What happens during the exsufflation phase of mechanical insufflation-exsufflation?
1. Airway pressure is abruptly decreased to ?30 to ?50 cm H2O.
2. Negative airway pressure is maintained for 2 to 3 sec.
3. Peak expiratory "cough" flows reach near normal values.
a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2, and 3
ANS: D
The airway pressure is then abruptly reversed to −30 to −50 cm H2O and maintained for 2 to 3 sec. Peak expiratory "cough" flows obtained with this device are in the normal range (mean of 7.5 L/sec), far better than that can be achieved with manually assisted coughing.
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