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Old 04-14-2014
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Help Infarction of the Liver

Hello, please could someone explain

how come does the liver have "dual blood supply" and dont get infarcted cause if the hepatic artery gets blocked, the portal vein will compensate??

the portal vein brings deoxygenated blood, and if the liver being the boss of major functions wouldnt this oxygen delivery be not enough via this portal vein??
thanks so much in advance.
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Old 04-14-2014
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Liver gets blood supply from both hepatic artery and portal vein (which drains spleen gi and associated organs)... Approximately half of the liver's oxygen demand is met by hepatic artery and half by portal vein. So oxygen is provided from both sources , if hepatic artery gets blocked portal vein compensates...portal vein inspite of being vein carries half of the oxygen supply to liver.. I hope this helps... This is what I knew...
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Originally Posted by drpisho View Post
Hello, please could someone explain

how come does the liver have "dual blood supply" and dont get infarcted cause if the hepatic artery gets blocked, the portal vein will compensate??

the portal vein brings deoxygenated blood, and if the liver being the boss of major functions wouldnt this oxygen delivery be not enough via this portal vein??
thanks so much in advance.
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dr_kg (04-14-2014), drpisho (04-14-2014), dwijeshsheth (04-15-2014)
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Old 04-14-2014
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thank you! got it.
so the
portal vein carries deoxygenated blood plus some oxygenated blood.
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Old 04-15-2014
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Infarction is caused due to complete cut off of blood supply.
Although portal vein carries deoxygenated blood, it still has oxygen in it....so this isn't enough to cause infarction of liver.

Lets consider a scenario
1. A person's trachea is completely occluded by foreign body.
What happens? ..........He dies, if immediate measures are not taken.

2. A person breathes in air consisting of 10% oxygen( normally 21%).
What happens?..........He survives......may not have a happy time, but nevertheless he survives.

Hope this analogy (as much lame as it may seem) helps..........
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