The therapist has been asked to evaluate a mechanically ventilated patient for weaning. Why would the therapist use an esophageal balloon for this procedure?
A. to measure the patient's maximum inspiratory effort
B. to obtain the pressure-time index
C. to estimate the patient's intrapleural pressure
D. to evaluate the patient's accessory muscle use
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: An esophageal balloon is used to measure esophageal pressure (Pes), which is an estimate of the patient's intrapleural pressure. The Pes is needed to access patient muscle loads. Muscle loads can be expressed as either work or pressure-time products (PTPs) per breath.
D. Incorrect response: See explanation C.
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