Multivariate analysis of factors associated with unplanned admission in 'outpatient' ophthalmic surgery.

We performed a case-control study of patients undergoing planned "outpatient" ophthalmic surgery in order to identify risk factors associated with the need for unplanned admission to the hospital. factors associated with admission included time of completion of surgery, duration of operation, fentanyl dose, use of enflurane, and leukocytosis. A multiple logistic regression model found each of these variables except duration of operation to to be independently associated with unplanned admission with admission included age, present or past medical conditions, use of medications, blood pressure, hematocrit, serum sodium or potassium, and ASA Class. Identification and modification of these factors may help anticipate and/or reduced the incidence of unplanned admission to the hospital in patients undergoing planned outpatient surgery.