{"id":11385590,"date":"2013-05-15T00:00:00","date_gmt":"2013-05-14T22:00:00","guid":{"rendered":"https:\/\/alertdiver.eu\/uncategorized-cs_cz\/moznosti-predchazet-riziko-dekompresniho-onemocneni\/"},"modified":"2013-05-15T00:00:00","modified_gmt":"2013-05-14T22:00:00","slug":"moznosti-predchazet-riziko-dekompresniho-onemocneni","status":"publish","type":"post","link":"https:\/\/alertdiver.eu\/cs_CZ\/clanky\/moznosti-predchazet-riziko-dekompresniho-onemocneni\/","title":{"rendered":"Mo\u017enosti p\u0159edch\u00e1zet riziko dekompresn\u00edho onemocn\u011bn\u00ed"},"content":{"rendered":"<p style=\"text-align: justify;\">V\u0161eobecn\u011b se uzn\u00e1v\u00e1, \u017ee nejz\u00e1va\u017en\u011bj\u0161\u00edmi rizikov\u00fdmi faktory pro dekompresn\u00ed onemocn\u011bn\u00ed (DCI) jsou trv\u00e1n\u00ed a hloubka ponoru. Pot\u00e1p\u011b\u010de tak\u00e9 velmi zaj\u00edm\u00e1, jak mohou sn\u00ed\u017eit nebezpe\u010d\u00ed DCI nap\u0159. fyzick\u00e1 p\u0159ipravenost a stav hydratace. V tomto \u010dl\u00e1nku se pokus\u00edme zjistit, zdali existuj\u00ed n\u011bjak\u00e9 specifick\u00e9 preventivn\u00ed metody, kter\u00e9 by mohli pot\u00e1p\u011b\u010di pou\u017e\u00edvat, aby p\u0159ipravili sv\u016fj organismus na podm\u00ednky vyvol\u00e1vaj\u00edc\u00ed dekompresn\u00ed onemocn\u011bn\u00ed. Zeptali jsme se na to odborn\u00edk\u016f.<\/p>\n<p style=\"text-align: justify;\"><strong>P\u0159evl\u00e1d\u00e1 n\u00e1zor, \u017ee v obdob\u00ed pot\u00e1p\u011bn\u00ed by se m\u011bli pot\u00e1p\u011b\u010di sp\u00ed\u0161e vyh\u00fdbat fyzicky n\u00e1ro\u010dn\u00fdm \u010dinnostem, ale z\u00e1rove\u0148 se tvrd\u00ed, \u017ee ur\u010dit\u00e1 t\u011blesn\u00e1 cvi\u010den\u00ed mohou sni\u017eovat riziko DCI. Jak tedy m\u016f\u017ee fyzick\u00e1 aktivita zvy\u0161ovat nebo sni\u017eovat nebezpe\u010d\u00ed DCI a co byste pot\u00e1p\u011b\u010d\u016fm v souvislosti s fyzickou z\u00e1t\u011b\u017e\u00ed a pot\u00e1p\u011bn\u00edm radili? <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Constantino Balestra:<\/strong> St\u00e1le v\u00edce v\u00fdzkum\u016f vyzdvihuje kladn\u00fd p\u0159\u00ednos fyzick\u00e9 p\u0159\u00edpravy p\u0159ed pot\u00e1p\u011bn\u00edm. Pro\u010d a jak dalece to spolu souvis\u00ed se sice je\u0161t\u011b nev\u00ed, ale kl\u00ed\u010dem k pochopen\u00ed se zd\u00e1 b\u00fdt prost\u011b &ldquo;pohyb&rdquo;. Hlavn\u00ed v\u00fdhodou je z\u0159ejm\u011b intenz\u00edvn\u011bj\u0161\u00ed sou\u010dinnost srdce, c\u00e9vn\u00ed soustavy a lymfatick\u00e9ho ob\u011bhu.<\/p>\n<p style=\"text-align: justify;\"><strong>Michael Bennett:<\/strong> Vztah mezi fyzick\u00fdm cvi\u010den\u00edm a pot\u00e1p\u011bn\u00edm se stal v n\u011bkolika posledn\u00edch letech st\u0159edem pozornosti. Tradi\u010dn\u011b se tvrdilo, \u017ee fyzick\u00e1 n\u00e1maha p\u0159ed pot\u00e1p\u011bn\u00edm zvy\u0161uje riziko onemocn\u011bn\u00ed DCI; vych\u00e1zelo se p\u0159itom z p\u0159edpokladu zv\u00fd\u0161en\u00e9 absorpce tk\u00e1\u0148ov\u00e9ho dus\u00edku kv\u016fli &nbsp;hyperdynamick\u00e9 cirkulaci. Nejnov\u011bj\u0161\u00ed poznatky v\u0161ak ukazuj\u00ed, \u017ee takov\u00e9 