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Difficulty: HardDiagnostic Workup and Test Sequencing

Match each clinical presentation of gastrointestinal bleeding with the most appropriate next step in the diagnostic workup.

  • A 72-year-old man presenting with massive bright red blood per rectum, hypotension (80/50 mmHg), and a bilious nasogastric aspirate, who remains unstable despite aggressive volume resuscitation.Mesenteric angiography
  • A 65-year-old woman with progressive iron deficiency anemia and persistently positive fecal occult blood, who has recently undergone a normal colonoscopy and a normal upper endoscopy.Video capsule endoscopy
  • A 45-year-old man with a history of cirrhosis presenting with acute melena, mild tachycardia, and stable blood pressure.Esophagogastroduodenoscopy (EGD)
  • A 60-year-old man presenting with a single episode of painless hematochezia that has now ceased, accompanied by stable vital signs and a normal baseline hemoglobin level.Colonoscopy

Answer

The unstable lower GI bleed matches with mesenteric angiography. The obscure GI bleed with negative standard scopes matches with video capsule endoscopy. Melena in a patient with cirrhosis matches with EGD. The stable lower GI bleed matches with colonoscopy.
These pairings reflect standard society guidelines for localizing gastrointestinal bleeding, utilizing patient acuity, prior workup, and presentation to determine the most effective imaging or endoscopic modality.

Step-by-Step Solution

1
Determine the patient's hemodynamic status and the suspected anatomic location of bleeding.
Categorize each scenario into upper vs. lower GI source, and stable vs. unstable.
Hemodynamic instability fundamentally alters the diagnostic sequence, pushing the clinician toward modalities that do not require bowel preparation and offer immediate therapeutic capability.
2
Select the appropriate modality for upper GI and small bowel sources.
Assign EGD to the patient with melena (upper source) and video capsule endoscopy to the patient with negative initial EGD/colonoscopy (small bowel source).
EGD is diagnostic and therapeutic for upper GI bleeds. Capsule endoscopy is standard for initial small bowel visualization.
3
Select the appropriate modality for lower GI sources based on stability.
Assign mesenteric angiography to the unstable lower bleed and colonoscopy to the stable lower bleed.
Colonoscopy requires hours of prep and is dangerous in shock. Angiography provides immediate localization and embolization options in severe, active bleeding.

Key Concept

Diagnostic sequencing for gastrointestinal bleeding depends heavily on hemodynamic stability, bleeding characteristics (hematemesis/melena vs. hematochezia), and the results of prior standard endoscopic evaluations.
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Diagnostic Workup and Test Sequencing

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