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Zorluk: OrtaSurgical and Procedural Interventions

An ambulance brings a 68-year-old man to the acute care bay following the abrupt onset of excruciating, diffuse abdominal pain that began 4 hours prior. He has a known medical history of paroxysmal atrial fibrillation and hypertension but recently discontinued his prescribed oral anticoagulation due to financial constraints. On arrival, his vital signs demonstrate a temperature of 38.8∘C38.8^\circ\text{C} (101.8∘F101.8^\circ\text{F}), a heart rate of 130/min130/\text{min} with an irregularly irregular rhythm, a blood pressure of 82/48 mmHg82/48\text{ mmHg}, and a respiratory rate of 24/min24/\text{min}. Physical examination reveals a rigid, markedly distended abdomen with severe diffuse tenderness, absent bowel sounds, and pronounced involuntary guarding. Point-of-care laboratory testing reveals a leukocyte count of 22,000/mm322,000/\text{mm}^3 and a serum lactate level of 8.1 mmol/L8.1\text{ mmol/L}. After initiating aggressive intravenous fluid resuscitation and broad-spectrum antibiotics, which of the following is the most appropriate next step in the management of this patient?

  1. A
    Computed tomography angiography of the abdomen and pelvis
  2. B
    Catheter-directed intra-arterial thrombolysis
  3. Immediate exploratory laparotomyCevap
  4. D
    Upright and supine abdominal plain film radiography
  5. E
    Intravenous administration of therapeutic unfractionated heparin and observation

Cevap

Immediate exploratory laparotomy
The correct sequence of management for acute mesenteric ischemia depends critically on the presence or absence of peritonitis. This patient's classic presentation (atrial fibrillation off anticoagulants, sudden severe abdominal pain) has rapidly progressed to a rigid abdomen, severe lactic acidosis, and hypotensive shock. These clinical markers indicate that the ischemic bowel has undergone transmural infarction and is either necrotic or perforated. In this scenario, the standard of care is immediate exploratory laparotomy to resect the dead bowel and restore source control. Any attempt to obtain advanced imaging or perform endovascular procedures will only delay life-saving surgery.

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1
Analyze the patient's risk factors and history.
The patient has atrial fibrillation and is not taking anticoagulation, placing him at high risk for a thromboembolic event.
Identifying the underlying pathophysiology (arterial embolus) establishes the likelihood of acute mesenteric ischemia.
2
Evaluate the current physical examination and vital signs.
The patient exhibits a rigid abdomen, involuntary guarding, hypotension (82/48 mmHg82/48\text{ mmHg}), and severe lactic acidosis (8.1 mmol/L8.1\text{ mmol/L}).
These findings distinguish early ischemia (pain out of proportion to exam) from late-stage transmural infarction (overt peritonitis and shock).
3
Determine the appropriate management pathway based on clinical stability.
The presence of peritonitis and hemodynamic instability dictates that the patient must go directly to the operating room for an immediate exploratory laparotomy.
Advanced imaging or minimally invasive interventions are contraindicated and dangerously delay source control when the bowel is already necrotic or perforated.

Anahtar Kavram

Patients with acute mesenteric ischemia who develop signs of peritonitis or hemodynamic instability require emergent exploratory laparotomy for resection of necrotic bowel, bypassing further diagnostic imaging.
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Surgical and Procedural Interventions

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