Diagnostic Approach to Palpitations

Initial Evaluation

The American College of Cardiology recommends a 12-lead ECG as an essential first step for all patients with palpitations to identify baseline abnormalities and potential causes 3, 4
A detailed history focusing on specific characteristics of palpitations, including onset and termination, duration and frequency of episodes, associated symptoms, precipitating factors, and pattern of palpitations, is crucial for diagnosis 5, 6
The European Heart Journal suggests that a physical examination should assess for signs of structural heart disease or thyroid dysfunction 8

The European Heart Journal recommends 48-hour ambulatory ECG monitoring for patients with frequent or sustained palpitations to identify the likely cause 1, 2
The American College of Cardiology suggests that echocardiography should be considered in patients with documented sustained palpitations to exclude structural heart disease 5, 6, 8
For frequent episodes, 24-48 hour Holter monitoring is recommended, while for less frequent episodes, an event recorder or wearable loop recorder may be used, and for rare episodes, an implantable loop recorder may be considered 1, 2, 5, 6

Exercise testing is recommended when palpitations are triggered by exertion, according to the American College of Cardiology and Circulation 4, 8
Extended monitoring (>24 hours) is recommended for patients who develop palpitations or lightheadedness, as suggested by the Journal of the American College of Cardiology and Circulation 3, 4
Laboratory tests are only indicated if volume depletion or metabolic causes are suspected, according to the European Heart Journal 7, 9

The American College of Cardiology recommends that patients with pre-excitation on resting ECG and a history of paroxysmal regular palpitations should be referred to electrophysiology 5, 6
Patients with structural heart disease require more intensive evaluation, including echocardiography, prolonged ECG monitoring, and possibly electrophysiological studies, as suggested by the European Heart Journal 7, 9

The American College of Cardiology recommends specialist referral for patients with wide complex tachycardia of unknown origin, narrow complex tachycardia with drug resistance or intolerance, Wolff-Parkinson-White syndrome, severe symptoms during palpitations, or suspected structural heart disease 5, 6

The Journal of the American College of Cardiology and Circulation suggest that patients with hypertrophic cardiomyopathy (HCM) and palpitations should have 12-lead ECG and 24-48 hour ambulatory monitoring every 1-2 years 3, 4
For patients with frequent palpitations where no cause is identified after prolonged ECG monitoring, an implantable loop recorder may be considered, according to the European Heart Journal 1, 2