NITRIC OXIDE SYNTHESIS INHIBITION DOES NOT IMPROVE THE HEMODYNAMIC RESPONSE TO HEMORRHAGIC SHOCK IN DEHYDRATED CONSCIOUS SWINE
- 1 April 1995
- journal article
- research article
- Published by Wolters Kluwer Health in Shock
- Vol. 3 (4) , 292-298
- https://doi.org/10.1097/00024382-199504000-00008
Abstract
Nitric oxide (NO) may influence the hemodynamic response to hemorrhage. To test this hypothesis, the NO synthesis inhibitor Nω-nitro-L-arginine methyl ester (L-NAME) was administered to conscious, dehydrated swine during a 37% blood volume hemorrhage and a 180 min recovery period without fluid resuscitation. L-NAME (.75 mg/kg bolus plus constant infusion of .75 mg/kg/h) was given via a central intravenous catheter during the bleed. The selectivity and specificity of L-NAME as a NO synthesis inhibitor in pigs was validated in pilot studies. The present study shows that inhibition of NO synthesis with L-NAME had no significant effect on the major hemodynamic parameters during and after hemorrhage when compared to dehydrated and euhydrated control groups. Only stroke volume and A-Vo2 were significantly different from controls. Mortality was 83% for the L-NAME group and 44% for controls at 180 min of recovery (NS). The results suggest that NO synthesis inhibition provides no hemodynamic benefit during hemorrhage in dehydrated, conscious swine.Keywords
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