What is the nurse monitoring when observing the QRS complex on the electrocardiogram?
a. Ventricular activity
b. Pulmonary artery closure
c. Mitral valve opening
d. Aortic valve closing
ANS: A
The QRS complex represents the sum of all ventricular muscle cell depolarizations, not the clo-sure of the pulmonary artery. The QRS complex does not reflect activity of either the mitral or aortic valves.
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