Practice Quiz

NCLEX-RN

Category - Reduction of Risk

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Jean, a client with chronic asthma, had a pulmonary function test. The results of the test showed that the client’s maximal voluntary ventilation is lower than the normal. This laboratory result represents:
  1. An important factor in exercise tolerance
  2. A large obstruction in the airway
  3. A small obstruction in the airway
  4. An important indicator of air trapping
Explanation
Answer: A - This number represents the volume of air expired in a specified period, usually 12 seconds, during repetitive maximal effort. This is an important indicator of exercise tolerance. If the nurse wants to learn if there is a large airway obstruction, they should evaluate the forced expiratory flow. Small airway obstruction can be determined by changes in forced mid-expiratory flow, while obstruction in the smallest airway is determined by changes in forced end expiratory flow. The most useful parameter to determine air trapping is the forced vital capacity which is done by forcing expiratory effort.
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