<prompt> Constituents of Tetralogy of fallot TOF are all EXCEPTAortic stenosisPulmonary stenosisOverriding of aortaVSD  <response>: i.e. Aortic stenosis: 408-Ghai 7thTETRALOGY OF FALLOTi Ventricular septal defectii Pulmonary stenosisiii Overriding or dextroposed aortaiv Right ventricular hypertrophyPENTALOGY OF FALLOTi Ventricular septal defectii Pulmonary stenosisiii Overriding or dextroposed aortaiv Right ventricular hypertrophyv ASD or patent foramen ovaleThe basic embryological defect leading to TOF is Anterior deviation of the infundibular septum Hall mark of Tetralogy Commonest symptoms of TOF - dyspnea on exertion and exercise intolerance ECG - Right axis deviation with right ventricular hypertrophy monophasic R wave in VI with an abrupt change to an rS pattern is classical inverted T.waves in right precordial leads P pulmonale can be present. 