Which of the following findings is classically associated with pyloric stenosis?

Which of the following best predicts a severe case of acute pancreatitis?

A 17-year-old woman with bipolar disorder presents to the ED after a suicide attempt. She has vomited twice and is complaining of abdominal pain. Her serum acetaminophen level is 170 mcg/mL. N-acetylcysteine is given. What is the mechanism of action of N-acetylcysteine?

An 89-year-old man with chronic dementia, hypertension, recent stroke, and congestive heart failure is brought to the emergency department from his nursing home because his gastrostomy tube was inadvertently pulled out last night. You learn from the nursing home notes that the gastrostomy tube was placed in another hospital approximately two weeks ago. There is not any other information regarding the tube. The patient appears chronically debilitated and cachectic with normal vital signs. You see a very small open tract over the left upper quadrant of the abdomen without any drainage or bleeding and minimal surrounding skin erythema. What is the most appropriate action at this time?

A 78-year-old nursing home resident presents with abdominal pain and constipation. On examination, the abdomen is tympanic to percussion and distended. An X-ray is obtained and seen above. What is the most appropriate next step in management?

An emergency medicine physician is summoned to take care of patients at the scene of a terrorist attack. The first patient the physician encounters has a blood pressure of 117/58 mm Hg, and his pulse is 60/min. Physical exam is notable for profuse salivation and drooling as well as fasciculations. Which of the following treatments is appropriate for this patient but will lose efficacy if not administered early in the patient’s course?

Which of the following gastrointestinal foreign body ingestions is an indication for urgent endoscopy?

A 52-year-old man presents to the emergency department with one week of abdominal discomfort and vomiting. His past medical history includes bipolar disorder and depression. He was discharged from the hospital one month ago after an admission for acute iron toxicity. Which of the following is the most likely cause of his current symptoms?

A patient on peritoneal dialysis presents with fever and abdominal pain. The patient is nontoxic, and the abdominal examination is remarkable only for the presence of a peritoneal dialysis catheter. Fluid sent from the peritoneal dialysis catheter contains 153 WBC/µL with 64% neutrophils. Which of the following managements should be pursued?