Which ED procedure is used to restore normal heart rhythm in certain arrhythmias?

• A. Cardioversion
• B. Lumbar Puncture
• C. Conscious Sedation
• D. Incision and Drainage

Answer: (A)

Cardioversion is the ED procedure used to reset an abnormal heart rhythm back to normal. It delivers a controlled, synchronized electrical shock that is timed to the heart’s electrical cycle, typically near the QRS complex, so the rhythm is reset without triggering dangerous rhythms. This approach is particularly useful for rhythms like atrial fibrillation or atrial flutter with rapid rate, as well as certain stable tachycardias with a pulse when slower, more conservative measures aren’t sufficient. The synchronization is key: it ensures the shock hits at a safe moment rather than during a vulnerable phase, which distinguishes it from unsynchronized shocks used in life-threatening, pulseless situations. In the ED, cardioversion is usually performed under conscious sedation to minimize discomfort. After restoring rhythm, clinicians consider anticoagulation and long-term rhythm management based on the specific arrhythmia and how long it has been present.