Any preventative measures, tests or treatment available to ensure that scar tissue in the abdomen following a burst appendix six years ago will not lead to a bowel obstruction?
I don't know of any prevention. I think the only thing one can do is to be aware of this history when there are any abdominal symptoms. Adhesions do occur and do cause problems in some instances, but should be successfully treated when diagnosed. Diagnosis is easiest if the caregivers are aware of this possibility and use the proper diagnostic tests ("imaging," primarily, I would think).
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