204X">https://orcid.org/0000-0003-1747-204X</ext-link> &#x2028;Klinika za &#x017E;enske bolesti i porode, Petrova 13, 10000 Zagreb, e-po&#x0161;ta: <email xlink:href="marina.goldstajn@gmail.com">marina.goldstajn@gmail.com</email></corresp></author-notes>
<pub-date pub-type="epub-ppub"><month>12</month><year>2022</year></pub-date>
<volume>144</volume>
<issue>11-12</issue>
<fpage>392</fpage>
<lpage>401</lpage>
<permissions>
<copyright-year>2022</copyright-year>
<copyright-holder>Croatian Medical Association</copyright-holder>
<license xlink:href="https://creativecommons.org/licenses/by-nc-nd/4.0/" specific-use="CC BY-NC-ND 4.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (CC BY-NC-ND) 4.0 License.</license-p></license>
</permissions>
<abstract>
<title>SA&#x017D;ETAK</title>
<p>Bolesti srca i krvo&#x017E;ilnog sustava naju&#x010D;estaliji su uzrok smrtnosti u Europi. Prema najnovijim podatcima, &#x010D;ak 10% vi&#x0161;e smrtnosti od kardiovaskularnih bolesti zastupljeno je kod &#x017E;ena u odnosu na mu&#x0161;karce, &#x0161;to zna&#x010D;i da u Europi zbog kardiovaskularnih razloga godi&#x0161;nje umire 300.000 &#x017E;ena vi&#x0161;e nego mu&#x0161;karaca. U ve&#x0107;ini istra&#x017E;ivanja menopauza je istaknuta kao primarni &#x010D;imbenik koji doprinosi pove&#x0107;anju kardiovaskularnog rizika u &#x017E;ena, usprkos metodolo&#x0161;kim ograni&#x010D;enjima u obliku razdvajanja kronolo&#x0161;kog starenja i menopauze. Proaterogene promjene u lipidogramu tijekom menopauzalne tranzicije smatraju se najsna&#x017E;nijom poveznicom izme&#x0111;u nastupa menopauze i porasta kardiovaskularnog rizika. Kohortne studije nisu na&#x0161;le uzro&#x010D;nu povezanost nastupa menopauze s promjenama krvnog tlaka te homeostazom glukoze i inzulina, odnosno s rizikom razvoja &#x0161;e&#x0107;erne bolesti. Uloga estrogena u o&#x010D;uvanju kardiovaskularnog zdravlja, uza sve gore opisane izravne u&#x010D;inke na srce i krvne &#x017E;ile, uklju&#x010D;uje mehanizme kojima se regulira profil lipida, inzulinska osjetljivost te monocitno-makrofagni sustav, a &#x010D;iji ispadi funkcije doprinose multifaktorijalnom procesu ateroskleroze koji u znatnoj mjeri modulira kardiovaskularni rizik. Sinteza brojnih istra&#x017E;ivanja o molekularnim mehanizmima isti&#x010D;e da je estrogenska protekcija krvo&#x017E;ilja i srca posljedica neposrednog u&#x010D;inka estrogena na vazodilataciju, angiogenezu, unaprje&#x0111;enje mitohondrijalne funkcije i sni&#x017E;enje razine oksidativnog stresa te supresiju fibroze. Promatraju&#x0107;i sve znanstvene spoznaje o utjecajima hormonskog nadomjesnog lije&#x010D;enja na profil kardiovaskularnog rizika, bitno je znati da je razvoj HNL-a bitno pro&#x0161;irio mogu&#x0107;nost optimizacije i individualizacije terapije, a time su dodatno reducirani potencijalni rizici. Uz transdermalni put primjene, terapijske re&#x017E;ime s niskim i ultraniskim dozama hormona te primjenu prirodnoga mikroniziranog progesterona i didrogesterona, kardiovaskularno zdravlje &#x017E;ena u menopauzi mo&#x017E;e biti zna&#x010D;ajno unaprije&#x0111;eno.</p>
</abstract>
<trans-abstract xml:lang="en">
<title>SUMMARY</title>
<p>Cardiovascular diseases are the most common cause of death in Europe. They are the cause of 40% of deaths in the male population and 49% of deaths in women, which means that 300,000 more women than men die of cardiovascular causes in Europe each year. Most studies have identified menopause as the major contributor to increased cardiovascular risk in women, although it has been methodologically difficult to separate chronological aging from menopause. Pro-atherogenic changes in lipidogram during transition to menopause may be considered the strongest link between the onset of menopause and the increase in cardiovascular risk. As with blood pressure changes, cohort studies have not found a causal relationship between the onset of menopause and glucose and insulin homeostasis or the risk of developing diabetes. The role of estrogen in maintaining cardiovascular health includes, in addition to all direct cardiovascular effects described above, estrogenic mechanisms that regulate lipid profile, insulin sensitivity, and monocyte-macrophage system, the bursts of which contribute to the multifactorial process of atherosclerosis which considerably modulates cardiovascular risk. Synthesis of numerous studies on molecular mechanisms leads to the conclusion that estrogenic protection of blood vessels and the heart is due to the direct action of estrogen on vasodilation, angiogenesis, improvement of mitochondrial function and reduction of oxidative stress, and suppression of fibrosis. It is important to note that the development of hormone replacement therapy (HRT) has greatly increased the ability to optimize and individualize therapy, further reducing potential risks. With the transdermal route of administration, low- and ultralow-dose therapeutic regimens, and the use of natural micronized progesterone and dydrogesterone, cardiovascular health in menopausal women can be significantly improved.</p>
</trans-abstract>
<kwd-group kwd-group-type="author"><kwd>Deskriptori KARDIOVASKULARNE BOLESTI &#x2013; epidemiologija, patofiziologija, prevencija</kwd><kwd>MENOPAUZA &#x2013; fiziologija, metabolizam</kwd><kwd>ATEROSKLEROZA &#x2013; patofiziologija</kwd><kwd>ESTROGENI &#x2013; fiziologija, metabolizam</kwd><kwd>LIPOPROTEINI VISOKE GUSTO&#x0106;E &#x2013; u krvi</kwd><kwd>VAZOMOTORI&#x010C;KI SUSTAV</kwd><kwd>HORMONSKO NADOMJESNO LIJE&#x010C;ENJE &#x2013; metode</kwd><kwd>ESTROGENSKO NADOMJESNO LIJE&#x010C;ENJE</kwd><kwd>RIZI&#x010C;NI &#x010C;IMBENICI</kwd></kwd-group>
<kwd-group kwd-group-type="translator" xml:lang="en"><title>Descriptors </title><kwd>CARIOVASCULAR DISEASES &#x2013; epidemology, physiopathology, prevention and control</kwd><kwd>MENOPAUSE &#x2013; metabolism, physiology</kwd><kwd>ATHEROSCLEROSIS &#x2013; physiopathology</kwd><kwd>ESTROGENS &#x2013; metabolism, physiology</kwd><kwd>LIPOPROTEINS, HDL &#x2013; blood</kwd><kwd>VASOMOTOR SYSTEM</kwd><kwd>HORMONE REPLACEMENT THERAPY &#x2013; methods</kwd><kwd>ESTROGEN REPLACEMENT THERAPY</kwd><kwd>RISK FACTORS</kwd></kwd-group>
</article-meta>
</front>
<body>
