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E. Freeman, M.-H. Roy-Gagnon, E. Fortin, D. Gauthier, M. Popescu, H. Boisjoly; The Annual Incidence Rate of Reported Endophthalmitis After Cataract Surgery in Quebec From 1996-2005. Invest. Ophthalmol. Vis. Sci. 2009;50(13):3552.
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© ARVO (1962-2015); The Authors (2016-present)
To estimate the annual incidence rate and risk factors for endophthalmitis after cataract surgery from 1996-2005 in the province of Quebec, Canada.
De-identified data were obtained from an outpatient physician billing database (Régie de l’assurance maladie du Québec)(RAMQ) on all cases of cataract surgery (procedural code=07261) that occurred in the province of Quebec, which has a single-payer, universal health care system, during the years 1996-2005. For this cohort, records of an International Classification of Disease 9 code for endophthalmitis (ICD-9=360.0) from 1996-2005 were requested from two sources: the RAMQ outpatient database and an inpatient billing database (MEDECHO). Endophthalmitis after cataract surgery was assumed if it occurred within 90 days of the cataract surgery. Those who had a trabeculectomy or corneal transplant within 90 days of cataract surgery and those who had cataract surgery after September 30, 2005 were excluded. Risk factors were examined using chi-square tests and logistic regression.
After exclusions, 490,690 cataract surgeries were performed in the province of Quebec between 1996-2005. There were 754 cases of endophthalmitis that occurred for an overall incidence rate of 0.15% (1.5 per 1000). Factors associated with endopthalmitis included age≥85 (adjusted odds ratio (OR)=1.36, p=0.01), male gender (OR=1.44, p<0.01), surgery from 2003-05 vs 1996-2002 (OR=0.67, p<0.01), and region of cataract surgery as the Montréal-Centre (OR=3.01, p<0.01) and Côte Nord (OR=4.59, p<0.01) regions had higher rates compared to all other regions of Quebec.
The risk of reported endophthalmitis decreased after 2002 from 2003-05. Reasons to explain this decrease should be explored and further research should be done to understand why certain patients have higher risks of endophthalmitis after cataract surgery.
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