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<article article-type="research-article" xml:lang="hr" dtd-version="1.1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
  <front>
    <journal-meta>
      <journal-id/>
      <journal-title-group>
        <journal-title xml:lang="la">Medicus</journal-title>
      </journal-title-group>
      <issn pub-type="ppub">1330-013X</issn>
      <issn pub-type="epub">1848-8315</issn>
      <publisher>
        <publisher-name xml:lang="hr">PLIVA HRVATSKA d.o.o.</publisher-name>
        <publisher-name xml:lang="en">PLIVA CROATIA d.o.o.</publisher-name>
        <publisher-loc>Prilaz baruna Filipovića 25, Zagreb
          <email xlink:href="ivana.klinar@pliva.com">ivana.klinar@pliva.com</email>
          <ext-link xlink:href="http://www.plivamed.net/knjiznica/medicus">http://www.plivamed.net/knjiznica/medicus</ext-link>
        </publisher-loc>
      </publisher>
    </journal-meta>
    
    <article-meta>
      <article-categories>
        <subj-group subj-group-type="heading" xml:lang="hr">
          <subject> Pregledni rad </subject>
        </subj-group>
        <subj-group subj-group-type="heading" xml:lang="en">
          <subject> Review article </subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="hr">ACE-inhibitori: liječenje hipertenzije, organoprotekcija i mjere opreza</article-title>
        <trans-title-group>
          <trans-title xml:lang="en">ACE Inhibitors: Hypertension Treatment, Organoprotection and Precautionary Measures</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author" corresp="yes">
          <name>
            <surname>ČULIĆ</surname>
            <given-names>VIKTOR</given-names>
          </name>
          <xref ref-type="corresp" rid="cor1"/>
            <xref ref-type="aff" rid="aff1">1</xref>
            <xref ref-type="aff" rid="aff2">2</xref>
        </contrib>
       
        <aff id="aff1">
          <label>1</label>
          <institution xml:lang="hr">Klinika za bolesti srca i krvnih žila, Klinički bolnički centar Split</institution>
          <addr-line>Split, Hrvatska</addr-line>
        </aff>
        <aff id="aff2">
          <label>2</label>
          <institution xml:lang="hr">Medicinski fakultet Sveučilišta u Splitu</institution>
          <addr-line>Split, Hrvatska</addr-line>
        </aff>
      </contrib-group>
      <author-notes>
        <corresp id="cor1">
          ADRESA ZA DOPISIVANJE:
          Prof. dr. sc. Viktor Čulić, dr. med.
          Klinika za bolesti srca i krvnih žila
          Klinički bolnički centar Split – Križine
          Šoltanska 1
          21000 Split, Hrvatska
          e-mail: 
          <email xlink:href="viktor.culic@st.t-com.hr">viktor.culic@st.t-com.hr</email>
        </corresp>
      </author-notes>
      
      <pub-date>
        <month>11</month>
        <year>2016</year>
      </pub-date>
      <volume>25</volume>
      <issue>2</issue>
      <fpage>127</fpage>
      <lpage>137</lpage>
      <history>
        <date date-type="received">
          <day>23</day>
          <month>09</month>
          <year>2016</year>
        </date>
        <date date-type="accepted">
          <day>26</day>
          <month>09</month>
          <year>2016</year>
        </date>
      </history>
      
      <permissions>
        <license license-type="open-access">
          <license-p>CC BY-NC</license-p>
        </license>
      </permissions>
      <abstract xml:lang="hr">
        <p>Suprimirajući renin-angiotenzin-aldosteronski sustav (RAAS), inhibitori enzima koji konvertira angiotenzin (prema engl. angiotensin-converting-enzyme – ACE) imaju posebno značenje u liječenju esencijalne hipertenzije. ACE-inhibitori snižavaju arterijski tlak smanjujući periferni vaskularni otpor bez kompenzacijskog povišenja srčane frekvencije, promjene osjetljivosti baroreceptora ili pojave refleksne tahikardije. Istraživanja pokazuju da ACE-inhibitori mogu spriječiti i zaustaviti oštećenja ciljnih organa poput hipertrofije lijeve klijetke. Usporavanje oksidacije LDL-čestica, kao i smanjivanje krvožilnog oksidativnog stresa, proliferacije i hipertrofije glatkih mišićnih stanica te tromboembolijskih procesa povezuje se s usporavanjem napredovanja ateroskleroze. Spomenutim mehanizmima objašnjavaju se učinci ACE-inhibitora u smislu smanjenja ukupne i kardiovaskularne smrtnosti te opasnosti od nastanka infarkta miokarda u bolesnika sa zatajivanjem srca. U stanjima poput šećerne bolesti, metaboličkog sindroma i oštećenja funkcije bubrega ACE-inhibitori su potvrđeni kao temelj poboljšanja dugoročne prognoze. Snižavajući kapilarni tlak u glomerulima vazodilatacijom eferentnih arteriola, ACE-inhibitori mogu usporavati napredovanje mikroalbuminurije u izraženiju proteinuriju i usporavati gubitak bubrežne funkcije ne samo u dijabetičkoj nefropatiji već i u glomerulopatijama, intersticijskom nefritisu i nefrosklerozi. Moguće nuspojave ACE-inhibitora jesu hipotenzija, hiperkaliemija, pogoršanje bubrežne funkcije, suhi kašalj, angioedem, neutropenija, proteinurija, kožni osip i nastanak sindroma fetalne blokade RAAS-a. Uz nužne mjere opreza ACE-inhibitori primijenjeni u bolesnika s odgovarajućim metaboličkim i kardiovaskularnim poremećajima mogu uspješno sniziti povišeni arterijski tlak, a, čini se, bolje od drugih antihipertenziva pridonijeti očuvanju funkcije organa te poboljšati kvalitetu života i ukupnu prognozu.</p>
      </abstract>
      <trans-abstract xml:lang="en">
        <p>By supressing the renin–angiotensin–aldosterone system (RAAS), angiotensin-converting-enzyme inhibitors (ACE inhibitors) are particularly important in treating essential hypertension. ACE inhibitors lower arterial pressure by reducing the peripheral vascular resistance without compensatory increase in the heart rate, the change of baroreceports sensitivity or the occurrence of reflex tachycardia. Research has shown that ACE inhibitors can prevent and stop target organs damage, such as the left ventricular hypertrophy. Slowing down of the LDL particles oxidation and combined with reduction of the blood vessel oxidative stress, the proliferation and hypertrophy of smooth muscle cells and the thromboembolic processes are associated with the slowing down of atherosclerosis advancement. These mechanisms explain the effects of ACE inhibitors in terms of reducing the total and cardiovascular mortality, and the risk of heart attacks in patients with heart failure. In conditions such as diabetes, metabolic syndrome and impaired kidney function failure, ACE inhibitors have been confirmed as the basis for improving long-term prognosis. By reducing the capillary pressure in glomerulus through vasodilatation of efferent arterioles, ACE inhibitors may slow down the advancement of microalbuminuria into more expressed proteinuria and slow down the loss of kidney function not only in diabetic nephropathy, but also in glomerulopathy, interstitial nephritis and nephrosclerosis. Potential side effects of ACE inhibitors are hypotension, hyperkalemia, exacerbation of renal failure, dry cough, angioedema, neutropenia, proteinuria, skin rash and the onset of the fetal RAAS blockade syndrome. With necessary precautions, ACE inhibitors given to patients with adequate metabolic and cardiovascular disorders may successfully lower the elevated arterial pressure, and probably better than other antihypertensives, may contribute to preserving organ function and improve both the quality of life and overall prognosis.</p>
