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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-146-419</article-id>
<article-id pub-id-type="doi">10.26800/LV-146-11-12-7</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group>
</article-categories>
<title-group>
<article-title>U&#x010D;inak intravenske terapije teku&#x0107;inom na endotelnu disfunkciju u &#x017E;ivotno ugro&#x017E;enih bolesnika</article-title>
<trans-title-group xml:lang="en">
<trans-title>The effect of fluid therapy on endothelial dysfunction in critically ill patients</trans-title>
</trans-title-group>
</title-group>
<contrib-group>
<contrib contrib-type="author"><name><surname>Cofek</surname><given-names>Lea</given-names></name><xref ref-type="aff" rid="aff2"><sup>1</sup></xref><xref ref-type="aff" rid="aff1"><sup>#</sup></xref></contrib><contrib contrib-type="author"><name><surname>Kr&#x0161;ek</surname><given-names>Antea</given-names></name><xref ref-type="aff" rid="aff2"><sup>1</sup></xref><xref ref-type="aff" rid="aff1"><sup>#</sup></xref></contrib><contrib contrib-type="author"><name><surname>&#x0106;urko-Cofek</surname><given-names>Bo&#x017E;ena</given-names></name><xref ref-type="aff" rid="aff3"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Batinac</surname><given-names>Tanja</given-names></name><xref ref-type="aff" rid="aff4"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Kne&#x017E;evi&#x0107;</surname><given-names>Danijel</given-names></name><xref ref-type="aff" rid="aff5"><sup>4</sup></xref></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2645-5364</contrib-id><name><surname>Soto&#x0161;ek</surname><given-names>Vlatka</given-names></name><xref ref-type="aff" rid="aff5"><sup>4</sup></xref><xref ref-type="aff" rid="aff6"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Bati&#x010D;i&#x0107;</surname><given-names>Lara</given-names></name><xref ref-type="aff" rid="aff7"><sup>6</sup></xref></contrib>
<aff id="aff1"><label>#</label>autori su jednako pridonijeli u izradi rada</aff>
<aff id="aff2"><label>1</label><institution>Medicinski fakultet, Sveu&#x010D;ili&#x0161;te u Rijeci</institution>, <addr-line>Rijeka</addr-line></aff>
<aff id="aff3"><label>2</label><institution>Katedra za fiziologiju, imunologiju i patofiziologiju, Medicinski fakultet, Sveu&#x010D;ili&#x0161;te u Rijeci</institution>, <addr-line>Rijeka</addr-line></aff>
<aff id="aff4"><label>3</label><institution>Katedra za klini&#x010D;ke medicinske znanosti I, Fakultet zdravstvenih studija</institution>, <addr-line>Rijeka</addr-line></aff>
<aff id="aff5"><label>4</label><institution>Katedra za anesteziologiju, reanimatologiju, hitnu i intenzivnu medicinu, Medicinski fakultet, Sveu&#x010D;ili&#x0161;te u Rijeci</institution>, <addr-line>Rijeka</addr-line></aff>
<aff id="aff6"><label>5</label><institution>Katedra za klini&#x010D;ke medicinske znanosti II, Fakultet zdravstvenih studija</institution>, <addr-line>Rijeka</addr-line></aff>
<aff id="aff7"><label>6</label><institution>Katedra za medicinsku kemiju, biokemiju i klini&#x010D;ku kemiju, Medicinski fakultet, Sveu&#x010D;ili&#x0161;te u Rijeci</institution>, <addr-line>Rijeka</addr-line></aff>
</contrib-group>
<author-notes>
<corresp id="cor1">Adresa za dopisivanje: Prof. dr. sc. Vlatka Soto&#x0161;ek, dr. med.; <ext-link ext-link-type="uri" xlink:href="https://orcid.org/0000-0003-2645-5364">https://orcid.org/0000-0003-2645-5364</ext-link>, Katedra za anesteziologiju, reanimatologiju, hitnu i intenzivnu medicinu, Medicinski fakultet, Sveu&#x010D;ili&#x0161;te u Rijeci, Bra&#x0107;e Branchetta 20, 51000 Rijeka; Katedra za klini&#x010D;ke medicinske znanosti II, Fakultet zdravstvenih studija, Viktora Cara Emina 2, 51000 Rijeka; e-po&#x0161;ta: <email xlink:href="vlatkast@uniri.hr">vlatkast@uniri.hr</email></corresp>
<fn fn-type="con">
<p content-type="fn-title">DOPRINOS AUTORA</p>
<p>K<sc>oncepcija</sc> <sc>ili</sc> <sc>nacrt</sc> <sc>rada</sc>: B&#x0106;C, VS, LB</p>
<p>P<sc>rikupljanje</sc>, <sc>analiza</sc> <sc>i</sc> <sc>interpretacija</sc> <sc>podataka</sc>: &#x2013;</p>
<p>P<sc>isanje</sc> <sc>prve</sc> <sc>verzije</sc> <sc>rada</sc>: LC, AK, B&#x0106;C, TB, DK, VS, LB</p>
<p>K<sc>riti&#x010D;ka</sc> <sc>revizija</sc>: VS</p>
</fn>
</author-notes>
<pub-date date-type="pub" publication-format="electronic"><month>01</month><year>2025</year></pub-date>
<pub-date date-type="pub" publication-format="print"><month>01</month><year>2025</year></pub-date>
<volume>146</volume>
<issue>11-12</issue>
<fpage>419</fpage>
<lpage>428</lpage>
<permissions>
<copyright-statement>Croatian Medical Association</copyright-statement>
<copyright-year>2025</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>Terapije intravenskim teku&#x0107;inama primjenjuju se dulje od stotinu godina te predstavljaju jedan od naj&#x010D;e&#x0161;&#x0107;e provo&#x0111;enih postupaka u medicini, osobito u &#x017E;ivotno ugro&#x017E;enih bolesnika. Postoje&#x0107;a znanstvena saznanja ukazuju na razli&#x010D;it utjecaj intravenskih teku&#x0107;ina na endotel i endotelni glikokaliks (EG): s jedne strane odre&#x0111;ene otopine koje se koriste u resuscitaciji mogu doprinijeti regeneraciji integriteta EG-a i pobolj&#x0161;anju mikrocirkulacije te boljoj oksigenaciji stanica i tkiva, dok s druge strane odre&#x0111;ene otopine mogu pridonijeti razvoju endotelne disfunkcije te o&#x0161;te&#x0107;enju EG-a. Izrazito je va&#x017E;no poznavanje kompleksnosti mehanizama upravljanja intravenskom terapijom teku&#x0107;inama budu&#x0107;i da neodgovaraju&#x0107;a primjena ovog postupka mo&#x017E;e doprinijeti i nepovoljnom ishodu kod &#x017E;ivotno ugro&#x017E;enih bolesnika. Prilago&#x0111;en i individualiziran pristup intravenskoj terapiji teku&#x0107;inama, vo&#x0111;en neprekidnim pra&#x0107;enjem hemodinamike uz osobit fokus na karakteristike svakog bolesnika, klju&#x010D;an je u optimizaciji funkcije endotela te u kona&#x010D;nici pobolj&#x0161;anju ishoda intenzivnog lije&#x010D;enja. Cilj ovoga preglednog rada jest prikazati dosada&#x0161;nja saznanja o molekularnim mehanizmima, ali i klini&#x010D;kim saznanjima o utjecaju terapije intavenskim teku&#x0107;inama na endotel i EG. Razumijevanje slo&#x017E;enih interakcija izme&#x0111;u intravenske terapije teku&#x0107;inom i funkcije endotela mo&#x017E;e doprinijeti u&#x010D;inkovitijem lije&#x010D;enju &#x017E;ivotno ugro&#x017E;enih bolesnika te naposljetku boljem ishodu lije&#x010D;enja.</p>
</abstract>
<trans-abstract xml:lang="en">
<title>SUMMARY</title>
