Premium
Effectiveness of pressure support ventilation for mechanical ventilatory support in patients with status asthmaticus
Author(s) -
Tokioka H.,
Saito S.,
Takahashi T.,
Kinjo M.,
Saeki S.,
Kosaka F.,
Hirakawa M.
Publication year - 1992
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1992.tb03413.x
Subject(s) - medicine , pressure support ventilation , hypercarbia , anesthesia , tidal volume , ventilation (architecture) , respiratory acidosis , respiratory minute volume , airway , mechanical ventilation , respiratory system , acidosis , mechanical engineering , engineering
We compared the effects of pressure support ventilation (PSV) with those of assist control ventilation (ACV) on breathing patterns and blood gas exchange in six patients with status asthmaticus. Both PSV and ACV delivered adequate minute ventilation (PSV: 7.5 ± 1.4 l/min/m 2 , ACV: 7.3 ± 1.3 l/min/m 2 ) to correct respiratory acidosis (pH = 7.33 ± 0.12 during both PSV and ACV) and prevent hypoxia. Peak airway pressure during PSV was significantly lower with the same tidal volume than that during ACV (PSV: 30 ± 10 cmH 2 O (2.9 ± 1.0 kPa), ACV: 50 ± 13 cmH 2 O (4.9 ± 1.3 kPa)). The lower airway pressure during PSV was due to persistent inspiratory muscle activity. The oxygen cost of breathing estimated by oxygen consumption was equivalent in both modes. We conclude that PSV is effective in supplying tidal volumes adequate to improve hypercarbia at markedly lower airway pressures than ACV.