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  • Question 1 - A 19-year-old with a longstanding history of asthma presents to the ED with...

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    • A 19-year-old with a longstanding history of asthma presents to the ED with worsening symptoms of cough and wheeze and a peak expiratory flow rate (PEFR) measurement is taken.

      Which statement concerning PEFR is true?

      Your Answer: PEFR is dependent upon the patient's height

      Explanation:

      The maximum flow rate generated during a forceful exhalation, after maximal inspiration is the peak expiratory flow rate (PEFR).

      PEFR is dependent upon initial lung volume. It is, therefore, dependant on patient’s age, sex and height.

      PEFR is dependent on voluntary effort and muscular strength of the patient.

      PEFR is decreased with increasing airway resistance, e.g. in asthma, and it correlates well with the forced expiratory volume in one second (FEV1) value measured in spirometry. This correlation decreases in patients with asthma as airflow decreases.

    • This question is part of the following fields:

      • Physiology
      • Respiratory Physiology
      23.5
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Physiology (1/1) 100%
Respiratory Physiology (1/1) 100%
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