<p>Prema podatcima <italic>European Heart Network</italic> (EHN), bolesti srca i krvo&#x017E;ilnog sustava uvjerljivo su naju&#x010D;estaliji uzrok smrtnosti u Europi, odgovorne za 3,9 milijuna smrti godi&#x0161;nje, odnosno 45% svih smrtnih ishoda. (<xref ref-type="bibr" rid="r1"><italic>1</italic></xref>) I dok su uzrokom 40% smrti u mu&#x0161;koj populaciji, u &#x017E;ena su kardiovaskularne bolesti odgovorne za 49% smrtnosti, &#x0161;to zna&#x010D;i da u Europi godi&#x0161;nje umre 300.000 vi&#x0161;e &#x017E;ena nego mu&#x0161;karaca zbog kardiovaskularnih razloga. U Hrvatskoj je ta razlika jo&#x0161; izra&#x017E;enija, tj. u&#x010D;estalost kardiovaskularne smrtnosti u &#x017E;ena je ve&#x0107;a za vi&#x0161;e od 10% u usporedbi s mu&#x0161;kom populacijom. (<xref ref-type="bibr" rid="r2"><italic>2</italic></xref>) Iako je takav trend prisutan jo&#x0161; od sredine osamdesetih godina pro&#x0161;log stolje&#x0107;a, i danas je u lai&#x010D;kim pa i u stru&#x010D;nim krugovima nerijetko prisutan stereotip da krvo&#x017E;ilne bolesti predstavljaju tipi&#x010D;no mu&#x0161;ku patologiju te su u percepciji &#x017E;enske populacije kardiovaskularni rizici relativno mali razlog za brigu u usporedbi s primjerice rizikom karcinoma dojke. Karcinom dojke je odgovoran za ukupno 3% mortaliteta europskih &#x017E;ena, dakle, 16 puta je izglednije da &#x0107;e &#x017E;ena umrijeti zbog kardiovaskularnih bolesti nego zbog karcinoma dojke. (<xref ref-type="bibr" rid="r3"><italic>3</italic></xref>) Uzrok ovakvoj zabludi mo&#x017E;e biti &#x010D;injenica da u reproduktivnoj dobi &#x017E;ene imaju povoljniji profil kardiovaskularnog rizika pa je tako kod njih nastup koronarne sr&#x010D;ane bolesti odgo&#x0111;en za oko deset, a akutnog infarkta miokarda i nagle sr&#x010D;ane smrti za oko dvadeset godina u odnosu na mu&#x0161;ku populaciju. Stoga, u razdoblju do 65. godine &#x017E;ivota, na kardiovaskularni mortalitet u mu&#x0161;koj populaciji otpada 31% ukupnog mortaliteta, dok je u &#x017E;enskoj on ni&#x017E;i za 26%, te je, za razliku od mu&#x0161;ke populacije, &#x201E;zasjenjen&#x201C; mortalitetom od karcinoma, koji se s udjelom od 35% u ukupnom mortalitetu name&#x0107;e kao naj&#x010D;e&#x0161;&#x0107;i uzrok smrtnosti &#x017E;ena u tom &#x017E;ivotnom razdoblju. Strmi porast kardiovaskularnog mortaliteta u &#x017E;enskoj populaciji nakon &#x0161;estog desetlje&#x0107;a &#x017E;ivota dovodi se u vezu s nizom promjena u metabolizmu i cirkulatornoj funkciji &#x010D;iji nastup koincidira s menopauzalnom tranzicijom. (<xref ref-type="bibr" rid="r4"><italic>4</italic></xref>) Cilj je ovoga preglednog rada prikazati i analizirati najva&#x017E;nija istra&#x017E;ivanja koja isti&#x010D;u menopauzu kao va&#x017E;an &#x010D;imbenik kardiovaskularnog rizika.</p>
<sec sec-type="other1">
<title>Rasprava</title>
<sec>
<title>Menopauza kao &#x010D;imbenik kardiovaskularnog rizika &#x2013; osvrt na klini&#x010D;ka istra&#x017E;ivanja</title>
<p>Iako je jo&#x0161; od vremena objave rezultata velike Framinghamske studije, 1976. godine, menopauza identificirana kao primarni &#x010D;imbenik koji doprinosi pove&#x0107;anju kardiovaskularnog rizika u &#x017E;ena, razmjerno dugo izostao je metodolo&#x0161;ki izazov razdvajanja kronolo&#x0161;kog starenja i menopauze. (<xref ref-type="bibr" rid="r5"><italic>5</italic></xref>) Precizniji odgovor ponudile su longitudinalne studije, poput <italic>Healthy Women Study</italic>, <italic>Melbourne Midlife Health Project</italic>, <italic>Fels Longitudinal Study</italic>, <italic>Chin-Shan Community Cardiovascular Cohort</italic> i kona&#x010D;no najopse&#x017E;nija, <italic>Study of Women&#x2019;s Health Across the Nation</italic> (SWAN), koje su jasnije ustanovile odnos ovarijskog starenja i kardiovaskularnog rizika. Iste su pokazale da pojedine intrinzi&#x010D;ne zna&#x010D;ajke menopauzalne tranzicije doista rezultiraju nizom promjena relevantnih za vjerojatnost nastupa kardiovaskularnih/kardiometaboli&#x010D;kih bolesti, definiraju&#x0107;i tako perimenopauzalno razdoblje kao period od kriti&#x010D;ne va&#x017E;nosti za adekvatnu skrb i strategije prevencije. (<xref ref-type="bibr" rid="r6"><italic>6</italic></xref>, <xref ref-type="bibr" rid="r7"><italic>7</italic></xref>) Posljedi&#x010D;no, menopauza je danas uva&#x017E;ena kao samostalni &#x010D;imbenik rizika prema <italic>American Heart Association</italic> (AHA), te je od 2018. godine uvr&#x0161;tena u globalne smjernice za kontrolu razine kolesterola u krvi kao &#x010D;imbenika koji potencira rizik, tj. koji favorizira odluku o uvo&#x0111;enju statinske terapije. (<xref ref-type="bibr" rid="r8"><italic>8</italic></xref>)</p>
</sec>
</sec>
<sec sec-type="other2">
<title>Lipidni status</title>
<p>Proaterogene promjene u lipidogramu tijekom menopauzalne tranzicije mogu se smatrati najsna&#x017E;nijom poveznicom izme&#x0111;u nastupa menopauze i porasta kardiovaskularnog rizika. Tajvanska studija <italic>Chin-Shan Community Cardiovascular Cohort Study</italic> uspore&#x0111;ivala je lipidni status &#x017E;ena u razdoblju od &#x010D;etiri godine (1990./91. i 1994./95.), u kontekstu aktualnog (pre- ili post-) menopauzalnog statusa (<xref ref-type="bibr" rid="r9"><italic>9</italic></xref>-<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>). Nakon prilagodbe za dob i indeks tjelesne mase (ITM), jedina zna&#x010D;ajna promjena bila je porast ukupnog kolesterola koji je najvi&#x0161;e bio izra&#x017E;en u &#x017E;ena koje su u promatranom periodu pre&#x0161;le iz premenopauzalnog u postmenopauzalni status. Glavna zamjerka ovoj studiji jest neprecizno podijeljen period perimenopauze te heterogena postmenopauzalna skupina &#x017E;ena s razli&#x010D;itim vremenskim odmacima od posljednje menstruacije. U <italic>Fels Longitudinal Study</italic> kroz razdoblje od 26 godina serijski je pra&#x0107;en lipidni status &#x017E;ena u dobi od 40 do 60 godina, koje su prolazile kroz prirodnu ili ijatrogenu menopauzu. Ustanovljen je zna&#x010D;ajan porast LDL-kolesterola u perimenopauzi i postmenopauzi u usporedbi s premenopauzalnim statusom, no, ostale su neprecizno definirane promjene u tranziciji kasne perimenopauze prema kasnoj postmenopauzi. (<xref ref-type="bibr" rid="r12"><italic>12</italic></xref>) Studija <italic>Melbourne Midlife Health Project</italic> pratila je menopauzalnu tranziciju 150 inicijalno premenopauzalnih &#x017E;ena. U njoj je pak jedina statisti&#x010D;ki zna&#x010D;ajna promjena u lipidogramu u relaciji prema menopauzi bila promjena u HDL-kolesterolu, za koji je ustanovljen porast u godini koja prethodi posljednjoj menstruaciji i koji se u sljede&#x0107;im godinama pra&#x0107;enja vra&#x0107;a na premenopauzalne vrijednosti. Ostale promjene u lipidogramu obja&#x0161;njene su dobnim u&#x010D;inkom ili promjenama u ostalim &#x010D;imbenicima rizika. Relativno mali uzorak populacije i kratko razdoblje pra&#x0107;enja glavna su ograni&#x010D;enja ovoga australskog istra&#x017E;ivanja. (<xref ref-type="bibr" rid="r13"><italic>13</italic></xref>) U <italic>Healthy Women Study</italic> uspore&#x0111;ivan je lipidni status 372 &#x017E;ene serijski pra&#x0107;en u dvije vremenske to&#x010D;ke: u prijelazu od premenopauze do jedne godine nakon posljednje menstruacije u periodu od prve do pete postmenopauzalne godine. Uo&#x010D;en je porast LDL-a i triglicerida uz paralelno sni&#x017E;enje HDL-a, i to s magnitudom svih ovih promjena znatno ve&#x0107;om u razdoblju perimenopauze nego u postmenopauzalnim godinama. (<xref ref-type="bibr" rid="r14"><italic>14</italic></xref>, <xref ref-type="bibr" rid="r15"><italic>15</italic></xref>) studija SWAN obuhvatila je 3.302 &#x017E;ene u premenopauzalnom ili ranom perimenopauzalnom razdoblju (dobi 42&#x2013;52 godine), i u protekle 23 godine pra&#x0107;enja poslu&#x017E;ila kao vrijedan instrument u definiranju utjecaja menopauzalnih promjena na zdravlje &#x017E;ena u postmenopauzalnoj dobi. Inicijalna analiza nakon sedam godina pra&#x0107;enja utvrdila je u ranim fazama menopauzalne tranzicije blago pove&#x0107;anje ukupnog kolesterola, LDL-a i triglicerida, koje potom kulminira u kasnoj perimenopauzi i ranoj postmenopauzi, potvr&#x0111;uju&#x0107;i dijelom time ranije rezultate iz <italic>Healthy Women Study.