Diagnostic Approach for Palpitations

Indications for Treadmill Stress Testing

The American College of Cardiology/American Heart Association gives a Class IIa recommendation for exercise stress testing when patients experience palpitations or syncope specifically during exertion, as this can unmask life-threatening conditions including hypertrophic obstructive cardiomyopathy, long QT syndrome type 1, catecholaminergic polymorphic ventricular tachycardia, and anomalous coronary arteries 1, 2
Exercise testing is specifically indicated for young adults with exertional tachycardia and dizziness because exertional symptoms can reveal serious cardiac channelopathies and structural abnormalities that may not be apparent at rest 2
Stress testing can reproduce symptoms and identify the underlying rhythm disturbance when the clinical history strongly suggests that palpitations are triggered by physical activity 2

Cardiac rhythm monitoring—not stress testing—is the appropriate diagnostic modality for palpitations, and the choice of monitoring system depends on how often palpitations occur 1, 2
A 12-lead ECG during both symptomatic episodes and at rest is mandatory as the initial test to identify baseline abnormalities including pre-excitation patterns, QT prolongation, or Brugada pattern 2
Holter monitoring, event recorders, external loop recorders, patch recorders, or mobile cardiac outpatient telemetry should be selected based on symptom frequency and the likelihood of capturing an event during the monitoring period 1

ECG stress testing was useful in identifying the cause of tachyarrhythmia in only 2 out of 433 patients evaluated, highlighting the limitations of stress testing in diagnosing palpitations 1

The American College of Cardiology/American Heart Association recommends immediate exercise testing if palpitations occur specifically during or immediately after exercise, or if associated with syncope or near-syncope with exertion 2
Young age (<40 years) with exertional symptoms suggesting inherited arrhythmia syndromes, or family history of sudden cardiac death with exertional symptoms, are also indications for immediate stress testing 2