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Cotrimoxazole prophylaxis prevents major infective episodes in patients with systemic lupus erythematosus on immunosuppressants: A non-concurrent cohort study.

Lupus 2021 May
BACKGROUND: Prophylactic trimethoprim-sulfamethoxazole (TMP-SMX) prevents pneumocystis jirovecii infection in SLE on immunosuppression. Its role in preventing other major infections in immuno suppressed SLE patients is unknown.

METHODS: A non-concurrent cohort study was conducted on patients of SLE fulfilling SLICC and/or ACR 1997 criteria, who received tapering dose of steroid starting with ≥0.5 mg/kg/day of prednisolone or equivalent dose of deflazacort and mycophenolate mofetil ≥1 g/day (or equivalent dose of mycophenolate sodium) at least for the preceding 1 year. Interviewing patients & documenting relevant data from hospital electronic Medical records (EMR), followed by comparison of Incidence densities of major infections between those on prophylactic Trimethoprim 160 mg + Sulfamethoxazole 800 mg and those not on it, was done by student 't' test. Multivariate logistic regression was performed for independent risk of any major infection between the two groups.

RESULTS: Of 228 patients, 162 did not receive TMP-SMX prophylaxis, and 66 had received. The incidence density of major infection was found to be significantly lower in TMP-SMX group (1.25 per 100 person year) as compared to those not on TMP-SMX group (11.201 per 100 person year); P < 0.001 (95% CI 0.027 - 0.449) and odds ratio of 0.03 (CI 0 - 0.24).

CONCLUSION: Cotrimoxazole prophylaxis in SLE patients on immunosuppression prevents major infections.

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