Abstract
We studied portosystemic hemodynamic responsiveness after 1 min orthostasis in nine patients with cirrhosis and nine age-matched normal subjects. Orthostasis increased diastolic arterial pressure, which is a close indicator of arterial tone, in normal subjects (+17%,P<0.01). In contrast, no significant change in diastolic arterial pressure was observed in patients with cirrhosis (−3%, NS). The increase in heart rate was less in patients with cirrhosis than in normal subjects (+15% vs +28%,P<0.05). Orthostasis also decreased portal blood flow, which was assessed by an echo-Doppler flowmetry, in normal subjects (−27%,P<0.01), but in patients with cirrhosis it was not modified (−3%, NS). Plasma noradrenaline concentration showed similar increase in both groups (normal vs cirrhosis; +61% vs +55%, NS). Although the change in plasma noradrenaline concentration was related with that in diastolic arterial pressure (r=0.71,P<0.05) and inversely with that in portal blood flow (r=−0.69,P<0.05) in normal subjects, no such significant correlation was found in patients with cirrhosis. We conclude that (1) a reduced hemodynamic responsiveness to sympathetic stimulation exists on both systemic and portohepatic vascular beds and (2) such a blunted baroreflex function is probably located at the receptor or effector level in patients with cirrhosis.
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Iwao, T., Toyonaga, A., Ikegami, M. et al. Reduced portosystemic hemodynamic responsiveness after orthostasis in patients with cirrhosis. Digest Dis Sci 38, 1251–1258 (1993). https://doi.org/10.1007/BF01296074
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DOI: https://doi.org/10.1007/BF01296074