Hyperdynamic Circulation in Patients with Liver Cirrhosis and Portal Hypertension.
10.4166/kjg.2009.54.3.143
- Author:
Moon Young KIM
1
;
Soon Koo BAIK
Author Information
1. Department of Internal Medicine, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea. baiksk@yonsei.ac.kr
- Publication Type:Review ; English Abstract
- Keywords:
Hyperdynamic circulation;
Portal hypertension;
Liver cirrhosis
- MeSH:
Blood Circulation/*physiology;
Blood Flow Velocity/physiology;
Humans;
Hypertension, Portal/etiology/*physiopathology;
Liver/blood supply/physiopathology;
Liver Cirrhosis/drug therapy/etiology/*physiopathology;
Nitric Oxide/metabolism;
Nitric Oxide Synthase Type III/metabolism;
Vasodilation
- From:The Korean Journal of Gastroenterology
2009;54(3):143-148
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Hyperdynamic circulation in patients with liver cirrhosis is characterized by increased cardiac output and heart rate, and decreased systemic vascular resistance with low arterial blood pressure and currently focused on understanding the pathogenesis because of possibility of developing novel treatment modality. Basically, these hemodynamic alternations arise from portal hypertension. Portosystemic collaterals develop to counterbalance the increased intrahepatic vascular resistance to portal blood flow and induce an increase in venous return to heart. Increased shear stress in vascular endothelial cell related high blood flow by portosystemic shunting contributes to this up-regulation of eNOS resulting in NO overproduction. Additionally, bypassing through portosystemic collaterals and escaping degradation of over-produced circulating vasodilators in the diseased liver can promote the peripheral arterial vasodilation. Vasodilation of the systemic and splanchnic circulations lead to a reduced systemic vascular resistance, and increased cardiac output and splanchnic blood flow. Furthermore, neurohumoral vasoconstrictive systems including systemic nervous system, rennin angiotensin aldosterone system, and vasopressin are intensively activated secondary to vasodilation. However, hyperdynamic circulation would be more aggravated by the activated vasoconstrictive systems. With the progression of the cirrhotic process, hyperdynamic alternations can be more profound due to hyporesponsiveness to vasoconstrictors and increased shunt formation in conjunction with autonomic neuropathy. Eventually, splanchnic arterial vasodilation results in an increase portal venous inflow, maintaining the elevated portal venous pressure. Hyperdynamic circulation is intimately involved in portal hypertension with liver cirrhosis, therefore it is reasonable to have an interest in complete understanding of the pathogenensis of hyperdynamic circulation to develop novel treatment modality.
