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Summary
Human hepatic circulation differs between cadaver and live studies. Contrary to the end-artery belief, live studies reveal collateral arteries in the liver, challenging traditional views.
Area of Science:
- Vascular anatomy
- Human physiology
- Hepatic circulation
Background:
- Traditional understanding posits hepatic arteries as end-arteries.
- Previous studies, including corrosion casts, support this end-artery concept.
- Discrepancies exist between post-mortem and in vivo observations of liver vasculature.
Purpose of the Study:
- To investigate the functional patency of intrahepatic arteries in vivo.
- To challenge or confirm the end-artery nature of human hepatic arteries.
- To elucidate collateral circulation within the liver.
Main Methods:
- In vivo angiographic techniques were employed.
- Ligation of either the left or right ramus of the hepatic artery was performed.
- Vascular perfusion patterns were observed after arterial ligation.
Main Results:
- Intrahepatic translobar collateral arteries were demonstrated.
- These collaterals were capable of perfusing the entire occluded arterial system.
- No intermediate filling of sinusoids or portal venules was observed.
- Findings contradict the end-artery model.
Conclusions:
- The traditional view of hepatic arteries as end-arteries is not supported by in vivo evidence.
- Intrahepatic collateral circulation plays a significant role in liver perfusion.
- Angiographic studies provide crucial insights into dynamic hepatic circulation.