Additional procedures after the initial vitrectomy or tap-biopsy in the Endophthalmitis Vitrectomy Study

Area of Science:

• Ophthalmology
• Infectious Diseases

Background:

• Endophthalmitis following cataract extraction requires prompt treatment, often involving vitrectomy (VIT) or tap-biopsy (TAP).
• Additional ocular procedures may be necessary to manage complications or persistent inflammation/infection.

Purpose of the Study:

• To determine the frequency, indications, and outcomes of additional ocular procedures after initial VIT or TAP for post-cataract extraction endophthalmitis.
• To identify risk factors associated with the need for reoperation and their impact on visual acuity.

Main Methods:

• Analysis of observational data from the Endophthalmitis Vitrectomy Study, comparing patients who received additional procedures (n=148) with those who did not (n=272).
• Assessment of the types, indications, and timing of additional procedures.
• Visual acuity was measured 9–12 months post-entry by a masked examiner.

Main Results:

• Within one week, 8% of VIT and 13% of TAP eyes needed additional procedures, primarily for worsening inflammation/infection (86%).
• Positive cultures from early reoperations were more frequent after TAP (71%) than VIT (13%).
• Eyes requiring early additional procedures had significantly worse visual acuity (15% achieving 20/40) compared to those without (57%).

Conclusions:

• The need for additional ocular procedures serves as a marker for more severe endophthalmitis disease.
• Patients undergoing additional procedures, particularly early ones, achieve poorer visual outcomes.
• Virulence of the causative organism and poor initial vision are risk factors for requiring reoperation.