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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

The normal calculated anatomic shunt is about

A. 0.5-1 percent

B. 2-5 percent

C. 6-9 percent

D. 10-12 percent

Summary Introduction

Introduction:

Pulmonary shunting is a condition where alveoli are perfused with the normal amount of blood, but the oxygen does not reach the alveoli of the lungs, so enough ventilation does not occur. This means that the ventilation to perfusion ratio is zero. Pulmonary shunting could be due to absolute shunts (anatomical) or pathological shunts (congenital defects and pulmonary edema). This leads to the mixing of non-oxygenated blood with the oxygenated blood.

Explanation

Justification/Explanation for the correct answer:

Option (b) is, ‘2-5%.’ True or absolute shunts could be anatomic or capillary. Anatomic shunting is the perfect type of pulmonary shunting as no oxygen comes in contact with the alveoli of the lungs. When calculated, the anatomic shunt value is about 3% of the cardiac output (4.5-5 L/min liter per minute). Shunting leads to venous admixture, which is the mixing of non-oxygenated blood with the oxygenated blood. Hence, option (b) is correct.

Explanation for incorrect answers:

Option (a) is, ‘0.5-1%.’ Non-oxygenated blood gets mixed with the oxygenated blood distal to alveoli due to pulmonary shunting...

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