The ventilator that can provide a negative pressure during the very beginning of the exhalation phase is which of the following?
a. Servoi
b. VIASYS Avea
c. Puritan Bennett 840
d. Cardiopulmonary Venturi
ANS: D
The Cardiopulmonary Venturi applies a negative pressure to the airway only during the very be-ginning of the exhalation phase. This facilitates removal of air from the patient circuit and is in-tended to reduce the resistance to exhalation throughout the circuit at the start of exhalation.
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