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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

If the pressure in the pulmonary artery is 34 mm Hg and the pressure in the left atrium is 9 mm Hg, what is the driving pressure?

A. 9 mm Hg

B. 17 mm Hg

C. 25 mm Hg

D. 34 mm Hg

Summary Introduction

Introduction:

The deoxygenated blood enters the right and left pulmonary arteries and goes to the capillary bed of the lungs, where the deoxygenated blood is oxygenated. It enters the right and left pulmonary veins after the deoxygenated blood is converted into oxygenated blood. These pulmonary veins carry the oxygenated blood in them to the left atrium of the heart so that it can be pumped to all the body tissues.

Explanation

Justification for the correct answer:

Option (C) is 25 mm Hg. The driving pressure is the difference between the pressures upstream in the vessel and the pressure downstream in the vessel. The upstream region is the pulmonary artery and the downstream region is the left atrium in this case. The difference between the pressures at these points is the driving pressure.

Driving pressure=Pressure in the pulmonary arterypressure in the left atrium=34 mm Hg - 9 mm Hg=25 mm Hg

The driving pressure is 25 mm Hg

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