1 Technical errors & artefacts -- 2 Sinus Node Dysfunction -- 3 The P wave & The PR segment -- 4 Narrow QRS Tachycardias -- 5 Atrial flutter -- 6 Atrial fibrillation -- 7 Short PR interval, Ventricular preexcitation -- 8 Atrioventricular accessory path (The Kent bundle) -- 9 Tachyarrhythmias associated with preexcitation -- 10 Atrioventricular Block -- 11 Third degree atrioventricular block (Complete atrioventricular block), Atrioventricular dissociation -- 12 Site and etiology of atrioventricular block -- 13 Stokes-Adams' attacks -- 14 Cardiac Pacing Systems and their normal functioning -- 15 Pacemaker malfunctions -- 16 Ventricular ectopic beats -- 17 Broad QRS Tachycardias -- 18 Ventricular tachyarrhythmias -- 19 The Q Wave -- 20 Subtle ECG changes in early phase of anterior and lateral myocardial infarction -- 21 Inferior or Posterior myocardial infarction -- 22 Mid-late QRS changes suggestive of myocardial necrosis -- 23 Right ventricular infarction -- 24 Left bundle branch block (Delay in left ventricular depolarization delay) -- 25 Left bundle branch block (Delay in left ventricular depolarization) and myocardial necrosis -- 26 Left anterior fascicular block (LAFB) (Delay in left anterosuperior depolarization) (Left anterior hemiblock LAHB) -- 27 Left posteroinferior fascicular block (delay in depolarization of the posteroinferior fascicle) -- 28 RIGHT BUNDLE BRANCH BLOCK (RBBB) (Delay in right ventricular depolarization) -- 29 Multifascicular blocks (delayed conduction in more than one fascicle) -- 30 Other localized intraventricular conduction defects -- 31 Chronic left ventricular volume overload -- 32 Left Ventricular systolic overload (Pressure overload) -- 33 Chronic right ventricular volume overload -- 34 Chronic right ventricular pressure overload(Systolic overload) -- 35 Acute right ventricular pressure overload- Acute pulmonary embolism -- 36 Biventricular enlargement/ hypertrophy/overload -- 37 Hypertrophic cardiomyopathy( HCM) -- 38 Low voltage electrocardiogram -- 39 J Point and the J wave syndrome -- 40 ST-segment elevation -- 41 ST-segment Depression -- 42 T wave - Normal variations and Flat T wave -- 43 Prominent (tall) T waves -- 44 Inverted T waves -- 45 The QT interval -- 46 The U wave -- 47 Electrical Alternans -- 48 Electrocardiogram in asymptomatic, acyanotic congenital heart disease -- 49 Electrocardiogram in a neonate presenting with heart failure -- 50 Utility of electrocardiogram in a cases presenting with heart failure in infancy (after neonatal period) -- 51 Electrocardiogram in children/ adolescents/ adults with cyanosis due to congenital cardiovascular disease.