Diagnostic Approach and Management of Asymptomatic Tachycardia

Diagnostic Evaluation

A 12-lead ECG is used to determine the type of tachycardia, including sinus, atrial, junctional, or ventricular tachycardia, according to the American College of Cardiology 1
Careful review of P-wave morphology, PR interval, and QRS complex is necessary to distinguish between supraventricular and ventricular origins, as recommended by the American College of Cardiology and the American Heart Association 1, 2
Complete blood count is performed to rule out anemia, which can cause tachycardia, as suggested by the American College of Cardiology 1
Electrolyte panel, particularly potassium and magnesium, is checked to identify potential electrolyte imbalances that may contribute to tachycardia, according to the American Heart Association 3
Thyroid function tests are conducted to exclude hyperthyroidism as a cause of tachycardia, as recommended by the American College of Cardiology 1
Echocardiogram is used to assess for structural heart disease, which can be a cause or result of tachycardia, as suggested by the American College of Cardiology and the American Heart Association 1, 4

The American College of Cardiology recommends treating underlying conditions such as hyperthyroidism, anemia, dehydration, pain, or anxiety to manage asymptomatic tachycardia 1
Discontinuing exogenous substances that may cause tachycardia, such as caffeine, stimulants, or certain medications, is advised by the American College of Cardiology 1
For inappropriate sinus tachycardia, beta blockers or non-dihydropyridine calcium channel blockers are first-line treatments, as recommended by the American College of Cardiology 1
For supraventricular tachycardia, beta blockers, diltiazem, or verapamil are first-line agents, according to the American College of Cardiology and the American Heart Association 1, 2
Catheter ablation is considered for definitive treatment of supraventricular tachycardia, especially in recurrent cases, as suggested by the American College of Cardiology and the American Heart Association 1, 2
For asymptomatic pre-excitation, risk stratification with noninvasive testing or EP study is reasonable, and catheter ablation is considered if high risk of arrhythmic events is identified, according to the American Heart Association and the American College of Cardiology 5, 6, 8
Aggressive control of heart rate or rhythm is indicated if there is evidence of tachycardia-induced cardiomyopathy, and standard heart failure therapy is used to attenuate adverse remodeling, as recommended by the American Heart Association 4