Management of paroxysmal supraventricular tachycardia.

Three forms of treatment are available for patients with paroxysmal supraventricular tachycardia (PSVT): nonpharmacologic, pharmacologic, and electrical. Nonpharmacologic treatments increase vagal tone and include the traditional carotid sinus massage and Valsalva maneuver as well as head-down tilt, activation of the diving reflex, and use of the pneumatic antishock garment. The most effective currently available pharmacologic agent is verapamil. Hemodynamically stable patients whose PSVTs are refractory to verapamil may be treated with digitalis. Patients with antegrade accessory pathway conduction (such as those with Wolff-Parkinson-White syndrome) and a history of atrial fibrillation should be treated with intravenous procainamide if they are hemodynamically stable and with synchronized electrical countershock if they are hemodynamically unstable. Synchronized electrical countershock is the treatment of choice for hemodynamically unstable patients.