Most common biochemical abnormality in congenital pyloric stenosis.: (A) Hyperkalemic metabolic acidosis, (B) Hypokalemic metabolic acidosis, (C) Hyperkalemic metabolic alkalosis, (D) Hypokalemic metabolic alkalosis
Answer is D. Ans. is 'd' i.e. Hypokalemic metabolic alkalosis Repeated vomiting leads to hypochloremic, hypokalemic metabolic alkalosis. The urine is alkaline initially but eventually it becomes acidic (paradoxical aciduria)