The therapist is monitoring the flow, volume, and pressure scalars of a patient receiving mechanical ventilation. After the first exhalation, the therapist initiates an expiratory pause. Based on the pressure-time tracing in particular, what will the therapist observe?
A. plateau pressure
B. auto-PEEP
C. applied PEEP
D. applied and auto-PEEP
?ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response:
By performing an expiratory pause (EP), the therapist will be able to measure the intrinsic PEEP. The applied PEEP will be observed and measured with every breath without the therapist having to conduct any special maneuvers. The difference between the measurement obtained as a result of the expiratory pause and the applied PEEP will equal the auto-PEEP.
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