A 26-year-old man presents to the clinic with a 2-day history of frequent, watery stools a… — USMLE Step 2 CK

A 26-year-old man presents to the clinic with a 2-day history of frequent, watery stools and mild, diffuse abdominal cramping. He reports up to six loose bowel movements daily without visible blood or mucus. He has experienced mild nausea but no vomiting. The patient recently attended a catered outdoor gathering with several friends who are now experiencing similar symptoms. His temperature is $37.3^\circ\text{C}$ ( $99.1^\circ\text{F}$ ), blood pressure is $118/76\text{ mmHg}$ , and pulse is $84/\text{min}$ . The abdomen is soft, non-distended, and mildly tender to deep palpation diffusely, with hyperactive bowel sounds and no rebound tenderness or guarding. He is otherwise healthy and takes no daily medications. Which of the following is the most appropriate next step in the management of this patient?

A
Initiation of empiric ciprofloxacin therapy
B
Plain upright abdominal radiography
Recommendation for oral rehydration and supportive careAnswer
D
Stool evaluation for ova and parasites
E
Prescription for oral metronidazole

Answer

Recommendation for oral rehydration and supportive care

The correct answer is the recommendation for oral rehydration and supportive care because this patient's clinical presentation—acute, non-bloody, watery diarrhea without high fever or signs of severe dehydration—is most consistent with a self-limiting viral gastroenteritis or mild bacterial food poisoning. Routine use of antibiotics or extensive diagnostic testing is not indicated for acute uncomplicated diarrhea.

Step-by-Step Solution

Evaluate the patient's symptoms and vital signs to determine the severity of the illness.

The patient has a 2-day history of non-bloody, watery diarrhea with mild cramping, a normal temperature, and stable hemodynamics.

Identifying red flags (e.g., high fever, severe abdominal pain, profound volume depletion, or bloody stools) is crucial to differentiate self-limiting from severe disease.

Consider the epidemiological context of the illness.

The illness started after a catered gathering where others also became sick, suggesting a common-source viral or simple bacterial foodborne outbreak.

Common-source outbreaks of mild watery diarrhea are almost always self-limiting.

Select the appropriate management strategy based on severity and etiology.

Supportive care with oral rehydration is indicated.

Clinical guidelines recommend avoiding empiric antibiotics and diagnostic workups for acute, mild, non-bloody diarrhea lasting less than 7 days.

Key Concept

Uncomplicated acute watery diarrhea is typically a self-limiting viral or bacterial illness that requires only supportive management with oral rehydration, without the need for routine antimicrobial therapy or extensive diagnostic testing.

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