Colonscopy for investigation of unexplained rectal bleeding

Area of Science:

• Gastroenterology
• Colorectal Surgery
• Diagnostic Imaging

Background:

• Rectal bleeding is a common symptom indicating potential colonic abnormalities.
• Barium enema examinations are often insufficient for determining the cause of rectal bleeding.
• Colonoscopy offers a direct visualization method for investigating the colon.

Purpose of the Study:

• To evaluate the diagnostic yield of colonoscopy in patients with unexplained rectal bleeding after negative barium enema results.
• To determine the prevalence of various colonic conditions identified by colonoscopy in this patient group.

Main Methods:

• Performed 215 colonoscopic examinations on patients presenting with rectal bleeding.
• Patients had previously undergone barium enema examinations without a definitive diagnosis.

Main Results:

• Colonoscopy diagnosed the probable or definite source of bleeding in 41% of cases.
• Identified conditions included carcinoma (13%), colonic polyps (14%), and inflammatory bowel disease (7%).
• Bleeding sources were more readily found in patients with frank rectal blood loss compared to occult blood.

Conclusions:

• Colonoscopy is a crucial tool for investigating rectal bleeding when initial radiological assessments are negative.
• The study highlights the significance of rectal bleeding as a marker for colonic pathology.
• Colonoscopy demonstrated a high diagnostic value, particularly in patients with multiple negative barium enemas.