USMLE Step 2 Rapid Review CK - Gastrointestinal Exam Solved 100%

Patient presents with sudden onset of severe, diffuse abdominal pain. Exam reveals peritoneal signs and abdominal radiograph reveals free air under the diaphragm. Management? - Answer Emergent laparotomy to repair a perforated viscus. The most likely cause of acute lower GI bleeding in patients >40 - Answer Diverticulosis Diagnostic modality used when ultrasonography is equivocal for cholecystitis - Answer Hepatobiliary iminodiacetic acid (HIDA) scan Risk factors for cholelithiasis - Answer Fat Female Forty Fertile Flatulent Inspiratory arrest during palpation of the RUQ - Answer Murphy's sign, seen in acute cholecystitis Most common cause of small bowel obstruction (SBO) in patients with no history of abdominal surgery - Answer Hernia Most common cause of SBO in patients with a history of abdominal surgery - Answer Adhesions Most common bacterial organism causing diarrhea - Answer Campylobacter Key organism causing diarrhea: recent antibiotic use - Answer Clostridium difficile Key organism causing diarrhea: camping - Answer Giardia lamblia Key organism causing diarrhea: traveler's diarrhea - Answer Enterotoxigenic E. coli (ETEC) Key organism causing diarrhea: church picnics/mayonnaise - Answer Staphylococcus aureus Key organism causing diarrhea: uncooked hamburgers - Answer Enterohemorrhagic E. coli (EHEC) O157:H7 Key organism causing diarrhea: fried rice - Answer Bacillus cereus Key organism causing diarrhea: poultry/eggs - Answer Salmonella Key organism causing diarrhea: raw seafood - Answer Vibrio HAV Key organism causing diarrhea: AIDS - Answer Cryptosporidium Isospora Mycobacterium avium complex Key organism causing diarrhea: pseudoappendicitis - Answer Yersinia enterocolytica Campylobacter