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Sleep Centre, Royal Infirmary NHS Trust, Edinburgh, Scotland, UK
CORRESPONDENCE: N.J. Douglas, Dept of Medicine, Royal Infirmary NHS Trust, Lauriston Place, Edinburgh, EH3 9YW, Scotland, UK. Fax: 44 1315363255. E-mail: n.j.douglas@ed.ac.uk
Keywords: limited home studies, sleep apnoea diagnosis
Received: November 27, 2001
Accepted May 3, 2002
Waiting times for hospital-based monitoring of the obstructive sleep apnoea/hypopnoea syndrome (OSAHS) are rising. This study tested whether Embletta, a new portable device, may accurately diagnose OSAHS at home.
A synchronous comparison to polysomnography was performed in 40 patients and a comparison of home Embletta studies with in-laboratory polysomnography was performed in 61 patients.
In the synchronous study, the mean difference (polysomnography–Embletta) in apnoeas+hypopnoeas (A+H)·h–1 in bed was 2·h–1. In comparison to the apnoea/hypopnoea index (AHI)·h–1 slept, the Embletta (A+H)·h–1 in bed differed by 8·h–1. These data were used to construct diagnostic categories in symptomatic patients from their Embletta results: "OSAHS" (
Most patients were satisfactorily classified by home Embletta studies but 29 out of 61 required further investigation. The study suggested a 42% saving in diagnostic costs over polysomnography if this approach were adopted.
20 (A+H)·h–1 in bed), "possible OSAHS" (10–20 (A+H)·h–1 in bed) or "not OSAHS" (<10 (A+H)·h–1 in bed). In the home study, the mean difference in (A+H)·h–1 in bed was 3·h–1. In comparison to the polysomnographic AHI·h–1 slept, the Embletta (A+H)·h–1 in bed differed by 6±14·h–1. Using the above classification, all nine patients categorised as not OSAHS had AHI <15·h–1 slept on polysomnography and all 23 with OSAHS on Embletta had an AHI 15 on polysomnography, but 18 patients fell into the possible OSAHS category potentially requiring further investigation and 11 home studies failed.
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