To identify the risk factors, prognostic factors, and clinical outcomes of pat ients with perioperative appositional suprachoroidal hemorrhage (ASCH). Case-co ntrol study. Tertiary referral center. Subjects included all patients with perio perative ASCH documented by B-scan ultrasound between May 1990 and March 2001. Two or three control patients were selected for each case, matched by surgeon, p rocedure, and date of surgery within 1 month. Surgery was performed as necessary . main outcome measures. The odds of ASCH associated with clinical risk factors. secondary outcome measure: visual acuity. Thirty-seven cases with ASCH were identified. Ninety-two proce dure-and surgeon-matched control subjects (2.48:1) were selected. Twenty-six cases (71%) of ASCH were related to a glaucoma operation. Risk factors for the development of ASCH included previous vitrectomy (P=.003, odds ratio of 12) and older age (P=.007, odds ratio 1.57/decade of increasing age). Hypertension was f ound to be protective (P=.02, odds ratio of 0.33). Factors associated with a poo r visual outcome in patients with ASCH included apposition >30 days (P=.01), his tory of uveitis (P=.04), history of dry age-related macular degeneration (P=.05 ), and history of extracapsular cataract extraction (P=.05). Median pre-ASCH vi sual acuity was 20/100, and final median visual acuity was 20/1600. Risk factors for the development of ASCH include previous vitrectomy and older age. Patients with these risk factors should be informed of their greater chance of poor visu al acuity and anatomic outcomes secondary to the development of ASCH.
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