Abstract
We assessed the effect of pressure support ventilation (PSV) on breathing patterns and the work of breathing in 10 postoperative patients. Minute ventilation ( {Mathematical expression}E) increased by 8% with 5 cm H2O PSV and 10% with 10 cm H2O PSV compared to 0 cm H2O PSV. The increase in {Mathematical expression}E was achieved by increased mean inspiratory flow (24% with 5 cm H2O PSV and 67% with 10 cm H2O PSV) and a decrease in duty cycle (13% with 5 cm H2O PSV and 39% with 10 cm H2O PSV). The decrease in duty cycle along with a decrease in respiratory frequency allowed a greater expiratory time including a rest period for the respiratory muscles, which might minimize the risk of muscle fatigue. Furthermore, the inspiratory work added by the ventilator was near zero with 5 cm H2O PSV and 10 cm H2O PSV. Oxygen consumption also decreased significantly with 5 cm H2O PSV. We conclude that PSV improves the breathing patterns and minimizes the work of breathing spontaneously via a ventilator.
Original language | English |
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Pages (from-to) | 491-494 |
Number of pages | 4 |
Journal | Intensive Care Medicine |
Volume | 15 |
Issue number | 8 |
DOIs | |
Publication status | Published - Dec 1 1989 |
Keywords
- Breathing pattern
- Pressure support ventilation
- Work of breathing
ASJC Scopus subject areas
- Critical Care and Intensive Care Medicine