</italic> (<xref ref-type="bibr" rid="r16"><italic>16</italic></xref>, <xref ref-type="bibr" rid="r17"><italic>17</italic></xref>) Analiza nakon deset godina pra&#x0107;enja, tijekom kojega su 1054 &#x017E;ene u&#x0161;le u menopauzu, prikazala je u prvoj postmenopauzalnoj godini zna&#x010D;ajan porast ukupnog kolesterola, LDL-a i LDL-ovog glavnog povr&#x0161;inskog proteina &#x2013; apolipoproteina B (apoB), neovisno o dobi, etni&#x010D;koj pripadnosti ili po&#x010D;etnoj tjelesnoj te&#x017E;ini, &#x010D;ime je po prvi put predstavljena promjena u lipidnom statusu u specifi&#x010D;noj relaciji prema posljednjoj menstruaciji, odnosno &#x010D;ime je dokazan uniforman utjecaj menopauze na lipidni profil. Kao i u australskom istra&#x017E;ivanju, a za razliku od rezultata <italic>Healthy Women Study</italic>, najvi&#x0161;e razine HDL-a detektirane su u kasnoj perimenopauzi i ranoj postmenopauzi. Me&#x0111;utim, za razliku od stalne povezanosti ustanovljene za perimenopauzalni porast LDL-a i progresije aterosklerotskog plaka u predstoje&#x0107;em postmenopauzalnom razdoblju, naknadni rezultati ancilarne studije SWAN <italic>Heart</italic> upu&#x0107;uju na zaklju&#x010D;ak da se relacija razine HDL-a prema vaskularnom zdravlju uo&#x010D;ena u premenopauzi ne preslikava u onu koja se uo&#x010D;ava u postmenopauzi. (<xref ref-type="bibr" rid="r18"><italic>18</italic></xref>, <xref ref-type="bibr" rid="r19"><italic>19</italic></xref>) Naime, tijekom menopauzalne tranzicije mijenja se kompozicija HDL-&#x010D;estica, a time i njihov doprinos odr&#x017E;avanju kardiovaskularne homeostaze. (<xref ref-type="bibr" rid="r20"><italic>20</italic></xref>) Korelacija izme&#x0111;u razine HDL-a i subklini&#x010D;ke vaskularne bolesti (zadebljanje intime i medije karotidne arterije), koja je u predmenopauzi negativna, u postmenopauzi dobiva pozitivan predznak. Ova opservacija u skladu je s prethodno objavljenim rezultatima <italic>Los Angeles Atherosclerosis Study</italic>, gdje je prona&#x0111;ena negativna korelacija izme&#x0111;u razine HDL-a i intimo-medijalnog zadebljanja karotida u mu&#x0161;koj populaciji, ali pozitivna u &#x017E;ena u dobi 45&#x2013;60 godina. (<xref ref-type="bibr" rid="r20"><italic>20</italic></xref>) Prema ovim istra&#x017E;ivanjima, porast razine HDL-a tijekom menopauzalne tranzicije neovisno je povezan s brzom progresijom aterosklerotskog procesa, odnosno, preciznije, uz uo&#x010D;eni porast LDL-a koji neminovno doprinosi aterosklerozi, porast HDL-a nije nu&#x017E;no ateroprotektivan, ve&#x0107; mo&#x017E;e imati i proaterogeni doprinos. Ovaj fenomen dijelom je potkrijepljen i rezultatima preliminarnih istra&#x017E;ivanja u kojima je tijekom menopauzalne tranzicije prikazano smanjenje efikasnosti HDL-a u obna&#x0161;anju njegove primarne uloge &#x2013; povratnom prijenosu kolesterola &#x2013; fiziolo&#x0161;kom mehanizmu kojim se sprje&#x010D;ava nakupljanje kolesterola u perifernim tkivima i usporava aterogeneza. (<xref ref-type="bibr" rid="r20"><italic>20</italic></xref>)</p>
</sec>
<sec sec-type="other3">
<title>Krvni tlak</title>
<p>Ve&#x0107;ina postmenopauzalnih &#x017E;ena boluje od arterijske hipertenzije. Poznato je da premenopauzalne &#x017E;ene imaju ni&#x017E;e vrijednosti krvnog tlaka u usporedbi s mu&#x0161;karcima iste dobi te da je raniji nastup menopauze povezan s ve&#x0107;im rizikom za razvoj arterijske hipertenzije. S endokrinolo&#x0161;ke strane, odnos izme&#x0111;u endogenih estrogena i krvnog tlaka jest kompleksan i uklju&#x010D;uje vi&#x0161;e genomskih i negenomskih utjecaja na vaskularni tonus i remodeliranje, interakciju s renin-angiotenzin sustavom, kao i kontrolu oksidativnog stresa. Me&#x0111;utim, zbog drugih predisponiraju&#x0107;ih &#x010D;imbenika kao &#x0161;to su debljina, arterijska krutost i inzulinska rezistencija, koji &#x010D;esto prate srednju &#x017E;ivotnu dob, sam doprinos menopauzalne hormonalne mijene u razvoju arterijske hipertenzije ostao je nerazja&#x0161;njen u presje&#x010D;nim studijama. Analiza longitudinalne studije SWAN, nakon desetogodi&#x0161;njeg pra&#x0107;enja, pokazala je da su promjene vrijednosti krvnog tlaka u menopauzalnoj tranziciji posljedica kronolo&#x0161;kog starenja i da nisu u relaciji s posljednjom menstruacijom. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) Sli&#x010D;ne rezultate iznjedrila je i <italic>Melbourne Midlife Health Project</italic> studija, u kojoj su promjene tlaka atribuirane dobi, indeksu tjelesne mase i promjenama u drugim &#x010D;imbenicima rizika. Studija <italic>Chin-Shan Community Cardiovascular Cohort</italic> tako&#x0111;er je pokazala da sistoli&#x010D;ki i dijastoli&#x010D;ki krvni tlak nisu pod utjecajem nastupa menopauze, &#x010D;ak &#x0161;tovi&#x0161;e, zabilje&#x017E;en je trend porasta sistoli&#x010D;kog tlaka u &#x017E;ena koje su dulje ostajale u premenopauzalnom periodu, dok dijastoli&#x010D;ki tlak nije bio u funkciji kako menopauze, tako ni dobi niti indeksa tjelesne mase. (<xref ref-type="bibr" rid="r14"><italic>14</italic></xref>)</p>
</sec>
<sec sec-type="other4">
<title>Homeostaza glukoze i inzulina</title>
<p>Kao ni s promjenama krvnog tlaka, kohortne studije nisu na&#x0161;le uzro&#x010D;nu povezanost nastupa menopauze niti s homeostazom glukoze i inzulina, odnosno s rizikom razvoja &#x0161;e&#x0107;erne bolesti. Tako u studiji <italic>Melbourne Midlife Health Project</italic> nisu prona&#x0111;ene razlike u bazalnim vrijednostima glukoze i inzulina u &#x017E;ena na prijelazu iz premenopauze ili rane perimenopauze u postmenopauzu, kao ni u &#x017E;ena koje su tijekom petogodi&#x0161;njeg pra&#x0107;enja ostale u premenopauzi ili postmenopauzi. (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>) Na iste rezultate upu&#x0107;uje i analiza studije SWAN, a menopauza kao &#x010D;imbenik rizika za razvoj dijabetesa nije detektirana niti u drugim longitudinalnim pra&#x0107;enjima &#x2013; trogodi&#x0161;njoj studiji <italic>Diabetes Prevention Program</italic>, &#x0161;estogodi&#x0161;njoj <italic>Pizzara study</italic>, te osmogodi&#x0161;njoj <italic>Australian Longitudinal Study on Women&#x2019;s Health</italic>. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>, <xref ref-type="bibr" rid="r22"><italic>22</italic></xref>&#x2013;<xref ref-type="bibr" rid="r24"><italic>24</italic></xref>) Podatci iz <italic>Healthy Women Study</italic> sugeriraju da su promjene u homeostazi glukoze vjerojatnije kroz pet godina nakon menopauze nego u perimenopauzalnom razdoblju, &#x0161;to je povezano s ve&#x0107;om proporcijom masnog tkiva u postmenopauzalnom razdoblju. S druge strane, zna&#x010D;ajan rizik za nastup dijabetesa na&#x0111;en je za kohortu &#x017E;ena s prijevremenim nastupom menopauze u velikoj <italic>InterAct</italic> studiji, gdje je kroz 11 godina pra&#x0107;enja vi&#x0161;e od 8.000 postmenopauzalnih &#x017E;ena zabilje&#x017E;en porast rizika od 32% u &#x017E;ena s prijevremenom menopauzom u odnosu na &#x017E;ene s nastupom menopauze u razdoblju od 50. do 54. godine &#x017E;ivota, i to nakon prilagodbe za dob, indeks tjelesne mase i druge poznate &#x010D;imbenike rizika za &#x0161;e&#x0107;ernu bolest. Isto tako, za nagli gubitak estrogena u primjeru kirur&#x0161;ke menopauze (bilateralne ooforektomije) u <italic>NHANES I Epidemiologic Follow-up Study</italic> uo&#x010D;en je porast rizika za nastup &#x0161;e&#x0107;erne bolesti od 57% u odnosu na &#x017E;ene s prirodnom menopauzom. (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>, <xref ref-type="bibr" rid="r26"><italic>26</italic></xref>)</p>
</sec>
<sec sec-type="other5">
<title>Debljina, rekompozicija tjelesne gra&#x0111;e i metaboli&#x010D;ki sindrom</title>
<p>Menopauzalna tranzicija prou&#x010D;avana u SWAN studiji tek je marginalno prediktivna za promjene indeksa tjelesne mase, ali svakako vi&#x0161;e prediktivna u slu&#x010D;aju kronolo&#x0161;ke dobi i ukupnog utjecaja fizi&#x010D;ke aktivnosti. (<xref ref-type="bibr" rid="r27"><italic>27</italic></xref>) Unato&#x010D; nepostojanju povezanosti kako ni s krvnim tlakom, razinama glukoze i inzulina, tako ni s indeksom tjelesne mase, menopauzalna tranzicija jasno je dovedena u vezu s metaboli&#x010D;kim sindromom koji je ina&#x010D;e odgovoran za udvostru&#x010D;enje kardiovaskularnog rizika i koji pove&#x0107;ava op&#x0107;i mortalitet za 50%. (<xref ref-type="bibr" rid="r28"><italic>28</italic></xref>) Upravo u perimenopauzi, prema studiji SWAN, izgledi za razvoj metaboli&#x010D;kog sindroma su najve&#x0107;i, neovisno o kronolo&#x0161;koj dobi i nakon prilagodbe za druge rizi&#x010D;ne &#x010D;imbenike. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) U istoj studiji nije na&#x0111;ena poveznica rizika za metaboli&#x010D;ki sindrom s promjenama u serumskim razinama estradiola (E<sub>2</sub>), niti ukupnog testosterona, ali su porast bioraspolo&#x017E;ivog testosterona ili pad globulina koji ve&#x017E;e spolne hormone (engl. <italic>sex hormone binding globulin</italic>, SHBG), bili podjednako povezani sa zna&#x010D;ajnim povi&#x0161;enjem rizika. Daljnje analize u ovoj kohorti pokazale su da porast omjera testosterona i E<sub>2</sub>, kao i brzina porasta tog omjera kroz menopauzalnu tranziciju, imaju ve&#x0107;i prediktivni zna&#x010D;aj za razvoj metaboli&#x010D;kog sindroma nego individualne promjene pojedinog hormona. Nadalje, sam odnos dinamike E<sub>2</sub> u perimenopauzi i debljine, longitudinalno pra&#x0107;en u studiji SWAN, kompleksan je i potencijalno dvosmjeran. Naime, inicijalno kod &#x017E;ena u premenopauzi ili ranoj perimenopauzi ustanovljen je inverzan odnos razine E<sub>2</sub> s indeksom tjelesne mase i opsegom struka. Daljnjim pra&#x0107;enjem ustanovljena je dvosmjerna relacija koja je u funkciji menopauzalnog statusa: ve&#x0107;i opseg struka &#x017E;ena u premenopauzi/ranoj perimenopauzi pokazao se prediktivan za ni&#x017E;e razine E<sub>2</sub> u predstoje&#x0107;em razdoblju. Suprotno tomu, kod &#x017E;ena u kasnoj perimenopauzi/postmenopauzi, ve&#x0107;i opseg struka nagovijestio je vi&#x0161;e razine E<sub>2</sub> u budu&#x0107;nosti. I tijekom rane i u kasnijim fazama tranzicije, razina E<sub>2</sub> bila je povezana s manjim opsegom struka u budu&#x0107;nosti. I dok se od budu&#x0107;ih istra&#x017E;ivanja o&#x010D;ekuje daljnje rasvjetljavanje zna&#x010D;aja ovih sekvencijalnih povezanosti, dana&#x0161;nje spoznaje upu&#x0107;uju na zaklju&#x010D;ak da su mehanizmi kojima se u menopauzalnoj tranziciji pove&#x0107;ava rizik vi&#x0161;e povezani s agregacijom svih komponenti metaboli&#x010D;kog sindroma nego s pogor&#x0161;anjem samo jedne komponente. Biolo&#x0161;ka plauzibilnost ovog zaklju&#x010D;ka jest fenomen uzrokovan promjenama u menopauzalnoj tranziciji, dakle neovisan je o kronolo&#x0161;koj dobi: u kohorti SWAN, oko dvije godine prije posljednje menstruacije, udvostru&#x010D;ena je brzina porasta mase ukupnog masnog tkiva, dok je udio bezmasne mase u opadanju. Ova zbivanja nastavljaju se do dvije godine nakon posljednje menstruacije, kada postupno dosti&#x017E;u svoj plato. Nadalje, u kasnom perimenopauzalnom i postmenopauzalnom razdoblju, u ancilarnoj studiji SWAN <italic>Cardiovascular Fat</italic> uo&#x010D;en je porast perikardijalne i parakardijalne akumulacije masti, neovisno o dobi, debljini i drugim varijablama, a &#x0161;to je, povrh visceralne akumulacije masti, povezano s porastom kardiovaskularnog rizika. Za ukupnu tjelesnu te&#x017E;inu, odnosno indeks tjelesne mase, u studiji SWAN utvr&#x0111;en je linearan rast kroz menopauzalnu tranziciju (0,25 kg, odnosno 0,12 kg/m<sup>2</sup> godi&#x0161;nje), koji se, kao i akumulacija masti, usporava dvije godine nakon posljednje menstruacije. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) I dok ovakvi rezultati potvr&#x0111;uju da indeks tjelesne mase nije odve&#x0107; koristan kardiometaboli&#x010D;ki marker u menopauzalnih &#x017E;ena, ovakva redistribucija tjelesne mase jasno predstavlja platformu za nastanak metaboli&#x010D;kog sindroma. (<xref ref-type="bibr" rid="r29"><italic>29</italic></xref>&#x2013;<xref ref-type="bibr" rid="r31"><italic>31</italic></xref>)</p>
</sec>
<sec sec-type="other6">
<title>Vazomotorni menopauzalni simptomi kao marker kardiovaskularnog rizika</title>
<p>U novije vrijeme istra&#x017E;ivan je zna&#x010D;aj tipi&#x010D;nih znakova menopauzalne tranzicije &#x2013; vru&#x0107;ih valova i no&#x0107;nih preznojavanja, tj. vazomotornih menopauzalnih simptoma (VMS), koji, s obzirom na to da se pojavljuju relativno rano, mogu predstavljati potencijal ranog prepoznavanja predstoje&#x0107;ih rizika. (<xref ref-type="bibr" rid="r32"><italic>32</italic></xref>) U relaciji prema drugim tradicionalnim &#x010D;imbenicima kardiovaskularnih rizika, studija SWAN je dokazala zna&#x010D;ajnu povezanost VMS-a s povi&#x0161;enim razinama LDL-a, triglicerida i ApoB, inzulinskom rezistencijom, te s ve&#x0107;im rizikom za razvoj arterijske hipertenzije, i to neovisno o dobi ili hormonskom statusu. Uz to, u studiji SWAN VMS je iskazan i kao marker za subklini&#x010D;ke promjene na krvnim &#x017E;ilama, opet neovisno o drugim kardiovaskularnim &#x010D;imbenicima rizika. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) Konkretno, &#x017E;ene s VMS-om imale su manje izra&#x017E;enu dilataciju posredovanu protokom i nagla&#x0161;eniju kalcifikaciju aorte, kao i ve&#x0107;e intimo-medijalno zadebljanje karotida, koje je, nakon 13 godina pra&#x0107;enja, osobito dovedeno u odnos s ranim nastupom VMS-a. Prognosti&#x010D;ki zna&#x010D;aj ranog nastupa VMS-a potvr&#x0111;uje i prospektivno istra&#x017E;ivanje koje je u mla&#x0111;ih (dobi 40&#x2013;53 godine), ali ne i u starijih &#x017E;ena (dobi 53&#x2013;60 godina), ustanovilo neovisnu povezanost prisutnosti i u&#x010D;estalosti VMS-a s naru&#x0161;enom endotelnom funkcijom, &#x0161;to je ilustrirano sni&#x017E;enim vrijednostima dilatacije uzrokovanim protokom (engl. <italic>flow mediated dilation</italic>, FMD) brahijalnih arterija, neovisno o drugim &#x010D;imbenicima rizika ili estrogenom statusu. U kontekstu oksidativnog stresa kao bitnog medijatora patogeneze kardiovaskularnih bolesti, talijanska presje&#x010D;na studija &#x017E;ena u ranoj menopauzi pokazala je linearan odnos izra&#x017E;enosti VMS-a i smanjenja antioksidativne obrane u krvi, neovisno o drugim metaboli&#x010D;kim i hormonskim parametrima, a uz korelaciju potonje s klini&#x010D;ki zna&#x010D;ajnim pove&#x0107;anjem otpora protoka mjerenog u karotidnim arterijama. Kona&#x010D;no, veliko kohortno istra&#x017E;ivanje <italic>Australian Longitudinal Study on Women&#x2019;s Health</italic>, gdje je 11.725 &#x017E;ena u dobi 45&#x2013;50 godina prospektivno pra&#x0107;eno kroz 14 godina, ustanovilo je vi&#x0161;e nego udvostru&#x010D;en rizik razvoja koronarne sr&#x010D;ane bolesti u &#x017E;ena koje su imale &#x010D;este VMS. Nakon prilagodbe za menopauzalni status, &#x010D;imbenike &#x017E;ivotnog stila, indeks tjelesne mase, &#x0161;e&#x0107;ernu bolest i arterijsku hipertenziju, rizik je ostao i dalje 70% ve&#x0107;i u &#x017E;ena s &#x010D;estim VMS u usporedbi sa &#x017E;enama koje nisu imale VMS. (<xref ref-type="bibr" rid="r33"><italic>33</italic></xref>, <xref ref-type="bibr" rid="r34"><italic>34</italic></xref>)</p>
<sec>
<title>Estrogeni u fiziologiji kardiovaskularnog sustava</title>
<p>Brojna istra&#x017E;ivanja dokazuju da je estrogenska protekcija krvo&#x017E;ilja i srca posljedica neposrednih u&#x010D;inaka estrogena na vazodilataciju, angiogenezu, unaprje&#x0111;enje mitohondrijalne funkcije i sni&#x017E;enje razine oksidativnog stresa te supresiju fibroze. (<xref ref-type="bibr" rid="r35"><italic>35</italic></xref>-<xref ref-type="bibr" rid="r37"><italic>37</italic></xref>) U&#x010D;inak na angiogenezu pokazan je na modelima sr&#x010D;anog zatajenja i ishemijske ozljede srca, gdje tretman estrogenima u ovarijektomiranih &#x017E;ivotinja poti&#x010D;e neovaskularizaciju receptorskim putem, poja&#x010D;avaju&#x0107;i ekspresiju VEGF-a (vaskularni endotelijalni &#x010D;imbenik rasta, od engl. <italic>vascular endothelial growth factor</italic>), &#x0161;to pokre&#x0107;e kaskadu sinteze eNOS-a, proliferaciju i migraciju prekursorskih stanica, te njihovu diferencijaciju u zrelo krvo&#x017E;ilje. (<xref ref-type="bibr" rid="r38"><italic>38</italic></xref>&#x2013;<xref ref-type="bibr" rid="r40"><italic>40</italic></xref>) Ovi u&#x010D;inci pokazali su se klju&#x010D;nim za prezervaciju sr&#x010D;ane funkcije nakon infarkta miokarda, kao i za sprje&#x010D;avanje progresije sr&#x010D;ane hipertrofije prema sr&#x010D;anom zatajenju. Niz istra&#x017E;ivanja pokazao je da estrogeni imaju zna&#x010D;ajne za&#x0161;titne u&#x010D;inke na strukturu i biogenezu mitohondrija, posredovane kako tradicionalnim, nuklearnim, tako i receptorima spregnutim s plazmatskom membranom. Tako je, primjerice, na mi&#x0161;evima ER&#x03B1; &#x2018;<italic>knockout</italic>&#x2019; (ERKO) dokazan usporen funkcionalni oporavak nakon globalne miokardijalne ishemijsko-reperfuzijske ozljede, s ve&#x0107;im podru&#x010D;jima infarkta, uz istovremeno fragmentirane mitohondrije s gubitkom matriksa te zna&#x010D;ajno naru&#x0161;enom respiratornom mitohondrijalnom funkcijom u usporedbi s &#x201E;<italic>wild-type</italic>&#x201D; &#x017E;ivotinjama. Isto tako, kardioprotekcija estrogenima prilikom ishemijsko-reperfuzijske nokse dokazana je i preko aktivacije GPR30 na membrani mitohondrija, &#x010D;ime se preko kaskada kinaza reguliranih izvanstani&#x010D;nim signalom i MAPK-kaskada mobilizira unutarstani&#x010D;ni kalcij i prije&#x010D;i otvaranje prijenosne pore permeabilnosti mitohondrija s nastupom reperfuzije, a &#x0161;to ina&#x010D;e redovito vodi u apoptozu ili nekrozu. Ovaj mehanizam je u skladu s opservacijom da ovariektomirane &#x017E;ivotinje imaju sni&#x017E;en kapacitet retencije kalcijevih iona u mitohondriju, koji se oporavlja nakon ponovnog izlaganja estradiolu. Jednako tako, u ovariektomiranih &#x017E;ivotinja zabilje&#x017E;ene su zna&#x010D;ajne promjene u proteinima oksidativne fosforilacije, uklju&#x010D;uju&#x0107;i citokrom c-oksidazu i adenozin trifosfat (ATP) sintetazu, &#x0161;to posljedi&#x010D;no vodi slabljenju i kona&#x010D;nom slomu funkcije mitohondrija u sr&#x010D;anim stanicama. (<xref ref-type="bibr" rid="r41"><italic>41</italic></xref>&#x2013;<xref ref-type="bibr" rid="r45"><italic>45</italic></xref>)</p>
</sec>
</sec>
<sec sec-type="other7">
<title>Neizravni fiziolo&#x0161;ki u&#x010D;inci estrogena na kardiovaskularnu homeostazu i progresiju ateroskleroze</title>
<p>Uloga estrogena u o&#x010D;uvanju kardiovaskularnog zdravlja, uza sve gore opisane izravne u&#x010D;inke na srce i krvne &#x017E;ile, uklju&#x010D;uje i estrogenske mehanizme kojima su regulirani lipidni profil, inzulinska osjetljivost te monocitno-makrofagni sustav, a &#x010D;iji ispadi funkcije doprinose multifaktorijalnom procesu ateroskleroze i u znatnoj mjeri moduliraju kardiovaskularni rizik. (<xref ref-type="bibr" rid="r46"><italic>46</italic></xref>&#x2013;<xref ref-type="bibr" rid="r49"><italic>49</italic></xref>)</p>
<sec>
<title>U&#x010D;inci na lipidni profil i inzulinsku osjetljivost</title>
<p>Niz bazi&#x010D;nih i klini&#x010D;kih istra&#x017E;ivanja jasno je naglasio va&#x017E;nost dislipidemije i inzulinske rezistencije u modulaciji kardiovaskularnog rizika, &#x0161;to je u kona&#x010D;nici i razlog njihovoga logi&#x010D;nog zdru&#x017E;ivanja s arterijskom hipertenzijom i debljinom u jedinstveni klini&#x010D;ki entitet &#x2013; metaboli&#x010D;ki sindrom. (<xref ref-type="bibr" rid="r50"><italic>50</italic></xref>) Jedan od klju&#x010D;nih fiziolo&#x0161;kih mehanizama za&#x0161;tite od ateroskleroze jest povratni prijenos kolesterola, kojim se kolesterol s periferije transportira natrag na mjesto sinteze &#x2013; u jetru, s ciljem eliminacije iz organizma. Odatle potje&#x010D;e antiaterogena uloga HDL-a, koji potencira efluks kolesterola iz pjenastih stanica i tako prevenira nakupljanje lipida u arterijskom zidu. Recentna istra&#x017E;ivanja demonstrirala su fiziolo&#x0161;ku ulogu estrogenskih u&#x010D;inaka u jetri kojima je regulirano efikasno preuzimanje kolesterola i kolesteril-estera, i njihovo izlu&#x010D;ivanje u &#x017E;u&#x010D;, odnosno eliminaciju fecesom. Konkretno, delecija ER&#x03B1; u hepatocitima smanjuje efluksni kapacitet HDL-a, a &#x0161;to je <italic>in vivo</italic> popra&#x0107;eno povi&#x0161;enjem razine serumskog kolesterola, porastom veli&#x010D;ine HDL-&#x010D;estica te vi&#x0161;e nego peterostrukim porastom veli&#x010D;ine aterosklerotske lezije.</p>