<p>Intravenous fluid therapies have been utilized for over a century and represent one of the most commonly performed procedures in medicine, particularly in critically ill patients. Current scientific knowledge points to the diverse effects of intravenous fluids on the endothelium and endothelial glycocalyx (EG): on the one hand, certain fluids used in resuscitation can contribute to EG integrity regeneration and improve microcirculation and tissue oxygenation, while on the other hand, specific fluids may contribute to the development of endothelial dysfunction and EG damage. Understanding the complexity of intravenous fluid therapy management is crucial as inappropriate administration of this procedure can lead to unfavorable outcomes in critically ill patients. A tailored and individualized approach to rehydration, guided by continuous hemodynamic monitoring with a particular focus on patient characteristics, is essential in optimizing endothelial function and ultimately, improving intensive care outcomes. The aim of this review is to present existing knowledge on the molecular mechanisms as well as clinical findings regarding the impact of intravenous fluid therapy on the endothelium and EG. Understanding the intricate interactions between intravenous fluid therapy and endothelial function can contribute to more effective care for critically ill patients and ultimately lead to better treatment outcomes.</p>
</trans-abstract>
<kwd-group kwd-group-type="author"><kwd>Deskriptori ENDOTELNE STANICE &#x2013; metabolizam, patologija</kwd><kwd>GLIKOKALIKS &#x2013; kemija, metabolizam, patologija</kwd><kwd>KRITI&#x010C;NA BOLEST &#x2013; lije&#x010D;enje</kwd><kwd>LIJE&#x010C;ENJE TEKU&#x0106;INOM &#x2013; metode, ne&#x017E;eljeni u&#x010D;inci</kwd><kwd>KRISTALOIDNE OTOPINE &#x2013; terapijska uporaba</kwd><kwd>KOLOIDI &#x2013; terapijska uporaba</kwd><kwd>ALBUMINI &#x2013; terapijska uporaba</kwd><kwd>SEPSA &#x2013; metabolizam, patologija</kwd><kwd>MIKROCIRKULACIJA</kwd><kwd>STANI&#x010C;NA ADHEZIJA</kwd><kwd>VASKULARNA PROPUSNOST</kwd></kwd-group>
<kwd-group kwd-group-type="translator" xml:lang="en"><title>Descriptors </title><kwd>ENDOTHELIAL CELLS &#x2013; metabolism, pathology</kwd><kwd>GLYCOCALYX &#x2013; chemistry, metabolism, pathology</kwd><kwd>CRITICAL ILLNESS &#x2013; therapy</kwd><kwd>FLUID THERAPY &#x2013; adverse effects, methods</kwd><kwd>CRYSTALLOD SOLUTIONS &#x2013; therapeutic use</kwd><kwd>COLLOIDS &#x2013; therapeutic use</kwd><kwd>ALBUMINS &#x2013; therapeutic use</kwd><kwd>SEPSIS &#x2013; metabolism, pathology</kwd><kwd>MICROCIRCULATION</kwd><kwd>CELL ADHESION</kwd><kwd>CAPILLARY PERMEABILITY</kwd></kwd-group>
</article-meta>
</front>
<body>
<p>Primjena intravenskih teku&#x0107;ina u klini&#x010D;koj je uporabi vi&#x0161;e od jednog stolje&#x0107;a. Njihova primjena podrazumijeva tri indikacije: resuscitaciju, nadoknadu i odr&#x017E;avanje. (<xref ref-type="bibr" rid="r1"><italic>1</italic></xref>) Resuscitacija intravenskim teku&#x0107;inama primjenjuje se zato da bi se nadoknadio intravenski deficit teku&#x0107;ina i lije&#x010D;ila akutna hipovolemija. Nadoknada intravenskim teku&#x0107;inama slu&#x017E;i za korekciju postoje&#x0107;eg ili prijete&#x0107;eg deficita koji se ne mo&#x017E;e nadoknaditi oralnom primjenom, dok se odr&#x017E;avanje odnosi na primjenu intravenskih teku&#x0107;ina u hemodinamski stabilnih bolesnika u kojih oralni unos teku&#x0107;ine nije dostatan za zadovoljavanje dnevnih potreba za vodom i elektrolitima. (<xref ref-type="bibr" rid="r2"><italic>2</italic></xref>) Osim svojih indikacija za primjenu, intravenske teku&#x0107;ine su lijek te je potrebno odrediti njihovu pravu dozu, trajanje i vrijeme deeskalacije njihove primjene. (<xref ref-type="bibr" rid="r3"><italic>3</italic></xref>) Krajnji cilj primjene intravenskih teku&#x0107;ina jest odr&#x017E;avanje prikladne perfuzije te dostave kisika i hranjivih tvari svim stanicama i tkivima. Iako terapija intravenskim teku&#x0107;inama mo&#x017E;e zna&#x010D;ajno pobolj&#x0161;ati mikrocirkulaciju i perfuziju, u posljednjih je nekoliko desetlje&#x0107;a u sredi&#x0161;tu pozornosti njihov u&#x010D;inak na endotel, endotelni glikokaliks (EG) i njegovu funkciju. Intravenske teku&#x0107;ine zna&#x010D;ajno utje&#x010D;u na strukturu i funkciju endotela, osobito u &#x017E;ivotno ugro&#x017E;enih bolesnika u kojih endotelna disfunkcija zna&#x010D;ajno doprinosi ishodu lije&#x010D;enja. (<xref ref-type="bibr" rid="r4"><italic>4</italic></xref>)</p>
<sec sec-type="other1">
<title>Gra&#x0111;a i funkcija entotelnog glikokaliksa</title>
<p>Sve krvne &#x017E;ile oblo&#x017E;ene su s luminalne strane jednim slojem endotelnih stanica koje su u neposrednom kontaktu s krvlju i predstavljaju barijeru izme&#x0111;u krvi i tkiva. Endotelne stanice imaju brojne funkcije, kao &#x0161;to je promet teku&#x0107;ina, otopljenih tvari, hormona, makromolekula i krvnih stanica izme&#x0111;u krvi i tkiva, ovisno o vrsti krvne &#x017E;ile i lokalizaciji. (<xref ref-type="bibr" rid="r5"><italic>5</italic></xref>) Stoga se &#x017E;ilni endotel smatra dinami&#x010D;nim organom koji ima metaboli&#x010D;ku i endokrinu ulogu, a odgovara na promjene u svojem okoli&#x0161;u i na stres te tako predstavlja va&#x017E;an &#x010D;imbenik u odr&#x017E;avanju homeostaze. (<xref ref-type="bibr" rid="r6"><italic>6</italic></xref>) Na apikalnoj (luminalnoj) strani, endotelne stanice su pokrivene strukturom koju nazivamo EG (<xref ref-type="fig" rid="f1">Figure 1</xref>). To je vi&#x0161;eslojna struktura slo&#x017E;ene makromolekularne gra&#x0111;e bogata ugljikohidratima koja &#x0161;titi endotelne stanice od izravnog kontakta s krvlju (<xref ref-type="bibr" rid="r7"><italic>7</italic></xref>) te od mehani&#x010D;kih i hemodinamskih sila (<xref ref-type="bibr" rid="r5"><italic>5</italic></xref>). Osnovnu strukturu EG-a &#x010D;ine proteoglikani, glikozaminoglikani (GAG) i glikoproteini. Proteoglikani mogu biti vezani za membranu endotelne stanice ili slobodni. Vezivanje za membranu mo&#x017E;e biti ostvareno na dva na&#x010D;ina. Jedan je preko transmembranske domene &#x010D;iji izvanstani&#x010D;ni dio ve&#x017E;e GAG-e, dok je citoplazmatski odsje&#x010D;ak povezan sa signalnim molekulama ili citoskeletom. (<xref ref-type="bibr" rid="r8"><italic>8</italic></xref>) Na taj se na&#x010D;in djelovanje izvanstani&#x010D;nih mehani&#x010D;kih sila prenosi na odgovaraju&#x0107;e strukture, kao &#x0161;to su dinamin, tubulin i sintenin, u unutra&#x0161;njosti stanice. (<xref ref-type="bibr" rid="r9"><italic>9</italic></xref>) Najzastupljeniji predstavnik ove skupine proteoglikana jest sindekan i to njegova izoforma sindekan-1 od &#x010D;etiri za sada poznate. (<xref ref-type="bibr" rid="r10"><italic>10</italic></xref>) Drugi je na&#x010D;in vezivanja za membranu preko glikozilfosfatidilinozitola, gdje je najzastupljeniji predstavnik glipikan. Na endotelnim stanicama nalazimo samo glipikan-1 izoformu (od &#x0161;est poznatih) &#x010D;ija je dominantna uloga moduliranje signalnih putova. (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>) Proteoglikani koji nisu izravno vezani za membranu, kao &#x0161;to je perlekan, ipak ostvaruju vezu s endotelnom membranom neizravnim putem ve&#x017E;u&#x0107;i se za GAG-e i membranske receptore. (<xref