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[Changes of hemodynamics and concentrations of nitric oxide, endothelin, prostacyclin, and thromboxane A2 during portal cavity clamping and opening in portal hypertensive canines]. | LitMetric

AI Article Synopsis

Article Abstract

Objective: To observe the changes in systemic hemodynamics and their relations to the concentrations of nitric oxide, endothelin, prostacyclin, and thromboxane A2 after portal cavity clamping and opening in portal hypertensive canines.

Methods: Twelve canines were randomly divided into control group and model group, and partial ligation of the portal vein was performed in the model group. Portal cavity clamping and opening was performed 12 weeks later in the two groups. The hemodynamic parameters including cardiac output index (CI), heart rate (HR), mean artery blood pressure (MABP), central venous pressure (CVP), pulmonary arteriole wedge pressure (PAWP), and systemic vascular resistance index (SVRI) were measured during the operation. Samples were obtained from the central vein at 3 time points during the operation for measuring NO, ET, PGI2, and TXA2.

Results: Portal vein ligation and portal cavity clamping produced obvious changes in the systemic circulation of the dogs, and the alteration was milder in the control group. After obstruction of the portal vein, the NO levels in systemic circulation in portal hypertensive dogs declined obviously, but gradually recovered the normal level after reperfusion.

Conclusion: Systemic circulation undergoes significant alterations after portal vein obstruction, but its changes in portal hypertensive dogs are milder than those in the control group, the mechanism of which needs further investigation.

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