# The normal calculated anatomic shunt is about A. 0.5-1 percent B. 2-5 percent C. 6-9 percent D. 10-12 percent

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
Publisher: Cengage Learning,
ISBN: 9781337794909

#### Solutions

Chapter
Section
Chapter 6, Problem 5RQ
Textbook Problem

## The normal calculated anatomic shunt is aboutA. 0.5-1 percentB. 2-5 percentC. 6-9 percentD. 10-12 percent

Expert Solution
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 of Solution

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.

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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