Diagnostic Approach to Palpitations

Initial Evaluation

The European Heart Journal recommends 48-hour ambulatory ECG monitoring for patients with frequent or sustained palpitations 1
The American College of Cardiology suggests that brain natriuretic peptide (BNP) and high-sensitivity troponin may be considered if cardiac cause is suspected, though their usefulness is uncertain 2
Targeted blood tests should be ordered based on clinical assessment from history, physical examination, and ECG findings rather than routine comprehensive laboratory testing, as recommended by the American College of Cardiology 2

The European Heart Journal recommends 48-hour ambulatory ECG monitoring for patients with frequent or sustained palpitations 1
For patients with less frequent episodes, an event recorder or implantable loop recorder may be more appropriate, according to the European Heart Journal 1
The American College of Cardiology suggests that an implantable cardiac monitor can be useful for selected ambulatory patients with syncope or palpitations of suspected arrhythmic etiology 2, 1

Routine and comprehensive laboratory testing has been shown to be not useful in the evaluation of patients with syncope or palpitations, as stated by the American College of Cardiology 2
The American College of Cardiology recommends against ordering excessive laboratory tests that are unlikely to yield diagnostic information 2

The choice of cardiac monitor should be determined based on the frequency and nature of syncope events, according to the American College of Cardiology 2
For patients with frequent palpitations, a Holter monitor is appropriate, as suggested by the American College of Cardiology 2
For infrequent episodes, external loop recorders, patch recorders, or mobile cardiac outpatient telemetry may be more useful, according to the American College of Cardiology 2

The American Heart Association recommends complete blood count to assess for anemia which can precipitate palpitations 3
The American Heart Association suggests serum electrolytes including calcium and magnesium to identify electrolyte disturbances that can trigger arrhythmias 3, 4
The American Heart Association recommends thyroid-stimulating hormone to rule out hyperthyroidism as a cause of palpitations 3, 4
The American Heart Association recommends fasting blood glucose or glycohemoglobin to identify hypoglycemia or diabetes 3
The European Society of Cardiology recommends 12-lead electrocardiogram to identify any underlying arrhythmias or structural abnormalities 5, 6

The European Society of Cardiology suggests echocardiography if there is suspicion of structural heart disease 5, 6
The European Society of Cardiology recommends event recorder or implantable loop recorder for patients with infrequent episodes 7
The European Society of Cardiology recommends stress testing for patients with palpitations during or after exertion 5, 6
The European Society of Cardiology suggests carotid sinus massage for older patients or those with palpitations during neck turning 5, 6

The European Society of Cardiology recommends an implantable loop recorder for patients with recurrent unexplained palpitations who are at low risk for sudden cardiac death 7
The European Society of Cardiology suggests follow-up testing should be guided by initial test results and the persistence of symptoms 5

The American College of Cardiology recommends complete blood count, urinalysis, serum electrolytes, blood urea nitrogen, serum creatinine, fasting blood glucose, lipid profile, liver function tests, and thyroid-stimulating hormone as part of the initial laboratory evaluation for patients presenting with palpitations 8, 9
Blood urea nitrogen and serum creatinine should be assessed to evaluate renal function in patients with palpitations 8, 9
Fasting blood glucose or glycohemoglobin should be evaluated to identify hypoglycemia or diabetes in patients with palpitations 8
Liver function tests should be performed to evaluate hepatic function in patients with palpitations 8, 9
Urinalysis should be conducted for basic screening in patients with palpitations 8, 9
A 12-lead electrocardiogram should be performed to identify any underlying arrhythmias or structural abnormalities in patients with palpitations 8, 9

Chest radiograph (posterior-anterior and lateral) should be performed during the initial evaluation of patients with palpitations 8, 9
Two-dimensional echocardiography with Doppler should be considered if there is suspicion of structural heart disease in patients with palpitations 8

Routine comprehensive laboratory testing is not useful in the evaluation of patients with palpitations; instead, targeted blood tests should be ordered based on specific clinical suspicion from the history, physical examination, and ECG findings, as recommended by the American College of Cardiology 10

Brain natriuretic peptide (BNP) and high-sensitivity troponin may be considered if a cardiac cause is suspected, though their usefulness remains uncertain in this population, according to the American College of Cardiology 10

Laboratory testing is most valuable when loss of circulating volume is suspected (dehydration, bleeding) or metabolic causes are suggested by history (thyroid symptoms, medication use, substance use), as noted by the European Heart Journal 11

48-hour ambulatory ECG monitoring is recommended for patients with frequent or sustained palpitations, and event recorders or implantable loop recorders are suggested for infrequent episodes, as recommended by the European Heart Journal 12
Echocardiography should be performed when structural heart disease is suspected based on history, exam, or ECG findings, as suggested by the European Heart Journal 11