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Comparative Study
. 2016 Jan;127(1):565-570.
doi: 10.1016/j.clinph.2015.06.009. Epub 2015 Jun 16.

Two Subtypes of Positional Obstructive Sleep Apnea: Supine-predominant and Supine-Isolated

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Comparative Study

Two Subtypes of Positional Obstructive Sleep Apnea: Supine-predominant and Supine-Isolated

Keun Tae Kim et al. Clin Neurophysiol. .

Abstract

Objectives: The body position has a strong influence on obstructive sleep apnea (OSA). The purpose of this study is to compare the clinical features of two subtypes of positional OSA (POSA), namely supine-predominant OSA (spOSA) and supine-isolated OSA (siOSA), so as to discuss whether the two groups can be classified separately.

Methods: A total of 279 consecutive patients with OSA were enrolled. The POSA was defined as having an overall apnea-hypopnea index (AHI) ⩾ 5 with supine AHI > 2 times the non-supine AHI. Only those with ⩾ 30 min spent in the supine and non-supine sleeping positions were included, and split night studies were excluded from the study. Patients were considered spOSA unless their non-supine AHI was negligible (<5) (siOSA). The clinical and polysomnographic characteristics of both groups were compared.

Results: Two hundred and sixteen subjects (77.4%) met the criteria for POSA, with 158 (73.1%) of them classified as spOSA, and 58 (26.9%) as siOSA. The siOSA patients had lower arousal indices, but poorer quality of sleep, and were more depressed and anxious compared with the spOSA subjects.

Conclusions: Those with siOSA and spOSA show different clinical features.

Significance: These findings suggest that a more detailed sub-classification of POSA is needed.

Keywords: OSA classification; Obstructive sleep apnea; Positional obstructive sleep apnea; Supine OSA.

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