Cardiac Arrhythmia

Dr. Hussam Al-Humadi
1
Cardiac Arrhythmia
Tachyarrhythmias
Cardiac rhythms whose ventricular rate exceeds 100 bpm.
1. Narrow-Complex Tachyarrhythmia (QRS <120 ms)
2. Wide-Complex Tachyarrhythmia (QRS >120 ms)
Etiology
? Disorders of Impulse Conduction (e.g., VT).
? Disorders of Impulse Formation: Enhanced automaticity (e.g., accelerated junctional
and accelerated idioventricular rhythm) and triggered activity (e.g., long QT
syndrome and digitalis toxicity)
? Other less common mechanisms of tachyarrhythmias.
Clinical features
? Dyspnea, angina, lightheadedness or syncope and decreased level of consciousness
? Palpitations:
? Sudden onset and termDr. Hussam Al-Humadi
1
Cardiac Arrhythmia
Tachyarrhythmias
Cardiac rhythms whose ventricular rate exceeds 100 bpm.
1. Narrow-Complex Tachyarrhythmia (QRS <120 ms)
2. Wide-Complex Tachyarrhythmia (QRS >120 ms)
Etiology
? Disorders of Impulse Conduction (e.g., VT).
? Disorders of Impulse Formation: Enhanced automaticity (e.g., accelerated junctional
and accelerated idioventricular rhythm) and triggered activity (e.g., long QT
syndrome and digitalis toxicity)
? Other less common mechanisms of tachyarrhythmias.
Clinical features
? Dyspnea, angina, lightheadedness or syncope and decreased level of consciousness
? Palpitations:
? Sudden onset and term