Stool studies for enteric pathogens may identify a precipitant of toxic megacolon but require a minimum of 24 hours before test results are received.
A 32-year-old woman is evaluated for a painful rash occurring bilaterally on her lower extremities, which began 2 days ago. She was admitted to the hospital 5 days ago for diagnosis and treatment of pulmonary embolism with heparin and warfarin. Her
A 24-year-old woman is evaluated for a 1-month history of increasing pain and bleeding from a skin ulcer next to her stoma. The skin symptoms get worse each time she changes her appliance. She underwent proctocolectomy 4 years ago for medically
A 66-year-old man is evaluated in the emergency department following a fall 3 days ago, when he struck the right side of his chest against a table. Since that time he has experienced right-sided pleuritic chest pain and difficulty taking a deep
A 42-year-old man comes to the office to discuss results of imaging studies, which were ordered because of a change in his pattern of chronic migraine. Headache episodes have now improved. Following a physical exam and noncontrast CT scan, what is
A 72-year-old man is evaluated for a 1-year history of progressively impaired gait and balance. He reports that he walks more slowly and is not as agile as he used to be, attributing a recently increased number of falls to not paying enough
Pseudothrombocytopenia is a laboratory artifact in which platelets drawn into an ethylenediaminetetraacetic acid (EDTA)-anticoagulated test tube clump and fail to be counted accurately by the automated counter, resulting in a
A 44-year-old man is evaluated for a new lesion on the side of his face. It has been present for several months and is asymptomatic. When he shaves he cuts it, and it starts bleeding. Following a physical exam, what is the most likely diagnosis?
A 37-year-old woman is evaluated in the emergency department for the acute onset of pain after 2 weeks of bloody diarrhea. The diarrhea has escalated to 15 times per day. She has ulcerative colitis that was diagnosed 2 years ago. She currently takes
Low-risk patients without evidence of myocardial infarction can be evaluated with an exercise or pharmacologic stress test. ... However, a stress test in a patient with probable acute coronary syndrome could provoke an extension of her myocardial