ref-type="bibr" rid="r12"><italic>12</italic></xref>) GAG-i, kao &#x0161;to su heparan sulfat, hondroitin sulfat i dermatan sulfat, jesu linearne polisaharidne molekule koje sadr&#x017E;e ponavljaju&#x0107;e disaharidne podjedinice. Naj&#x010D;e&#x0161;&#x0107;i me&#x0111;u GAG-ima je heparan sulfat koji se ve&#x017E;e na &#x010D;ak do 90% proteoglikana. (<xref ref-type="bibr" rid="r13"><italic>13</italic></xref>) Za razliku od njega, hijaluronan (hijaluronska kiselina), koji je najdulji GAG, ne ve&#x017E;e se na proteoglikane, nego na molekulu CD44 koja mu slu&#x017E;i kao membranski receptor. Tre&#x0107;a su skupina strukturnih molekula EG-a glikoproteini koji, za razliku od proteoglikana, imaju kratke, razgranate bo&#x010D;ne lance. Najzna&#x010D;ajniji su me&#x0111;u njima selektini i integrini koji pripadaju adhezijskim molekulama. Selektini su ushodno regulirani na endotelnim stanicama kada se pojavi upalni proces, a integrini povezuju izvanstani&#x010D;ni matriks i citoskelet te sudjeluju u signalnim putovima. (<xref ref-type="bibr" rid="r14"><italic>14</italic></xref>)</p>
<fig id="f1" position="float" fig-type="figure"><label>Figure 1</label><caption><p>Schematic representation of the structure of endothelial glycocalyx</p></caption><graphic xlink:href="LV-146-419-f1"></graphic></fig>
<p>Iako se dugo smatralo da je EG samo pasivna barijera, danas se zna da on sudjeluje u brojnim &#x017E;ilnim procesima. Prominiraju&#x0107;i u lumen &#x017E;ila, EG sudjeluje u procesima mehanosenzacije i mehanotransdukcije koji su izazvani tokom krvi i stresom smicanja koji on uzrokuje. Posljedica ovih procesa jest aktivacija sintaze endotelnog du&#x0161;ikovog oksida (eNOS, engl. <italic>endothelial nitric oxide synthase</italic>) koja poti&#x010D;e sintezu du&#x0161;ikova monoksida (NO, engl. <italic>nytric oxide</italic>), &#x0161;to ima za posljedicu opu&#x0161;tanje subendotelnoga glatkog mi&#x0161;i&#x0107;ja, odnosno vazodilataciju. (<xref ref-type="bibr" rid="r15"><italic>15</italic></xref>) Nadalje, EG predstavlja fizi&#x010D;ku prepreku za prodor patogena i drugih &#x0161;tetnih tvari iz krvotoka u tkiva, kako svojom gra&#x0111;om, tako i elektronegativno&#x0161;&#x0107;u jer ve&#x0107;ina bakterija i virusa ima negativno nabijenu povr&#x0161;inu. (<xref ref-type="bibr" rid="r16"><italic>16</italic></xref>, <xref ref-type="bibr" rid="r17"><italic>17</italic></xref>) U normalnim uvjetima sloj EG-a sprje&#x010D;ava i dodir trombocita s endotelnim stanicama te potencijalno stvaranje tromba. Ovaj u&#x010D;inak podr&#x017E;avaju pojedine molekule unutar EG-a, kao &#x0161;to su glipikan i heparan sulfat koji pokazuju visok afinitet vezivanja antitrombina III (<xref ref-type="bibr" rid="r12"><italic>12</italic></xref>), ali i vezivanje brojnih antikoagulacijskih molekula za EG, kao &#x0161;to su antitrombin, trombomodulin i protein C (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>). Jedna od prvih uloga EG-a koja je ustanovljena bio je utjecaj na propusnost krvnih &#x017E;ila jer se pokazalo da o&#x0161;te&#x0107;enje EG-a dovodi do pove&#x0107;ane propusnosti, prije svega kapilara (<xref ref-type="bibr" rid="r18"><italic>18</italic></xref>), ali i ve&#x0107;ih krvnih &#x017E;ila (<xref ref-type="bibr" rid="r19"><italic>19</italic></xref>). EG zbog svojih mehani&#x010D;kih i elektrostatskih osobina ote&#x017E;ava prolaz velikim i negativno nabijenim molekulama; &#x0161;to su molekule ve&#x0107;e i ja&#x010D;e negativno nabijene, te&#x017E;e prolaze kroz membranu endotelnih stanica. (<xref ref-type="bibr" rid="r14"><italic>14</italic></xref>) Ograni&#x010D;avaju&#x0107;i na taj na&#x010D;in prolaz razli&#x010D;itih molekula, uklju&#x010D;uju&#x0107;i i proteine plazme, EG zna&#x010D;ajno pridonosi odre&#x0111;ivanju neto filtracijskog tlaka i veli&#x010D;ine filtracije teku&#x0107;ine. (<xref ref-type="bibr" rid="r20"><italic>20</italic></xref>)</p>
</sec>
<sec sec-type="other2">
<title>Promjene endotela u &#x017E;ivotno ugro&#x017E;enih bolesnika</title>
<p>U &#x017E;ivotno ugro&#x017E;enih bolesnika, osobito onih s te&#x0161;kom traumom ili sepsom, dolazi do o&#x0161;te&#x0107;enja endotela krvnih &#x017E;ila. (<xref ref-type="bibr" rid="r21"><italic>21</italic></xref>) Osobito je o&#x0161;te&#x0107;enju podlo&#x017E;an EG, stoga &#x0161;to je u izravnom dodiru sa strujom krvi. Djelovanjem upalnih posrednika, enzima i reaktivnih kisikovih radikala (ROS, engl. <italic>reactive oxygen species</italic>) gubi se za&#x0161;titna barijera koju &#x010D;ini EG te dolazi do njegove degradacije, pove&#x0107;ava se propusnost krvnih &#x017E;ila (<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>), izra&#x017E;aj adhezijskih molekula poti&#x010D;e stvaranje ugru&#x0161;aka (<xref ref-type="bibr" rid="r23"><italic>23</italic></xref>, <xref ref-type="bibr" rid="r24"><italic>24</italic></xref>) te se gubi sposobnost regulacije vaskularnog tonusa (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>).</p>
<p>U stanjima akutne ozljede ili upale, degradaciju EG-a prati <italic>shedding</italic> ili odbacivanje jedne ili vi&#x0161;e komponenata EG-a u krvotok, &#x010D;ime se naru&#x0161;ava njegov integritet. (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>) Pokazalo se da o&#x0161;te&#x0107;enje EG-a rezultira pove&#x0107;anjem vaskularne propusnosti i izra&#x017E;aja adhezijskih molekula (<xref ref-type="bibr" rid="r26"><italic>26</italic></xref>), stvaraju&#x0107;i podlogu za nastanak edema i ugru&#x0161;aka. Plazmatska koncentracija nekih od gradivnih komponenti EG-a, kao &#x0161;to su sindekan-1, heparan sulfat i hijaluronska kiselina, ukazuje na stanje EG-a i njegovo o&#x0161;te&#x0107;enje te se zato koriste kao biomarkeri ozljede glikokaliksa. (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>, <xref ref-type="bibr" rid="r27"><italic>27</italic></xref>) No, otpu&#x0161;tanje komponenti glikokaliksa u cirkulaciju mo&#x017E;e imati i ulogu propagatora upale. Neke molekule, kao &#x0161;to su heparan sulfat i hijaluronska kiselina, mogu se pona&#x0161;ati kao alarmini te aktivacijom leukocita i endotelnih stanica i stimulacijom lu&#x010D;enja citokina potaknuti daljnji razvoj upale. (<xref ref-type="bibr" rid="r26"><italic>26</italic></xref>, <xref ref-type="bibr" rid="r28"><italic>28</italic></xref>) Heparanaze, matriks metaloproteinaze (MMP), &#x010D;imbenik tumorske nekroze-alfa (TNF-&#x03B1;, engl. <italic>tumor necrosis factor alpha</italic>) i ROS predstavljaju glavne &#x010D;imbenike zaslu&#x017E;ne za cijepanje komponenata EG-a. Mastociti su jedne od stanica koje otpu&#x0161;taju enzim heparanazu koja razgra&#x0111;uje heparan sulfat (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>, <xref ref-type="bibr" rid="r29"><italic>29</italic></xref>), dok neutrofili proizvode ROS (<xref ref-type="bibr" rid="r29"><italic>29</italic></xref>, <xref ref-type="bibr" rid="r30"><italic>30</italic></xref>) koji predstavljaju glavni izvor neenzimskog o&#x0161;te&#x0107;enja EG-a i izravno o&#x0161;te&#x0107;uju glikokaliks cijepaju&#x0107;i heparan sulfat i hijaluronsku kiselinu (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>). ROS tako&#x0111;er potenciraju i proteolizu EG-a aktivacijom MMP-a, koje pokazuju veliki afinitet za sindekan-1, te inaktivacijom endogenih inhibitora proteaza. (<xref ref-type="bibr" rid="r30"><italic>30</italic></xref>) Proupalni citokin TNF-&#x03B1; stimulira leukocite na otpu&#x0161;tanje slobodnih radikala i proteaza, a mastocite na osloba&#x0111;anje citokina i enzima, kao &#x0161;to je heparanaza. (<xref ref-type="bibr" rid="r31"><italic>31</italic></xref>) Uz navedene posredne u&#x010D;inke, TNF-&#x03B1; aktivira MMP-9 koja pove&#x0107;ava odbacivanje heparan sulfata i sindekana iz EG-a u krv. (<xref ref-type="bibr" rid="r32"><italic>32</italic></xref>)</p>
