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  • Title: Predictors of outcome in thymectomy for myasthenia gravis.
    Author: Budde JM, Morris CD, Gal AA, Mansour KA, Miller JI.
    Journal: Ann Thorac Surg; 2001 Jul; 72(1):197-202. PubMed ID: 11465178.
    Abstract:
    BACKGROUND: Factors determining predictability of response to thymectomy for myasthenia gravis (MG) vary in the literature. METHODS: A 25-year retrospective review (1974 to 1999) of all thymectomies performed at a single institution was undertaken. RESULTS: In 113 consecutive thymectomies for MG, women comprised 79% (89 of 113 patients), and mean age was 40+/-15 years. Complications occurred in 14% of patients (16 of 113). In-hospital mortality was 0, but 90-day hospital mortality was 0.88% (1 of 113 patients). Follow-up was obtained in 81% (92 of 113 patients) at a mean of 51+/-59 months postoperatively. Complete remission was achieved in 21% of patients (19 of 92), and marked improvement of MG in 54% (50 of 92), for a total benefit rate of 75%. Fourteen percent (13 of 92) were unchanged, and 11% (10 of 92) were worse. Using univariate analysis, sex, age, and pathology correlated significantly with outcome (p < 0.05): 80% of women (57 of 70) benefited from the procedure, versus 57% of men (12 of 21). Eighty percent (57 of 70) of patients less than 51 years of age were improved or in remission, versus 57% (12 of 22) older than 50. Twenty-three percent (5 of 22) of patients with thymoma deteriorated, versus 7.1% (5 of 70) without thymoma. Sex did not significantly correlate in the multivariate model. CONCLUSIONS: Sex, age, and thymic pathology are potential predictors of outcome in thymectomy for MG, and may shape treatment decisions and target higher-risk patients.
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