      </trans-abstract>
      <kwd-group xml:lang="hr">
        <kwd>antihipertenzivi</kwd> <kwd>arterijska hipertenzija</kwd> <kwd>ateroskleroza</kwd> <kwd>infarkt miokarda</kwd> <kwd>inhibitori enzima koji konvertira angiotenzin</kwd> <kwd>renin-angiotenzin-aldosteronski sustav</kwd> <kwd>zatajivanje funkcije bubrega</kwd> <kwd>zatajivanje srca</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <kwd>antihypertensives</kwd> <kwd>arterial hypertension</kwd> <kwd>atherosclerosis</kwd> <kwd>myocardial infarction</kwd> <kwd>angiotensin-converting-enzyme inhibitors</kwd> <kwd>renin–angiotensin–aldosterone system</kwd> <kwd>kidney failure</kwd> <kwd>heart failure</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body>
    <sec sec-type="intro">
      <label>Uvod</label>
      <p>Tijekom posljednjih desetljeća stresan i izrazito natjecateljski način života udružen s
        nezdravim prehrambenim navikama, nedovoljnom tjelesnom aktivnošću i pretilošću znatno
        pridonosi sve učestalijoj pojavi povišenog arterijskog tlaka u pučanstvu. Bilo dugotrajan i
        neliječen, bilo neprikladno liječen, povišeni arterijski tlak čest je uzrok brojnih teških
        bolesti poput srčanog zatajivanja, moždanog udara, infarkta miokarda, bolesti perifernih
        arterija i zatajenja funkcije bubrega. Posljedice svih spomenutih bolesti jesu bitno
        smanjenje kvalitete života i skraćivanje životnog vijeka. Liječenje povišenog arterijskog
        tlaka u svakom slučaju mora uključivati opće mjere usmjerene protiv gore nabrojenih
        čimbenika, no često se moraju primijeniti i lijekovi iz skupine antihipertenziva.</p>
      <p>Spoznaje dobivene istraživanjima patofizioloških mehanizama koji sudjeluju u nastanku
        hipertenzije omogućavaju napredak u sprječavanju krvožilnih bolesti i poboljšanje
        cjelokupnog zdravlja pučanstva. Postupni razvoj različitih skupina antihipertenziva povećao
        je mogućnosti bolje prilagodbe liječenja pojedinom bolesniku i dodatnog smanjivanja broja
        kardiovaskularnih bolesti i smrti. Ipak, odgovori na brojna pitanja još su nejasni, dvojbeni
        ili potpuno nepoznati. To se posebice odnosi na liječenje hipertenzije uz postojanje
        razvijene kardiovaskularne bolesti ili uz različite prateće metaboličke poremećaje.</p>
      <p>Današnja stajališta kardioloških društava i društava za hipertenziju podudarna su u tome da
        je dobrobit uzimanja antihipertenziva poglavito posljedica samog snižavanja prethodno
        povišenog arterijskog tlaka te da manje ovisi o tipu upotrijebljenog antihipertenziva (<xref
          rid="r1" ref-type="bibr">1</xref>,<xref rid="r2" ref-type="bibr"> 2</xref>). Ipak,
        pretklinička i klinička istraživanja upućuju na mogućnost postojanja razlika među pojedinim
        antihipertenzivima. Kategorije poput podnošljivosti lijeka, nuspojava ili cijene lijeka
        bitne su i bolesniku i liječniku koji lijek propisuje, ali i prilikom odlučivanja o
        prihvatljivosti lijeka za širu primjenu na razini zdravstvenog sustava. S druge strane,
        razlike u farmakodinamici, farmakokinetici i patofiziološkim mehanizmima djelovanja jesu
        kategorije temeljem kojih određeni lijek smatramo pogodnijim za određenu skupinu, odnosno
        pojedinog bolesnika.</p>
      <p>U odnosu prema ostalim antihipertenzivima posebno značenje inhibitora enzima koji
        konvertira angiotenzin (prema engl. angiotensin-converting-enzyme – ACE) u liječenju
        esencijalne hipertenzije temelji se na pokazateljima bolje učinkovitosti u smanjivanju
        ukupne smrtnosti, kardiovaskularne smrtnosti i opasnosti od nastanka infarkta miokarda
          (<xref rid="r3" ref-type="bibr">3</xref>, <xref rid="r4" ref-type="bibr">4</xref>).
        Mogućnost višestrukoga pozitivnog učinka na kardiovaskularni sustav, bubrežnu funkciju i
        smanjenje broja neželjenih ishoda razlog je zbog kojeg su ACE-inhibitori među najviše
        upotrebljavanim kardiovaskularnim lijekovima. Iako je inhibicija
        renin-angiotenzin-aldosteronskog sustava (RAAS-a) preko ACE-a temelj djelovanja zajednički
        svima, različite kemijske strukture ACE-inhibitora otvaraju niz pitanja i mogućnosti. O
        spomenutim čimbenicima i pitanjima, razlikama i kombiniranju antihipertenziva, mjerama
        opreza i nuspojavama treba razmišljati pri odabiru najboljeg antihipertenziva za pojedinog
        bolesnika</p>   
    </sec>
    <sec>
      <label>Značenje RAAS-a</label>
      <p>RAAS je ključan za održavanje vrijednosti arterijskog tlaka te funkcije srca i bubrega u
        okvirima koji jamče normalno funkcioniranje organizma. Povišeni arterijski tlak izaziva
        povećano mehaničko naprezanje krvnih žila i uzrokuje njihovo oštećivanje zbog čega se
        aktivira lokalni upalni odgovor koji pokušava sanirati nastala oštećenja (<xref rid="r5"
          ref-type="bibr">5</xref>). Povišeni je arterijski tlak dugotrajan, stalan i neovisan
        čimbenik opasnosti od nastanka nepoželjnih kardiovaskularnih događaja. Što je tlak viši,
        veća je opasnost od nastanka infarkta miokarda, moždanog udara te zatajivanja srca i
        bubrežne funkcije (<xref rid="r1" ref-type="bibr">1</xref>, <xref rid="r2" ref-type="bibr"
          >2</xref>). Povećana aktivnost RAAS-a iz bilo kojeg razloga povisuje arterijski tlak i
        pokreće opisanu kaskadu. Stoga, a i zbog dodatnih učinaka, posebice povoljnog djelovanja na
        kardiovaskularni kontinuum, lijekovi koji suprimiraju RAAS smatraju se ključnom sastavnicom
        suvremenog liječenja povišenog arterijskog tlaka i pridruženih kardiovaskularnih bolesti
          (<xref rid="r2" ref-type="bibr">2</xref>, <xref rid="r5" ref-type="bibr">5</xref>).</p>
      <p>Učinkovit rad vitalnih organa i održavanje normalnih vrijednosti arterijskog tlaka nužni su
        za normalan rad svih organa i sustava. Time postavljena osnova za biološko odnosno tjelesno
        zdravlje potom omogućava postizanje osjećaja sveukupnog zdravlja, blagostanja i sreće.
