   Chapter 2, Problem 16RQ

Chapter
Section
Textbook Problem

If a patient produces a flow rate of 5 L/sec during a forced exhalation by generating a transrespiratory pressure of 20 cm H 2 O , what is the patient's R aw ?A. B. 2 cm H 2 O/L\sec C. 3 cm H 2 O/L\sec D. 4 cm H 2 O/L\sec

Summary Introduction

Introduction:

Airway resistance (Raw) is defined as the difference in pressure between the mouth and the alveoli (transrespiratory pressure) divided by the flow rate. Mathematically, it is expressed by:

Raw=ΔP(cmH2O)V(L/sec)

Explanation

Explanation/justification for the correct answer:

Option (d) is 4 cm H2OL/sec. This is true because 20 cm H2O (cm refers to centimeter, while H2O is the chemical formula for water) divided by 5 L/sec (liter per second) gives 4 cm H2OL/sec. Airway resistance (Raw) is

=20 cm H2O5L/sec=4 cm H2OL/sec.

Hence, option (d) is the correct answer.

Explanation for incorrect answer:

Option (a) is 1 cm H2OL/sec

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