Hemodynamic changes after hepatectomy in rats studied with radioactive microspheres

Area of Science:

• Surgical Research
• Cardiovascular Physiology
• Hepatobiliary Surgery

Background:

• Simultaneous measurement of hepatic arterial and portal venous blood flow is challenging, particularly in small animal models.
• Understanding splanchnic hemodynamics post-hepatectomy is crucial for surgical outcomes and patient recovery.

Purpose of the Study:

• To evaluate the utility of the radioactive microsphere technique for quantifying splanchnic hemodynamics following partial hepatectomy in rats.
• To assess changes in hepatic arterial blood flow, portal venous inflow, and portal systemic shunt after liver resection.

Main Methods:

• Radioactive microspheres were injected into the left ventricle of rats, with a reference sample withdrawn from the femoral artery.
• Organ blood flow was calculated using radioactivity measurements and the reference sample technique.
• Portal systemic shunt was assessed by comparing radioactivity in the lungs and liver after intrasplenic microsphere injection.

Main Results:

• Partial hepatectomy led to a significant decrease in cardiac index and hepatic arterial blood flow.
• Portal venous inflow and total hepatic blood flow significantly increased post-hepatectomy.
• Despite elevated portal pressure, the extent of portal systemic shunt was negligible after surgery.

Conclusions:

• The radioactive microsphere technique with a reference sample method is a simple, rapid, reliable, and reproducible approach for studying hemodynamic alterations after partial hepatectomy.
• This method provides valuable insights into splanchnic circulatory adjustments following liver resection in small animal models.