</sec>
<sec>
<title>Hormonsko nadomjesno lije&#x010D;enje (HNL) i modulacija kardiovaskularnih rizika</title>
<p>Modulacija kardiovaskularnih rizika iznimno je va&#x017E;an i aktualan aspekt u primjeni HNL-a, osobito u kontekstu spoznaje da se klini&#x010D;ka prezentacija, patofiziologija i prognoza kardiovaskularnih bolesti razlikuju izme&#x0111;u spolova, a takav spolni dimorfizam prije svega je posredovan razli&#x010D;itom fiziologijom spolnih hormona u mu&#x0161;karaca i &#x017E;ena. (<xref ref-type="bibr" rid="r51"><italic>51</italic></xref>)</p>
</sec>
</sec>
<sec sec-type="other8">
<title>Suvremene spoznaje o HNL-u &#x2013; potencijal primarne kardiovaskularne prevencije</title>
<p>Iz dana&#x0161;nje je perspektive jasno da je nagli pad kori&#x0161;tenja HNL-a u post-WHI eri ostavio veliki broj &#x017E;ena s tegobama i rizicima menopauze zanemarenim, dovode&#x0107;i do nepotrebne fragmentacije zdravstvene skrbi i prije svega do nepotrebnog porasta morbiditeta/mortaliteta &#x017E;ena u menopauzi. U kontekstu kardiovaskularnih ishoda, engleska ekolo&#x0161;ka studija potvrdila je nepovoljan trend u incidenciji mo&#x017E;danog i sr&#x010D;anog udara u razdoblju nakon objave rezultata WHI studije. (<xref ref-type="bibr" rid="r52"><italic>52</italic></xref>, <xref ref-type="bibr" rid="r53"><italic>53</italic></xref>) Ove su opservacije u skladu s rezultatima finske studije u kojoj je na&#x0111;ena ve&#x0107;a smrtnost od mo&#x017E;danog i sr&#x010D;anog udara u &#x017E;ena koje prekinu primjenu HNL-a, osobito u skupini &#x017E;ena mla&#x0111;ih od 60 godina. Kona&#x010D;no, studija Sarrela i suradnika sa sveu&#x010D;ili&#x0161;ta Yale procjenjuje da je samo na prostoru Sjedinjenih Ameri&#x010D;kih Dr&#x017E;ava izme&#x0111;u 2002. i 2012. vi&#x0161;e od 50.000 smrti &#x017E;ena direktna posljedica izostavljanja HNL-a. Prije skoro deset godina objavljeni su rezultati studije WHI nakon 13 godina kumulativnog pra&#x0107;enja (intervencijska + postintervencijska faza), prema kojima ni za ukupnu WHI-populaciju &#x017E;ena, dakle netipi&#x010D;no stariju i s vi&#x0161;e komorbiditeta, ni u jednoj grani studije nije pokazano zna&#x010D;ajno povi&#x0161;enje rizika za koronarnu sr&#x010D;anu bolest. Kona&#x010D;no, nakon 18 godina pra&#x0107;enja, 2017. godine, ustanovljeno je da primjena HNL-a (E+P ili E, u trajanju 5,6 odnosno 7,2 godine) u cjelokupnoj postmenopauzalnoj WHI-populaciji nema povezanosti niti s kardiovaskularnim niti s op&#x0107;im mortalitetom, kao niti s mortalitetom od karcinoma. (<xref ref-type="bibr" rid="r53"><italic>53</italic></xref>) Iako je u znanstvenoj javnosti isprovocirala brojne kontroverze, upravo je studija WHI dala bitne znanstvene doprinose koji su ugra&#x0111;eni u temelj suvremenog pristupa HNL-u. U prvom redu, to je tzv. &#x201E;prozor za priliku&#x201D; (engl. <italic>&#x201E;window of opportunity</italic>&#x201D;) ili tzv. &#x201E;<italic>timing</italic>&#x201D; hipoteza. Naime, spomenuta analiza WHI studije nakon 13 godina pra&#x0107;enja iznova je potvrdila va&#x017E;nost dobne stratifikacije u interpretaciji rezultata, tj. dokazan je jasan potencijal kardiovaskularne prevencije u dobnoj skupini 50&#x2013;59 godina. Konkretno, u E grani studije rizik za koronarnu sr&#x010D;anu bolest sni&#x017E;en je za 35%, a za miokardijalni infarkt za 40%, dok je globalni indeks sni&#x017E;en za 18%. Sli&#x010D;an u&#x010D;inak kardioprotekcije pokazan je u <italic>Danish Osteoporosis Prevention Study</italic> (DOPS), gdje su mla&#x0111;e &#x017E;ene (dobi 45&#x2013;58 godina) na terapiji standardnim dozama estradiola i noretisterona u trajanju deset godina i daljnjem pra&#x0107;enju do 16 godina imale zna&#x010D;ajno ni&#x017E;i mortalitet i manju u&#x010D;estalost infarkta miokarda i sr&#x010D;anog zatajenja. (<xref ref-type="bibr" rid="r54"><italic>54</italic></xref>) U skladu s tim, velika Cochraneova metaanaliza 19 randomiziranih studija s ukupno uklju&#x010D;enih 40.410 &#x017E;ena pokazala je da &#x017E;ene koje zapo&#x010D;inju HNL u razdoblju do deset godina od nastupa menopauze imaju rizik kardiovaskularnog mortaliteta sni&#x017E;en za 48%, a op&#x0107;eg za 30%. (<xref ref-type="bibr" rid="r55"><italic>55</italic></xref>) Istovremeno, u istoj skupini &#x017E;ena, za prethodno insinuirani rizik mo&#x017E;danog udara nije izna&#x0111;eno zna&#x010D;ajno povi&#x0161;enje rizika. Trendovi koronarne sr&#x010D;ane bolesti uo&#x010D;eni u dobno stratificiranim analizama ukazuju na dobno ovisnu patofiziologiju nastanka aterosklerotskog plaka uz HNL. Konkretno, radi se o tome da estrogeni na krvo&#x017E;ilje imaju direktne (produkcija nitri&#x010D;nog oksida, prostaciklina) i indirektne (sni&#x017E;avanje ukupnog kolesterola i LDL-a, povi&#x0161;enje HDL-a) antiaterogene u&#x010D;inke. No, u slu&#x010D;aju ve&#x0107; uznapredovale ateroskleroze (karakteristi&#x010D;ne za stariju dob), estrogeni mogu, poti&#x010D;u&#x0107;i ekspresiju matriks-metaloproteinaze na makrofagima i poti&#x010D;u&#x0107;i neovaskularizaciju, stimulirati rupturu aterosklerotskog plaka, trombogenezu i kona&#x010D;no vaskularni incident poput infarkta miokarda. U skladu s tim uo&#x010D;en je fenomen vi&#x0161;eg rizika za nastup kardiovaskularnih incidenata u prvoj godini kori&#x0161;tenja HNL-a, poglavito u starijoj populaciji, a koji je u studiji WHI iznosio 1,81, u HERS 1,52, a u <italic>Nurses&#x2019; Health Study</italic> 1,25. (<xref ref-type="bibr" rid="r56"><italic>56</italic></xref>, <xref ref-type="bibr" rid="r57"><italic>57</italic></xref>) Isti rizik je s godinama terapije u bitnom opadanju, &#x0161;to dakle etiopatogenetski prije svega sugerira akutni efekt destabilizacije plaka, a ne ubrzan nastanak novih aterogenih lezija uz HNL. Konceptom <italic>&#x201E;Window of opportunity</italic>&#x201D; obja&#x0161;njeni su neo&#x010D;ekivani inicijalni rezultati WHI studije i istovremeno je aktualiziran potencijal primarne kardiovaskularne prevencije s HNL-om. Potvrdu ovog koncepta donijela je i recentna randomizirana studija <italic>Early versus Late Intervention Trial with Estradiol</italic> (ELITE), koja je uspore&#x0111;ivala u&#x010D;inak oralne terapije estradiolom (1 mg dnevno) u kombinaciji s vaginalnim mikroniziranim progesteronom na intimo-medijalno zadebljanje karotida &#x017E;ena koje su unutar &#x0161;est ili vi&#x0161;e od deset godina nakon menopauze. (<xref ref-type="bibr" rid="r58"><italic>58</italic></xref>) Nakon petogodi&#x0161;njeg prospektivnog pra&#x0107;enja demonstriran je jasan efekt inhibicije progresije ateroskleroze u mla&#x0111;oj, ali ne i u starijoj skupini ispitanica.</p>
