Management of Persistent Resting Tachycardia

Initial Diagnostic Approach

A 12-lead ECG is mandatory to characterize the rhythm and guide all subsequent management decisions, according to the American College of Cardiology 1, 2
Determine if the QRS complex is narrow (<120 ms) or wide (≥120 ms) to differentiate between types of tachycardia 3
For narrow complex tachycardia, assess P-wave morphology and relationship to QRS complexes to identify the underlying rhythm 3
Sinus tachycardia accelerates and terminates gradually, whereas supraventricular tachycardias have abrupt onset and termination, as noted by the American College of Cardiology 1, 2
Sinus tachycardia shows normal P-wave morphology identical to baseline sinus rhythm, according to the American College of Cardiology 4, 5
Irregular tachycardia suggests atrial fibrillation, multifocal atrial tachycardia, or frequent premature beats, as indicated by the American College of Cardiology 1, 2

For sinus tachycardia, immediately investigate stressors such as infection, volume depletion, anemia, hyperthyroidism, pheochromocytoma, pulmonary embolism, as recommended by the American College of Cardiology 1, 2
Medications (sympathomimetics, anticholinergics) and substances (caffeine, alcohol, nicotine, recreational drugs) can contribute to sinus tachycardia, according to the American College of Cardiology 3, 6

Primary management for confirmed sinus tachycardia is treating the underlying cause, as stated by the American College of Cardiology 4, 5
For inappropriate sinus tachycardia, beta-blockers are the recommended initial treatment, according to the American College of Cardiology 4, 5, 7
Non-dihydropyridine calcium channel blockers such as diltiazem or verapamil are effective alternatives when beta-blockers are contraindicated or not tolerated, as noted by the American College of Cardiology 4, 5, 6
Sinus node modification by catheter ablation should be considered only after medical therapy failure, with an acute success rate of approximately 76% and long-term success around 66%, as reported by the American College of Cardiology 4, 5, 6, 7

Persistent supraventricular tachycardia lasting weeks to months with fast ventricular response can cause tachycardia-mediated cardiomyopathy, a reversible form of heart failure if the tachycardia is controlled, as warned by the American College of Cardiology 1, 2

Do not initiate class I or III antiarrhythmic drugs without documented arrhythmia due to proarrhythmia risk, as cautioned by the American College of Cardiology 3
Do not rely on automatic ECG interpretation systems as they commonly suggest incorrect arrhythmia diagnoses, according to the American College of Cardiology 1, 2
Teach patients vagal maneuvers (Valsalva, carotid massage) as termination by these maneuvers suggests re-entrant tachycardia involving AV nodal tissue, as recommended by the American College of Cardiology 1, 2