        Brojni patofiziološki mehanizmi sudjeluju u kratkoročnoj i dugoročnoj regulaciji arterijskog
        tlaka. Dugoročna regulacija arterijskog tlaka posljedica je usklađenosti brojnih živčanih i
        hormonskih mehanizama s normalnim djelovanjem bubrega kao djelomično izdvojene cjeline koja
        između ostalog obavlja izlučivanje soli i vode (<xref rid="r6" ref-type="bibr">6</xref>).
        Među tim mehanizmima RAAS je jedan od najvažnijih sustava, a osim njega važnu ulogu imaju i
        sustavi kalikrein-kinina, endotelina i natriuretskih peptida. Svi ti sustavi sudjeluju u
        stvaranju različitih vazoregulacijskih peptida, kao i u uravnoteženoj regulaciji tekućine i
        elektrolita čime stvaraju preduvjete za dobru dugoročnu regulaciju arterijskog tlaka.</p>
      <p>Kaskada RAAS-a počinje oslobađanjem renina iz bubrega u krvotok kao odgovor na sniženje
        perfuzijskog tlaka, odnosno na manji volumen protoka u bubregu (<xref rid="f1"
          ref-type="fig">slika 1.</xref>). Renin u krvotoku cijepa angiotenzinogen u neaktivni
        peptid angiotenzin I koji se potom konvertira u aktivni oktapeptid angiotenzin II. Za oko
        60% te konverzije zaslužan je ACE, a drži se da u ostatku konverzije sudjeluju kimaza,
        katepsin G i neke od serinskih proteaza (<xref rid="r7" ref-type="bibr">7</xref>). Osim
        endokrinih učinaka angiotenzina II iz krvotoka, parakrino i autokrino djelovanje posljedica
        su lokalno stvorenog angiotenzina II, uglavnom putem tkivnog ACE-a, a možda i putem drugih
        enzimskih procesa.</p>
      <p>Uz druga djelovanja angiotenzin II podražuje dvije podvrste receptora, AT1 i AT2. Većina
        nepovoljnih učinaka angiotenzina II na srce, bubrege i cjelokupno žilje te lučenje
        aldosterona posljedica je upravo podražaja AT1-receptora. Njihovim aktiviranjem pokreću se
        genski mehanizmi s unutarstaničnim djelovanjem različitih transkripcijskih čimbenika. Oni
        putem povećanog oksidativnog stresa i aktivnosti transformirajućeg čimbenika rasta ß
        povećavaju upalne, aterogene i protrombotske procese te potiču vazokonstrikciju, endotelnu
        disfunkciju i remodeliranje (<xref rid="r8" ref-type="bibr">8</xref>, <xref rid="r9"
          ref-type="bibr">9</xref>). U konačnici, zbirni učinak cjelokupnog procesa jest nepovoljno
        remodeliranje srca i krvožilja, poticanje ateroskleroze te povećanje opasnosti od nastanka
        akutnih kardiovaskularnih incidenata. Za razliku od toga podraživanje AT2-receptora u
        normalnim uvjetima ima potpuno suprotne učinke.</p>
      <p>Patofiziološki mehanizmi djelovanja RAAS-a višestruko su isprepleteni s brojnim drugim
        mehanizmima koji također potiču nastanak povišenog arterijskog tlaka. Stoga je RAAS posebno
        zanimljiv za antihipertenzivno liječenje pa danas postoje mogućnosti inhibicije ovog sustava
        na pet razina. Uz ACE-inhibitore i blokatore AT1-receptora RAAS na različitim mjestima
        suprimiraju i ß-blokatori, inhibitori renina te antagonisti mineralokortikoidnih receptora
          (<xref rid="f1" ref-type="fig">slika 1.</xref>).</p>
      <p><fig id="f1">
        <label>SLIKA 1.</label>
        <caption><p>Pojednostavnjeni prikaz dijela renin-angiotenzin-aldosteronskog sustava uključenog u nastanak povišenog arterijskog tlaka.
          Naznačena su mjesta djelovanja lijekova upotrebljavanih za supresiju ovog sustava</p></caption>
        <graphic xlink:href="medicus-25-127-g1.jpg"></graphic>
        <p>*ACE – enzim koji konvertira angiotenzin</p>
      </fig>
      </p>
      <p>Osim u bolesnika s povišenom aktivnošću RAAS-a, mjereno primjerice povišenim
        koncentracijama renina, angiotenzina II ili aldosterona u plazmi, brojna su istraživanja
        potvrdila opravdanost njihove primjene i u ostalih bolesnika. Jedan od najvažnijih ciljeva
        jest supresija angiotenzina II i aldosterona, što se u početku i postigne. Međutim, nakon
        određenog vremena nastupi takozvani „bijeg od blokiranja RAAS-a“ kada se koncentracije
        angiotenzina II i aldosterona vrate na one od prije početka liječenja ili čak i više. Ipak,
        određena razina supresije RAAS-a ostaje, a čini se da popratno povišenje aktivnosti
        različitih metabolita angiotenzina ima neovisno supresivno djelovanje na RAAS (<xref
          rid="r10" ref-type="bibr">10</xref>, <xref rid="r11" ref-type="bibr">11</xref>).</p>
      <p>Neke spolne razlike opažene u aktivnosti RAAS-a objašnjavaju se djelovanjem spolnih
        hormona. Povoljni učinci estrogena na čitavu strukturu i funkciju kardiovaskularnog sustava
        vrlo su dobro poznati (<xref rid="r12" ref-type="bibr">12</xref>, <xref rid="r13"
          ref-type="bibr">13</xref>). Glede RAAS-a, estrogeni povisuju koncentraciju
        angiotenzinogena, sintaze dušikova monoksida u endotelu i ACE2 te gustoću AT2-receptora.
        Također, estrogeni snižavaju koncentraciju renina i ACE-a, gustoću AT1-receptora te
        aktivnost NADPH-oksidaze, a zbirni učinak svih spomenutih mehanizama jest poticanje
        sastavnica RAAS-a uključenih u vazodilataciju (<xref rid="r14" ref-type="bibr">14</xref>,
          <xref rid="r15" ref-type="bibr">15</xref>). Nakon menopauze opisana djelovanja slabe te
        postupno počinje prevladavati vazokonstrikcijski dio RAAS-a (<xref rid="r15" ref-type="bibr"
          >15</xref>). Nasuprot tomu, uz brojne druge učinke na srce i krvožilje (<xref rid="r16"
          ref-type="bibr">16</xref>, <xref rid="r17" ref-type="bibr">17</xref>), testosteron
        povisuje koncentraciju renina i ACE-a, povećava gustoću AT1-receptora te smanjuje
        osjetljivost AT2-receptora, što sve potiče vazokonstrikciju (<xref rid="r18" ref-type="bibr"
          >18</xref>, <xref rid="r19" ref-type="bibr">19</xref>). Trenutačno nije poznato utječu li
        i kako opisane razlike na djelovanje i učinkovitost ACE-inhibitora.</p>
    </sec>
    <sec>
      <label>Mehanizmi djelovanja ACE-inhibitora i usporedba s drugim antihipertenzivima</label>
      <p>Iako je snižavanje arterijskog tlaka glavni zaštitni mehanizam antihipertenziva, katkad
        zbog postojećih pratećih stanja i bolesti držimo da će neki lijekovi ostvariti bolji učinak
        od drugih. U čemu je posebnost ACE-inhibitora? Njihova se primjena u liječenju esencijalne
        hipertenzije i bolesti kardiovaskularnog sustava temelji na nekoliko smjerova djelovanja.
