This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Right axis deviation is seen in all except –a)  VSDb)  Tricuspid atresiac) Pulmonary atresiad)  ASD \nSelect and explain. \nA. a, B. c, C. bc, D. ad', 'role': 'user'}, {'content': "Answer: C \nExplanation: Normally, the QRS axis ranges from -30° to + 100°.\nAn axis more negative than -30° is referred to as left axis deviation.\nAn axis more positive than + 100° is referred to as right axis deviation.\n\nCauses of left axis deviation (LAD)\n\nLeft ventricular hypertrophy\nLeft anterior fascicular block or hemiblock.\nInferior wall MI.\n\nCauses of Right axis deviation (RAD)\n\nRight ventricle overload (right ventricular hypertrophy\nLeft posterior fascicular block.\nLateral wall MI\nDextrocardia\nLeft pneumothorax\nNow see the explanations of the previous question and you can easily solve this question.\n\n\n\nLeft ventricular hypertrophy causes LAD, and CHDs causing LVH are : -\n\n1) VSD\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 iii) Endocardial cushion ASD\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 v) Truncus arteriosus \xa0 \xa0 \xa0 \xa0 \xa0\nii) PDA\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 iv) COA (in older children)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 vi) Tricuspid atresia\nvii) Pulmonary atresia\n\nRight ventricular hypertrophy causes RAD, and CHD's causing RVH are : -\n\n\nTGA \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nTAPVR\xa0\xa0\xa0\nTOF\nASD\xa0 \xa0\xa0\xa0\nEisenmenger's syndrome\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nCOA (in infants)\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\n\nAbout option 'a'\n\nAll patients with VSD are born with right ventricular hypertrophy, as the pulmonary vascular resistance decreases, RVH regresses and there is LVH. Hemodynamics of VSD will be explained in the respective question.\nSo, at birth VSD may show right axis deviation.", 'role': 'assistant'}]