Which of the following is the function of the transducer in the invasive vascular monitoring sys-tem?
a. Measure the flow of fluid in the catheter.
b. Convert the fluid pressure to an electrical signal.
c. Connect to the thermistor to measure car-diac output.
d. Amplify the electrical signal so it may be seen on the monitor.
ANS: B
The transducer has two main compartments. One, called the dome, contains the fluid that enters it from a plastic line connected to the indwelling catheter. The dome is separated from the elec-trical portion of the transducer by a flexible diaphragm. Changes in fluid pressure result in movement of the diaphragm, which causes an increase or decrease in the length of the wires of the Wheatstone bridge contained in the electrical portion of the transducer. The transducer is therefore able to detect small physiological signal changes and convert them to electrical impulses or signals.
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