In this issue of CHEST (see page 353), Le Bon et al report
the largest series to date of consecutive polysomnograms (PSGs) in
patients suspected of having the obstructive sleep apnea-hypopnea
syndrome (OSAHS). The authors conclude that a single negative PSG does
not exclude a diagnosis of OSAHS. The evidence provided plus a
review of the literature strongly supports this conclusion for any
apnea-hypopnea index (AHI) that is considered to be clinically relevant
below an AHI of 20.