A client diagnosed with atrial fibrillation is prescribed a calcium channel blocker to help control the ventricular rate. The nurse plans to monitor the client's cardiac rhythm strip for which change?
1. Widening of the QRS complex
2. Widening of the QT interval
3. Inverted T waves
4. Prolongation of the PR interval
Correct Answer: 4
Rationale 1: Calcium channel blockers do not widen the QRS.
Rationale 2: Calcium channel blockers do not widen the QT.
Rationale 3: Calcium channel blockers do not cause T wave changes.
Rationale 4: Prolonging the refractory period by calcium channel blockade causes prolongation of the PR interval.
Global Rationale: Prolonging the refractory period by calcium channel blockade causes prolongation of the PR interval. Calcium channel blockers do not widen the QRS or the QT and they don't cause T wave changes.
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