Category: Medicine

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…

Definition It is defined as the disorder of rate, rhythm and conduction of cardiac impulse. Types 1. Impulse arising from SA node (Sinus arrhythmia)— –– Sinus arrhythmia. –– Sinus tachycardia.…

Definition It is a multisystem disorder that occurs as a sequele to pharyngitis by group A beta-haemolytic streptococcus. Mechanism It is due to autoimmune reaction due to molecular mimicry between…

Definition It is an arrhythmia in which heart rate increases in inspiration and decreases in expiration. It is a benign condition, common in children and young adults. Sometimes, in healthy…

Types of Congenital Heart Diseases: Cyanotic • Tetralogy of Fallot. • Transposition of great vessels. • Truncus arteriosus. • Pulmonary atresia. • Tricuspid atresia. • Ebstein’s anomaly. Acyanotic • Left…