A nurse is assessing a client who has a history of deep-vein thrombosis and is receiving warfarin

B. Vagal stimulation

Explanation: The nurse should identify that vagal stimulation might temporarily convert the client's heart rate to normal sinus rhythm. The nurse should have a defibrillator and resuscitation equipment at the client's bedside because vagal stimulation can cause bradydysrhythmias, ventricular dysrhythmias, or asystole.

The nurse should identify that cardioversion, rather than defibrillation, is used to treat supraventricular tachycardia. Defibrillation is used to treat ventricular fibrillation or pulseless ventricular tachycardia. The nurse should identify that atropine is used to treat bradydysrhythmias. Supraventricular tachycardia does not require atropine. The nurse should identify that a precordial thump is used for witnessed ventricular tachycardia if a defibrillator is unavailable. Supraventricular tachycardia does not require a precordial thump.