What are Palpitations?
 

Palpitations are the conscious awareness of heart beating, frequently described by patients as pounding, fluttering, racing, or skipping a beat.
 

• Frequency and Duration: Episodic, paroxysmal, or constant; lasting seconds, minutes, or hours.

• Associated Symptoms: Lightheadedness, presyncope, syncope, chest discomfort, shortness of breath, or anxiety.

Primary (Localized) Causes of Palpitations
 

• Supraventricular Arrhythmias: Premature atrial contractions (PACs), sinus tachycardia, paroxysmal supraventricular tachycardia (PSVT), atrial fibrillation, atrial flutter, and AV nodal re-entrant tachycardia (AVNRT).

• Ventricular Arrhythmias: Premature ventricular contractions (PVCs), nonsustained or sustained ventricular tachycardia (VT), and ventricular fibrillation.

• Structural & Valvular Heart Diseases: Mitral valve prolapse (MVP), hypertrophic cardiomyopathy (HCM), heart failure, congenital heart disease, and prior myocardial infarction (scar tissue).

• Conduction System Abnormalities: Wolf-Parkinson-White (WPW) syndrome and heart block.

Other Potential Causes or Risk Factors for Palpitations
 

• Endocrine & Metabolic Disorders: Hyperthyroidism, pheochromocytoma, hypoglycemia, and electrolyte imbalances (hypokalemia, hypomagnesemia, hypercalcemia).

• Substances & Medications: Caffeine, nicotine, alcohol, cannabis, illicit stimulants (cocaine, amphetamines), and prescribed/OTC medications (bronchodilators, decongestants, thyroid hormone replacement, anticholinergics).

• Systemic & Hemodynamic Factors: Fever, systemic infection, sepsis, acute anemia, hypovolemia, dehydration, and pregnancy.

• Psychological: Panic disorder, generalized anxiety disorder, stress, and somatization disorders.

Diagnostics
 

• History & Physical Examination: Characterizing the palpitation pattern, auscultation of heart sounds (murmurs, gallops, irregular rhythms), evaluation for signs of heart failure or thyroid disease, and orthostatic vital signs.

• Electrocardiography (ECG): 12-lead ECG to evaluate baseline rhythm, QT intervals, signs of ischemia, hypertrophy, or pre-excitation.

• Ambulatory Cardiac Monitoring:

  • 24-to-48-hour Holter monitors (for frequent daily symptoms).

  • Event monitors or mobile cardiac telemetry (MCT) for intermittent, less frequent episodes.

  • Implantable loop recorders (ILR) for infrequent, high-risk, or unexplained syncopal palpitations.

• Imaging Diagnostics: Transthoracic echocardiogram (TTE) to assess ejection fraction, chamber sizes, and valvular structures (such as mitral valve prolapse).

• Laboratory Testing:

  • Thyroid-stimulating hormone (TSH) and free T4.

  • Complete blood count (CBC) to check for anemia.

  • Comprehensive metabolic panel (electrolytes, renal function).

  • Cardiac biomarkers (troponin) if acute coronary syndrome is suspected.

• Advanced Testing: Electrophysiology study (EPS) or cardiac MRI when complex arrhythmias or structural abnormalities are strongly suspected.

Management 
 

Non-Pharmacological Management
 

• Vagal Maneuvers: Carotid sinus massage, valsalva maneuver, or facial immersion in ice water (to acutely terminate certain supraventricular tachycardias).

• Lifestyle Modification: Limiting or eliminating caffeine, alcohol, nicotine, and illicit substances; stress management; and adequate sleep hygiene.

• Catheter Ablation: Minimally invasive radiofrequency or cryoablation procedures to permanently eliminate pathways causing recurrent arrhythmias (e.g., atrial fibrillation, AVNRT, WPW, or symptomatic PVCs).

• Device Therapy: Implantable cardioverter-defibrillators (ICDs) or pacemakers for high-risk ventricular arrhythmias or conduction system disorders.

Pharmacological Management
 

• Antiarrhythmic Agents:

  • Beta-blockers (e.g., metoprolol, propranolol) or non-dihydropyridine calcium channel blockers (diltiazem, verapamil) for rate control and suppression

  • Antiarrhythmic drugs (e.g., flecainide, amiodarone) for specific dysrhythmias

• Targeted Condition Therapy:

  • Antithrombotic therapy (anticoagulation) for stroke risk reduction in atrial fibrillation based on risk scores (e.g., CHA2DS2-VASc).

  • Thyroid hormone regulation (antithyroid medications) for hyperthyroidism.

• Electrolyte Repletion: Correcting underlying serum potassium or magnesium deficiencies.

• Medication Reconciliation: Discontinuing or adjusting causative prescription medications, OTC stimulants, or herbal supplements.