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

2. The patient has an irregular heart rhythm. To determine an accurate heart rate, the nurse first:

a. identifies the markers on the ECG paper that indicate a 6-second strip.

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