Assessment and Management of Supraventricular Tachycardia

Clinical History and Diagnosis

• The American College of Cardiology recommends obtaining a detailed clinical history of episode characteristics, including number and frequency of episodes, duration of each episode, mode of onset, and specific triggers, in patients with known intermittent SVT 1
• The American College of Cardiology suggests that abrupt onset of symptoms suggests paroxysmal SVT rather than sinus tachycardia 2
• Patients with SVT may experience symptoms such as palpitations, chest discomfort, dyspnea, and fatigue, with syncope or near-syncope occurring in some cases 3

Diagnostic Testing

• A resting 12-lead ECG must be obtained at every visit to look for pre-excitation, conduction abnormalities, and evidence of prior myocardial infarction 2
• The American College of Cardiology recommends against relying on automated ECG interpretation due to its unreliability 2
• Echocardiography should be considered in all patients with documented sustained SVT to exclude structural heart disease 2, 4

Management

• The American Heart Association recommends teaching patients vagal maneuvers, such as modified Valsalva maneuver and carotid sinus massage, as a Class I recommendation 6, 7
• For symptomatic patients without pre-excitation, oral beta blockers, diltiazem, or verapamil are recommended as first-line therapy (Class I recommendation) 6, 7
• Catheter ablation is a Class I recommendation for diagnosis and potential treatment of SVT, with success rates of 94.3% to 98.5% for single procedure 6, 7

Follow-Up Plan

• The American College of Cardiology recommends arranging appropriate monitoring strategy based on episode frequency if no ECG documentation exists, and urgent electrophysiology referral if pre-excitation is identified 2
• Patients with symptomatic SVT despite medical therapy should be referred for ablation consideration, while asymptomatic patients on current therapy should continue current management with periodic reassessment 6