Which of the following represents the port on a pulmonary artery catheter used to take measure-ments that estimate right-ventricular end-diastolic pressure?
a. Distal c. Proximal
b. Balloon d. Thermistor
ANS: C
The proximal port of a pulmonary artery catheter rests in the right atrium and is used to obtain central venous pressure. Central venous pressure is used to estimate the right-ventricular end-diastolic pressure. The distal port is used to measure pulmonary artery pressure. The distal port is also used to measure the pulmonary artery wedge pressure, which is an estimation of left-ventricular end-diastolic pressure. The thermistor is used to measure cardiac output.
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