Pulmonary shunt

What is Pulmonary shunt?

A pulmonary shunt is a physiological condition which results when the alveoli of the lungs are perfused with blood as normal, but ventilation (the supply of air) fails to supply the perfused region. In other words, the ventilation/perfusion ratio (the ratio of air reaching the alveoli to blood perfusing them) is zero. A pulmonary shunt often occurs when the alveoli fill with fluid, causing parts of the lung to be unventilated although they are still perfused.

Intrapulmonary shunting is the main cause of hypoxemia (inadequate blood oxygen) in pulmonary edema and conditions such as pneumonia in which the lungs become consolidated. The shunt fraction is the percentage of blood put out by the heart that is not completely oxygenated.

In pathological conditions such as pulmonary contusion, the shunt fraction is significantly greater and even breathing 100% oxygen does not fully oxygenate the blood.

Questions and answers on "Pulmonary shunt"

I am concerned about a high FHHB level that has been climbing over the years. It is now at 64.5%.

doctor1 MD

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Kindly answer my query

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Thanks for your query.
Fractional deoxyhemoglobin concentration is 64.5% which is...

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I am 57 years old and I recently had an echocardiogram ordered by my family physician, her Dx was heart murmur. The test result was an aortic...

doctor1 MD

Hello Thanks for the query. It seems there is a confusion between your family physician and the echo-cardiogram report. Well, this is to inform you...

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