<p>U kontekstu procjene rizika i dobrobiti u strategijama primarne kardiovaskularne prevencije, napose prevencije koronarne sr&#x010D;ane bolesti, uz prethodno spomenutu zabludu da je magnituda rizika uz HNL zna&#x010D;ajna &#x010D;esto je prisutna i druga zabluda da su postoje&#x0107;i rizici isklju&#x010D;ivo vezani uz HNL te da ih drugi lijekovi nemaju. Ove zablude demantiraju analize danas ve&#x0107; zna&#x010D;ajnog broja randomiziranih studija koje jasno ukazuju da su rizici svih preparata i lijekova impliciranih u primarnoj prevenciji koronarne sr&#x010D;ane bolesti u &#x017E;ena sli&#x010D;ni i po tipu i po magnitudi, a ve&#x0107;ina njih kategorizirana je kao manje u&#x010D;estali (&lt;1 incident na 100 lije&#x010D;enih &#x017E;ena) rizici. Rizici HNL-a su predominantno rijetki (&lt;1 incident na 1.000 lije&#x010D;enih &#x017E;ena), a nikako ve&#x0107;i od drugih lijekova, poput acetilsalicilne kiseline ili statina. U tom svjetlu, valja se podsjetiti da naj&#x010D;e&#x0161;&#x0107;i incidenti uz oralnu primjenu HNL-a &#x2013; venske tromboembolije &#x2013; prema rezultatima studije WHI imaju apsolutni rizik od 18 (E+P grana), odnosno 7 (E grana) dodatnih slu&#x010D;ajeva na 10.000 &#x017E;ena godi&#x0161;nje, dok je u populaciji &#x017E;ena mla&#x0111;ih od 60 godina taj rizik bitno manji i iznosi 11 (E+P grana), odnosno 4 (E grana) dodatna slu&#x010D;aja na 10.000 &#x017E;enskih godina. U &#x017E;ena mla&#x0111;ih od 60 godina u studiji WHI uz HNL bilo je &#x0161;est (E+P grana), odnosno &#x010D;etiri (E grana) dodatna slu&#x010D;aja plu&#x0107;ne embolije, dok terapija fenofibratom donosi devet dodatnih slu&#x010D;ajeva na 10.000 lije&#x010D;enih godi&#x0161;nje. Svi ovi rizici manji su od rizika za tromboembolije u trudno&#x0107;i. Nadalje, razlog prekida E grane u studiji WHI &#x2013; rizik za mo&#x017E;dani udar, ina&#x010D;e u mla&#x0111;ih &#x017E;ena bezna&#x010D;ajan, i dalje je u postmenopauzalnih &#x017E;ena manji uz HNL nego, primjerice, uz suplementaciju kalcija, uz koju na 10.000 &#x017E;ena postoji 36 dodatnih slu&#x010D;ajeva mo&#x017E;danog udara godi&#x0161;nje. Acetilsalicilna kiselina smanjuje incidenciju ishemi&#x010D;noga mo&#x017E;danog udara u &#x017E;ena bez prethodne cerebrovaskularne bolesti za 24%, no istovremeno, rizik za hemoragi&#x010D;ni mo&#x017E;dani udar uz ovu terapiju raste za 24%. Suprotno tomu, u studiji WHI dokazano je smanjenje rizika za hemoragi&#x010D;ni mo&#x017E;dani udar za 18% (E+P grana) odnosno za 36% (E grana). U studijama sekundarne prevencije porast rizika za hemoragi&#x010D;ni mo&#x017E;dani udar na&#x0111;en je i uz terapiju statinima, a koja dodatno nosi i ve&#x0107;i rizik od razvoja &#x0161;e&#x0107;erne bolesti, osobito u &#x017E;enskoj populaciji. Nasuprot, primjena HNL-a, prema podatcima iz studije WHI, povezana je s 15 (E+P grana), odnosno 14 (E grana) slu&#x010D;ajeva dijabetesa manje na 10.000 &#x017E;ena godi&#x0161;nje. Velika metaanaliza 107 randomiziranih studija potvrdila je uz HNL redukciju incidencije dijabetesa za 30%. Ina&#x010D;e, tiazolidindioni u terapiji &#x0161;e&#x0107;erne bolesti pove&#x0107;avaju rizik za frakturu kosti, tako&#x0111;er specifi&#x010D;no u &#x017E;enskoj populaciji, a koja je bez HNL-a ionako pod ve&#x0107;im rizikom osteoporoti&#x010D;nih fraktura. S druge strane, bisfosfonati koji se koriste u lije&#x010D;enju osteoporoze pove&#x0107;avaju rizik od atrijske fibrilacije za 26 dodatnih slu&#x010D;ajeva na 10.000 godina kori&#x0161;tenja, &#x0161;to je rizik ve&#x0107;i od bilo kojeg rizika povezanog s HNL-om. Kona&#x010D;no, treba naglasiti da, prema raspolo&#x017E;ivim analizama, konvencionalne strategije primarne prevencije koronarne sr&#x010D;ane bolesti pokazuju manju u&#x010D;inkovitost u &#x017E;enskoj nego u mu&#x0161;koj populaciji. (<xref ref-type="bibr" rid="r59"><italic>59</italic></xref>, <xref ref-type="bibr" rid="r60"><italic>60</italic></xref>)</p>
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<title>Optimizacija HNL-a u kontekstu kardiovaskularnog profila rizika</title>
<p>Prema posljednjim smjernicama Me&#x0111;unarodnog dru&#x0161;tva za menopauzu (<italic>International Menopause Society</italic>, IMS), a koje je preuzelo i Hrvatsko dru&#x0161;tvo za menopauzu, HNL je sastavni dio cjelovite strategije za skrb o zdravlju &#x017E;ena u peri-/postmenopauzi, koja uklju&#x010D;uje savjetovanje o promjenama &#x017E;ivotnih navika, tj. pravilnoj prehrani, tjelovje&#x017E;bi, prestanku pu&#x0161;enja i izbjegavanju prekomjernog unosa alkohola i kontroli pretilosti (ITM&lt;30 kg/m<sup>2</sup>). (<xref ref-type="bibr" rid="r61"><italic>61</italic></xref>) Terapijski pristup &#x017E;enama u menopauzalnoj tranziciji istovremeno ima za cilj rje&#x0161;avanje menopauzalnih tegoba/simptoma, ali i dugoro&#x010D;no o&#x010D;uvanje zdravlja. S obzirom na to da se relativna va&#x017E;nost pojedinih ciljeva dinami&#x010D;ki mijenja kroz menopauzalnu tranziciju, terapijski pristup mora biti personaliziran. Odabir HNL-a stoga treba biti individualiziran prema simptomima i cilju prevencije. Pritom, dakako, treba imati na umu da se rizici i dobrobiti primjene HNL-a razlikuju me&#x0111;u &#x017E;enama, a jedna od klju&#x010D;nih odrednica u modulaciji rizika i dobrobiti jest dob &#x017E;ene. Uvo&#x0111;enje HNL-a u dobi izme&#x0111;u 50. i 60. godine &#x017E;ivota, odnosno unutar deset godina nakon menopauze na&#x010D;elno se smatra optimalnim jer u tom vremenskom prozoru dobrobiti nadma&#x0161;uju, gotovo u cijelosti, potencijalne rizike primjene HNL-a. Osobito je va&#x017E;no imati u vidu kardioprotektivne u&#x010D;inke koji se ve&#x017E;u uz pravovremeni po&#x010D;etak HNL-a, a koji se ogledaju u reduciranom kardiovaskularnom i op&#x0107;em mortalitetu. S druge strane, uvo&#x0111;enje HNL-a nakon 60. godine &#x017E;ivota isklju&#x010D;ivo u svrhu primarne prevencije koronarne bolesti nije preporu&#x010D;ljivo. Postoje&#x0107;i rizi&#x010D;ni &#x010D;imbenici, napose kardiovaskularni, svakako zaslu&#x017E;uju posebnu pa&#x017E;nju u procjeni dobrobiti i rizika uvo&#x0111;enja HNL-a, no nikako ne predstavljaju nezaobilaznu prepreku za HNL. S kardiovaskularnog aspekta, apsolutnu kontraindikaciju predstavljaju akutno tromboembolijsko zbivanje i akutna faza miokardijalnog infarkta. Ostalim kardiovaskularnim rizicima treba pristupiti uz adekvatan anga&#x017E;man same korisnice HNL-a, koja treba preuzeti odgovornost za intervencije u &#x017E;ivotnom stilu koje &#x0107;e minimalizirati budu&#x0107;i rizik (pu&#x0161;enje, debljina, fizi&#x010D;ka aktivnost itd.), te uz razmatranje eventualnih konkomitantnih terapijskih intervencija, kroz interdisciplinarnu konzultaciju relevantnih specijalista. U svrhu procjene kardiovaskularnog rizika, povrh klini&#x010D;kog iskustva, poslu&#x017E;iti mogu sustavi izra&#x010D;una desetogodi&#x0161;njeg rizika za razvoj kardiovaskularne bolesti. U posljednje vrijeme zagovara se, temeljem ovih kalkulacija, izra&#x010D;un kardiovaskularne dobi, &#x010D;ime bi se omogu&#x0107;ila