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Definition of Ventricular Tachycardia Ventricular tachycardia (VT) is defined as three or more consectutive ectopic beats, heart rate usually 140–220 beats/minute with regular rhythm. Causes of Ventricular Tachycardia • Acute…
Definition of Ventricular fibrillation Ventricular fibrillation (VF) is a type of ventricular arrhythmia characterised by rapid, irregular, ineffective and uncoordinated ventricular activation with no mechanical effect. There is chaotic electrical…
What is Cardiac Arrest It is defined as sudden loss of cardiac function, when the heart abruptly stops beating. Causes of Cardiac Arrest 1. Ventricular fibrillation (commonest cause). 2. Ventricular…
What is Atrial fibrillation? Atrial fibrillation (AF) is an arrhythmia where atria beat rapidly, chaotically and ineffectively, while the ventricles respond at irregular intervals, producing the characteristic irregularly irregular pulse.…
Definition It is the dysfunction of SA node characterised by attacks of sinus bradycardia, sinus arrest or junctional rhythm which may lead to dizziness or syncope, followed by episodes of…
Definition It is a syndrome in which there is an accessory pathway that bypasses the AV node and connects the atrium and ventricle (by bundles of Kent). May be associated…
Supraventricular Tachycardia (SVT) Definition It is a type of tachycardia that occurs due to re-entry or rapidly firing ectopic focus in atria or AV node. Causes 1. Physiological Causes Anxiety,…
Definition When the heart rate is greater than 100/min in sinus ( rhythm. Causes 1. Physiological—anxiety, emotion, exercise, pain, pregnancy. 2. Pathological— –– Anaemia. –– Fever. –– Thyrotoxicosis. –– Shock…
Definition When heart rate is less than 60/min in sinus rhythm. Causes of Sinus Bradycardia 1. Physiological (due to increased vagal tone)— –– Athlete. –– Sleep. –– Occasionally, healthy elderly.…
Definition When the impulse originate from AV node, it is called nodal or junctional rhythm. If the rate is high, it is called junctional tachycardia. Usually, it occurs due to…