<p>O&#x0161;te&#x0107;enjem endotela pove&#x0107;ava se propusnost stijenke krvnih &#x017E;ila koja u normalnim uvjetima omogu&#x0107;uje normalnu izmjenu teku&#x0107;ine i makromolekula izme&#x0111;u lumena krvne &#x017E;ile i intersticija. (<xref ref-type="bibr" rid="r33"><italic>33</italic></xref>, <xref ref-type="bibr" rid="r34"><italic>34</italic></xref>) Kod intaktnog endotela, s o&#x010D;uvanim EG-om, izvanstani&#x010D;nim matriksom i me&#x0111;ustani&#x010D;nim vezama, odr&#x017E;ana je endotelna barijera i normalna propusnost krvnih &#x017E;ila. (<xref ref-type="bibr" rid="r34"><italic>34</italic></xref>) Ako do&#x0111;e do o&#x0161;te&#x0107;enja endotelnih stanica i poreme&#x0107;aja njihove funkcije, smanjuje se raspolo&#x017E;ivost NO-a, pove&#x0107;ano je stvaranje ROS-a i aktiviraju se enzimi za degradaciju EG-a. (<xref ref-type="bibr" rid="r35"><italic>35</italic></xref>) Prisutnost ROS-a mo&#x017E;e potaknuti i neenzimsku, a prisutnost hijaluronidaze enzimsku razgradnju hijaluronana. On je iznimno va&#x017E;an za odr&#x017E;avanje ograni&#x010D;ene propusnosti &#x017E;ilne stijenke jer prije&#x010D;i prolaz nekih proteina i makromolekula te stvara onkoti&#x010D;ki gradijent usmjeren prema lumenu &#x017E;ile. (<xref ref-type="bibr" rid="r25"><italic>25</italic></xref>) O&#x0161;te&#x0107;enjem EG-a remeti se kretanje teku&#x0107;ine kroz stijenke krvnih &#x017E;ila. Dolazi do ekstravazacije makromolekula, &#x0161;to rezultira poreme&#x0107;ajem transendotelnog gradijenta tlaka i pomakom teku&#x0107;ine iz &#x017E;ile u intersticij, odnosno nastankom edema. (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>) Aktivacijom endotelnih stanica dolazi do otpu&#x0161;tanja proteina kao &#x0161;to su interleukini i angiopoetin (Ang)-2 (<xref ref-type="bibr" rid="r36"><italic>36</italic></xref>) te velike koli&#x010D;ine proupalnih citokina, &#x010D;ime se poti&#x010D;e razvoj upale (<xref ref-type="bibr" rid="r37"><italic>37</italic></xref>). Ang-2 je u normalnim uvjetima potisnut s Ang-1, ali u upali dolazi do njegova pove&#x0107;anog izra&#x017E;aja, &#x0161;to uzrokuje pove&#x0107;anu propusnost endotela. (<xref ref-type="bibr" rid="r38"><italic>38</italic></xref>) Djelovanjem TNF-&#x03B1; i drugih upalnih posrednika dolazi do pucanja me&#x0111;ustani&#x010D;nih veza, poticanja paracelularnog transporta te pove&#x0107;anja vaskularne propusnosti. (<xref ref-type="bibr" rid="r39"><italic>39</italic></xref>, <xref ref-type="bibr" rid="r40"><italic>40</italic></xref>) Uz paracelularni transport, upalni posrednici poti&#x010D;u nastanak kaveola pa tako dovode i do transcelularnog transporta. Oba na&#x010D;ina kretanja vode i makromolekula rezultiraju smanjenjem koncentracije proteina plazme te pojavom intersticijskog edema. (<xref ref-type="bibr" rid="r41"><italic>41</italic></xref>)</p>
<p>Endotel krvnih &#x017E;ila, a osobito EG, u normalnim okolnostima imaju antitromboti&#x010D;ko djelovanje kojim pridonose odr&#x017E;avanju normalnog protoka krvi. EG prekriva adhezijske molekule koje se nalaze na povr&#x0161;ini endotelnih stanica i sprje&#x010D;ava njihovu aktivaciju. (<xref ref-type="bibr" rid="r41"><italic>41</italic></xref>, <xref ref-type="bibr" rid="r42"><italic>42</italic></xref>) Endotel lu&#x010D;i razli&#x010D;ite antikoagulacijske molekule kao &#x0161;to su NO, prostaciklin i inhibitor tkivnog puta (TFPI, engl. <italic>tissue factor pathway inhibitor</italic>) (<xref ref-type="bibr" rid="r43"><italic>43</italic></xref>), a uz to lu&#x010D;i i heparan sulfat koji osna&#x017E;uje inhibiciju trombina i faktora koagulacije IXa, Xa i XIa (<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>), a ve&#x017E;e se i na pozitivno nabijene regije antitrombina poja&#x010D;avaju&#x0107;i njegovu antikoagulacijsku funkciju (<xref ref-type="bibr" rid="r44"><italic>44</italic></xref>, <xref ref-type="bibr" rid="r45"><italic>45</italic></xref>). U &#x017E;ivotno ugro&#x017E;enih bolesnika karakteristike endotela se mijenjaju i on poprima protromboti&#x010D;ka svojstva. (<xref ref-type="bibr" rid="r24"><italic>24</italic></xref>) Izlaganje upalnim posrednicima uni&#x0161;tava EG enzimima i ROS-om, &#x010D;ime se otkrivaju do tada skrivene adhezijske molekule kao &#x0161;to su selektini i integrini i izravno se izla&#x017E;u cirkulaciji, tj. krvnim stanicama. (<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>) Adhezijske molekule olak&#x0161;avaju interakcije ligand &#x2013; receptor koje poti&#x010D;u stvaranje ugru&#x0161;ka. (<xref ref-type="bibr" rid="r41"><italic>41</italic></xref>) Pove&#x0107;ano vezivanje trombocita za endotel dovodi do aktivacije endotelnih stanica, a posljedi&#x010D;no i do aktivacije leukocita i komplementa, &#x010D;ime se poti&#x010D;e upala. (<xref ref-type="bibr" rid="r22"><italic>22</italic></xref>) Na povr&#x0161;ini aktiviranih endotelnih stanica dolazi do izra&#x017E;aja tkivni faktor koji pokre&#x0107;e kaskadu unutra&#x0161;njeg puta zgru&#x0161;avanja krvi koja izme&#x0111;u ostalog rezultira aktivacijom trombocita, &#x010D;ime se formira za&#x010D;arani krug hiperkoagulabilnosti. (<xref ref-type="bibr" rid="r46"><italic>46</italic></xref>) S druge strane, o&#x0161;te&#x0107;enjem EG-a dolazi do odbacivanja njegovih gradivnih komponenti, me&#x0111;u kojima su i antikoagulantne molekule. One ulaze u sustavnu cirkulaciju pa mogu pridonijeti generaliziranoj hipokoagulabilnosti koja se javlja kod oboljelih od sepse (<xref ref-type="bibr" rid="r47"><italic>47</italic></xref>) i te&#x0161;kih trauma (<xref ref-type="bibr" rid="r48"><italic>48</italic></xref>) kao nastavak na period hiperkoagulabilnosti (<xref ref-type="bibr" rid="r49"><italic>49</italic></xref>).</p>
<p>Dodatno na endotel i EG utje&#x010D;u intravenske teku&#x0107;ine koje zna&#x010D;ajno mijenjaju tijek lije&#x010D;enja &#x017E;ivotno ugro&#x017E;enih bolesnika.</p>
</sec>
<sec sec-type="other3">
<title>Utjecaj intravenskih teku&#x0107;ina na endotel i EG</title>
<sec>