razumljivija percepcija rizika, pa bi tako desetogodi&#x0161;nji rizik od 12% za &#x017E;enu u kronolo&#x0161;koj dobi od 50 godina korespondirao kardiovaskularnoj dobi 70&#x2013;79 godina, dok bi rizik od 2% za &#x017E;enu u dobi od 65 godina odgovarao za kardiovaskularnu dob 40&#x2013;49 godina. Ovaj koncept, predlo&#x017E;en od R. Santena za procjenu rizika uz HNL, a koji je ina&#x010D;e prethodno prihvatilo i Kanadsko kardiovaskularno dru&#x0161;tvo (engl. <italic>Canadian Cardiovascular Society</italic>), mogao bi unaprijediti procjenu individualnoga kardiovaskularnog rizika uz HNL, odnosno omogu&#x0107;iti efikasnije o&#x010D;uvanje kardiovaskularnog zdravlja &#x017E;ene. Nedavne preporuke Endokrinolo&#x0161;kog dru&#x0161;tva (<italic>Endocrine Society</italic>) i algoritam koji je 2015. predstavilo Sjevernoameri&#x010D;ko dru&#x0161;tvo za menopauzu (<italic>North American Menopause Society</italic>, NAMS) preporu&#x010D;uju probir na kardiovaskularne bolesti prije uvo&#x0111;enja HNL-a kako bi se lije&#x010D;enje moglo optimizirati, tj. primijeniti uz minimalne rizike. (<xref ref-type="bibr" rid="r62"><italic>62</italic></xref>, <xref ref-type="bibr" rid="r63"><italic>63</italic></xref>) Koriste&#x0107;i izra&#x010D;un prema <italic>American College of Cardiology/American Heart Association</italic>, &#x017E;ene s umjerenim rizikom (izgledi za razvoj kardiovaskularne bolesti od 5&#x2013;10% u sljede&#x0107;ih deset godina), trebale bi koristiti transdermalnu terapiju, a one s rizikom preko 10% izbjegavati HNL. (<xref ref-type="bibr" rid="r64"><italic>64</italic></xref>) Preporuke za kori&#x0161;tenje transdermalnih estrogena u rizi&#x010D;nijih, napose pretilih pacijentica, uvr&#x0161;tene su i u posljednje smjernice IMS i NICE (od engl. <italic>National Institute of Health and Care Excellence</italic>), posljedi&#x010D;no rastu&#x0107;e objavljenim dokazima da je transdermalni put primjene E<sub>2</sub> u vi&#x0161;e aspekata povezan s ni&#x017E;im rizikom od kardiovaskularnih komplikacija. Naime, kod peroralne primjene E<sub>2</sub>, zbog dobro poznatog u&#x010D;inka prvog prolaska kroz jetru, stimulira se koagulacijska kaskada s posljedi&#x010D;nim pove&#x0107;anjem rizika za tromboemboliju. Dodatno, jetreni metabolizam estrogena povezan je s povi&#x0161;enjem triglicerida, &#x010D;ija razina ionako raste u doba menopauze, kao i s povi&#x0161;enjem markera upale &#x2013; u prvom redu CRP-a (sna&#x017E;nog prediktora kardiovaskularnog rizika u zdravih postmenopauzalnih &#x017E;ena) i matriks-metaloproteinaze. <italic>EStrogen and THromboEmbolism Risk</italic> (ESTHER) i britanske studije na istra&#x017E;iva&#x010D;koj bazi podataka obiteljske medicine (engl. <italic>General Practice Research Database</italic>, GPRD) potvrdile su da transdermalna primjena estradiola, i to neovisno o dozi, ne pove&#x0107;ava rizik niti u pretilih &#x017E;ena, koje uz peroralnu primjenu, zbog sinergisti&#x010D;kog efekta debljine i stimulacije koagulacijske kaskade u jetri, imaju deset puta ve&#x0107;i rizik od tromboembolija. (<xref ref-type="bibr" rid="r65"><italic>65</italic></xref>) Daljnja istra&#x017E;ivanja na kohorti &#x017E;ena studije ESTHER pokazala su da uz transdermalnu primjenu HNL-a rizik od tromboembolije nije promijenjen niti u &#x017E;ena s nasljednim trombofilijama. (<xref ref-type="bibr" rid="r66"><italic>66</italic></xref>) Uspore&#x0111;uju&#x0107;i u&#x010D;inke oralne terapije s CEE (0,45 mg dnevno) i transdermalno primijenjenog estradiola (50 &#x03BC;g dnevno) u kombinaciji s cikli&#x010D;ki ordiniranim progesteronom u trajanju &#x010D;etiri godine, randomizirano istra&#x017E;ivanje <italic>Kronos Early Estrogen Prevention Study</italic> (KEEPS) na zdravim &#x017E;enama dobi 42&#x2013;58 godina nije prona&#x0161;la zna&#x010D;ajne razlike u intimo-medijalnoj debljini karotida, uz tek nezna&#x010D;ajan trend redukcije udjela kalcija u koronarnim &#x017E;ilama. (<xref ref-type="bibr" rid="r67"><italic>67</italic></xref>) Me&#x0111;utim, studija nije imala dovoljnu snagu detektirati razlike u kardiovaskularnim ishodima, odnosno mogu&#x0107;e je da su u razdoblju od &#x010D;etiri godine ove zdrave &#x017E;ene imale premalu progresiju ateroskleroze da bi se uo&#x010D;ila razlika me&#x0111;u terapijskim skupinama.</p>
<p>Promatraju&#x0107;i sve znanstvene spoznaje o utjecajima HNL-a na profil kardiovaskularnog rizika, bitno je imati u vidu &#x010D;injenicu da su se kroz desetlje&#x0107;a razvoja HNL-a bitno pro&#x0161;irile mogu&#x0107;nosti optimizacije i individualizacije terapije, a time i dodatno reducirali potencijalni rizici. Uz spomenuti transdermalni put primjene razvijeni su i u&#x010D;inkoviti re&#x017E;imi terapije s niskim i ultraniskim dozama hormona. Kao progestagenska komponenta HNL-a, nu&#x017E;na za prevenciju karcinoma endometrija u &#x017E;ena s maternicom, u WHI i mnogim drugim ranijim studijama kori&#x0161;ten je MPA, sintetski gestagen sa zna&#x010D;ajnim androgenim i glukokortikoidnim svojstvima, odgovornim za povi&#x0161;enu ekspresiju trombina, vazospazam, inzulinsku rezistenciju, dislipidemiju i progresiju ateroskleroze. Ovakvo suprotstavljanje protektivnim estrogenim u&#x010D;incima nije uo&#x010D;eno uz primjenu prirodnoga mikroniziranog progesterona i didrogesterona, uz napomenu da prirodni progesteron ima i specifi&#x010D;an antihipertenzivni u&#x010D;inak, &#x0161;to dodatno opravdava njegovo kori&#x0161;tenje u cilju optimizacije kardiovaskularnog rizika.</p>
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<sec sec-type="other10">
<title>Zaklju&#x010D;ak</title>
<p>Brojna istra&#x017E;ivanja su pokazala da je menopauza va&#x017E;an &#x010D;imbenik koji doprinosi pove&#x0107;anju kardiovaskularnog rizika u &#x017E;ena. Dokazano je da je estrogenski protektivni u&#x010D;inak posljedica neposrednog u&#x010D;inka estrogena na vazodilataciju, angiogenezu, unaprje&#x0111;enje mitohondrijalne funkcije i sni&#x017E;enje razine oksidativnog stresa te supresiju fibroze. Promatraju&#x0107;i sve znanstvene spoznaje o utjecajima HNL-a na profil kardiovaskularnog rizika, bitno je znati da je razvoj HNL-a zna&#x010D;ajno pro&#x0161;irio mogu&#x0107;nost optimizacije i individualizacije terapije, a time su dodatno reducirani potencijalni rizici njegove primjene. Uz transdermalni put primjene, terapijske re&#x017E;ime s niskim i ultraniskim dozama hormona te primjenu prirodnog mikroniziranog progesterona i didrogesterona, kardiovaskularno zdravlje &#x017E;ena u menopauzi mo&#x017E;e biti zna&#x010D;ajno unaprije&#x0111;eno. Po&#x010D;etkom primjene HNL-a u menopauzalnoj tranziciji mo&#x017E;emo o&#x010D;ekivati kardiovaskularni benefit kod &#x017E;ena. Imaju&#x0107;i to u vidu, logi&#x010D;na je preporuka svih relevantnih klini&#x010D;kih smjernica da se polica propisivanja HNL-a mora mijenjati, s ciljem proaktivnog djelovanja na menopauzalno zdravlje &#x017E;ene.</p>
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