Acute Ethanol Does Not Protect Against Ischemic/Reperfusion Injury in Rabbit Myocardium.

Abstract:

:Moderate use of alcohol has shown protective effects in coronary artery disease, while excessive use has been associated with cardiomyopathy and hypertension. Since alcohol is a vasodilator, we postulated that it might have protective effects when administered acutely in the setting of ischemia/reperfusion. Therefore, we studied the acute effects of alcohol on myocardial infarction in a rabbit model. Anesthetized, open chest rabbits were subjected to a 30 minute coronary artery occlusion followed by 4 hours of reperfusion. Rabbits were randomized to a control group (n = 20), receiving an infusion of 10 ml normal saline, intravenously, over 10 minutes via a Harvard pump, or an alcohol group (n = 20), receiving a diluted solution of 100% ethanol (1 ml/kg diluted in normal saline to 10 ml total solution) infused in a similar fashion. This infusion regimen resulted in an average blood alcohol level of 110 mg/dl (range 77-129) tested in five rabbits within the study. Ten minutes after in fusion, a marginal branch of the circumflex artery was occluded. Regional myocardial blood flow during coronary occlusion and reperfusion was measured using radioactive microspheres. Myocardial ischemic area at risk (AR) was assessed by blue dye injection and myocardial necrosis (AN) by triphenyltetrazolium chloride (TTC) staining. The mean regional coronary blood flow in ischemic tissue was 0.04 +/- 0.01 ml/min/g in the control group versus 0.03 +/- 0.01 ml/min/g in the experimental group (p = NS) and averaged 1.74 ml/min/g (control) to 1.98 ml/min/g (alcohol) in the nonischemic tissue. All rabbits received comparable ischemic insult: Collateral blood flow and AR were similar in both groups. An overall analysis showed no significant reduction in infarct size (expressed as the percent of necrotic tissue within the area at risk) in the alcohol group (23 +/- 3%) compared with the control group (27 +/- 4%). In conclusion, alcohol did not reduce infarct size in the rabb it model.

journal_name

J Thromb Thrombolysis

authors

Bellows SD,Hale SL,Kloner RA

doi

10.1007/BF00181659

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

181-184

issue

3

eissn

0929-5305

issn

1573-742X

journal_volume

3

pub_type

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