n\u00e1zory jsou p\u0159\u00edli\u0161 zjednodu\u0161uj\u00edc\u00ed. V\u00fdzkumy na zv\u00ed\u0159atech i u lid\u00ed nazna\u010duj\u00ed, \u017ee jednor\u00e1zov\u00e9 m\u00edrn\u00e9 a\u017e n\u00e1ro\u010dn\u00e9 fyzick\u00e9 cvi\u010den\u00ed 2 a\u017e 24 hodin p\u0159ed simulovan\u00fdm ponorem m\u016f\u017ee sn\u00ed\u017eit tvorbu bublinek (a prav\u011bpodobn\u011b riziko DCI). Sice nen\u00ed dosud jasn\u00e9 pro\u010d, ale zd\u00e1 se, \u017ee tvorba oxidu dusnat\u00e9ho (NO) b\u011bhem fyzick\u00e9 z\u00e1t\u011b\u017ee m\u016f\u017ee p\u0159\u00edzniv\u011b ovlivnit eliminaci jader, kolem kter\u00fdch se tvo\u0159\u00ed bublinky nebo pozm\u011bnit bu\u0148ky, kter\u00e9 pokr\u00fdvaj\u00ed vnit\u0159n\u00ed povrch krevn\u00edch c\u00e9v (endotel, v\u00fdstelku). Ale existuje \u0159ada dal\u0161\u00edch alternativn\u00edch hypot\u00e9z, kter\u00e9 jsou v sou\u010dasnosti p\u0159edm\u011btem intenzivn\u00edho v\u00fdzkumu. Jean-Eric Blatteau a jeho kolegov\u00e9 se nap\u0159. domn\u00edvaj\u00ed, \u017ee ochrann\u00fd \u00fa\u010dinek je v\u00fdsledkem m\u00edrn\u00e9 hypovolemie (sn\u00ed\u017een\u00ed objemu tekutiny v krevn\u00edm \u0159e\u010di\u0161ti). Vzhledem k sou\u010dasn\u00e9mu stavu v\u011bdy si dovoluji odpov\u011bdn\u011b tvrdit, \u017ee neexistuje d\u016fkaz o \u0161kodlivosti fyzick\u00e9 z\u00e1t\u011b\u017ee p\u0159ed pot\u00e1p\u011bn\u00edm, pokud k n\u00ed nedojde pozd\u011bji ne\u017e dv\u011b hodiny p\u0159ed ponorem, ale tak\u00e9 pot\u00e1p\u011b\u010d\u016fm fyzickou aktivitu p\u0159ed pot\u00e1p\u011bn\u00edm p\u0159\u00edmo nedoporu\u010duji. &nbsp;<\/p>\n<p style=\"text-align: justify;\">Mnohem m\u00e9n\u011b sporn\u00e9 jsou dopady a \u00fa\u010dinky fyzick\u00e9 z\u00e1t\u011b\u017ee na riziko DCI v jin\u00fdch \u010dasov\u00fdch \u00fasec\u00edch. V\u011bt\u0161\u00ed n\u00e1maha p\u0159\u00edmo b\u011bhem ponoru zvy\u0161uje absorpci dus\u00edku a jeho distribuci do tk\u00e1n\u00ed, co\u017e se pova\u017euje za zv\u00fd\u0161en\u00e9 nebezpe\u010d\u00ed, zat\u00edmco lehk\u00e1 n\u00e1maha b\u011bhem dekomprese se doporu\u010duje kv\u016fli uvol\u0148ov\u00e1n\u00ed plyn\u016f a s t\u00edm souvisej\u00edc\u00edm sn\u00ed\u017een\u00edm nebezpe\u010d\u00ed. K n\u00e1ro\u010dn\u00e9 fyzick\u00e9 z\u00e1t\u011b\u017ei po ukon\u010den\u00ed ponoru by naopak doch\u00e1zet nem\u011blo, nebo\u0165 p\u0159i n\u00ed existuje mo\u017enost podpory tvorby bublinek mechanickou stimulac\u00ed.<\/p>\n<p style=\"text-align: justify;\"><strong>Alf Brubakk:<\/strong> Pravideln\u00e1 fyzick\u00e1 n\u00e1maha se pot\u00e1p\u011b\u010d\u016fm doporu\u010duje. Aerobn\u00ed cvi\u010den\u00ed p\u0159ed pot\u00e1p\u011bn\u00edm sni\u017euje tvorbu vaskul\u00e1rn\u00edch bublinek. Cvi\u010den\u00ed po pot\u00e1p\u011bn\u00ed m\u016f\u017ee tvorbu bublinek zv\u00fd\u0161it nebo sn\u00ed\u017eit; \u00fa\u010dinky budou z\u00e1viset na v\u0161eobecn\u00e9 t\u011blesn\u00e9 zdatnosti. Zde se v\u0161ak jedn\u00e1 o oblast, kde chyb\u00ed dostatek informac\u00ed, aby se dalo n\u011bco radit a doporu\u010dit jednozna\u010dn\u011b.