Ritanserin decreases portal pressure in conscious and unrestrained cirrhotic rats.

Abstract:

:We have recently demonstrated that ritanserin, a serotonin 5-hydroxytryptamine receptor antagonist void of systemic effects, caused a significant reduction of portal pressure in conscious cirrhotic dogs. The mechanism by which ritanserin lowers portal pressure is poorly defined. We investigated the splanchnic and systemic hemodynamic effects of ritanserin (0.63 mg/kg body wt i.v., a dose known to completely inhibit binding of 5-hydroxytryptamine to its receptors), in conscious and unrestrained cirrhotic rats (n = 13). Heparinized catheters were placed into the portal vein, inferior vena cava, aorta, and left ventricle with exit from the neck. Hemodynamic studies were performed 4 h after consciousness was regained. Cardiac output and regional blood flows were measured using radiolabeled microspheres and the reference sample method. Sixty minutes after administration, ritanserin caused a significant reduction of portal pressure (-17%) with minimal changes in portal venous inflow (+3%). Portal vascular resistance decreased significantly (-23%), whereas splanchnic arteriolar resistance was similar before and after ritanserin. A significant increase in mean arterial pressure (+5%) and cardiac output (+22%) was observed. Our results suggest that ritanserin lowers portal pressure through a mechanism separate from portal venous inflow. This effect could be due to changes in intrahepatic or on portocollateral resistances, or both. These findings support the potential use of this new agent in the treatment of portal hypertension.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Mastai R,Giroux L,Semret M,Huet PM

doi

10.1016/0016-5085(90)91302-m

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

141-5

issue

1

eissn

0016-5085

issn

1528-0012

pii

0016-5085(90)91302-M

journal_volume

98

pub_type

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