Source: Annual Congress 2002 - Auto-CPAP in sleep apnoea: clinical aspects
Disease area: Sleep and breathing disorders

Abstract

Some companies claim that their auto-CPAP devices are able to distinguish central respiratory events from obstructive ones by the built-in algorythm. We tested the performance of 2 of these devices during polysomnography: the SOMNOsmart - Weimann (SOMN) based on forced oscillation technique and the Goodknight418P - Mallinckrodt (GP) set not to react on apnoea with preserved cardiac oscillations. The results in 2 patients with central sleep apnoea syndrome were:

Man, 68 yr; history: cerebral bleeding, endoprothesis of the arcus aortae

	baseline	SOMNO	GP
		limits 4-10 mbar
apn+hypopn ind. NREM / REM	50 / -	43 / 3	58 / -
mean CPAP press. (mbar)	-	3.9	9.8
90th percentile CPAP press.(mbar)	-	4.5	>10
Man, 28 yr; history: epilepsy, mental retardation, psychiatric patient
	baseline	SOMNO	GP
		limits 4-8 mbar
apn+hypopn ind. NREM / REM*	32 / 0	37 / 2	27 / 0
mean CPAP press. (mbar)	-	4.3	6.5
90th percentile CPAP press.(mbar)	-	5	>8

* on acetazolamide: apnoea+hypopnoea ind. NREM / REM: 3 / 0 Conclusion: Central apnoeas were recognized by the SOMNOsmart: this device, measuring resistance based on the forced oscillation technique, did not increase pressure. The Goodknight418P, although set not to react on apnoeas+cardiac oscillations (central apnoeas), delivered needless high pressures.

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Citations should be made in the following way:
B. Buyse, M. Cauberghs, M. Demedts (Leuven, Belgium). The behaviour of 2 different auto-CPAP devices in central sleep apnoea. Eur Respir J 2002; 20: Suppl. 38, 171

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