Symptom Combination

Loss Of Consciousness and Palpitations: Causes, Conditions & When to See a Doctor

Loss of consciousness preceded or followed by palpitations strongly suggests a life-threatening arrhythmia — ventricular tachycardia, torsades de pointes, or supraventricular tachycardia degenerating to VF. This combination requires continuous cardiac monitoring and electrophysiology evaluation.

→ Loss Of Consciousness Overview → Palpitations Overview

Possible Causes of Loss Of Consciousness and Palpitations

Conditions that commonly cause both symptoms together

1Ventricular tachycardia (VT) degenerating to VF
2Torsades de pointes (long-QT syndrome, drug-induced)
3Wolff-Parkinson-White syndrome with rapid conduction
4Complete atrioventricular block (Stokes-Adams)
5Hypertrophic obstructive cardiomyopathy with arrhythmia

Emergency Red Flags

Seek immediate medical attention if you experience any of these

Palpitations that stop abruptly at the moment of loss of consciousness

Witnessed tonic-clonic movements after syncope (vs. true seizure)

Family history of sudden cardiac death or channelopathy

Baseline ECG showing QTc > 500 ms or Brugada pattern

Syncope during physical exercise

When to See a Doctor

Schedule a medical consultation if you notice these signs

Hospitalize immediately for telemetry monitoring

Implantable loop recorder or Holter monitor if diagnosis unclear

Avoid triggering medications (QT-prolonging drugs)

Cardiology and electrophysiology referral is mandatory

Conditions That Cause Both Loss Of Consciousness and Palpitations

2 conditions are associated with this symptom combination

Ventricular Tachycardia

VT is the most common arrhythmic cause of palpitations + syncope

Long QT Syndrome

Torsades de pointes: palpitations followed by syncope or sudden death

Explore Individual Symptoms

In-depth pages for each symptom in this combination

Loss Of Consciousness — Full Overview Causes Treatment When to See a Doctor Related Questions

Palpitations — Full Overview Causes Treatment When to See a Doctor Related Questions

Experiencing Loss Of Consciousness and Palpitations?

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