A client is admitted to the emergency department (ED) with new-onset atrial fibrillation. Which cardiac rhythm history would be a contraindication for the use of a sodium channel blocker antidysrhythmic medication?
1. Occasional premature ventricular contractions (PVCs)
2. Multiple premature atrial contractions (PACs)
3. Elevated blood sugar
4. Second-degree AV block
Correct Answer: 4
Rationale 1: Sodium channel blockers may be used to control PVCs.
Rationale 2: Sodium channel blockers may be used to control PACs.
Rationale 3: Sodium channel blockers do not have a direct correlation with blood sugar levels.
Rationale 4: Sodium channel blockers slow the action potential and delay conduction, therefore risking complete heart block and cardiac arrest if used on a client with a history of existing second- or third-degree block.
Global Rationale: Sodium channel blockers slow the action potential and delay conduction, therefore risking complete heart block and cardiac arrest if used on a client with a history of existing second- or third-degree block. Sodium channel blockers may be used to control PVCs, PACs, and do not have a direct correlation with blood sugar levels.
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