Comparative Effectiveness of Antibiotic Prophylaxis in Cataract Surgery

Area of Science:

• Ophthalmology
• Infectious Disease Prevention

Background:

• Intracameral injection is recognized as an effective method for preventing ocular infections.
• However, a lack of controlled studies in the United States necessitates further investigation into antibiotic prophylaxis efficacy.
• Post-cataract extraction endophthalmitis remains a significant concern for ophthalmic surgeons.

Purpose of the Study:

• To evaluate the effectiveness of topical and intracameral antibiotics in preventing endophthalmitis after cataract surgery.
• To compare the efficacy of different antibiotic prophylaxis regimens, including monotherapy and combination therapy.

Main Methods:

• An observational, longitudinal cohort study was conducted using electronic health records from Kaiser Permanente, California (2005-2012).
• Data from 315,246 cataract procedures in 204,515 patients were analyzed.
• Logistic regression was used to estimate the adjusted odds ratio (OR) and 95% confidence interval (CI) for endophthalmitis risk associated with various antibiotic prophylaxis strategies.

Main Results:

• The incidence of endophthalmitis was 0.07% (0.7/1000 procedures).
• Posterior capsular rupture was a significant risk factor, increasing endophthalmitis risk by 3.68-fold.
• Intracameral antibiotic prophylaxis was more effective than topical agents alone (OR, 0.58; CI, 0.38-0.91).
• Combining topical and intracameral antibiotics did not show increased efficacy over intracameral agents alone (OR, 1.63; CI, 0.48-5.47).
• Topical aminoglycosides were less effective than topical gatifloxacin (OR, 1.97; CI, 1.17-3.31).

Conclusions:

• Surgical complications, such as posterior capsular rupture, are critical risk factors for endophthalmitis.
• Intracameral antibiotic administration is superior to topical antibiotic monotherapy for preventing post-cataract extraction endophthalmitis.
• Adding topical antibiotics to an intracameral regimen does not enhance its effectiveness.