Respiratory Therapist

Category - Patient Evaluations and Recommendations

A PFT reveals an expiratory curve with a concave shape and is consistent with which condition?
  1. Cystic fibrosis
  2. COPD
  3. Asthma
  4. Normal lung function
Explanation
Answer: B -A COPD patient’s PFT will have a concave or dished out shape on exhalation. The flows are limited due to a decreased diameter of medium and small airways. The decreased medium and small airway flow is revealed as a concave shape on loop.
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