<\/p>\n<p style=\"text-align: justify;\"><strong>V\u011bt\u0161ina odborn\u00edk\u016f se shoduje, \u017ee siln\u00e1 dehydratace m\u016f\u017ee zv\u00fd\u0161it riziko DCI, ale z\u00e1rove\u0148 se tvrd\u00ed, \u017ee m\u00edrn\u00e1 dehydratace toto riziko sni\u017euje. Co si o tom mysl\u00edte a jak by se podle v\u00e1s m\u011bli pot\u00e1p\u011b\u010di v tomto sm\u011bru chovat? <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Balestra:<\/strong> Existuj\u00ed n\u00e1zory, \u017ee b\u011bhem ponoru m\u016f\u017ee norm\u00e1ln\u00ed objem krevn\u00ed plazmy nebo dokonce jej\u00ed m\u00edrn\u011b sn\u00ed\u017een\u00fd objem redukovat nasycov\u00e1n\u00ed tk\u00e1n\u00ed dus\u00edkem. Z toho plyne ponau\u010den\u00ed nenavy\u0161ovat objem plazmy p\u0159\u00edli\u0161 rychle ani p\u0159\u00edli\u0161 mnoho, nebo\u0165 to vede k vy\u0161\u0161\u00ed produkci mo\u010di a tk\u00e1n\u011b se vlastn\u011b nezavod\u0148uj\u00ed. Doporu\u010duji vyp\u00edt jednu sklenici vody ka\u017ed\u00fdch 15 a\u017e 20 minut, aby se tk\u00e1n\u011b zavod\u0148ovaly bez zv\u011bt\u0161ov\u00e1n\u00ed objemu plazmy.<\/p>\n<p style=\"text-align: justify;\"><strong>Bennett:<\/strong> N\u011bkter\u00e9 pr\u00e1ce zam\u011b\u0159en\u00e9 na zkoum\u00e1n\u00ed \u00fa\u010dink\u016f tepla a fyzick\u00e9 n\u00e1mahy na riziko n\u00e1sledn\u00e9ho vzniku dekompresn\u00edho onemocn\u011bn\u00ed nazna\u010duj\u00ed, \u017ee m\u00edrn\u00e1 dehytratace m\u016f\u017ee paradoxn\u011b p\u016fsobit preventivn\u00edm zp\u016fsobem. M\u016f\u017ee to b\u00fdt zp\u016fsobeno mechanismem, kter\u00fd podle proveden\u00e9ho v\u00fdzkumu poskytuje ochranu proti tvorb\u011b bublinek. Blatteau a spol. toti\u017e tvrd\u00ed, \u017ee m\u00edrn\u00e1 dehydratace a sn\u00ed\u017een\u00fd objem krve (hypovolemie) n\u00e1sledkem fyzick\u00e9ho cvi\u010den\u00ed nebo vystaven\u00ed se teplu p\u0159ed ponorem (nap\u0159. v saun\u011b) sni\u017euj\u00ed srde\u010dn\u00ed v\u00fddej a t\u00edm i dod\u00e1vku dus\u00edku do tk\u00e1n\u00ed. Na tento n\u00e1zor v\u0161ak existuje mnoho protich\u016fdn\u00fdch teori\u00ed a j\u00e1 s\u00e1m nezn\u00e1m \u017e\u00e1dn\u00e9 konkr\u00e9tn\u00ed \u00fadaje, kter\u00e9 by shora uveden\u00e9 tvrzen\u00ed dokazovaly.<\/p>\n<p style=\"text-align: justify;\">Shora zm\u00edn\u011bn\u00e9 tvrzen\u00ed je v\u0161ak dosti p\u0159ekvapiv\u00e9. I kdy\u017e rizika spojen\u00e1 s dehydrataci se mus\u00ed teprve potvrdit a p\u0159esn\u011b definovat, v\u0161e, co je n\u00e1m dosud zn\u00e1mo, ukazuje na skute\u010dnost, \u017ee tekutiny p\u0159ed ponorem jsou sp\u00ed\u0161e ku prosp\u011bchu ne\u017e ku \u0161kod\u011b. Nap\u0159. Gempp a spol. v roce 2008 zve\u0159ejnili zpr\u00e1vu z klinick\u00e9ho v\u00fdzkumu, jej\u00ed\u017e z\u00e1v\u011br zn\u011bl: &ldquo;Peror\u00e1ln\u00ed hydratace p\u0159ed ponorem sni\u017euje cirkulaci bublinek a proto nab\u00edz\u00ed pom\u011brn\u011b snadn\u00fd zp\u016fsob, jak sn\u00ed\u017eit nebezpe\u010d\u00ed dekompresn\u00edho onemocn\u011bn\u00ed.