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abdominal radiograph bowel obstruction interpretation dilated small bowel loops guidelines

What would you like help with regarding this abdominal X-ray: a plain-language explanation, possible findings, or guidance on urgency?
I can comment generally, but a photographed X-ray cannot replace the official radiology report. If there is severe or worsening abdominal pain, repeated vomiting, a swollen abdomen, fever, or inability to pass stool or gas, seek urgent medical assessment.

Inteprate

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"small bowel obstruction" AND radiography

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ACR Appropriateness Criteria suspected small bowel obstruction abdominal radiograph CT

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https://acsearch.acr.org/list/GetAppendix?TopicId=134&PanelN…

Preliminary interpretation only, not a formal radiology report:
  • Single supine AP abdominal radiograph.
  • There are several mildly dilated central small-bowel loops, particularly in the left/central abdomen, with visible valvulae conniventes.
  • Gas and stool are still present in the colon, so this does not look like a clear complete, high-grade obstruction on this one view.
  • Pattern is concerning for focal small-bowel ileus or a partial/early small-bowel obstruction. The exact cause and severity cannot be determined from this photographed supine film.
  • No obvious large radiopaque urinary stone is seen.
  • No obvious free intraperitoneal gas is visible, but a supine abdominal X-ray is not reliable for excluding perforation.
Impression: Mild small-bowel dilatation, suspicious for partial small-bowel obstruction versus ileus. Correlate urgently with symptoms, examination, prior abdominal surgery or hernia, and labs. If there is significant pain, vomiting, distension, constipation/no flatus, fever, tachycardia, or abdominal tenderness, this needs same-day emergency/clinical review and usually CT abdomen-pelvis with IV contrast to look for a transition point, cause, and complications. CT is the preferred test when obstruction is suspected, as reflected in the ACR imaging criteria.
On a plain radiograph, dilated small bowel greater than about 3 cm plus air-fluid levels and little colonic gas supports obstruction, but plain films can miss or mimic obstruction. Schwartz's Principles of Surgery, p. 3491.

Ileus sign bloods

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"postoperative ileus" AND management

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Merck Manual ileus diagnosis laboratory tests electrolyte abnormalities

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Ileus: clinical signs

  • Abdominal distension/bloating
  • Nausea and vomiting
  • Constipation or no passage of flatus, though small amounts of watery stool may still occur
  • Diffuse, vague abdominal discomfort rather than severe intermittent colicky pain
  • Reduced or absent bowel sounds ("silent abdomen")
  • Abdomen is often soft and not markedly tender unless there is an underlying inflammatory cause
On X-ray, ileus typically causes diffuse gas dilatation of both small and large bowel, often with gas continuing into the rectum, without a clear transition point. A mechanical small-bowel obstruction more often has disproportionately dilated small bowel and relatively little colonic/rectal gas. CT is needed if the distinction is uncertain. Sabiston Textbook of Surgery, p. 1953.

Blood tests to request

These tests do not diagnose ileus by themselves. They identify dehydration, electrolyte causes, infection, and complications:
  1. Full blood count (FBC/CBC)
    • Raised WBC/neutrophils may suggest infection, inflammation, bowel ischemia, or sepsis.
    • Raised hematocrit can suggest dehydration.
  2. Urea, creatinine, electrolytes
    • Sodium, potassium, chloride, bicarbonate, urea and creatinine.
    • Look especially for low potassium, low magnesium, low sodium, and renal impairment/dehydration. Hypokalemia is a recognized trigger for ileus.
  3. Magnesium, calcium, phosphate
    • Low magnesium and abnormal calcium can worsen gut dysmotility. High calcium can also cause ileus.
  4. CRP
    • Helps assess for inflammation or an intra-abdominal infection.
  5. Venous blood gas or arterial blood gas with lactate
    • Lactate elevation, acidosis, or worsening base deficit raises concern for hypoperfusion, ischemia, or sepsis rather than simple uncomplicated ileus.
  6. Liver function tests and lipase
    • Consider when biliary disease, hepatitis, or pancreatitis might be contributing.
  7. Glucose
    • Especially in diabetes or suspected metabolic illness.
  8. Urinalysis, and cultures if febrile
    • Urine infection, chest infection, and sepsis can precipitate or prolong ileus. Blood cultures are appropriate if fever, rigors, hypotension, or suspected sepsis.
Common causes include recent abdominal surgery, opioids/anticholinergic drugs, sepsis, intra-abdominal inflammation, and electrolyte disturbances such as hypokalemia, hyponatremia, and hypomagnesemia. Tintinalli’s Emergency Medicine, p. 600; Sabiston Textbook of Surgery, p. 1953.
Urgent review is needed for severe or increasing pain, focal tenderness/guarding, fever, tachycardia, persistent vomiting, leukocytosis, rising lactate, acidosis, or a worsening abdomen. These features may indicate mechanical obstruction, ischemia, perforation, or sepsis rather than simple ileus.
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