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Effects of change in the expiratory trigger during pressure support ventilation in COPD
Critical Care volume 10, Article number: P39 (2006)
During pressure support ventilation (PSV) the ventilator cycles from inspiration to expiration when the inspiratory flow reaches a given percentage of the peak inspiratory flow 'expiratory trigger' (ET). On the most recent available ventilators it is possible to modify the percentage of the ET.
We evaluated in a group of COPD patients during PSV the change of ET (high 40% and low 5% of the peak inspiratory flow, respectively) in terms of the pattern of breathing and inspiratory effort (pressure time product [PTP]).
Materials and methods
Nine COPD patients were studied during respiratory failure (PaO2/FiO2 295 ± 108, PEEP 6.2 ± 1.7 cmH2O, mean age 70 ± 2 years, and BMI 25.4 ± 4.3). PSV was set at 5 cmH2O without PEEP while the oxygen fraction remained constant during the study. Airway, esophageal, gastric pressures and airflow were measured.
See Table 1.
The change of percentage of ET at a low level of PSV did not modify the inspiratory effort and pattern of breathing.
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Chiumello, D., Raimondi, N., Cressoni, M. et al. Effects of change in the expiratory trigger during pressure support ventilation in COPD. Crit Care 10, P39 (2006). https://doi.org/10.1186/cc4386
- Public Health
- Emergency Medicine
- Respiratory Failure
- Pressure Time