&rdquo; Podle jejich zpr\u00e1vy hydratace pomoc\u00ed 1,3 litr\u016f sm\u011bsi fyziologick\u00e9ho roztoku a roztoku gluk\u00f3zy p\u0159ed ponorem zm\u00edrnila dehydrataci a zabr\u00e1nila vzniku hypovolemie vyvolan\u00e9 pot\u00e1p\u011bn\u00edm, ale nezm\u011bnila povrchov\u00e9 nap\u011bt\u00ed plazmy. M\u00e1 rada je tedy jednozna\u010dn\u00e1: Na z\u00e1klad\u011b dosavadn\u00edch poznatk\u016f pot\u00e1p\u011b\u010d\u016fm doporu\u010duji, aby si p\u0159ed ponorem zajistili dostate\u010dnou hydrataci a jsou-li dehydratov\u00e1ni, rad\u011bji se nepot\u00e1p\u011bli.&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Brubakk:<\/strong> Nezn\u00e1m \u017e\u00e1dn\u00e9 konkr\u00e9tn\u00ed \u00fadaje, kter\u00e9 by potvrzovaly teorii, \u017ee m\u00edrn\u00e1 dehydratace je pro pot\u00e1p\u011bn\u00ed v\u00fdhodn\u00e1. I j\u00e1 pot\u00e1p\u011b\u010d\u016fm rad\u00edm, aby se p\u0159i v\u0161ech \u010dinnostech souvisej\u00edc\u00edch s pot\u00e1p\u011bn\u00edm udr\u017eovali v dob\u0159e hydratovan\u00e9m stavu.<\/p>\n<p style=\"text-align: justify;\"><strong>N\u011bkte\u0159\u00ed odborn\u00edci doporu\u010duj\u00ed p\u0159ed ponorem u\u017e\u00edvat antioxidanty (nap\u0159. vitamin C), nutrienty nebo l\u00e9ky (nap\u0159. nitroglycerin), aby se co nejv\u00edce minimalizovalo nebezpe\u010d\u00ed DCI. Jak to m\u016f\u017ee sn\u00ed\u017eit takov\u00e9 riziko?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Balestra:<\/strong> Zku\u0161enosti prokazuj\u00ed, \u017ee tento p\u0159\u00edstup sice nijak v\u00fdznamn\u011b neovliv\u0148uje produkci bublinek, ale m\u00e1 dopad na endoteli\u00e1ln\u00ed funkci. Bezprost\u0159edn\u011b po ponoru, kdy je endoteli\u00e1ln\u00ed funkce p\u0159echodn\u011b naru\u0161ena, mohou antioxidanty takov\u00e9mu zhor\u0161en\u00e9mu stavu zabr\u00e1nit, ale neexistuje \u017e\u00e1dn\u00fd jasn\u00fd d\u016fkaz, \u017ee zm\u00edn\u011bn\u00e9 p\u0159\u00edpravky redukuj\u00ed produkci bublinek. V\u00fdzkumy v t\u00e9to oblasti v\u0161ak st\u00e1le prob\u00edhaj\u00ed.<\/p>\n<p style=\"text-align: justify;\"><strong>Bennett:<\/strong> V posledn\u00ed dob\u011b jsme sv\u011bdky rostouc\u00edch snah o upravov\u00e1n\u00ed endoteli\u00e1ln\u00ed funkce farmakologick\u00fdmi prost\u0159edky. Nejv\u011bt\u0161\u00ed z\u00e1jem vyvol\u00e1vaj\u00ed p\u0159\u00edpravky, kter\u00e9 zvy\u0161uj\u00ed dostupnost NO a tud\u00ed\u017e p\u0159\u00edm\u00fd dopad na m\u00edsta (pravd\u011bpodobn\u011b na endotelu), kde se tvo\u0159\u00ed plynov\u00e9 bublinky. Tvorba bublinek z\u0159ejm\u011b zp\u016fsobuje po\u0161kozen\u00ed endotelu a podporuje mikrovaskul\u00e1rn\u00ed obstrukci i aktivaci koagula\u010dn\u00edch kask\u00e1d &ndash; co\u017e jsou zm\u011bny, kter\u00e9 mohou b\u00fdt p\u0159\u00edmo odpov\u011bdn\u00e9 za klinick\u00fd obraz DCI. I kdy\u017e zat\u00edm nelze \u010dinit n\u011bjak\u00e9 definitivn\u00ed z\u00e1v\u011bry, existuj\u00ed ji\u017e d\u016fkazy (z\u00edskan\u00e9 experiment\u00e1ln\u011b od zv\u00ed\u0159at i lid\u00ed), \u017ee u\u017e\u00edv\u00e1n\u00ed shora uveden\u00fdch slou\u010denin m\u016f\u017ee v\u00fdznamn\u011b sn\u00ed\u017eit riziko DCI. V podstat\u011b plat\u00ed, \u017ee donory NO (nap\u0159. nitroglycerin) a antioxidanty (jako vitamin C) p\u016fsob\u00ed