Beneficial effects of using high inspiratory flows in patients with chronic airflow obstruction re-ceiving flow-limited mechanical ventilation include which of the following?
1. Decreased work of breathing
2. Improved gas exchange
3. Decreased auto-PEEP
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: D
Higher flow (up to 100 L/min) may improve gas exchange in chronic obstructive pulmonary dis-ease patients, probably because of the resulting increase in expiratory time.
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