Elsevier

The Lancet

Volume 339, Issue 8789, 8 February 1992, Pages 347-350
The Lancet

CLINICAL PRACTICE
Clinical value of polysomnography

https://doi.org/10.1016/0140-6736(92)91660-ZGet rights and content

Abstract

Polysomnography is used increasingly to investigate patients with possible sleep apnoea/ hypopnoea syndrome (SAHS), but it has not been assessed critically. We thus examined prospectively the value of electrophysiological and respiratory monitoring in 200 consecutive adults (163 men, 37 women; mean [SD] age 50 [13] years) having polysomnography. At polysomnography, 91 patients had SAHS (>15 apnoeas+hypopnoeas [A+H] per h asleep) and 11 had periodic limb-movement disorder. Recording sleep electrophysiologically was of no diagnostic value and SAHS could be as accurately defined by A + H per time in bed as by A + H per time asleep. 66% of patients with SAHS could bediagnosed with oximetryalone, but many of the undiagnosed patients had moderately severe SAHS and benefited from treatment. Neurophysiological sleep recording is unnecessary and oximetry alone is of limited value in the overnight investigation of patients suspected of having SAHS.

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