<title>Utjecaj kristaloidnih i koloidnih intravenskih teku&#x0107;ina na EG</title>
<p>Iako se intravenske teku&#x0107;ine primjenjuju dulje od stolje&#x0107;a kao jedan od naj&#x010D;e&#x0161;&#x0107;ih postupaka u medicini, idealna intravenska teku&#x0107;ina ne postoji i tek posljednjih godina znanstvenici i klini&#x010D;ari prihva&#x0107;aju &#x010D;injenicu da je primjenu intravenskih teku&#x0107;ina potrebno tretirati kao primjenu lijekova (<xref ref-type="bibr" rid="r40"><italic>40</italic></xref>, <xref ref-type="bibr" rid="r50"><italic>50</italic></xref>) s indikacijama, kontraindikacijama i mogu&#x0107;im komplikacijama (<xref ref-type="bibr" rid="r50"><italic>50</italic></xref>&#x2013;<xref ref-type="bibr" rid="r52"><italic>52</italic></xref>).</p>
<p>Recentne studije pokazuju da neke otopine koje se primjenjuju u resuscitaciji doprinose regeneraciji integriteta EG-a i pobolj&#x0161;avaju mikrocirkulaciju. (<xref ref-type="bibr" rid="r11"><italic>11</italic></xref>, <xref ref-type="bibr" rid="r53"><italic>53</italic></xref>) Kod primjene teku&#x0107;ine potrebno je primijeniti pravilo 4D: &#x201E;<italic>Drugs &#x2013; Dosing &#x2013; Duration &#x2013; De-escalation</italic>&#x201C; te je va&#x017E;no vrijeme i trajanje primjene, volumen i brzina primjene teku&#x0107;ine, vrsta primijenjene teku&#x0107;ine, kao i pravodobni prekid primjene. (<xref ref-type="bibr" rid="r54"><italic>54</italic></xref>&#x2013;<xref ref-type="bibr" rid="r57"><italic>57</italic></xref>) U usporedbi s ranom primjenom teku&#x0107;ine, primjena infuzije u kasnom stadiju mo&#x017E;e imati &#x0161;tetne posljedice. (<xref ref-type="bibr" rid="r53"><italic>53</italic></xref>) Nadoknada intravenske teku&#x0107;ine mo&#x017E;e uzrokovati ijatrogeno o&#x0161;te&#x0107;enje endotela koji prati porast heparan sulfata za svaku litru primijenjene intravenske teku&#x0107;ine. (<xref ref-type="bibr" rid="r58"><italic>58</italic></xref>) Dokazi na pretklini&#x010D;kim modelima podr&#x017E;avaju hipotezu da brza intravenska primjena teku&#x0107;ine mo&#x017E;e uzrokovati o&#x0161;te&#x0107;enje EG-a. (<xref ref-type="bibr" rid="r59"><italic>59</italic></xref>&#x2013;<xref ref-type="bibr" rid="r61"><italic>61</italic></xref>) Mogu&#x0107;i mehanizmi nastanka o&#x0161;te&#x0107;enja EG-a uklju&#x010D;uju hemodiluciju, smi&#x010D;ni tlak te otpu&#x0161;tanje natriuretskog peptida koji mo&#x017E;e aktivirati MMP-e na povr&#x0161;ini EG-a. (<xref ref-type="bibr" rid="r62"><italic>62</italic></xref>, <xref ref-type="bibr" rid="r63"><italic>63</italic></xref>) O&#x0161;te&#x0107;enje EG-a uslijed hipervolemije povezuje se s otpu&#x0161;tanjem natriuretskog peptida. (<xref ref-type="bibr" rid="r64"><italic>64</italic></xref>) Primjena velikog volumena teku&#x0107;ine tijekom resuscitacije pove&#x0107;ava o&#x0161;te&#x0107;enje EG-a (<xref ref-type="bibr" rid="r60"><italic>60</italic></xref>) te je u pretklini&#x010D;koj studiji Byrne i suradnika pokazano da o&#x0161;te&#x0107;enje EG-a ovisi o dozi intravenske teku&#x0107;ine (<xref ref-type="bibr" rid="r54"><italic>54</italic></xref>). Oscilacijski smi&#x010D;ni tlak tijekom intravenske infuzije mo&#x017E;e izravno o&#x0161;tetiti EG (<xref ref-type="bibr" rid="r60"><italic>60</italic></xref>), iako u novijim istra&#x017E;ivanjima nije dokazana razlika izme&#x0111;u brze i polagane intravenske primjene infuzije (<xref ref-type="bibr" rid="r61"><italic>61</italic></xref>, <xref ref-type="bibr" rid="r65"><italic>65</italic></xref>). Dodatno, pokazalo se da spora primjena intravenske infuzije ne smanjuje mortalitet tijekom 90 dana u usporedbi s brzom primjenom infuzije. (<xref ref-type="bibr" rid="r66"><italic>66</italic></xref>) Recentni sustavni pregled studija pokazao je trend povezanosti odnosa brzine i volumena primjene intravenske teku&#x0107;ine i o&#x0161;te&#x0107;enja EG-a u stabilnih bolesnika, dok takva tendencija nije na&#x0111;ena u bolesnika sa sepsom ili &#x017E;ivotno ugro&#x017E;enih bolesnika. (<xref ref-type="bibr" rid="r67"><italic>67</italic></xref>)</p>
<p>Osnovni princip primjene teku&#x0107;ine preporu&#x010D;uje poslijeoperacijski pristup &#x201E;<italic>zero balance</italic>&#x201C; u svih bolesnika, uz odr&#x017E;avanje sredi&#x0161;nje euvolemije i izbjegavanje hipervolemije. Pokazalo se da u komparaciji s &#x201E;liberalnim&#x201C; pristupom restrikcijska primjena teku&#x0107;ine djeluje za&#x0161;titno na EG te smanjuje poslijeoperacijski morbiditet i trajanje hospitalizacije. (<xref ref-type="bibr" rid="r68"><italic>68</italic></xref>&#x2013;<xref ref-type="bibr" rid="r70"><italic>70</italic></xref>)</p>
<p>Razli&#x010D;ite intravenske teku&#x0107;ine mogu imati razli&#x010D;ito djelovanje na EG. Teku&#x0107;ine za intravensku primjenu u klini&#x010D;koj praksi dijele se na kristaloidne i koloidne teku&#x0107;ine. (<xref ref-type="bibr" rid="r71"><italic>71</italic></xref>&#x2013;<xref ref-type="bibr" rid="r73"><italic>73</italic></xref>) Kristaloidne teku&#x0107;ine su intravenske otopine koje sadr&#x017E;e vodu, elektrolite i/ili neelektrolitne tvari koje mogu dospjeti u sve teku&#x0107;e odjeljke u tijelu te, u usporedbi s plazmom, mogu biti izotoni&#x010D;ne, hipertoni&#x010D;ne i hipotoni&#x010D;ne. (<xref ref-type="bibr" rid="r72"><italic>72</italic></xref>, <xref ref-type="bibr" rid="r73"><italic>73</italic></xref>) Ve&#x0107;ina kristaloidnih otopina su izotoni&#x010D;ne, uklju&#x010D;uju&#x0107;i balansirane kristaloidne otopine i fiziolo&#x0161;ku otopinu. Glavne razlike izme&#x0111;u fiziolo&#x0161;ke otopine i drugih kristaloidnih otopina jesu prisutnost dodatnih aniona u Ringerovoj otopini i otopini Plasmalyte<sup>&#x00AE;</sup> te relativni vi&#x0161;ak iona klorida u fiziolo&#x0161;koj otopini. (<xref ref-type="bibr" rid="r71"><italic>71</italic></xref>, <xref ref-type="bibr" rid="r74"><italic>74</italic></xref>) Primjena ve&#x0107;e koli&#x010D;ine fiziolo&#x0161;ke otopine mo&#x017E;e uzrokovati acidozu, obi&#x010D;no samoograni&#x010D;avaju&#x0107;u, ali treba imati na umu i druge mogu&#x0107;e ne&#x017E;eljene pojave kao &#x0161;to su ekspanzija izvanstani&#x010D;ne teku&#x0107;ine, aktivacija trombocita, smanjena sinteza trombina i renalna disfunkcija. (<xref ref-type="bibr" rid="r71"><italic>71</italic></xref>&#x2013;<xref ref-type="bibr" rid="r75"><italic>75</italic></xref>)</p>
<p>Koloidne teku&#x0107;ine su otopine tvari visoke molekularne te&#x017E;ine u kristaloidnoj otopini, koje se inicijalno zadr&#x017E;avaju uglavnom u intravaskularnom prostoru stvaraju&#x0107;i onkotski tlak. Koloidne otopine mogu biti prirodnog podrijetla, kao albumin i plazma, ili sintetske koloidne teku&#x0107;ine kao derivat amilopektina, hidroksietil&#x0161;krob (HES, engl. <italic>hydroxyethyl starch</italic>), derivati &#x017E;elatine ili dekstran. (<xref ref-type="bibr" rid="r74"><italic>74</italic></xref>, <xref ref-type="bibr" rid="r76"><italic>76</italic></xref>)</p>
