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Red cell abnormalities associated with sulphasalazine maintenance therapy for ulcerative colitis.
Gut
|March 1, 1975
Summary
Sulphasalazine maintenance therapy for ulcerative colitis can cause red blood cell abnormalities. A lower dose of 1.5g daily may be a safer alternative to prevent these drug-induced changes.
Area of Science:
- Hematology
- Pharmacology
- Gastroenterology
Background:
- Ulcerative colitis (UC) is a chronic inflammatory bowel disease.
- Sulfasalazine is a commonly used maintenance therapy for UC.
- Potential adverse effects of sulfasalazine on red blood cells are not fully understood.
Purpose of the Study:
- To investigate the prevalence of drug-induced red blood cell abnormalities in patients with ulcerative colitis on maintenance sulfasalazine therapy.
- To identify factors associated with these red blood cell abnormalities.
- To determine a potentially safer maintenance dose of sulfasalazine.
Main Methods:
- Observational study involving 52 patients receiving sulfasalazine maintenance therapy for UC.
- Comparison with 50 healthy controls and 10 UC patients not on sulfasalazine.
- Assessment of red blood cell parameters, including contracted red cells, macrocytosis, methaemoglobin levels, and Heinz bodies.
- Correlation analysis with sulfasalazine dosage, serum sulphapyridine levels, and acetylator status.
Main Results:
- 35 out of 52 (67%) patients on sulfasalazine exhibited red cell abnormalities.
- Red cell contraction, associated with mild hemolysis, was observed in 23 patients and correlated with sulfasalazine dose, serum sulphapyridine levels, and acetylator status.
- Other abnormalities included macrocytosis (11 patients), elevated methaemoglobin (21 patients), and Heinz bodies (1 patient).
- A sulfasalazine dose of 1.5g/day was not associated with red cell contraction.
Conclusions:
- Sulfasalazine maintenance therapy at a mean dose of 2.5g/day is frequently associated with drug-induced red cell abnormalities in ulcerative colitis patients.
- Red cell contraction is dose-dependent and linked to serum sulphapyridine levels and acetylator status.
- A reduced maintenance dose of 1.5g/day of sulfasalazine is suggested as a safer option for asymptomatic ulcerative colitis patients to mitigate red blood cell toxicity.
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