Chapter 4, Problem 6RQ

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Chapter
Section

### Cardiopulmonary Anatomy & Physiolo...

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

# If a patient is receiving an FI O 2 of 0.60 on a day when the barometric pressure is 725 mm Hg, and if the Pa co 2 is 50 mm Hg, what is the patient’s alveolar oxygen tension ( PA o 2 )?A. 177 mm HgB. 233 mm HgC. 344 mm HgD. 415 mm Hg

Summary Introduction

Introduction:

The alveolar oxygen tension or PAO2 is calculated with the help of the ideal alveolar gas equation. In this equation, the values of partial pressure of water vapor (47 mm Hg-millimeter of mercury), partial pressure of carbon dioxide (50 mm Hg), fractional concentration of inspired oxygen (0.60), and barometric pressure are used for calculations.

Explanation

Justification/ Explanation for the correct answer:

Option (c) is, â€˜344 mm Hgâ€™. The equation that is used for calculating the value is given below:

PAO2=[Pa-PH2O]FIO2-PaCO2(1.25)

In this equation, PB is barometric pressure, PH2O is partial pressure of water vapor, FIO2 is fractional concentration of inspired oxygen, and PCO2 is the partial pressure of oxygen. The value 1.25 is used for adjusting the oxygen tension alteration that may be caused due to variations in the respiratory exchange ratio. The calculations using the aforementioned equation are given below:

PAO2=[725-47]0

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