proti oxida\u010dn\u00edmu stresu, kter\u00fd je p\u0159\u00ed\u010dinou endoteli\u00e1ln\u00edho po\u0161kozen\u00ed. Takov\u00e9 po\u0161kozen\u00ed m\u016f\u017ee b\u00fdt d\u016fvodem, pro\u010d bublinky vyvol\u00e1vaj\u00ed tak rozs\u00e1hl\u00e9 po\u0161kozen\u00ed zdrav\u00ed. &nbsp;<\/p>\n<p style=\"text-align: justify;\">Jedn\u00e1 se o mimo\u0159\u00e1dn\u011b zaj\u00edmav\u00fd v\u00fdzkum, kter\u00fd m\u016f\u017ee pot\u00e1p\u011b\u010d\u016fm ji\u017e brzy p\u0159in\u00e9st z\u00e1sadn\u00ed a z\u00e1vazn\u00e1 doporu\u010den\u00ed. V sou\u010dasn\u00e9 dob\u011b je v\u0161ak nutno postupovat velmi obez\u0159etn\u011b. Mnoho z t\u011bchto p\u0159\u00edpravk\u016f m\u00e1 rozs\u00e1hl\u00e9 \u00fa\u010dinky &ndash; n\u011bkter\u00e9 z nich mohou zp\u016fsobit v\u00edce \u0161kody ne\u017e u\u017eitku &ndash; a zat\u00edm nem\u00e1me \u017e\u00e1dn\u00e9 praktick\u00e9 d\u016fkazy, \u017ee tyto prost\u0159edky proti klinick\u00e9mu DCI pot\u00e1p\u011b\u010de skute\u010dn\u011b ochr\u00e1n\u00ed. &nbsp;&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Brubakk:<\/strong> Antioxidanty z\u0159ejm\u011b skute\u010dn\u011b sni\u017euj\u00ed tvorbu bublinek. P\u0159i DCI m\u016f\u017ee hr\u00e1t svou roli i skute\u010dnost, \u017ee antioxidanty oslabuj\u00ed z\u00e1n\u011btliv\u00e9 reakce. Ur\u010dit\u011b je zde pot\u0159eba dal\u0161\u00edho v\u00fdzkumu, ale zat\u00edm se tato mo\u017enost jev\u00ed slibn\u011b. V sou\u010dasnosti v\u0161ak v\u00edme p\u0159\u00edli\u0161 m\u00e1lo o \u00fa\u010dinc\u00edch antioxidant\u016f na zdrav\u00e9 lidi.<\/p>\n<p style=\"text-align: justify;\"><strong>Rune Djurhuus:<\/strong> NO je mal\u00e1 sign\u00e1ln\u00ed molekula zp\u016fsobuj\u00edc\u00ed uvoln\u011bn\u00ed a roz\u0161\u00ed\u0159en\u00ed c\u00e9v. V\u00fdzkumy na zv\u00ed\u0159atech prokazuj\u00ed, \u017ee u\u017eit\u00ed farmakologick\u00e9ho prost\u0159edku (nap\u0159. nitroglycerinu), kter\u00fd do krve uvol\u0148uje NO, m\u016f\u017ee sni\u017eovat tvorbu bublinek a zvy\u0161ovat p\u0159e\u017eit\u00ed po dekompresi. A naopak, inhibice enzymu NO-synt\u00e1za (NOS), kter\u00fd vytv\u00e1\u0159\u00ed NO v endotelov\u00e9 vrstv\u011b uvnit\u0159 c\u00e9v, p\u0159\u00edznaky DCI v\u00fdznamn\u011b zhor\u0161ila. Nav\u00edc je o fyzick\u00e9 n\u00e1maze zn\u00e1mo, \u017ee podporuje tvorbu NO v endotelu. P\u0159evl\u00e1d\u00e1 tedy hypot\u00e9za, \u017ee tvorba NO hraje ur\u010ditou roli p\u0159i ochran\u011b vaskul\u00e1rn\u00edho syst\u00e9mu proti nep\u0159\u00edzniv\u00fdm \u00fa\u010dink\u016fm plynov\u00fdch bublinek b\u011bhem dekomprese.<\/p>\n<p style=\"text-align: justify;\">S pot\u00e1p\u011bn\u00edm zpravidla souvis\u00ed zv\u00fd\u0161en\u00fd parci\u00e1ln\u00ed tlak kysl\u00edku. Ned\u00e1vno jsme uk\u00e1zali, \u017ee zv\u00fd\u0161en\u00e1 p\u0159\u00edtomnost kysl\u00edku v krvi (hyperoxie) nem\u00e1 \u017e\u00e1dn\u00fd dopad na schopnost NOS vytv\u00e1\u0159et NO v izolovan\u00fdch bu\u0148k\u00e1ch lidsk\u00e9ho endotelu. Nicm\u00e9n\u011b norm\u00e1ln\u00ed funkce tohoto enzymu z\u00e1vis\u00ed tak\u00e9 na kofaktorech, zvl\u00e1\u0161t\u011b