        Osim samog snižavanja arterijskog tlaka i dobre podnošljivosti važan je mogući učinak
        sprječavanja, zaustavljanja ili čak smanjivanja postojećih oštećenja ciljnih organa, što
        nazivamo organoprotekcijom. ACE-inhibitori su se nedvosmisleno pokazali učinkovitima u
        smanjivanju ukupne smrtnosti, kardiovaskularne smrtnosti i opasnosti od nastanka infarkta
        miokarda (<xref rid="r3" ref-type="bibr">3</xref>, <xref rid="r4" ref-type="bibr">4</xref>).
        Zbog svega toga ACE-inhibitori su među najviše upotrebljavanim antihipertenzivnim i
        kardiovaskularnim lijekovima općenito.</p>
      <p>Klinička istraživanja najjasnije su upozorila na korist ACE-inhibitora u bolesnika sa
        zatajivanjem srčane funkcije. Najdojmljivije je smanjivanje ukupne smrtnosti u bolesnika sa
        sistoličkom disfunkcijom, što se pripisuje usporavanju napredovanja kongestivnog zatajivanja
          (<xref rid="r20" ref-type="bibr">20</xref> − <xref rid="r22" ref-type="bibr">22</xref>).
        Međutim, smanjivanje smrtnosti opaženo je i u bolesnika s asimptomatskom disfunkcijom lijeve
        klijetke, i to barem dijelom zbog smanjenja opasnosti od nastanka infarkta miokarda u tih
        bolesnika (<xref rid="r23" ref-type="bibr">23</xref>, <xref rid="r24" ref-type="bibr"
          >24</xref>). Konačno, u znatnog je broja bolesnika uzrok zatajivanja srca dijastolička
        disfunkcija kao posljedica hipertrofije lijeve klijetke. Klinička istraživanja pokazuju da
        ACE-inhibitori smanjuju hipertrofiju lijeve klijetke u bolesnika s povišenim arterijskim
        tlakom (<xref rid="r25" ref-type="bibr">25</xref> − <xref rid="r27" ref-type="bibr"
          >27</xref>), i to, čini se, učinkovitije od ostalih antihipertenziva (<xref rid="r27"
          ref-type="bibr">27</xref>). Temeljni mehanizam ACE-inhibitora u ovom slučaju zacijelo je
        zaustavljanje trofičkog učinka angiotenzina II na stanice srčanog mišića čime se čak možda
        može i obrnuti proces nepovoljnog remodeliranja srca (<xref rid="r28" ref-type="bibr"
          >28</xref>, <xref rid="r29" ref-type="bibr">29</xref>).</p>
      <p>Povoljni učinci ACE-inhibitora na smanjivanje upalnih procesa i usporavanje ateroskleroze,
        ponajprije putem stabilizacije razvijenih aterosklerotskih plakova, temelj su njihove
        primjene u bolesnika s koronarnom i perifernom arterijskom bolešću (<xref rid="r30"
          ref-type="bibr">30</xref>). U pretkliničkim istraživanjima primjena ACE-inhibitora
        povezana je s usporavanjem oksidacije LDL-čestica i napredovanjem ateroskleroze (<xref
          rid="r31" ref-type="bibr">31</xref>, <xref rid="r32" ref-type="bibr">32</xref>), a
        smanjivanje oksidativnog stresa u stijenkama krvnih žila moglo bi usporavati proliferaciju i
        hipertrofiju glatkih mišićnih stanica (<xref rid="r33" ref-type="bibr">33</xref>, <xref
          rid="r34" ref-type="bibr">34</xref>) te razvoj hipertenzije (<xref rid="r35"
          ref-type="bibr">35</xref>). Aktivirani RAAS brojnim mehanizmima potpomaže nastajanje
        aterosklerotskih plakova u koronarnim arterijama, a stvaranje ugrušaka zbog povišenog
        arterijskog tlaka pridonosi rastu i destabilizaciji tih plakova (<xref rid="r36"
          ref-type="bibr">36</xref>). Glede toga, primjena ACE-inhibitora povezuje se s povoljnim
        učinkom na ravnotežu renin-angiotenzinskog sustava i kalikrein-kininskog sustava, što osim
        snižavanja krvnog tlaka također smanjuje rizik od nastanka tromboembolijskih događaja (<xref
          rid="r37" ref-type="bibr">37</xref>). Nadalje, primjena ACE-inhibitora u hipertoničara, no
        isto tako i u koronarnih bolesnika bez hipertenzije te bolesnika sa šećernom bolešću
        popravlja endotelnu disfunkciju (<xref rid="r38" ref-type="bibr">38</xref>), a smanjivanjem
        naprezanja fibrozne kape aterosklerotskih plakova bogatih mastima mogla bi dugoročno
        stabilizirati takve plakove (<xref rid="r39" ref-type="bibr">39</xref>).</p>
      <p>Nasuprot dugotrajnom djelovanju u stabilizaciji aterosklerotskih lezija čini se da
        ACE-inhibitori, u usporedbi s ß-blokatorima ili antagonistima kalcijskih kanala, imaju
        slabiji zaštitni učinak protiv akutnih koronarnih incidenata izazvanih svakodnevnim
        okidačkim događajima poput tjelesnog napora ili emocionalnog stresa (<xref rid="r40"
          ref-type="bibr">40</xref>). Nadalje, za razliku od antagonista kalcijskih kanala i
        ß-blokatora koji smanjuju opasnost od nastanka infarkta miokarda nakon proljetnog i
        jesenskog pomicanja sata zbog ljetnog računanja vremena (<xref rid="r41" ref-type="bibr"
          >41</xref> − <xref rid="r43" ref-type="bibr">43</xref>), čini se da ACE-inhibitori tu
        opasnost povećavaju (<xref rid="r39" ref-type="bibr">39</xref>, <xref rid="r41"
          ref-type="bibr">41</xref>), što bi se moglo povezati s izraženijom kratkoročnom
        varijabilnošću arterijskog tlaka posebice pri uporabi viših doza ACE-inhibitora (<xref
          rid="r44" ref-type="bibr">44</xref>). Ipak, sveukupno uzevši, klinička istraživanja
        nedvojbeno upućuju na povoljne dugotrajne učinke liječenja koronarne bolesti
        ACE-inhibitorima. U smanjivanju opasnosti od nastanka infarkta miokarda i kardiovaskularne
        smrtnosti ACE-inhibitori se čine boljima i uspješnijima od blokatora AT2-receptora, također
        lijekova koji djeluju na RAAS, pri čemu bi ovi potonji mogli imati bolji zaštitni učinak
        protiv moždanog udara (<xref rid="r3" ref-type="bibr">3</xref>, <xref rid="r4"
          ref-type="bibr">4</xref>).</p>
      <p>Glavni hemodinamski učinci ACE-inhibitora jesu smanjivanje perifernoga vaskularnog otpora
        bez kompenzacijskog povišenja srčane frekvencije i promjene osjetljivosti baroreceptora
          (<xref rid="r45" ref-type="bibr">45</xref> − <xref rid="r48" ref-type="bibr">48</xref>) te
        sprječavanje općega stimulativnog učinka angiotenzina II na simpatički živčani sustav (<xref
          rid="r49" ref-type="bibr">49</xref>). ACE-inhibitori ne remete normalni odgovor srčane
        frekvencije na promjenu položaja tijela i napor (<xref rid="r50" ref-type="bibr">50</xref>),
        ne uzrokuju pojavu refleksne tahikardije (<xref rid="r51" ref-type="bibr">51</xref>), a
        povezuju se s manjom učestalošću pojave ventrikularnih ekstrasistola, posebice u muškaraca i
