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K51.5 Ulcerative Proctitis – Causes & Treatment
K51.5 is the ICD-10 code for ulcerative proctitis, a chronic inflammatory bowel condition limited to the rectum and classified as a subtype of ulcerative colitis.
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K51.5 is the ICD-10 code for ulcerative proctitis, a chronic inflammatory bowel condition limited to the rectum and classified as a subtype of ulcerative colitis.
What is K51.5 (Ulcerative Proctitis)?
K51.5 is the ICD-10 diagnostic code for ulcerative proctitis, a chronic inflammatory condition of the rectal mucosa confined to the rectum. It is a subtype of ulcerative colitis (UC) and belongs to the group of inflammatory bowel diseases (IBD). The condition typically follows a relapsing-remitting course, meaning periods of active inflammation alternate with symptom-free intervals.
Causes
The exact cause of ulcerative proctitis is not fully understood. Current evidence points to a combination of factors:
- Immune dysregulation: The immune system mounts an inappropriate response against the normal gut flora, leading to inflammation of the rectal lining.
- Genetic predisposition: A family history of inflammatory bowel disease increases the risk.
- Environmental factors: Diet, stress, and prior infections may act as triggers or aggravating factors.
- Gut microbiome alterations: Disruption of the normal bacterial composition in the intestine is also being investigated.
Symptoms
Symptoms of ulcerative proctitis are primarily localized to the rectum and anus:
- Frequent urge to defecate with passage of small amounts of stool (tenesmus)
- Blood and mucus in the stool
- Pain, pressure, or discomfort in the rectal and anal area
- Feeling of incomplete bowel evacuation
- Occasional constipation, as the inflammation is restricted to the rectum
Systemic symptoms such as fever or significant weight loss are less common in ulcerative proctitis compared to more extensive forms of ulcerative colitis.
Diagnosis
Diagnosis is based on a combination of clinical evaluation and diagnostic procedures:
- Medical history and physical examination: Assessment of symptoms, bowel habits, and family history.
- Endoscopy (rectoscopy or colonoscopy): Direct visualization of the rectal mucosa reveals typical findings such as redness, edema, friability, and ulcerations.
- Biopsy: Tissue samples from the rectum are examined histologically to confirm the diagnosis and rule out other conditions.
- Stool tests: To exclude infectious causes such as bacteria or parasites.
- Laboratory tests: Inflammatory markers (CRP, ESR) and a complete blood count are assessed.
Treatment
Treatment of ulcerative proctitis is tailored to disease severity and aims to induce and maintain remission:
Topical (Local) Therapy
- 5-Aminosalicylates (5-ASA, mesalazine): The first-line treatment, preferably administered as rectal foam or suppositories directly to the affected area. These agents have anti-inflammatory properties.
- Topical corticosteroids: Used when there is insufficient response to 5-ASA therapy.
Systemic Therapy
- In cases of severe disease or failure to respond to topical therapy, systemic corticosteroids, immunosuppressants (e.g., azathioprine), or biologics (e.g., TNF-alpha inhibitors such as infliximab) may be required.
General Measures
- Stress management and psychological support
- Dietary adjustments during active flares
- Regular follow-up with a gastroenterologist
Prognosis and Long-term Outlook
Ulcerative proctitis tends to follow a chronic relapsing course. In some patients, the inflammation may extend to other parts of the colon over time. With consistent medical therapy, long-term remission is achievable in the majority of patients. While the risk of colorectal cancer is lower than in extensive ulcerative colitis, regular endoscopic surveillance remains important.
References
- Harbord M. et al. – Third European Evidence-based Consensus on Diagnosis and Management of Ulcerative Colitis. Journal of Crohn's and Colitis, 2017; 11(6): 649–670.
- Kornbluth A., Sachar D.B. – Ulcerative Colitis Practice Guidelines in Adults: American College of Gastroenterology, Practice Parameters Committee. American Journal of Gastroenterology, 2010; 105(3): 501–523.
- World Gastroenterology Organisation (WGO) – Global Guidelines: Inflammatory Bowel Disease (IBD), 2015. Available at: www.worldgastroenterology.org
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