Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

Case 2

As the preceding condition worsened, the patient's intrapulmonary shunting ( Qs/Q T ) (decreased_____, increased_______), the oxygen extraction ratio ( O 2 ER ) (decreased ___________, increased_______), and the total oxygen delivery ( D o 2 ) (decreased________, increased___________).

Summary Introduction

To review:

The patient’s intrapulmonary shunting, oxygen extraction ratio, and total oxygen delivery upon the worsening of her condition.


An 18-year-old woman came to the hospital due to respiratory distress. She had asthma throughout her life. She appeared fatigued and cyanotic and used her accessory muscles for inspiration. She was suffering an acute ventilatory failure with severe hypoxemia. Her blood pressure was 177/110 mm Hg, the partial pressure of oxygen in arterial blood (Pao2) was 27 mm Hg, and oxygen saturation (Sao2) was of 42%.

Please refer to Clinical Application Case- 2 for further information.


In case of severe asthma, the lungs become overinflated (ballooning) and there is respiratory depression (decrease in the respiratory rate). Hyperinflation occurs when the gas cannot leave the lungs during exhalation and this obstructs the air from entering during inspiration. This, in turn, decreases the alveolar oxygen and alveolar carbon dioxide increases.

Total oxygen delivery is known as the amount of oxygen that can be transported to the peripheral tissues...

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