na tetrahydrobiopterinu (BH4). Tato slou\u010denina se snadno oxiduje a v t\u00e9to form\u011b nepodporuje synt\u00e9zu NO. Vystaven\u00ed lidsk\u00fdch endoteli\u00e1ln\u00edch bun\u011bk hyperoxick\u00fdm podm\u00ednk\u00e1m (p\u0159ibli\u017en\u011b t\u0159ikr\u00e1t v\u011bt\u0161\u00edmu parci\u00e1ln\u00edmu tlaku kysl\u00edku, ne\u017e jak\u00fd je u hladiny mo\u0159e) zp\u016fsobilo sn\u00ed\u017een\u00ed koncentrace redukovan\u00e9ho BH4 p\u0159ibli\u017en\u011b o 50 procent. N\u00e1sledkem takov\u00e9ho vystaven\u00ed hyperoxick\u00fdm podm\u00ednk\u00e1m p\u0159i pot\u00e1p\u011bn\u00ed m\u016f\u017ee b\u00fdt tedy sn\u00ed\u017een\u00e1 hladina redukovan\u00e9ho BH4, co\u017e zase omezuje tvorbu NO prost\u0159ednictv\u00edm NOS a tedy potenci\u00e1ln\u011b zvy\u0161uje riziko DCI. Tomuto efektu lze p\u0159edej\u00edt dod\u00e1v\u00e1n\u00edm BH4 do organismu, p\u0159\u00edpadn\u011b u\u017e\u00edv\u00e1n\u00edm antioxidant\u016f, kter\u00e9 zabr\u00e1n\u00ed jeho oxidaci. U pokusn\u00fdch model\u016f se tak\u00e9 prok\u00e1zalo, \u017ee hladinu redukovan\u00e9ho BH4 pom\u00e1h\u00e1 udr\u017eovat i jednoduch\u00fd antioxidant jako vitamin C. Je v\u0161ak nutno zd\u016fraznit, \u017ee tento mechanismus zat\u00edm nebyl potvrzen pokusy na zv\u00ed\u0159etech a studiemi u lid\u00ed. Je mo\u017en\u00e9, \u017ee dal\u0161\u00ed v\u00fdzkum uk\u00e1\u017ee, \u017ee jin\u00e9 faktory mohou sehr\u00e1vat d\u016fle\u017eit\u011bj\u0161\u00ed roli. &nbsp;&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Jako p\u0159\u00edpravn\u00e1 opat\u0159en\u00ed proti DCI se navrhovaly i dal\u0161\u00ed postupy, nap\u0159. celot\u011blov\u00e1 vibrace p\u0159ed zah\u00e1jen\u00edm pot\u00e1p\u011bn\u00ed, p\u0159edb\u011b\u017en\u00e9 d\u00fdch\u00e1n\u00ed kysl\u00edku, p\u0159\u00edpravn\u00e9 ponory a n\u00e1v\u0161t\u011bva sauny p\u0159ed ponorem. Vyplynuly z t\u011bchto n\u00e1vrh\u016f n\u011bjak\u00e9 praktick\u00e9 z\u00e1v\u011bry?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Balestra: <\/strong>Tato p\u0159edb\u011b\u017en\u00e1 opat\u0159en\u00ed p\u0159\u00edmo souvis\u00ed s m\u00edrn\u00fdm zv\u00fd\u0161en\u00edm srde\u010dn\u00ed \u010dinnosti (sauna) nebo se zv\u00fd\u0161en\u00edm lymfatick\u00e9 aktivity (celot\u011blov\u00e1 vibrace, p\u0159edb\u011b\u017en\u00e9 d\u00fdch\u00e1n\u00ed kysl\u00edku). V n\u011bkter\u00fdch p\u0159\u00edpadech se prov\u00e1d\u011blo p\u0159edb\u011b\u017en\u00e9 d\u00fdch\u00e1n\u00ed kysl\u00edku p\u0159\u00edli\u0161 dlouho p\u0159ed ponorem, ne\u017e aby se dalo uva\u017eovat o n\u011bjak\u00e9m denitra\u010dn\u00edm \u00fa\u010dinku. V\u0161echna zm\u00edn\u011bn\u00e1 opat\u0159en\u00ed souvis\u00ed sp\u00ed\u0161e se zm\u00edrn\u011bn\u00edm mikronukleace ne\u017e s denitrac\u00ed. &nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Bennett:<\/strong> V\u0161echna navrhovan\u00e1 opat\u0159en\u00ed p\u0159edstavuj\u00ed pokusy o sn\u00ed\u017een\u00ed nebezpe\u010d\u00ed v\u00fdskytu DCI t\u00edm, \u017ee se p\u0159edejde tvorb\u011b bublinek v organismu. Jedin\u00fd v\u0161eobecn\u011b uzn\u00e1van\u00fd a \u010dasto