Ventricular Arrhythmias
Ventricular arrhythmias, or abnormal heart rhythms originating from the ventricles, can cause death. The most dangerous of these are ventricular tachycardia (VT) and ventricular fibrillation (VF). These conditions can lead to cardiac arrest, or the sudden and abrupt loss of heart function. Cardiac arrest can cause death, but may also be reversible with prompt medical attention.
Supraventricular Arrhythmias
Supraventricular arrhythmias, or abnormal heart rhythms originating from the atria, can also lead to death. Atrial fibrillation (AF) is the most common form of supraventricular arrhythmia, and can cause complications like stroke. Atrial flutter (AFL) is another common supraventricular arrhythmia, and can also lead to stroke. In rare cases, a person with supraventricular arrhythmia can experience a rapid heartbeat known as ventricular tachycardia or ventricular fibrillation, which can lead to cardiac arrest and death.
Bradyarrhythmias
Bradyarrhythmias, or slow heart rhythms, can also cause death. If the heart rate is too slow, the body may not get enough oxygenated blood, and a person can experience symptoms such as dizziness, fainting, and chest pain. These symptoms can be life-threatening and can lead to cardiac arrest and death.
Long QT Syndrome
Long QT syndrome (LQTS) is a rare genetic disorder that can cause sudden death. LQTS is caused by abnormal electrical activity in the heart that can cause the heart to beat too fast or too slow. If the heart rate is too slow, it can lead to cardiac arrest and death.