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

Abstract

Autoset-CS (ACS) (Resmed) has been designed to treat the Cheyne-Stokes breathing pattern of breathing in cardiac patients. However, as in most of these patients the Cheyne-Stokes breathing pattern and obstructive events coexist, we have analyzed the behavior of ACS not only in the presence of periodic breathing, but also in the presence of obstructive apneas, hypopneas and snoring. We assessed the performance of an ACS device by using a model that consisted on a computer-controlled breathing waveform generator based on a servocontrolled pump able to reproduce any flow breathing waveform stored in the computer. We recorded flow and pressure. In the presence of central apneas, ACS increased the tidal volume quickly during the apnea periods (in a breath by breath basis) to maintain tidal volume slightly below the previous normal breaths. When the ACS was tested in response to obstructive apneas, the inspiratory but not the expiratory pressure was increased by the ACS device. In the presence of hypopneas, the ACS device increased the inspiratory pressure trying to compensate the volume reduction. Conceivably, setting a fixed expiratory pressure to avoid obstructive apneas could allow the ACS device to correct not only the Cheyne-Stokes breathing but also obstructive hypopneas.
Supported in part by SEPAR 2000, CICYT-SAF 99-0001.

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Citations should be made in the following way:
J. M. Montserrat, R. Farré, F. Rico, L. Hernandez, E. Ballester, D. Navajas (Barcelona, Spain). Behaviour of autoset-CS in response to Cheyne-Stokes and obstructive events. A bench study. Eur Respir J 2002; 20: Suppl. 38, 173

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