Although adenosine is generally a benign drug, it can have adverse side effects When administering adenosine the provider should be prepared for defibrillation, external pacing, or airway management FIGURE 86.1 Narrow complex tachycardia and adenosine response SVT, supraventricular tachycardia; AVNRT, atrioventricular nodal re-entrant tachycardia; AV, atrioventricular; VT, ventricular tachycardia; NSR, normal sinus rhythm; AVRT, atrioventricular reentrant tachycardia