<p>Neke su se studije bavile pitanjem primjene kristaloidnih ili koloidnih otopina te vrste koloidne otopine koju treba primijeniti u lije&#x010D;enju &#x0161;oka. Studija SALT, provedena u odjelu hitnog prijma na bolesnicima koji nisu &#x017E;ivotno ugro&#x017E;eni, nije potvrdila razliku u hospitalizaciji izme&#x0111;u bolesnika lije&#x010D;enih balansiranim kristaloidnim otopinama ili fiziolo&#x0161;kom otopinom. (<xref ref-type="bibr" rid="r77"><italic>77</italic></xref>) Studija SPLIT u bolesnika u jedinicama intenzivne medicine koji su primali kristaloidnu otopinu nije utvrdila razliku u u&#x010D;estalosti akutne bubre&#x017E;ne ozljede kod primjene balansirane slane otopine ili fiziolo&#x0161;ke otopine. (<xref ref-type="bibr" rid="r78"><italic>78</italic></xref>) Studija SMART je utvrdila da primjena kristaloidnih otopina, u odnosu na primjenu fiziolo&#x0161;ke otopine, u &#x017E;ivotno ugro&#x017E;enih bolesnika smanjuje smrtnost bilo kojeg uzroka, u&#x010D;estalost primjene dijalize ili trajne bubre&#x017E;ne disfunkcije. (<xref ref-type="bibr" rid="r79"><italic>79</italic></xref>) U studiji CRISTAL, provedenoj u &#x017E;ivotno ugro&#x017E;enih bolesnika sa simptomima hipovolemijskog &#x0161;oka, nije utvr&#x0111;ena razlika u 28-dnevnom mortalitetu ili potrebi za dijalizom kod primjene kristaloidnih ili koloidnih otopina, iako je 90-dnevni mortalitet bio ni&#x017E;i u koloidnoj skupini. (<xref ref-type="bibr" rid="r80"><italic>80</italic></xref>) Tako&#x0111;er, studija CHEST nije potvrdila razliku u 90-dnevnom mortalitetu izme&#x0111;u &#x017E;ivotno ugro&#x017E;enih bolesnika lije&#x010D;enih fiziolo&#x0161;kom otopinom i 6% HES, ali je vi&#x0161;e bolesnika na terapiji HES zahtijevalo dijalizu. (<xref ref-type="bibr" rid="r81"><italic>81</italic></xref>) Lewis i suradnici u sustavnom su pregledu revidirali 69 randomiziranih kontroliranih studija koje su uspore&#x0111;ivale primjenu koloidnih i kristaloidnih teku&#x0107;ina u bolesnika sa &#x0161;okom te su utvrdili umjereno sigurne dokaze da nema razlike u mortalitetu nakon 90 dana kod primjene derivata &#x0161;kroba, albumina, svje&#x017E;e smrznute plazme (SSP) ili kristaloida. (<xref ref-type="bibr" rid="r82"><italic>82</italic></xref>) Utvr&#x0111;eno je da postoje umjereno sigurni dokazi da primjena derivata &#x0161;kroba pove&#x0107;ava potrebu za transfuzijom krvi i nesigurni dokazi da primjena albumina, SSP-a i kristaloidnih teku&#x0107;ina pove&#x0107;ava potrebu za primjenom transfuzije u bolesnika. Dodatno, na&#x0111;eni su dokazi vrlo niskog stupnja sigurnosti da primjena derivata &#x0161;kroba uzrokuje alergijsku reakciju. (<xref ref-type="bibr" rid="r83"><italic>83</italic></xref>)</p>
</sec>
<sec>
<title>Utjecaj kristaloidnih teku&#x0107;ina na EG</title>
<p>Primjena velike koli&#x010D;ine fiziolo&#x0161;ke otopine mo&#x017E;e uzrokovati hipernatrijemiju, metaboli&#x010D;ku acidozu i poreme&#x0107;aj renalne funkcije. (<xref ref-type="bibr" rid="r73"><italic>73</italic></xref>, <xref ref-type="bibr" rid="r76"><italic>76</italic></xref>) Semler i suradnici su pokazali da je primjena fiziolo&#x0161;ke otopine, u odnosu na primjenu kristaloida, u &#x017E;ivotno ugro&#x017E;enih bolesnika povezana s porastom akutne bubre&#x017E;ne ozljede i lo&#x0161;ijom prognozom. (<xref ref-type="bibr" rid="r79"><italic>79</italic></xref>) Druga studija u bolesnika koji nisu &#x017E;ivotno ugro&#x017E;eni na&#x0161;la je da je primjena fiziolo&#x0161;ke otopine povezana sa zna&#x010D;ajnom bubre&#x017E;nom disfunkcijom unutar 30 dana, u usporedbi s kristaloidima. (<xref ref-type="bibr" rid="r75"><italic>75</italic></xref>) Suprotno navedenim studijama, Alves i suradnici nisu utvrdili razliku izme&#x0111;u primjene fiziolo&#x0161;ke otopine ili kristaloidnih otopina u &#x017E;ivotno ugro&#x017E;enih bolesnika. (<xref ref-type="bibr" rid="r66"><italic>66</italic></xref>) U svinja s hemoragijskim &#x0161;okom, Cheung-Flynn i suradnici pokazali su da primjena fiziolo&#x0161;ke otopine doprinosi o&#x0161;te&#x0107;enju EG-a u usporedbi s primjenom balansirane kristaloidne teku&#x0107;ine (<italic>Plasma-Lyte</italic>). Isti u&#x010D;inak potvr&#x0111;en je <italic>in vitro</italic> na humanim endotelnim stanicama izlo&#x017E;enim djelovanju TNF-a i inkubiranim s fiziolo&#x0161;kom ili koloidnom otopinom. (<xref ref-type="bibr" rid="r83"><italic>83</italic></xref>) Na ov&#x010D;jem modelu endotoksemije Byrne i suradnici na&#x0161;li su da fiziolo&#x0161;ka otopina uzrokuje o&#x0161;te&#x0107;enje EG-a. (<xref ref-type="bibr" rid="r54"><italic>54</italic></xref>) Torres i suradnici su na modelu hemoragijskog &#x0161;oka u &#x0161;takora na&#x0161;li da je primjena fiziolo&#x0161;ke otopine, u odnosu na primjenu Ringerove otopine, 5% albumina i SSP, u zna&#x010D;ajnijoj korelaciji s o&#x0161;te&#x0107;enjem EG-a. Dodatno, pokazano je da primjena balansiranih kristaloidnih otopina ima superioran u&#x010D;inak u odnosu na fiziolo&#x0161;ku otopinu u prevenciji o&#x0161;te&#x0107;enja EG-a (<xref ref-type="bibr" rid="r84"><italic>84</italic></xref>), ali niti jedna ne uzrokuje regeneraciju i pove&#x0107;anje debljine EG-a, ve&#x0107; obje otopine uzrokuju pove&#x0107;anu vaskularnu permeabilnost. Martin i suradnici predlo&#x017E;ili su da je o&#x0161;te&#x0107;enje EG-a uzrokovano fiziolo&#x0161;kom otopinom posljedica hipernatrijemije. (<xref ref-type="bibr" rid="r85"><italic>85</italic></xref>) Za razliku od navedenih studija, Ergin i suradnici te Guerci i suradnici na&#x0161;li su da i balansirane kristaloidne otopine i fiziolo&#x0161;ka otopina uzrokuju o&#x0161;te&#x0107;enje EG-a u studijama na &#x017E;ivotinjama. (<xref ref-type="bibr" rid="r58"><italic>58</italic></xref>, <xref ref-type="bibr" rid="r86"><italic>86</italic></xref>) Na modelu hemoragijskog &#x0161;oka u psa, Smart i suradnici su utvrdili da primjena velikog volumena kristaloida uzrokuje porast osipanja EG-a i izra&#x017E;eniju upalnu reakciju nego ostale teku&#x0107;ine. (<xref ref-type="bibr" rid="r26"><italic>26</italic></xref>) Trenutne smjernice preporu&#x010D;uju primjenu kristaloidnih otopina, uglavnom balansiranih kristaloida, kao terapiju prvog izbora u bolesnika sa sepsom te primjenu albumina u kombinaciji s kristaloidima u slu&#x010D;aju da je u bolesnika potrebna nadoknada velikog volumena kristaloidne teku&#x0107;ine. (<xref ref-type="bibr" rid="r87"><italic>87</italic></xref>)</p>
</sec>
<sec>
<title>Utjecaj koloidnih teku&#x0107;ina na endotelni glikokaliks</title>
