Abstract:
BACKGROUND:All clinical and biological manifestations related to postcardiac arrest (CA) syndrome are attributed to ischemia-reperfusion injury in various organs including brain and heart. Molecular hydrogen (H(2)) has potential as a novel antioxidant. This study tested the hypothesis that inhalation of H(2) gas starting at the beginning of cardiopulmonary resuscitation (CPR) could improve the outcome of CA. METHODS AND RESULTS:Ventricular fibrillation was induced by transcutaneous electrical epicardial stimulation in rats. After 5 minutes of the subsequent CA, rats were randomly assigned to 1 of 4 experimental groups at the beginning of CPR: mechanical ventilation (MV) with 2% N(2) and 98% O(2) under normothermia (37°C), the control group; MV with 2% H(2) and 98% O(2) under normothermia; MV with 2% N(2) and 98% O(2) under therapeutic hypothermia (TH), 33°C; and MV with 2% H(2) and 98% O(2) under TH. Mixed gas inhalation and TH continued until 2 hours after the return of spontaneous circulation (ROSC). H(2) gas inhalation yielded better improvement in survival and neurological deficit score (NDS) after ROSC to an extent comparable to TH. H(2) gas inhalation, but not TH, prevented a rise in left ventricular end-diastolic pressure and increase in serum IL-6 level after ROSC. The salutary impact of H(2) gas was at least partially attributed to the radical-scavenging effects of H(2) gas, because both 8-OHdG- and 4-HNE-positive cardiomyocytes were markedly suppressed by H(2) gas inhalation after ROSC. CONCLUSIONS:Inhalation of H(2) gas is a favorable strategy to mitigate mortality and functional outcome of post-CA syndrome in a rat model, either alone or in combination with TH.
journal_name
J Am Heart Assocjournal_title
Journal of the American Heart Associationauthors
Hayashida K,Sano M,Kamimura N,Yokota T,Suzuki M,Maekawa Y,Kawamura A,Abe T,Ohta S,Fukuda K,Hori Sdoi
10.1161/JAHA.112.003459subject
Has Abstractpub_date
2012-10-01 00:00:00pages
e003459issue
5issn
2047-9980pii
jah392journal_volume
1pub_type
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