Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

When lung compliance decreases, the patient commonly has

1. an increased ventilator rate.

2. a decreased tidal volume.

3. an increased tidal volume.

4. a decreased ventilator rate.

A. 1 only

B. 2 only

C. 3 and 4 only

D. 1 and 2 only

Summary Introduction


Pulmonary compliance is the ability of the pulmonary wall to bear the pressure exerted by the air present and the air inspired. Lung compliance is measured as a change in the volume of lungs per unit change in the pressure. It determines the capacity of the lungs to accommodate the volume of air in liters for each centimeter change in the pressure of water. The combined average value of the compliance for the lung and the chest wall is 0.1 L/cm of water. The wall of the lungs and the thoracic wall recoil, but the compliance of only the lung wall is 2.0 L/cm of water.


Justification/ Explanation for the correct answer:

Option (d) states that when lung compliance decreases, there is an increase in the ventilation rate and decrease in the tidal volume. The ventilation rate is the number of breaths a person takes in one minute. The compliance, if decreases, causes the breathing rate to increase, so that more air can enter into the lungs per minute. The tidal volume is the volume of air inspired or expired in a normal breath. The tidal volume decreases with a decrease in compliance. Hence, option (d) is the correct answer.

The explanation for the incorrect answers:

Option (a) states that there will only be an increase in the ventilation rate when the lung compliance decreases but the tidal volume also decreases. The low tidal volume is necessary to protect the lungs against any damage because the compliance has decreased...

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