<p>Smjernice ne preporu&#x010D;uju primjenu koloidnih otopina kao prvog izbora za nadoknadu teku&#x0107;ine zbog potencijalnih ozbiljnih komplikacija, posebno ne HES. (<xref ref-type="bibr" rid="r87"><italic>87</italic></xref>) Studije ukazuju da primjena HES-a u po&#x010D;etnoj nadoknadi teku&#x0107;ine mo&#x017E;e uzrokovati akutnu bubre&#x017E;nu ozljedu (<xref ref-type="bibr" rid="r88"><italic>88</italic></xref>) uslijed sni&#x017E;ene glomerularne filtracije i upalnih promjena u intersticiju kao posljedice visokog onkotskog tlaka otopine HES (<xref ref-type="bibr" rid="r89"><italic>89</italic></xref>). Primjena HES-a povezuje se i s poreme&#x0107;ajem koagulacije, dijelom zbog hemodilucije, dijelom zbog utjecaja faktora VIII, faktora XIII i von Willebrandovog faktora. (<xref ref-type="bibr" rid="r90"><italic>90</italic></xref>) &#x017D;elatina mo&#x017E;e uzrokovati alergijske reakcije, dok se dekstran rijetko primjenjuje zbog mogu&#x0107;ih komplikacija kao &#x0161;to su poreme&#x0107;aj koagulacije, akutna bubre&#x017E;na ozljeda i alergija. (<xref ref-type="bibr" rid="r91"><italic>91</italic></xref>) Usprkos potencijalnim ozbiljnim komplikacijama primjene koloidnih otopina, novije studije ukazuju na zna&#x010D;ajan za&#x0161;titni u&#x010D;inak koloidnih otopina na EG. Tako su Ergin i suradnici u studiji na modelu hemoragijskog &#x0161;oka u &#x0161;takora utvrdili da HES u&#x010D;inkovitije djeluje na o&#x010D;uvanje integriteta EG-a. (<xref ref-type="bibr" rid="r58"><italic>58</italic></xref>) Studija Zhao i suradnika potvrdila je za&#x0161;titno djelovanje HES-a na EG koje se povezuje sa sni&#x017E;enim izra&#x017E;ajem heparinaze, hijaluronidaze i neuraminidaze. (<xref ref-type="bibr" rid="r92"><italic>92</italic></xref>) Smart, et al. pokazali su na pse&#x0107;em modelu hemoragijskog &#x0161;oka da nadoknada teku&#x0107;ine primjenom HES-a, u usporedbi s primjenom SSP-a, zna&#x010D;ajno smanjuje koncentraciju hijaluronana u plazmi dvadeset minuta nakon primjene, ukazuju&#x0107;i na za&#x0161;titni i obnavljaju&#x0107;i u&#x010D;inak HES-a na EG, dok primjena 4% sukcinilirane &#x017E;elatine uzrokuje porast koncentracije hijaluronana u plazmi. (<xref ref-type="bibr" rid="r59"><italic>59</italic></xref>) Li i suradnici su predlo&#x017E;ili za&#x0161;titno djelovanje primjene 6% HES-a i albumina na integritet EG-a u bolesnika pri operaciji mozga. (<xref ref-type="bibr" rid="r93"><italic>93</italic></xref>) Kaneko i suradnici su utvrdili da primjena HES-a u bolesnika na abdominalnoj operaciji ne pogor&#x0161;ava o&#x0161;te&#x0107;enje EG-a. (<xref ref-type="bibr" rid="r94"><italic>94</italic></xref>) Studije koje istra&#x017E;uju u&#x010D;inak ostalih koloidnih otopina na EG-u su malobrojne te jasan zaklju&#x010D;ak o potencijalnim u&#x010D;incima dekstrana i &#x017E;elatine na EG nije mogu&#x0107;e iznijeti. (<xref ref-type="bibr" rid="r59"><italic>59</italic></xref>)</p>
</sec>
<sec>
<title>Utjecaj albumina na EG</title>
<p>Albumin u plazmi &#x010D;ini oko 50% ukupnih proteina te pokazuje brojne biolo&#x0161;ke funkcije. Predstavlja 66 kDa protein, visoko topljiv u vodi, s niskim intrizni&#x010D;kim viskozitetom. (<xref ref-type="bibr" rid="r95"><italic>95</italic></xref>) Normalna koncentracija albumina u serumu iznosi oko 40 g/L. Osim &#x0161;to sudjeluje u regulaciji osmotskog tlaka, zbog &#x010D;ega se &#x010D;esto primjenjuje u lije&#x010D;enju &#x017E;ivotno ugro&#x017E;enih bolesnika sa svrhom plazma ekspandera, &#x010D;esto se primjenjuje kod gubitka cirkuliraju&#x0107;eg volumena i tijekom nadoknade kod hipoalbuminemije. Osim toga, albumini imaju ulogu u pobolj&#x0161;anju endotelnog integriteta, modulaciji stvaranja NO, inhibiciji apoptoze endotelnih stanica, stvaranju upalnih posrednika i regulaciji acido-bazne ravnote&#x017E;e. (<xref ref-type="bibr" rid="r96"><italic>96</italic></xref>, <xref ref-type="bibr" rid="r97"><italic>97</italic></xref>)</p>
<p>Albumin smanjuje o&#x0161;te&#x0107;enje EG-a tijekom hladne ishemije i reperfuzije smanjuju&#x0107;i propusnost endotela, pospje&#x0161;uju&#x0107;i izlazak teku&#x0107;ine u me&#x0111;ustani&#x010D;ni prostor i stvaranje edema. (<xref ref-type="bibr" rid="r98"><italic>98</italic></xref>) Smatra se da albumin u interakciji s hijaluronom EG-a pove&#x0107;ava integritet EG-a na takav na&#x010D;in da inhibira cijepanje MMP-om i posljedi&#x010D;no o&#x0161;te&#x0107;enje EG-a. (<xref ref-type="bibr" rid="r99"><italic>99</italic></xref>) Albumin inhibira apoptozu endotelnih stanica putem fosfoinozitol-3-kinaze ovisnim putem, modulira osloba&#x0111;anje arahidonske kiseline i sudjeluje u odstranjivanu ROS-a. Nadalje, potiskuje aktivnost angiotenzin-konvertiraju&#x0107;eg enzima, pove&#x0107;ava koncentraciju Ang-1 i Ang-2 koji doprinose integritetu EG-a. (<xref ref-type="bibr" rid="r95"><italic>95</italic></xref>) Albumin zna&#x010D;ajno doprinosi inhibiciji aktivacije nuklearnog &#x010D;imbenika kB, ovisno o dozi, smanjuju&#x0107;i lu&#x010D;enje protuupalnih posrednika te ograni&#x010D;ava stvaranje ROS-a ve&#x017E;u&#x0107;i se za slobodni bakar koji zna&#x010D;ajno poja&#x010D;ava njihovo stvaranje. (<xref ref-type="bibr" rid="r100"><italic>100</italic></xref>) Usprkos brojnim istra&#x017E;ivanjima, do sada nisu provedena kontrolirana randomizirana istra&#x017E;ivanja koja bi pokazala zna&#x010D;ajnu prednost primjene otopine albumina nad ostalim intravenskim teku&#x0107;inama u resuscitaciji &#x017E;ivotno ugro&#x017E;enih bolesnika. Istra&#x017E;ivanje Frennete i suradnika pokazalo je da intravenska primjena albumina mo&#x017E;e dovesti do akutne bubre&#x017E;ne ozljede u kardiokirur&#x0161;kih bolesnika (<xref ref-type="bibr" rid="r101"><italic>101</italic></xref>), dok je istra&#x017E;ivanje Myburgh i suradnika pokazalo da mali volumeni otopine albumina mogu biti sigurni u lije&#x010D;enju bolesnika u jedinicama intenzivne medicine, osobito kardiokirur&#x0161;kih bolesnika u kojih imaju pozitivan utjecaj na hemodinamsku stabilnost bolesnika i integritet EG-a. (<xref ref-type="bibr" rid="r102"><italic>102</italic></xref>) ALBIOS, jedna od najve&#x0107;ih studija o utjecaju albumina na ishod lije&#x010D;enja u bolesnika sa sepsom i septi&#x010D;nim &#x0161;okom, pokazala je nekoliko pozitivnih u&#x010D;inaka primjene albumina, ali ne i pobolj&#x0161;anje ishoda lije&#x010D;enja. (<xref ref-type="bibr" rid="r103"><italic>103</italic></xref>)</p>
</sec>
</sec>
<sec sec-type="other4">
<title>Mogu&#x0107;nosti o&#x010D;uvanja integriteta endotela i EG-a</title>
<p>O&#x010D;uvanje integriteta endotela klju&#x010D;no je za odr&#x017E;avanje vaskularnog integriteta i smanjenja rizika povezanih s endotelnom disfunkcijom.</p>
<p>Brojna istra&#x017E;ivanja u ovom podru&#x010D;ju isti&#x010D;u niz potencijalnih metodologija za o&#x010D;uvanje integriteta endotela kroz optimizaciju i terapeutske intervencije, svaka dizajnirana ciljano za razli&#x010D;ite mehanizme endotelne disfunkcije. Ove metode su klju&#x010D;ne ne samo za sprje&#x010D;avanje pojave bolesti, ve&#x0107; i za zaustavljanje napredovanja postoje&#x0107;ih vaskularnih o&#x0161;te&#x0107;enja. Fokusiranjem na pobolj&#x0161;anje otpornosti endotelnog sloja kroz unaprije&#x0111;ene terapijske pristupe i promjene u na&#x010D;inu &#x017E;ivota, postoji potencijal za zna&#x010D;ajno reduciranje kardiovaskularnih bolesti. (<xref ref-type="bibr" rid="r104"><italic>104</italic></xref>, <xref ref-type="bibr" rid="r105"><italic>105</italic></xref>)</p>
