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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

When shunted, non-reoxygenated blood mixes with reoxygenated blood distal to the alveoli (venous admixture), the

1. P o 2 of the non-oxygenated blood increases

2. CaO2 of the reoxygenated blood decreases

3. P o 2 of the reoxygenated blood increases

4. Ca o 2 of the non-oxygenated blood decreases

A. 1 only

B. 4 only

C. 1 and 2 only

D. 3 and 4 only

Summary Introduction

Introduction:

Pulmonary shunting is a condition in which alveoli are perfused with the normal amount of blood but the oxygen does not reach the alveoli of the lungs, and hence, enough ventilation do not occur. This means the ventilation to perfusion ratio is zero. Pulmonary shunting could be due to absolute shunts (anatomical) or pathological shunts (congenital defects, pulmonary oedema etc.). This leads to venous admixture i.e. non-oxygenated blood gets shunted distal to alveoli and mixes with the oxygenated blood.

Explanation

Justification/Explanation for correct answer:

When venous admixture occurs, the process continues until all the mixed non-oxygenated and reoxygenated blood has the same PO2 throughout the plasma with hemoglobin having the same number of oxygen molecules. So, the non-oxygenated blood has an increased oxygen content and an increased partial pressure of oxygen and the reoxygenated blood has a decreased oxygen content and partial pressure. Hence, option (c) is the correct answer.

Explanation for incorrect answer:

Non-oxygenated blood gets mixed with oxygenated blood, distal to alveoli. Oxygenated blood is rich in oxygen. So, the oxygen moves from oxygenated blood to non-reoxygenated blood, and PO2 of non-oxygenated blood increases. But option (a) only has 1, which isn’t the only correct option...

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