beta Blockers for glaucoma and excess risk of airways obstruction: population based cohort study
- 14 December 2002
- Vol. 325 (7377) , 1396-1397
- https://doi.org/10.1136/bmj.325.7377.1396
Abstract
We used the Mediplus database to identify patients with no previous diagnosis of airways obstruction. We defined exposed patients as patients who had used ophthalmic topical β blockers for the first time in the period 1993-7. Unexposed patients were randomly selected (loosely matched by age and sex to exposed patients). For validation we inspected a random sample of 40 full longitudinal records of exposed and unexposed patients.Keywords
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