        bolesnika mlađih od 65 godina (<xref rid="r52" ref-type="bibr">52</xref>).</p>
      <p>U stanjima poput šećerne bolesti, metaboličkog sindroma i uznapredovaloga bubrežnog
        oštećenja ACE-inhibitori su potvrđeni kao temelj poboljšanja dugoročne prognoze. U bubrežnim
        poremećajima općenito, djelovanje RAAS-a i povišeni kapilarni tlak u glomerulima drže se
        glavnim uzročnicima postupnog pogoršanja bubrežne funkcije (<xref rid="r53" ref-type="bibr"
          >53</xref>). ACE-inhibitori snižavaju kapilarni tlak u glomerulima snižavajući krvni tlak
        i selektivno djelujući na vazodilataciju eferentnih arteriola (<xref rid="r54"
          ref-type="bibr">54</xref>). U bolesnika sa šećernom bolešću ACE-inhibitori usporavaju
        napredovanje mikroalbuminurije u izraženiju proteinuriju (<xref rid="r55" ref-type="bibr"
          >55</xref>) i usporavaju gubitak ukupne bubrežne funkcije (<xref rid="r56" ref-type="bibr"
          >56</xref> − <xref rid="r58" ref-type="bibr">58</xref>). ACE-inhibitorima se pripisuje
        renoprotektivni učinak ne samo u dijabetičkoj nefropatiji nego i u drugim bubrežnim
        poremećajima poput glomerulopatija, intersticijskog nefritisa i nefroskleroze (<xref
          rid="r56" ref-type="bibr">56</xref>, <xref rid="r59" ref-type="bibr">59</xref>).</p>
      <p>Zbog svega opisanog, u liječenju hipertenzije u svakodnevnoj praksi ACE-inhibitori imaju
        prednost pri liječenju bolesnika s utvrđenom kliničkom krvožilnom bolešću ili oštećenjem
        ciljnih organa poput svih oblika koronarne bolesti, hipertrofije lijeve klijetke,
        zatajivanja srca, aneurizme aorte, cerebrovaskularne ili periferne arterijske bolesti te
        šećerne bolesti, metaboličkog sindroma i uznapredovaloga bubrežnog oštećenja (<xref rid="t1"
          ref-type="table">tablica 1.</xref>).</p>
      <p>
        <table-wrap id="t1">
          <label>TABLICA 1.</label>
          <caption><p>Antihipertenzivi preporučeni za određena stanja i bolesti.</p></caption>
          <table>
           <thead><tr><td>KLINIČKA PRIMJENA U LIJEČENJU
            BOLESNIKA</td> <td colspan="5">LIJEK</td></tr></thead>
            <tbody><tr><td></td><td><bold>ACE-inhibitor</bold></td> <td><bold>antagonist kalcijskih kanala</bold></td>
            <td><bold>blokatori AT1- receptora</bold></td> <td><bold>ß-blokator </bold></td><td><bold>diuretik</bold></td></tr>
             <tr><td colspan="6">ASIMPTOMATSKO OŠTEĆENJE ORGANA</td></tr>
              <tr align="center"> <td>hipertrofija lijeve klijetke</td> <td>+</td> <td>+</td> <td>+</td><td></td><td></td></tr>
              <tr align="center"><td>asimptomatska ateroskleroza</td> <td>+</td> <td>+</td><td></td><td></td><td></td></tr>
              <tr align="center"> <td>mikroalbuminurija</td> <td>+</td><td></td> <td>+</td><td></td><td></td></tr>
              <tr align="center"><td>bubrežno oštećenje</td> <td>+</td><td></td> <td>+</td><td></td><td></td></tr>
              <tr><td colspan="6">KLINIČKA KARDIOVASKULARNA</td></tr>
              <tr align="center"><td>angina pektoris</td> <td></td><td>+</td> <td></td><td>+</td><td></td></tr>
              <tr align="center"><td>prethodni infarkt</td> <td>+</td><td></td> <td>+</td> <td>+</td><td></td></tr>
              <tr align="center"><td>zatajivanje srca</td> <td>+</td> <td></td><td>+</td> <td>+</td> <td>* †</td></tr>
              <tr align="center"><td>atrijska fibrilacija, prevencija</td> <td>+</td><td></td> <td>+</td> <td>+</td> <td>†</td></tr>
              <tr align="center"><td>aneurizma aorte</td><td></td><td></td><td></td><td></td><td></td></tr>
              <tr align="center"><td>prethodni moždani udar</td> <td>+</td> <td>+</td> <td>+</td> <td>+</td> <td>+</td></tr>
              <tr align="center"><td>bolest perifernih arterija</td> <td></td><td></td><td></td><td>+</td><td></td></tr>
              <tr><td colspan="6">OSTALO</td></tr>
              <tr align="center"><td>izolirana sistolička hipertenzija</td><td></td> <td>+</td> <td></td><td></td><td>+</td></tr>
              <tr align="center"><td>proteinurija</td> <td>+</td> <td></td><td>+</td><td></td><td></td></tr>
              <tr align="center"><td>terminalno bubrežno zatajenje</td> <td>+</td><td></td> <td>+</td><td></td><td></td></tr>
              <tr align="center"><td>metabolički sindrom</td> <td>+</td> <td>+</td> <td>+</td><td></td><td></td></tr>
              <tr align="center"><td>šećerna bolest</td> <td>+</td><td></td> <td>+</td><td></td><td></td></tr>
            </tbody>
          </table>
          <table-wrap-foot><p>*diuretici Henleove petlje; † antagonisti mineralokortikoidnih receptora; ACE – enzim koji konvertira angiotenzin</p></table-wrap-foot>
        </table-wrap>
      </p>
      <p>Osim bolje regulacije arterijskog tlaka kombinacijom više antihipertenziva pokušavaju se
        povećati prednosti i umanjiti moguće neželjene pojave. Kombinacija ACE-inhibitora s
        tiazidskim diureticima u teoriji može ublažiti reaktivnu stimulaciju RAAS-a uz istodobno
        ublažavanje mogućih poremećaja koncentracije elektrolita i nepovoljnih metaboličkih učinaka
        diuretika. </p>
      <p>Kombinacijom ACE-inhibitora s antagonistima kalcijskih kanala mogu se ostvariti poželjni
        metabolički učinci, združeni povoljni učinak na smanjenje proteinurije i poboljšanje
        glomerularne filtracije uz povećanje diureze, poboljšanje popustljivosti i rastegljivosti
        arterija, uravnoteženje fibrinolitičkog sustava, kao i ublažavanje kompenzacijske aktivacije
        simpatičkoga živčanog sustava i vazodilatacijskih edema uzrokovanih antagonistima kalcijskih
        kanala. Konačno, kombinacija s ß-blokatorima osnova je liječenja bolesnika sa zatajivanjem
        srca (<xref rid="t1" ref-type="table">tablica 1.</xref> i <xref rid="f2" ref-type="fig"
          >slika 2.</xref>).</p>
      <p><fig id="f2">
          <label>SLIKA 2.</label>
          <caption>
            <p>Pojednostavnjeni prikaz kombiniranja najčešće primjenjivanih antihipertenziva s
              naglaskom na mjesto inhibitora enzima koji konvertira angiotenzin (ACE)</p>
          </caption>
          <graphic xlink:href="medicus-25-127-g2.jpg"/>
          <p>Zelene crte označavaju povoljne i potvrđene kombinacije, plava označava povoljnu
            kombinaciju u srčanom zatajivanju, a crvena oprez zbog veće mogućnosti nuspojava.
