8. The QT interval is the total time taken for ventricular depolarization and repolarization.
Prolongation of the QT interval:
a. decreases the risk of lethal dysrhythmias.
b. usually occurs when heart rate increases.
c. increases the risk of lethal dysrhythmias.
d. can only be measured with irregular rhythms.
ANS: C
9. The patient has an irregular heart rhythm. To determine an accurate heart rate, the nurse first:
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