Abstract
We compared lung mechanics and EMG amplitude and duration of 11 rabbits during IMV and SIMV (Star Sync®), before and during resistive loading. SIMV response time was 50 ±13 msec. We recorded airway flow, pleural pressure, lung volume (jacket plethysmograph) and EMG (needle electrodes In the diaphragm). We computed compliance (C), resistance (R), Inspiratory work (W) and tidal volume (TV) for mechanical breaths.
End-expiratory lung volume did not vary. Baseline C, W and TV, and loaded R and W were greater on SIMV. EMG dur. and amp. (% of baseline IMV) were significantly less on SIMV than on IMV. This suggests that ventilator efficiency is increased and diaphragmatic effort is spared by SIMV compared to IMV.
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Rosas, J., Cleary, J., Mannino, F. et al. DIAPHRAGMATIC EFFORT AND LUNG MECHANICS ON CONVENTIONAL AND SYNCHRONIZED INTERMITTENT MANDATORY VENTILATION (IMV/SIMV). Pediatr Res 32, 633 (1992). https://doi.org/10.1203/00006450-199211000-00173
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DOI: https://doi.org/10.1203/00006450-199211000-00173