Diagnostic Approach to Palpitations

Initial Evaluation

The American College of Cardiology recommends obtaining a 12-lead ECG as the essential first diagnostic step for all patients with palpitations to identify baseline abnormalities and potential arrhythmias 2
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 2
The European Society of Cardiology suggests performing a physical examination to assess for signs of structural heart disease or thyroid dysfunction 2
The pattern of palpitations, including regular vs. irregular, can help guide further diagnosis and management 2, 3

For frequent episodes, 24-48 hour Holter monitoring is recommended by the American Heart Association 1, 2
For less frequent episodes, an event recorder or wearable loop recorder is more appropriate, as suggested by the European Heart Rhythm Association 1, 2
For rare episodes, an implantable loop recorder may be considered, according to the Heart Rhythm Society 1, 2

Targeted blood tests, including complete blood count, serum electrolytes, thyroid-stimulating hormone, and fasting blood glucose or glycohemoglobin, should be ordered based on clinical assessment, as recommended by the American College of Cardiology 1
The American Association for Clinical Chemistry suggests considering these essential laboratory tests to rule out underlying conditions that may be contributing to palpitations 1

Echocardiography should be performed if structural heart disease is suspected, as recommended by the American Society of Echocardiography 1, 2
Exercise testing is recommended when palpitations are triggered by exertion, according to the American College of Sports Medicine 2
Extended monitoring (>24 hours) is recommended for patients who develop palpitations or lightheadedness, as suggested by the Heart Rhythm Society 2

Patients with pre-excitation on resting ECG and a history of paroxysmal regular palpitations should be referred to electrophysiology, as recommended by the European Heart Rhythm Association 2
Wide-complex tachycardia may represent either ventricular tachycardia or supraventricular rhythm with abnormal conduction, and correct identification is critical, according to the American Heart Association 3
Patients with structural heart disease require more intensive evaluation, including echocardiography, prolonged ECG monitoring, and possibly electrophysiological studies, as suggested by the American College of Cardiology 2

Wide complex tachycardia of unknown origin requires specialist referral, as recommended by the Heart Rhythm Society 2
Narrow complex tachycardia with drug resistance or intolerance requires specialist referral, according to the European Heart Rhythm Association 2
Wolff-Parkinson-White syndrome requires specialist referral, as suggested by the American Heart Association 2
Severe symptoms during palpitations, such as syncope or presyncope, require specialist referral, according to the American College of Cardiology 2, 3
Suspected structural heart disease requires specialist referral, as recommended by the American Society of Echocardiography 2