Source: Annual Congress 2004 - Lung function technology: beyond the basic test
Disease area: Respiratory critical care, Sleep and breathing disorders

Abstract

Despite the wide spread use of CPAP and PSV mode ventilators for patients with respiratory failure and sleep apnea, accurate assessment of their function with conventional test lung during spontaneous breathing mode remains difficult. A newly developed lung simulator, Jet Lung, (Yusan Medical Ltd) allows us to freely draw waveforms such as pressure and speed of spontaneous breathing by a mouse on the screen. Breathing corresponding to the waveforms is performed by controlling electromagnetic valves using both positive and negative pressure jets. To assess the usefulness of this simulator, we compared the difference between its output for actual inspiratory time (I, Time), tidal volume (Insp Vt) and observed values on a ventilator during CPAP (40 consecutive breaths )Insp Vt (ml), Sigh, 322 ± 1.71 vs 214 ± 3.06 (ALS5000 vs Jet L); RSB, 56.7 ± 3.21 vs 75.9 ± 2.11; Coughs, 224 ± 2.36 vs 243 ± 2.19. I, Time(sec), Sigh, 2.0 ± 0.02 vs 0.7 ± 0.22; RSB, 0.35 ± 0.03 vs 0.30 ± 0.02; Coughs, 0.98 ± 0.06 vs 1.56 ± 0.09. Unlike complex piston test lung, gas-controlled Jet Lung allowed us to operate in a stable manner even in an excessive breathing simulation. These finding suggests that this novel simulator may help test the fidelity of a given ventilator under spontaneous breathing.

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Citations should be made in the following way:
S. Fukasawa, J. Ueki, Y. Takahama, Y. Fukuchi (Tokyo, Japan). Comparison of the novel lung simulator and the conventional test lung ASL5000 during bi-level ventilation. Eur Respir J 2004; 24: Suppl. 48, 2490

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