            Kombinacije s ostalim antihipertenzivima manje su povoljne ili manje istražene.</p>
        </fig>
      </p>
    </sec>
    <sec>
      <label>Razlike među pojedinim ACE-inhibitorima</label>
      <p>Lijekovi uvršteni u određenu skupinu antihipertenziva imaju temeljni zajednički mehanizam
        djelovanja, a zatim se dijele u podskupine ovisno o svojoj kemijskoj strukturi. Zajedničko
        djelovanje ACE-inhibitora jest blokiranje konverzije inaktivnog angiotenzina I u aktivni
        angiotenzin II i umanjivanje aktivnosti RAAS-a. Ta definicija opisuje kvalitativnu bit
        djelovanja, no ne i kvantitativnu. Različita kemijska struktura pojedinih ACE-inhibitora
        dopušta mogućnost različitih učinaka. Osim prema kemijskoj strukturi aktivne komponente
        ACE-inhibitori se razlikuju prema bioraspoloživosti, snazi, distribuciji i mogućnosti
        vezanja u tkivima, putu izlučivanja, poluvijeku u plazmi te činjenici jesu li u trenutku
        uzimanja u obliku predlijeka ili pak aktivne tvari koja izravno inhibira ACE. Odgovarajućim
        odabirom indikacije i bolesnika moguće razlike među pojedinim ACE-inhibitorima mogle bi
        pojačati terapijski učinak i ukupnu dobrobit te smanjiti vjerojatnost neželjenih
        učinaka.</p>
      <p>Prema kemijskoj strukturi, ACE-inhibitori se mogu svrstati u tri skupine: 1) oni koji
        sadržavaju sulfhidrilnu skupinu poput kaptoprila i zofenoprila; 2) oni s fosfinilnom
        skupinom, a jedini je sadržava fosinopril te 3) oni koji sadržavaju dikarboksilnu skupinu
        poput cilazaprila, enalaprila, lizinoprila, perindoprila i ramiprila (<xref rid="r60"
          ref-type="bibr">60</xref>, <xref rid="r61" ref-type="bibr">61</xref>). Također, klinički
        je važno imati na umu put izlučivanja pojedinog ACE-inhibitora (<xref rid="t2"
          ref-type="table">tablica 2.</xref>) jer se tada zamjenom lijeka iste skupine mogu zadržati
        prednosti uz smanjenje neželjenih pojava zbog neometanog izlučivanja iz organizma (<xref
          rid="r60" ref-type="bibr">60</xref>, <xref rid="r62" ref-type="bibr">62</xref>).</p>
      <p><table-wrap id="t2">
        <label>TABLICA 2.</label>
        <caption><p>Način izlučivanja različitih ACE-inhibitora</p></caption>
        <table>
          <thead>
            <tr><td rowspan="2">Naziv lijeka</td>
              <td colspan="2">Put izlučivanja</td>
              </tr>
            <tr><td>bubreg</td> <td>jetra</td></tr>
          </thead>
          <tbody>
            <tr align="center"><td>benazepril</td> <td>~ 50%</td> <td>~ 50%</td></tr>
            <tr align="center"><td>cilazapril</td> <td>da</td> <td>ne</td></tr>
            <tr align="center"><td>enalapril</td> <td>da</td> <td>malo</td></tr>
            <tr align="center"><td>fosinopril</td> <td>~ 50%</td> <td>~ 50%</td></tr>
            <tr align="center"><td>lizinopril</td> <td>da</td> <td>ne</td></tr>
            <tr align="center"><td>kaptopril</td> <td>da</td> <td>malo</td></tr>
            <tr align="center"><td>perindopril</td> <td>da</td> <td>malo</td></tr>
            <tr align="center"><td>kvinapril</td> <td>da</td> <td>malo</td></tr>
            <tr align="center"><td>ramipril</td> <td>~ 70%</td> <td>~ 30%</td></tr>
            <tr align="center"><td>trandolapril</td> <td>~ 30%</td> <td>~ 70%</td></tr>
          </tbody>
        </table>
        <table-wrap-foot><p>ACE – enzim koji konvertira angiotenzin</p></table-wrap-foot>
      </table-wrap>
      </p>
      <p>Najvažniji učinak ACE-inhibitora zacijelo se zbiva u endotelu krvožilja i podjednako je
        dostupan svim lijekovima ove skupine neovisno o njihovoj farmakokinetici. Ipak, lipofilnost
        lijeka također utječe na farmakokinetiku i u izravnoj je svezi s njegovim prodiranjem u
        tkiva. Budući da se 90% aktivnosti RAAS-a zbiva u tkivu srca, bubrega i u krvožilju, jača
        inhibicija tkivnog ACE-a, znatnije smanjenje apoptoze endotelnih stanica i veća selektivnost
        za vezna mjesta bradikinina mogli bi imati dodatni učinak upravo u tim organima.
