A 22-year-old man presents with bloating, crampy abdominal pain, and watery diarrhea 30 minutes after consuming ice cream. He reports identical symptoms with milk but tolerates meat and fruit without difficulty. Vital signs are normal (BP 118/76, HR 78, RR 14, Temp 37°C). Physical examination is unremarkable. Serum glucose is 95 mg/dL. Which enzyme deficiency best explains his symptoms?
- A)Maltase in saliva
- B)Sucrase in hepatocytes
- C)Lactase on the intestinal brush borderGABARITO
- D)Pancreatic amylase in the intestinal lumen
- E)Trehalase in the stomach
Explicação
Primary lactase deficiency causes osmotic diarrhea, bloating, and crampy pain after dairy ingestion. Lactase is a brush border disaccharidase in the small intestine that hydrolyzes lactose into glucose and galactose. Normal exam and selective symptoms with dai... Ver explicação completa e trilha adaptativa →