pou\u017e\u00edvan\u00fd zp\u016fsob je v\u0161ak prov\u00e1d\u011bn\u00ed p\u0159\u00edpravn\u00fdch ponor\u016f, co\u017e znamen\u00e1, \u017ee pot\u00e1p\u011b\u010di, kte\u0159\u00ed se chystaj\u00ed na proveden\u00ed n\u011bjak\u00e9ho velmi n\u00e1ro\u010dn\u00e9ho ponoru (zpravidla do velk\u00e9 hloubky), uskute\u010dn\u00ed nejd\u0159\u00edve \u0159adu ponor\u016f do postupn\u011b se zvy\u0161uj\u00edc\u00edch hloubek, \u010d\u00edm v\u00edce se bl\u00ed\u017e\u00ed datum onoho napl\u00e1novan\u00e9ho nejhlub\u0161\u00edho&nbsp; ponoru. Pro spr\u00e1vnost a opr\u00e1vn\u011bnost tohoto p\u0159\u00edstupu neexistuje dostatek konkr\u00e9tn\u00edch d\u016fkaz\u016f, ale lze uv\u00e9st \u0159adu d\u016fvod\u016f, pro\u010d by mohly b\u00fdt takov\u00e9 p\u0159\u00edpravn\u00e9 ponory u\u017eite\u010dn\u00e9: sezn\u00e1men\u00ed se s v\u00fdstroj\u00ed i s m\u00edstn\u00edmi mo\u0159sk\u00fdmi podm\u00ednkami, prov\u011b\u0159en\u00ed spr\u00e1vn\u00e9 funk\u010dnosti v\u00fdstroje v nep\u0159\u00edli\u0161 n\u00e1ro\u010dn\u00e9m prost\u0159ed\u00ed, obnoven\u00ed si spr\u00e1vn\u00fdch n\u00e1vyk\u016f p\u0159i prov\u00e1d\u011bn\u00ed ponor\u016f atd.<\/p>\n<p style=\"text-align: justify;\">Obzvl\u00e1\u0161t\u011b v Evrop\u011b neust\u00e1le prob\u00edhaj\u00ed pokusy o d\u016fkladn\u00e9 vyhodnocen\u00ed role a d\u016fle\u017eitosti nejr\u016fzn\u011bj\u0161\u00edch p\u0159edb\u011b\u017en\u00fdch opat\u0159en\u00ed a strategi\u00ed, v\u010detn\u011b v\u0161ech shora uveden\u00fdch. Nap\u0159. Blatteau a spol. ned\u00e1vno ozn\u00e1mili proveden\u00ed pokus\u016f s vystaven\u00edm organismu \u00fa\u010dink\u016fm sauny p\u0159ed pot\u00e1p\u011bn\u00edm za \u00fa\u010delem sn\u00ed\u017een\u00ed mno\u017estv\u00ed bublinek &ndash; tento pokus provedlo n\u011bkolik pot\u00e1p\u011b\u010d\u016f dobrovoln\u00edk\u016f. Ale zat\u00edm v\u0161e z\u016fst\u00e1v\u00e1 pouze v teoretick\u00e9 rovin\u011b a a\u017e do t\u00e9to chv\u00edle nev\u00edm o \u017e\u00e1dn\u00e9m praktick\u00e9m vyu\u017eit\u00ed, kter\u00e9 by z jejich v\u00fdzkumu vyplynulo. &nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Brubakk: <\/strong>Nebylo zve\u0159ejn\u011bno \u017e\u00e1dn\u00e9 praktick\u00e9 vyu\u017eit\u00ed, ale z\u00edskan\u00e9 \u00fadaje nazna\u010duj\u00ed, \u017ee tato opat\u0159en\u00ed tvorbu bublinek sni\u017eovat mohou.<\/p>\n<p style=\"text-align: justify;\"><strong>Seznamte se s diskutuj\u00edc\u00edmi odborn\u00edky<\/p>\n<p><\/strong><strong>Costantino Balestra<\/strong>, Ph.D., je viceprezidentem pro v\u00fdzkum a vzd\u011bl\u00e1v\u00e1n\u00ed u DAN Europe, \u0159editelem DAN Europe pro \u00fazem\u00ed Beneluxu a Francie a viceprezidentem evropsk\u00e9 spole\u010dnosti European Underwater and Baromedical Society (EUBS). Rovn\u011b\u017e \u0159\u00edd\u00ed fyziologickou laborato\u0159 Environmental, Aging and Occupational Physiology Lab na vysok\u00e9 \u0161kole Haute Ecole Paul-Henri Spaak&nbsp;v Bruselu. Sv\u016fj hlavn\u00ed z\u00e1jem v\u011bnuje v\u00fdzkumu fyziologie extr\u00e9mn\u00edch prost\u0159ed\u00ed a v\u011bdeck\u00e9mu zkoum\u00e1n\u00ed r\u016fzn\u00fdch