        Posljedično, lipofilniji ACE-inhibitori poput kvinaprila, perindoprila, ramiprila i
        trandolaprila mogli bi imati izraženije protektivne učinke na ciljne organe (<xref rid="r63"
          ref-type="bibr">63</xref>, <xref rid="r64" ref-type="bibr">64</xref>).</p>
      <p><table-wrap id="t3">
        <label>TABLICA 3.</label>
        <caption><p>Ekvivalentne doze različitih ACE-inhibitora</p></caption>
        <table>
          <thead><tr><td rowspan="2" valign="middle">Naziv lijeka</td>
            <td colspan="4" align="center">Doze</td></tr>
            <tr align="center">
                <td>ekvivalentne</td>
                <td>početne</td>
                <td>uobičajene</td>
                <td>najviše dnevne</td>
              </tr>
          </thead>
          <tbody>
            <tr align="center">
                <td>benazepril</td>
                <td>10 mg</td>
                <td>10 mg</td>
                <td>20 – 40 mg</td>
                <td>80 mg</td>
              </tr>
            <tr align="center"><td>cilazapril</td> <td>2,5 mg</td> <td>2,5 mg</td> <td>2,5 – 5 mg</td> <td>10 mg</td></tr>
            <tr align="center"><td>enalapril</td> <td>5 mg</td> <td>5 mg</td> <td>10 – 20 mg</td> <td>40 mg</td></tr>
            <tr align="center"><td>fosinopril</td> <td>10 mg</td> <td>10 mg </td><td>20 – 40 mg</td> <td>80 mg</td></tr>
            <tr align="center"><td>lizinopril</td> <td>10 mg</td> <td>10 mg</td> <td>10 – 40 mg</td> <td>80 mg</td></tr>
            <tr align="center"><td>kaptopril*</td> <td>50 mg</td> <td>25 – 75 mg</td> <td>50 – 150 mg</td> <td>450 mg</td></tr>
            <tr align="center"><td>perindopril</td> <td>4 mg</td> <td>4 mg</td> <td>4 – 8 mg</td> <td>16 mg</td></tr>
            <tr align="center"><td>kvinapril</td> <td>10 mg</td> <td>10 mg</td> <td>20 – 40 mg</td> <td>80 mg</td></tr>
            <tr align="center"><td>ramipril</td> <td>2,5 mg</td> <td>2,5 mg</td> <td>2,5 – 10 mg</td> <td>20 mg</td></tr>
            <tr align="center"><td>trandolapril</td> <td>2 mg</td> <td>1 mg</td> <td>2 – 4 mg</td> <td>8 mg</td></tr>
          </tbody>
        </table>
        <table-wrap-foot><p>* podijeljeno u 2 do 3 dnevne doze; ACE – enzim koji konvertira angiotenzin</p></table-wrap-foot>
      </table-wrap>
      </p>
      <p>Katkad, zbog opisanih razlika među ACE-inhibitorima, zamjena lijeka u ovoj skupini
        antihipertenziva može izgledati poželjnom i korisnom. Pri odmjeravanju moguće koristi i
        opasnosti od neželjenog djelovanja, ili pri nastanku nuspojava, tijekom zamjene prethodno
        uključenog ACE-inhibitora, nužno je voditi računa o odgovarajućoj ekvivalentnoj dozi (<xref
          rid="t3" ref-type="table">tablica 3.</xref>). Ipak, trenutačno nemamo potvrdu da se
        liječenjem baš određenim ACE-inhibitorom postižu bolji rezultati u očuvanju bubrežne
        funkcije, sprječavanju akutnoga koronarnog incidenta ili preživljenju u zatajivanju
        srca.</p>
    </sec>
    <sec>
      <label>Nuspojave i mjere opreza</label>
      <p>Većina bolesnika koji uzimaju ACE-inhibitore nema neželjenih popratnih pojava niti
        poremećaja biokemijskih pokazatelja koji bi uz pridružene metaboličke i kardiološke bolesti
        mogli imati kliničko značenje. To se ponajprije odnosi na porast koncentracije lipida,
        glukoze ili mokraćne kiseline te na snižavanje koncentracije kalija, što se katkad događa
        prilikom uzimanja drugih antihipertenziva. Ipak, neke nuspojave zajedničke svim
        antihipertenzivima, kao i neke nuspojave specifične za ACE-inhibitore, nalažu oprez.</p>
      <p>Kao i ostali antihipertenzivi ACE-inhibitori mogu izazvati hipotenziju koja se češće
        pojavljuje u bolesnika s povišenom reninskom aktivnošću. Stoga je poglavito u tih bolesnika,
        ali i općenito, preporučljivo započeti liječenje nižim dozama lijeka (<xref rid="r65"
          ref-type="bibr">65</xref>). Nadalje, zbog snižene koncentracije aldosterona ACE-inhibitori
        mogu izazvati nastanak hiperkaliemije. Ona se znatno češće razvije uz nazočnost nekoga
        potpomažućeg čimbenika poput uzimanja diuretika koji štede kalij, uporabe preparata i
        dodataka prehrani koji sadržavaju kalij ili pak oslabljene funkcije bubrega (<xref rid="r66"
          ref-type="bibr">66</xref>, <xref rid="r67" ref-type="bibr">67</xref>).</p>
      <p>Pogoršanje bubrežne funkcije uz primjenu ACE-inhibitora može nastupiti uz smanjenje
        bubrežnog protoka zbog obostrane stenoze renalnih arterija (<xref rid="r68" ref-type="bibr"
          >68</xref>), uz postojeće smanjenje cirkulirajućeg volumena (<xref rid="r69"
          ref-type="bibr">69</xref>) ili pri teškome srčanom zatajenju (<xref rid="r70"
          ref-type="bibr">70</xref>). U tom smislu, posljednjih je godina pitanje dvojne inhibicije
        RAAS-a postalo posebno zanimljivo u kliničkoj primjeni ACE-inhibitora i blokatora
        AT1-receptora. Iako postoje različita mišljenja o tome (<xref rid="r71" ref-type="bibr"
          >71</xref>), rezultati metaanalize 33-ju randomiziranih kliničkih pokusa objavljene 2013.