<p>Jedno zna&#x010D;ajno podru&#x010D;je fokusa u trenutnim istra&#x017E;ivanjima jest razumijevanje molekularnih i stani&#x010D;nih putova koji grade temelj zdravlja endotelnih stanica. To uklju&#x010D;uje regulaciju eNOS-a, koji je klju&#x010D;an za odr&#x017E;avanje ravnote&#x017E;e vaskularnog tonusa i protoka krvi. (<xref ref-type="bibr" rid="r106"><italic>106</italic></xref>) Drugi klju&#x010D;an &#x010D;imbenik jest kontrola oksidacijskog stresa, koji mo&#x017E;e dovesti do o&#x0161;te&#x0107;enja endotela ako se ne kontrolira. U novije vrijeme identificiraju se novi terapijski ciljevi koji mogu dovesti do u&#x010D;inkovitijih tretmana za o&#x010D;uvanje integriteta endotela. Kako bi se o&#x010D;uvao integritet endotela i EG-a, va&#x017E;no je razumjeti mehanizme i dijagnosticirati njegovo o&#x0161;te&#x0107;enje. Osobito je va&#x017E;no razviti dijagnosti&#x010D;ke mjere koje mogu procijeniti endotelnu funkciju u stvarnom vremenu, kao &#x0161;to je videomikroskopija koja omogu&#x0107;uje vizualizaciju mre&#x017E;e kapilara te mjerenje protoka krvi u njima i odre&#x0111;ivanje koncentracije biomarkera o&#x0161;te&#x0107;enja EG-a. Takav dijagnosti&#x010D;ki napredak omogu&#x0107;uje rano otkrivanje endotelne disfunkcije, pru&#x017E;aju&#x0107;i priliku za pravovremenu intervenciju koja bi mogla odgoditi ili sprije&#x010D;iti pojavu uznapredovale i te&#x0161;ke vaskularne bolesti.</p>
<p>Uloga teku&#x0107;ina i albumina u o&#x010D;uvanju integriteta endotela klju&#x010D;na je u odr&#x017E;avanju strukture i funkcije endotela. (<xref ref-type="bibr" rid="r96"><italic>96</italic></xref>) Terapija teku&#x0107;inama, posebno kod &#x017E;ivotno ugro&#x017E;enih bolesnika, od osobite je va&#x017E;nosti jer izravno utje&#x010D;e na ishod njihovog lije&#x010D;enja. Izbor teku&#x0107;ina za reanimaciju mo&#x017E;e zna&#x010D;ajno utjecati na integritet EG-a. Razli&#x010D;ite teku&#x0107;ine, poput albumina i SSP-a, pokazale su razli&#x010D;ite stupnjeve u&#x010D;inkovitosti na o&#x010D;uvanje EG-a. (<xref ref-type="bibr" rid="r107"><italic>107</italic></xref>) Albumin je pokazao superiornije u&#x010D;inke u smanjenju vaskularne propusnosti i za&#x0161;titi EG-a u usporedbi s HES-om. (<xref ref-type="bibr" rid="r108"><italic>108</italic></xref>) Ova za&#x0161;tita EG-a vjerojatno proizlazi iz sposobnosti albumina da odr&#x017E;ava koloidni osmotski tlak, &#x010D;ime se sprje&#x010D;ava curenje teku&#x0107;ine u tkiva i o&#x010D;uvanje strukturalnog integriteta EG-a. Za razliku od toga, sinteti&#x010D;ki koloidi mogu naru&#x0161;iti strukturu EG-a ili kroz izravnu interakciju ili mijenjanjem hemodinamskih parametara koji optere&#x0107;uju endotel. (<xref ref-type="bibr" rid="r53"><italic>53</italic></xref>)</p>
<p>Albumini ne samo da poma&#x017E;u u odr&#x017E;avanju koloidnog osmotskog tlaka plazme, ve&#x0107; igraju ulogu i u modulaciji upalnog odgovora te odr&#x017E;avanju acido-bazne ravnote&#x017E;e. (<xref ref-type="bibr" rid="r109"><italic>109</italic></xref>, <xref ref-type="bibr" rid="r110"><italic>110</italic></xref>) Ova sposobnost obnove albumina djelomi&#x010D;no se pripisuje njegovoj ulozi u regulaciji upalnog odgovora i vaskularne propusnosti. (<xref ref-type="bibr" rid="r111"><italic>111</italic></xref>) Osim toga, u&#x010D;inkovitost albumina u obnovi EG-a dokazana je u razli&#x010D;itim istra&#x017E;ivanjima na &#x017E;ivotinjama. Na primjer, pokazalo se da albumin smanjuje plazmatske koncentracije sindekana-1, biomarkera degradacije EG-a, na po&#x010D;etne razine i pobolj&#x0161;ava vaskularnu propusnost. (<xref ref-type="bibr" rid="r112"><italic>112</italic></xref>) To nagla&#x0161;ava potencijal albumina ne samo u reanimaciji intravenskim teku&#x0107;inama, ve&#x0107; i u pobolj&#x0161;anju otpornosti endotelne barijere na teku&#x0107;e izazove u &#x017E;ivotno ugro&#x017E;enih bolesnika. (<xref ref-type="bibr" rid="r113"><italic>113</italic></xref>) Unato&#x010D; svojim povoljnim u&#x010D;incima na EG, primjena optimalnih volumena i doza otopina albumina jo&#x0161; uvijek se treba istra&#x017E;iti.</p>
</sec>
<sec sec-type="other5">
<title>Zaklju&#x010D;ak</title>
<p>Intravenske teku&#x0107;ine primjenjuju se dulje od stolje&#x0107;a kao jedan od naj&#x010D;e&#x0161;&#x0107;ih medicinskih postupaka. Me&#x0111;utim, primjena intravenskih teku&#x0107;ina mo&#x017E;e zna&#x010D;ajno utjecati na integritet, strukturu i funkciju endotela i EG-a te mo&#x017E;e imati osobito sna&#x017E;an utjecaj na endotelnu disfunkciju u &#x017E;ivotno ugro&#x017E;enih bolesnika. Odgovaraju&#x0107;a primjena intravenskih teku&#x0107;ina igra klju&#x010D;nu ulogu u smanjivanju endotelne disfunkcije, koja je &#x010D;esto uklju&#x010D;ena u patogenezu razli&#x010D;itih komplikacija kod &#x017E;ivotno ugro&#x017E;enih bolesnika. Intravenskim teku&#x0107;inama mo&#x017E;e se i pobolj&#x0161;ati funkcija endotela, uslijed odr&#x017E;avanja optimalnih hemodinamskih parametara, &#x0161;to se mo&#x017E;e pripisati obnavljanju mikrocirkulacijske perfuzije, potencijalno posredovano pobolj&#x0161;anom dostavom kisika stanicama i tkivima te smanjenim lu&#x010D;enjem upalnih posrednika. Stoga je izrazito va&#x017E;no poznavanje kompleksnosti intravenske terapije teku&#x0107;inama s obzirom na to da neodgovaraju&#x0107;a primjena intravenskih teku&#x0107;ina mo&#x017E;e doprinijeti nepovoljnom ishodu kod &#x017E;ivotno ugro&#x017E;enih bolesnika. Prilago&#x0111;en i individualiziran pristup rehidraciji, vo&#x0111;en neprekidnim pra&#x0107;enjem hemodinamike uz osobit fokus na osobitosti svakog bolesnika, klju&#x010D;an je u optimizaciji funkcije endotela te u kona&#x010D;nici pobolj&#x0161;anju ishoda intenzivnog lije&#x010D;enja. Potrebna su daljnja znanstvena i klini&#x010D;ka istra&#x017E;ivanja kako bi se razjasnile optimalne strategije primjene intravenskih teku&#x0107;ina koje ne poti&#x010D;u endotelnu disfunkciju, uz minimiziranje rizika povezanih s preoptere&#x0107;enjem ili deplecijom teku&#x0107;ine. Razumijevanje slo&#x017E;enih interakcija izme&#x0111;u intravenske terapije teku&#x0107;inom i funkcije endotela doprinijet &#x0107;e u&#x010D;inkovitom lije&#x010D;enju &#x017E;ivotno ugro&#x017E;enih bolesnika te naposljetku boljem ishodu lije&#x010D;enja.</p>
</sec>
</body>
<back>
<fn-group>
<fn fn-type="conflict">
<p content-type="fn-title">INFORMACIJE O SUKOBU INTERESA</p>
<p>Autori nisu deklarirali sukob interesa relevantan za ovaj rad.</p>
</fn>
<fn fn-type="financial-disclosure">
<p content-type="fn-title">INFORMACIJA O FINANCIRANJU</p>
<p>Za ovaj &#x010D;lanak nisu primljena financijska sredstva.</p>
</fn>
</fn-group>
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