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Zorluk: Çok zorGastrointestinal and Abdominal Surgery

Surgical consultation is requested for a 62-year-old man due to a change in his clinical status. The patient was admitted three days ago with a mechanical small bowel obstruction attributed to adhesions from a remote appendectomy. Initial computed tomography of the abdomen demonstrated a discrete transition point in the distal ileum with collapsed large bowel, lacking any signs of ischemia. He has been managed nonoperatively with intravenous fluid resuscitation, bowel rest, and nasogastric decompression.

Over the last 12 hours, the patient reports that his abdominal pain has transitioned from intermittent cramping to a severe, continuous ache localized to the periumbilical area. Concurrently, his nasogastric tube output has diminished abruptly from 800 mL to 150 mL daily, and he remains obstipated.

Temperature is 38.2°C (100.8°F), heart rate is 110/min, blood pressure is 135/85 mm Hg, and respiratory rate is 18/min. Abdominal examination reveals significant distension with localized periumbilical tenderness and involuntary guarding. Bowel sounds are absent.

Laboratory evaluation shows:
Leukocyte count: 14,500/mm³
Sodium: 140 mEq/L
Potassium: 4.1 mEq/L
Chloride: 104 mEq/L
Bicarbonate: 18 mEq/L
Blood urea nitrogen: 28 mg/dL
Creatinine: 1.3 mg/dL
Venous lactate: 1.9 mmol/L (Normal: 0.5–2.2 mmol/L)

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

  1. A
    Administration of water-soluble oral contrast medium
  2. B
    Continuation of nasogastric decompression and intravenous fluids
  3. Immediate exploratory laparotomyCevap
  4. D
    Mesenteric angiography
  5. E
    Repeat computed tomography of the abdomen and pelvis

Cevap

Immediate exploratory laparotomy
Immediate exploratory laparotomy is the correct next step. This patient initially presented with an uncomplicated small bowel obstruction (SBO) and was appropriately managed conservatively. However, he has now developed cardinal signs of bowel strangulation: a change in the character of pain from intermittent and crampy to continuous and severe, along with fever, tachycardia, leukocytosis, and localized peritonitis (involuntary guarding). Additionally, the sudden decrease in nasogastric tube output in the setting of worsening pain often indicates the formation of a closed-loop obstruction rather than clinical resolution. Although his venous lactate is normal, it is a late and insensitive marker for early bowel ischemia. The presence of these clinical signs mandates immediate surgical exploration to decompress the bowel and resect any necrotic segments, without delaying for further imaging.

Adım Adım Çözüm

1
Identify the patient's underlying diagnosis and initial management.
The patient has a known adhesive mechanical small bowel obstruction (SBO) that was initially uncomplicated and managed conservatively.
Establishing the baseline status allows for the recognition of clinical deviations.
2
Analyze the new clinical findings over the last 12 hours.
The patient's pain changed from crampy to continuous, and he developed a low-grade fever, tachycardia, leukocytosis, an elevated anion gap metabolic acidosis, and localized peritonitis (guarding).
These findings represent the classic clinical triad/tetrad of bowel strangulation (ischemia).
3
Interpret the laboratory and objective data in the context of the clinical picture.
The sudden decrease in NG output suggests a closed-loop obstruction rather than resolution, given the worsening pain. The normal venous lactate does not rule out ischemia.
Lactate is a late and insensitive marker for early bowel ischemia; reliance on it can lead to fatal delays in care.
4
Determine the definitive next step in management.
Immediate exploratory laparotomy is required.
Clinical signs of strangulation in the setting of an SBO are an absolute indication for immediate surgery without further imaging.

Anahtar Kavram

Clinical signs of strangulated small bowel obstruction (change from crampy to continuous pain, fever, tachycardia, leukocytosis, and localized peritonitis) mandate immediate exploratory laparotomy, even if serum lactate is normal.
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Gastrointestinal and Abdominal Surgery

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