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Zorluk: ZorSurgical and Procedural Interventions

A 7373-year-old woman is brought to the emergency department by her daughter after suddenly developing agonizing abdominal pain 44 hours ago. The patient has a history of ischemic cardiomyopathy, atrial fibrillation, and hypertension. She was prescribed warfarin but stopped taking it two weeks ago due to financial difficulties.

Vital signs are temperature 38.3∘C38.3^\circ\text{C} (100.9∘F100.9^\circ\text{F}), blood pressure 82/50 mm Hg82/50\text{ mm Hg}, pulse 135/min135/\text{min} and irregularly irregular, and respirations 26/min26/\text{min}. Physical examination reveals a distended abdomen with diffuse, severe tenderness, involuntary guarding, and rebound tenderness. Bowel sounds are absent.

Laboratory studies show 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}. Computed tomography angiography (CTA) of the abdomen reveals a complete occlusion of the proximal superior mesenteric artery. Air is visible within the bowel wall (pneumatosis intestinalis) and in the portal venous system.

Intravenous fluid resuscitation, broad-spectrum antibiotics, and an unfractionated heparin infusion are immediately initiated.

Which of the following is the most appropriate next step in the surgical management of this patient?

  1. Emergent exploratory laparotomyCevap
  2. B
    Percutaneous endovascular mechanical thrombectomy
  3. C
    Catheter-directed intra-arterial thrombolysis
  4. D
    Diagnostic laparoscopy
  5. E
    Repeat computed tomography angiography in 66 hours

Cevap

The correct answer is emergent exploratory laparotomy.
The correct intervention is emergent exploratory laparotomy. This patient presents with advanced acute mesenteric ischemia complicated by irreversible bowel infarction, as evidenced by frank peritonitis, profound lactic acidosis, and pneumatosis intestinalis. In this scenario, the immediate surgical priority is two-fold: restoring blood flow and resecting all necrotic bowel to achieve source control. Only an open exploratory laparotomy provides the adequate exposure necessary to thoroughly run the entire length of the bowel, accurately delineate viable from non-viable segments, perform the necessary resections, and execute open surgical revascularization (e.g., embolectomy).

Adım Adım Çözüm

1
Identify the primary diagnosis from the clinical presentation and imaging.
The patient has acute mesenteric ischemia due to an embolic superior mesenteric artery occlusion, heavily supported by her history of untreated atrial fibrillation.
Sudden-onset severe pain out of proportion to early exam findings, combined with CTA results, confirms the diagnosis.
2
Evaluate for the presence of irreversible bowel injury, infarction, or necrosis.
Bowel infarction has already occurred, indicated by overt peritonitis (guarding, rebound), severe lactic acidosis (8.1 mmol/L8.1\text{ mmol/L}), and pneumatosis intestinalis on CTA.
Recognizing tissue necrosis is the critical branch point in managing mesenteric ischemia, as it changes the required intervention.
3
Determine the most appropriate procedural intervention based on bowel viability.
Emergent exploratory laparotomy is required over minimally invasive techniques.
When necrotic bowel is present, open surgical exploration is mandatory to physically resect the non-viable segments and restore perfusion to the remaining healthy bowel. Endovascular approaches cannot address the dead tissue.

Anahtar Kavram

In patients with acute mesenteric ischemia, the presence of peritonitis, hemodynamic instability, or radiographic signs of bowel infarction (such as pneumatosis intestinalis) constitutes an absolute indication for emergent exploratory laparotomy rather than endovascular intervention.
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Surgical and Procedural Interventions

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