SURVEY OF RISK-FACTORS FOR EXPULSIVE CHOROIDAL HEMORRHAGE - CASE-REPORTS - SUBSTANTIATION OF THE RISK-FACTORS AND THEIR INCIDENCE

To evaluate the interaction of risk factors for expulsive hemorrhage, we evaluated 3 cases of expulsive hemorrhage and 2 of acute intraopera tive choroidal effusion that occurred at the University of Tsukuba Hos pital over a 16-year-period and investigated the common findings in th ese 5 cases. We also selected randomly 500 cataractous cases operated at the University of Tsukuba Hospital and investigated the probabiliti es of risk factors for expulsive hemorrhage in these control cases. Th e 5 affected patients exhibited more than four risk factors of expulsi ve hemorrhage. The probability of more than four risk factors being in volved in any cataract operation was approximately 0.33% (0.17 similar to 0.67%; 95% confidence interval), The incidence of expulsive hemorr hage at our hospital was approximately 0.2%, which is similar to the p robability rate. Thus, we concluded that the development of expulsive hemorrhage was proved to be related to an accumulation of the risk fac tors for expulsive hemorrhage.