Which of the following factors affects the consumption of source gas (O2) during the operation of mechanical ventilators that are pneumatically or fluidically controlled? I. PEEP II. pulmonary compliance III. set minute ventilation IV. Fio2
A. I only
B. IV only
C. II, III only
D. I, II, III, IV
ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: Under ideal conditions, all gas leaving the O2 source is delivered to the patient. However, in pneumatically or fluidically controlled ventilators, these control circuits often consume gas to power inspiration and expiration. Gas consumption is defined as gas used by the ventilator for operating circuits or valves, which is exhausted into the atmosphere and not delivered to the patient.
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