        godine ne upućuju na prednost takve dvojne inhibicije RAAS-a, uz istodobno više neželjenih
        učinaka (od 41 do 66%) poput hiperkaliemije, akutnog oštećenja bubrežne funkcije i
        hipotenzije u odnosu prema uporabi samo jednog od ta dva lijeka (<xref rid="r72"
          ref-type="bibr">72</xref>).</p>
      <p>Kako je prethodno naglašeno, jedan od dva glavna antihipertenzivna mehanizma ACE-inhibitora
        jest usporavanje razgradnje bradikinina (<xref rid="f1" ref-type="fig">slika 1.</xref>). No,
        upravo je to uzrok dvjema neželjenim pojavama. Prva je suhi kašalj koji osim bradikinina
        može imati uzroke u povišenju koncentracije supstancije P i stimulaciji završetaka živca
        vagusa (<xref rid="r73" ref-type="bibr">73</xref>). Lijekovi koji antagoniziraju djelovanje
        tromboksana, poput acetilsalicilne kiseline, ili pak nadoknadna terapija preparatima željeza
        smanjuju izraženost kašlja (<xref rid="r65" ref-type="bibr">65</xref>). Međutim, drži se da
        visoke doze acetilsalicilne kiseline (300 mg ili više), kao i drugih nesteroidnih
        antireumatika, mogu znatno umanjiti antihipertenzivni učinak ACE-inhibitora. Kašalj uglavnom
        prestaje tijekom sljedeća tri tjedna nakon prestanka uzimanja ACE-inhibitora, no katkad može
        potrajati i duže. Druga nuspojava nakupljanja bradikinina jest angioedem, poprilično
        rijetka, ali za život opasna reakcija preosjetljivosti. Uključuje otok usana i drugih
        dijelova lica, usne šupljine, jezika te tkiva u području grla i nosa (<xref rid="r73"
          ref-type="bibr">73</xref>).</p>
      <p>Nekoliko nuspojava ACE-inhibitora povezuje se sa sulfhidrilnom skupinom, koja inače ima
        antioksidativno djelovanje. Te nuspojave uključuju poremećaj osjeta okusa, neutropeniju,
        proteinuriju i kožni osip, a učestalije su u bolesnika sa zatajivanjem bubrežne funkcije i u
        onih s bolestima vezivnog tkiva uz zahvaćeno krvožilje (<xref rid="r74" ref-type="bibr"
          >74</xref>, <xref rid="r75" ref-type="bibr">75</xref>). Učestalost kožnog osipa manja je
        od 1% i uglavnom se očituje pruritičnim makulopapularnim promjenama, a samo iznimno poprimi
        oblik eksfolijativnog dermatitisa. Drži se da je vjerojatnost nastanka osipa razmjerna
        visini doze lijeka (<xref rid="r60" ref-type="bibr">60</xref>).</p>
      
    </sec>
    <sec>
      <label>ACE-inhibitori i trudnoća</label>
      <p>Zasigurno najvažnija i najnepoželjnija posljedica, intrauterino oštećenje djeteta, može
        nastati pri primjeni ACE-inhibitora u generativnoj dobi žena koje boluju od hipertenzije. To
        je posebice važno jer su u otprilike 5% tih žena ACE-inhibitori antihipertenzivi prvog
        izbora (<xref rid="r76" ref-type="bibr">76</xref>) prema prije opisanim kriterijima. Srž je
        problema u tome što je primjeren razvoj RAAS-a nuždan za intrauterini razvoj čitavog
        djeteta, a ponajviše za razvoj bubrega. Kod mutacije i gubitka funkcije gena koji upravljaju
        razvojem RAAS-a poremećeni razvoj bubrega uzrokuje smanjeno izlučivanje mokraće, što izaziva
        oligohidramnion, poremećaje okoštavanja lubanje, hipotenziju djeteta pri rađanju, a sve
        često završava smrću novorođenčeta (<xref rid="r77" ref-type="bibr">77</xref>, <xref
          rid="r78" ref-type="bibr">78</xref>). Kada se intrauterini poremećaji dogode zbog lijekova
        koji inhibiraju RAAS, stanje se naziva sindromom fetalne blokade RAAS-a.</p>
      <p>Taj sindrom u trudnoći nastaje znatno češće prilikom uzimanja blokatora AT1-receptora nego
        prilikom uporabe ACE-inhibitora. Opasnost od nastanka puno je veća kod izloženosti lijeku
        tijekom drugog i trećeg trimestra trudnoće (<xref rid="r79" ref-type="bibr">79</xref>).
        Nakon preživljenog rođenja najčešće posljedice ovog sindroma tijekom prvih pola godine
        života djeteta jesu zatajivanje funkcije bubrega (23%), arterijska hipertenzija (15%),
        proteinurija (15%), usporeni rast i nemogućnost normalnog napredovanja (15%), usporeni
        neurološki razvoj (12%), poliurija (12%), acidoza (8%) i policitemija (8%). Otprilike
        polovica djece izložena inhibitorima RAAS-a ima povoljnu dugoročnu prognozu, u polovice se
        razvije neki od spomenutih kroničnih poremećaja, a sveukupno oko 10% ima lošu prognozu koja
        uglavnom uključuje terminalno zatajenje funkcije bubrega (<xref rid="r79" ref-type="bibr"
          >79</xref>). Sindrom fetalne blokade RAAS-a može nastati i uporabom ACE-inhibitora tijekom
        prvog trimestra trudnoće kada, u odnosu prema neizloženoj djeci, postoji tri do četiri puta
        veća opasnost od nastanka prirođenih malformacija kardiovaskularnog i središnjega živčanog
        sustava (<xref rid="r80" ref-type="bibr">80</xref>).</p>
      <p>Opisana razdioba i učestalost prirođenih malformacija i poremećaja objašnjavaju se ulogom
        angiotenzina II tijekom intrauterinog razvoja djeteta. Za razliku od početka fetalnog
        razvoja, prema kraju trudnoće angiotenzin II postaje ključan za normalan razvoj bubrežnog
        sustava jer održava potreban protok krvi kroz bubrege i odgovarajuću glomerularnu filtraciju
        u sustavu s tada niskim perfuzijskim tlakom. Tada inhibicija RAAS-a može prouzročiti
        hipoperfuziju i ishemiju bubrega. Posljedično smanjenje glomerularne filtracije i smanjeno
        stvaranje mokraće mogu izazvati oligohidramnion i poremetiti razvoj tubularnog sustava. Time
        se ujedno objašnjava bolja ukupna prognoza u djece izložene inhibiciji RAAS-a samo tijekom
        prvog, a ne i tijekom ostala dva trimestra (<xref rid="r81" ref-type="bibr">81</xref> −
          <xref rid="r83" ref-type="bibr">83</xref>).</p>
      <p>Ne treba zanemariti mogućnost da prirođene malformacije nastaju ne samo zbog izloženosti
        ploda ACE-inhibitorima već barem dijelom i zbog prethodnih bolesti majke koje su razlog
        uključenja ACE-inhibitora u liječenje. Primjerice, pregestacijska šećerna bolest dva do tri
        puta povećava opasnost od nastanka prirođenih malformacija (<xref rid="r79" ref-type="bibr"
          >79</xref>). Nadalje, pretilost majke također je neovisni čimbenik opasnosti od nastanka
        razvojnih malformacija neuralne cijevi, kao i prirođenih srčanih mana (<xref rid="r84"
          ref-type="bibr">84</xref> − <xref rid="r86" ref-type="bibr">86</xref>). Sveukupno uzevši,
        žene u dobi u kojoj postoji mogućnost začeća trebale bi biti liječene ACE-inhibitorima i
        drugim lijekovima koji inhibiraju RAAS samo u slučajevima kada je to apsolutno indicirano, a
        tada bi trebale biti nedvosmisleno i temeljito upoznate s mogućim posljedicama te u dogovoru
        s liječnikom odlučiti o daljnjem liječenju.</p>
    </sec>
    <sec sec-type="conclusion">
      <label>ZAKLJUČAK</label>
      <p>ACE-inhibitori su važna skupina antihipertenzivnih lijekova koji se posljednja tri
        desetljeća rabe za liječenje povišenog arterijskog tlaka i povezanih kardiovaskularnih i
        metaboličkih poremećaja. To su zadovoljavajuće sigurni lijekovi koji, primijenjeni uz
        odgovarajuće mjere opreza, mogu, čini se, više od drugih antihipertenziva pridonijeti
        očuvanju funkcije organa, poboljšanju kvalitete života i ukupne prognoze. Korist od moguće
        organoprotekcije posebno valja očekivati u bolesnika sa srčanim zatajivanjem, koronarnom
        bolešću i nefropatijom kada su ACE-inhibitori antihipertenzivi prvog izbora. U bolesnica u
        kojih je nužno antihipertenzivno liječenje, a postoji mogućnost začeća, potrebna je
        temeljita procjena i poseban oprez pri/u uporabi ACE-inhibitora.</p>
    </sec>
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