druh\u016f sportu. &nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Michael Bennett<\/strong>, M.D., FANZCA, ANZCA Cert DHM, je p\u0159edn\u00edm specialistou v nemocnici Prince of Wales Hospital a profesorem hyperbarick\u00e9 medic\u00edny na Univerzit\u011b Nov\u00e9ho Ji\u017en\u00edho Walesu v Sydney v Austr\u00e1lii. M\u00e1 sedmn\u00e1ctilet\u00e9 zku\u0161enosti s \u0159e\u0161en\u00edm pot\u00e1p\u011b\u010dsk\u00fdch nehod a zran\u011bn\u00ed v Ji\u017en\u00edm Pacifiku a sv\u016fj doktorsk\u00fd titul z\u00edskal za v\u00fdsledky v\u00fdzkumu v oboru pot\u00e1p\u011b\u010dsk\u00e9 a hyperbarick\u00e9 medic\u00edny.<\/p>\n<p style=\"text-align: justify;\"><strong>Alf O. Brubakk<\/strong>, M.D., je profesorem environment\u00e1ln\u00ed fyziologie na Norsk\u00e9 univerzit\u011b p\u0159\u00edrodn\u00edch v\u011bd a technologi\u00ed v Trondheimu. Je specialistou na kardiologii a anesteziologii a v\u00edce ne\u017e dvacet let se zab\u00fdv\u00e1 studiem dekompresn\u00edho onemocn\u011bn\u00ed. Prov\u00e1d\u00ed v\u00fdzkum i v jin\u00fdch sm\u011brech environment\u00e1ln\u00ed fyziologie, v\u010detn\u011b \u00fa\u010dink\u016f chladu a kosmick\u00e9ho prostoru.<\/p>\n<p style=\"text-align: justify;\"><strong>Rune Djurhuus<\/strong>, Ph.D., je vedouc\u00edm v\u011bdeck\u00fdm pracovn\u00edkem v oboru biochemie a toxikologie na Norsk\u00e9m institutu pro z\u00e1sahy pod vodou v norsk\u00e9m Bergenu. Sv\u016fj v\u00fdzkum zam\u011b\u0159uje na chemickou kontaminaci d\u00fdchac\u00edho plynu pot\u00e1p\u011b\u010d\u016f (t. j. na hyperbarickou toxikologii) a na bun\u011b\u010dn\u00e9 ochrann\u00e9 mechanismy souvisej\u00edc\u00ed s endoteli\u00e1ln\u00edm po\u0161kozen\u00edm zp\u016fsoben\u00fdm dekompresn\u00ed stresem.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u0161eobecn\u011b se uzn\u00e1v\u00e1, \u017ee nejz\u00e1va\u017en\u011bj\u0161\u00edmi rizikov\u00fdmi faktory pro dekompresn\u00ed onemocn\u011bn\u00ed (DCI) jsou trv\u00e1n\u00ed a hloubka ponoru. Pot\u00e1p\u011b\u010de tak\u00e9 velmi zaj\u00edm\u00e1, jak mohou sn\u00ed\u017eit nebezpe\u010d\u00ed DCI&#8230;<\/p>\n","protected":false},"author":1,"featured_media":11374703,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[384],"tags":[],"authors":[704],"class_list":["post-11385590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-clanky","authors-brian-harper-cs_cz"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mo\u017enosti p\u0159edch\u00e1zet riziko dekompresn\u00edho onemocn\u011bn\u00ed - Alert Diver<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/alertdiver.eu\/cs_CZ\/clanky\/moznosti-predchazet-riziko-dekompresniho-onemocneni\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mo\u017enosti p\u0159edch\u00e1zet riziko dekompresn\u00edho onemocn\u011bn\u00ed - Alert Diver\" \/>\n<meta property=\"og:description\" content=\"V\u0161eobecn\u011b se uzn\u00e1v\u00e1, \u017ee nejz\u00e1va\u017en\u011bj\u0161\u00edmi rizikov\u00fdmi faktory pro dekompresn\u00ed onemocn\u011bn\u00ed (DCI) jsou trv\u00e1n\u00ed a hloubka ponoru. 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