Examkin

Question

Difficulty: MediumGastrointestinal and Abdominal Surgery

For the following patients presenting with acute abdominal symptoms, identify the most appropriate next diagnostic or therapeutic step in their management.

  • A 68-year-old man with a history of atrial fibrillation presents with sudden-onset, severe periumbilical pain. Physical examination reveals a soft, non-tender abdomen without guarding or rebound.CT angiography of the abdomen and pelvis
  • A 74-year-old man with a smoking history presents with abrupt onset of severe left flank pain and dizziness. Vital signs show a blood pressure of 78/40 mmHg. Examination reveals a tender, pulsatile supraumbilical mass.Emergent exploratory laparotomy
  • A 52-year-old woman with a 3-day history of left lower quadrant pain and fever has a CT scan of the abdomen showing sigmoid wall thickening and an adjacent 6.5-cm fluid collection.CT-guided percutaneous drainage
  • A 28-year-old man with known ulcerative colitis presents with a new-onset high fever, significant abdominal distension, and lethargy. Vital signs show marked tachycardia and hypotension.Plain abdominal radiography

Answer

The correct pairings appropriately triage acute abdominal conditions based on hemodynamic stability and specific pathology: Acute mesenteric ischemia requires CT angiography; an unstable ruptured AAA requires emergent laparotomy; a large diverticular abscess requires percutaneous drainage; and suspected toxic megacolon requires plain abdominal radiography to confirm colonic dilation.
Each clinical scenario requires a specific, targeted approach dictated by the underlying pathophysiology and the patient's hemodynamic status. Acute mesenteric ischemia needs CT angiography to visualize emboli; an unstable ruptured AAA requires immediate laparotomy to prevent exsanguination; large diverticular abscesses are treated with minimally invasive percutaneous drainage; and suspected toxic megacolon is initially evaluated with plain X-rays to assess colonic diameter non-invasively.

Step-by-Step Solution

1
Analyze the first patient's presentation of pain out of proportion to exam with a history of atrial fibrillation.
Recognize this as acute mesenteric ischemia, which requires vascular imaging.
Early detection of arterial occlusion is critical to prevent bowel necrosis, making CT angiography the best next step.
2
Identify the second patient's triad of flank pain, pulsatile mass, and shock.
Diagnose a ruptured AAA. Recognize that hemodynamic instability dictates immediate surgical intervention.
Delaying surgery for a CT scan in an actively bleeding, unstable patient with a known or highly suspected ruptured AAA is often fatal.
3
Evaluate the third patient's CT findings of a 6.5-cm diverticular abscess.
Select percutaneous drainage as the appropriate intervention.
Guidelines indicate that abscesses larger than 3-4 cm typically require percutaneous drainage rather than antibiotics alone, potentially avoiding an emergent multi-stage operation.
4
Assess the fourth patient's toxic presentation with inflammatory bowel disease.
Select plain radiography to safely confirm toxic megacolon.
Plain films will quickly show colonic dilation and thumbprinting without risking the high chance of perforation associated with colonoscopy or barium enema.

Key Concept

Appropriate selection of surgical versus diagnostic interventions in acute abdominal emergencies based on hemodynamic stability, risk of perforation, and specific pathophysiologic mechanisms.

Alternative Method

In centers with immediate availability, a bedside FAST (Focused Assessment with Sonography for Trauma) exam could rapidly confirm the presence of free intraperitoneal fluid or an abdominal aortic aneurysm in the unstable patient, but obtaining it should never delay the transfer of an unstable patient to the operating room.
Estimated Time:2m 0s
Rate this question

Topics

Gastrointestinal and Abdominal Surgery

More questions from this topic