A respiratory therapist is monitoring a continuous flow CPAP device set at 8 cm H2O. With each inspiration from the patient the monitored pressure drops from 8 cm H2O to 3 cm H2O but then returns to 10 cm H2O during expiration. Which of the following is the best explanation for this observation?
A. the patient is in need of Bi-level therapy
B. gas flow to the patient is insufficient
C. leak in the mask
D. normal operation
Ans: B. CPAP is intended to deliver a continuous amount of positive airway pressure. When the pressure falls below the set pressure during inspiration, it is an indication that flow rate to the system is insufficient.
Health Professions
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