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Likelihood Ratio (LR) in Emergency Medicine


Plain X ray in suspected bowel obstruction. Is that all?

Clinical Scenario

A 67 y/o woman arrives in the ED at 5pm because of diffused abdominal pain since 2 hours. She has nausea and she refers costipation from the day before. 
She has a history of hysterectomy 5 years before because of fibroma.
Vital signs are normal, she presents pale and sufferer for pain, the abdomen is distendend and palpation cause pain all over it. 
Bowel movements are present but abnormal. 
Plain x ray shows 2 little fluid levels without the evidence of dilated loops of bowel, so radiologist describe it as negative.

Has plain x ray changed your previous clinical judgment about the suspect of bowel obstruction?