During a pulmonary function study, it was found that a patient has a sawtooth pattern on his flow-volume loop. What is this finding associated with?
a. Central sleep apnea
b. COPD
c. Obstructive sleep apnea
d. Laryngeal edema (epiglottitis)
C
An inspiratory sawtooth pattern on the flow-volume loop is associated with obstructive sleep apnea. The sawtooth pattern is caused by loose tissues in the throat moving during the rapid inspiration. Patients with COPD have a distinctively slow expiratory flow pattern. A patient with laryngeal edema (epiglottitis) will often have a distinctive inspiratory stridor sound.
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