Which of the following modes of ventilation can inappropriately set sensitivity cause asyn-chrony? 1. Volume A/C 2. Pressure A/C 3. PSV 4. NAVA

a. 1 and 3 only
b. 1, 2, and 3 only
c. 2 and 4 only
d. 1, 2, 3, and 4

ANS: B
Across all modes of ventilation, inappropriately set sensitivity, inappropriate selection of PEEP, and the presence of auto-PEEP result in asynchrony. The one exception to this is NAVA, since NAVA is controlled by the diaphragmatic EMG signal; the presence of auto-PEEP does not af-fect the function of this mode.