Stroke, Vol 21, 1178-1184, Copyright © 1990 by American Heart Association
F Sterz, Y Leonov, P Safar, A Radovsky, SA Tisherman and K Oku
We studied blood flow-promoting therapies after cardiac arrest in 18 dogs.
Our model consisted of ventricular fibrillation (no blood flow) lasting
12.5 minutes, controlled reperfusion with cardiopulmonary bypass and
defibrillation within 5 minutes, controlled intermittent positive-pressure
ventilation to 20 hours, and intensive care to 96 hours. Group I (control,
n = 6) dogs were reperfused under conditions of normotension (mean arterial
blood pressure 100 mm Hg) and normal hematocrit (greater than or equal to
35%). Group II (n = 6) and III (n = 6) dogs were treated with
norepinephrine at the beginning of reperfusion to induce hypertension for 4
hours. In addition, group III dogs received hypervolemic hemodilution to a
hematocrit of 20% using dextran 40. There were no differences in the time
to recovery of electroencephalographic activity among groups. All six group
I dogs remained severely disabled; in groups II and III combined, six of
the 12 dogs achieved good outcome (p less than 0.01). Some regional
histopathologic damage scores at 96 hours were better in groups II and/or
III than in group I (neocortex: p less than 0.05 group II different from
group I; hippocampus: p less than 0.01 both groups II and III different
from group I). Total histopathologic damage scores were similar among the
groups. A hypertensive bout with a peak mean arterial blood pressure of
greater than or equal to 200 mm Hg beginning 1-5 minutes after the start of
reperfusion was correlated with good outcome (p less than 0.01). Our
results support the use of an initial bout of severe hypertension, but not
the use of delayed hemodilution.
ARTICLES
Hypertension with or without hemodilution after cardiac arrest in dogs
International Resuscitation Research Center, University of Pittsburgh, PA 15260.
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