A patient in the emergency room is displaying prolong inspiratory gasps interrupted by occasional expirations, what serious injury should be suspected on this patient?
1. Pneumotaxic center has been severed.
2. Vagus nerve has been severed.
3. Glossopharyngeal nerve has been severed.
a. 2 and 3 only
b. 1 and 2 only
c. 1 and 3 only
d. 1, 2, and 3
ANS: B
If a situation occurs where the higher pneumotaxic center and vagus nerves were severed, the DRG inspiratory neurons would fail to switch off, causing prolonged inspiratory gasps inter-rupted by occasional expirations (apneustic breathing). Vagal and pneumotaxic center impulses hold the apneustic center's stimulatory effect on DRG neurons in check.
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