Elsevier

Journal of Hepatology

Volume 12, Issue 2, March 1991, Pages 207-216
Journal of Hepatology

Regular paper
Reduced cardiovascular responsiveness to exercise-induced sympathoadrenergic stimulation in patients with cirrhosis

https://doi.org/10.1016/0168-8278(91)90940-DGet rights and content

Abstract

Cardiovascular responsiveness to sympathoadrenergic activation obtained by muscle exercise in the supine position was evaluated in 22 patients with cirrhosis (11 alcoholic, 11 postnecrotic/cryptogenic; 14 with ascites) and 10 controls of comparable age. Plasma norepinephrine, heart rate, diastolic arterial pressure and cardiac function, as evaluated by systolic time intervals, were monitored. At rest, cirrhotics had higher norepinephrine (154 ± 19 S.E.M. ng/l) and heart rate (79 ± 2 beats per min) than controls (71 ± 3 ng/l, p < 0.01; 67 ± 2 beats per min, p < 0.001), whereas diastolic arterial pressure was similar. Among systolic time intervals, electromechanical systole, pre-ejection period, electromechanical delay and pre-ejection period to left ventricular ejection time ratios were prolonged (p < 0.05 or less). Exercise led to significant increases in plasma norepinephrine, heart rate and diastolic arterial pressure in both controls and patients. In the latter, however, whereas the increase in norepinephrine was greater (p < 0.001), those in heart rate and diastolic arterial pressure were less (p < 0.005). As expected, most systolic time intervals shortened, but the decrease in pre-ejecticn period (p < 0.05), isometric contraction time (p < 0.02) and pre-ejection period to left ventricular ejection time ratio (p = 0.06) was less in patients than in controls. Direct correlations between exercise-induced changes in norepinephrine and both diastolic arterial pressure (r = 0.81; p < 0.005) and heart rate (r = 0.85; p < 0.002) were observed in controls, while inverse correlations (r = −0.67, p < 0.001 and r = −0.44; p < 0.05) were found in cirrhotics. These results suggest that cardiovascular reactivity to the sympathetic drive is impaired in cirrhotics. The impairment of cardiac contractility may be due to altered electromechanical coupling.

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