The sawtooth sign is predictive of obstructive sleep apnea.

CONCLUSIONS: Patients with the sawtooth sign have greater odds of having a diagnosis of OSA compared with those without the sign. If prospectively evaluated, as a result of improved identification, we hypothesize that the sawtooth sign may show an even stronger association with OSA. This relatively common finding, which adds no cost to routine spirometry, may serve as an indicator for OSA workup for some individuals not already identified as having OSA. PMID: 27900657 [PubMed - as supplied by publisher]
Source: Sleep and Breathing - Category: Sleep Medicine Authors: Tags: Sleep Breath Source Type: research