قبل صدمة متزامنة لمريض رجفان أذيني غير مستقر، ما الخطوة التي يتأكد منها الممرض في الجهاز؟

Before synchronised cardioversion for unstable AF, what does the nurse confirm on the device?

1. Sync mode is on and markers appear on the R waves
2. Sync mode is turned off so the shock is delivered faster
3. The pacemaker is set to demand mode
4. Energy is reduced below 10 joules

Answer: A) Sync mode is on and markers appear on the R waves. Sync mode times the shock to the R wave and avoids the T wave, where a shock can trigger VF. Many devices drop sync after each shock, so it is re-enabled before the next.