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Small Bowel Obstruction (Clinical Presentation (Nausea and anorexia,…
Small Bowel Obstruction
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Main Causes
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Adhesions (60%)
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Increased incidence in; pelvic, gynaecology and colorectal surgery
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Pathophysiology
Obstruction of the bowel leads to bowel distension above the block with increased secretion of fluid into the distended bowel
Also leads to proximal dilation, above the block, resulting in:
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Increased pressure with the intramural vessels becoming compressed resulting in ischaemia and/or perforation
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Mechanical obstruction is most common e.g. adhesions, hernia and Crohn's
Untreated, obstruction leads to
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Clinical Presentation
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Less distension as compared to LBO 9since the more distal the obstruction the greater the distension
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Pain - initially colicky (starts and stops abruptly) then diffuse, pain is higher in the abdomen than in LBO
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