Normal range of the pulmonary shunt fraction is what percentage?

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Prepare for the NBRC TMC Exam by reviewing essential normal values. Enhance your understanding with multiple-choice questions featuring detailed explanations and hints. Ensure your readiness for success!

Multiple Choice

Normal range of the pulmonary shunt fraction is what percentage?

Explanation:
The shunt fraction represents the portion of blood that passes through the lungs without participating in gas exchange. In healthy lungs, this venous admixture is very small, about 2-3% of cardiac output. This tiny amount explains why arterial oxygen content remains largely normal despite some blood bypassing ventilated units. If the shunt fraction rises above this level, oxygenation can deteriorate: around 5-7% suggests mild shunt or ventilation–perfusion imbalance, while values near 10-12% or 15-20% indicate substantial shunting and significant impairment seen with lung disease.

The shunt fraction represents the portion of blood that passes through the lungs without participating in gas exchange. In healthy lungs, this venous admixture is very small, about 2-3% of cardiac output. This tiny amount explains why arterial oxygen content remains largely normal despite some blood bypassing ventilated units. If the shunt fraction rises above this level, oxygenation can deteriorate: around 5-7% suggests mild shunt or ventilation–perfusion imbalance, while values near 10-12% or 15-20% indicate substantial shunting and significant impairment seen with lung disease.

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