Abstract：
OBJECTIVE:To investigate the risk factors and control mechanisms used to control the outbreak of diffuse lamellar keratitis (DLK) associated with laser in situ keratomileusis (LASIK) and examine the relationship between DLK and endotoxins released from sterilizer biofilm reservoirs. DESIGN:Clinic-based cohort and laboratory study. PARTICIPANTS:All patients undergoing LASIK at our clinic from October 7, 1998 through August 31, 1999. The case definition was a diffuse infiltrate in the interface developing within the first week after surgery. INTERVENTIONS:Biofilm control in the sterilizer, changes in sterilizer, distilled water, instruments, and irrigating fluids. MAIN OUTCOME MEASURES:The incidence of DLK after LASIK surgery. RESULTS:There were 983 evaluable patients, with three whose DLK status was not recorded. There were 52 cases of DLK. Burkholderia pickettii was isolated from the sterilizer reservoir. Potential risk factors and associations, for which there was no significant difference, included age and sex of the patients, surgeon, operating suite temperature or humidity, drapes used, saline solutions used, time of day the surgery was performed, and microkeratome use. Sterilizers 1 and 2, before biofilm control, were compared with sterilizer 3, after control. The relative risk was 9.4 (confidence limits [CL], 7.5-11.8) for sterilizer 1 versus 3 and 18. 7 (CL, 11-32) for sterilizer 2 versus 3. Three cases occurred after biofilm control, but were sporadic in nature and associated with epithelial defects. CONCLUSIONS:Clusters of DLK may be related to endotoxins released from gram-negative biofilms in sterilizer reservoirs. We experienced an outbreak of DLK affecting 52 patients and isolated B. pickettii from the sterilizer reservoir. Epidemiologic investigation showed that biofilm control in the sterilizer reservoirs was associated with a significant reduction in the development of DLK. We encourage any clinics that experience a cluster of DLK to consider microbiologic and epidemiologic investigation for the effectiveness of sterilizer biofilm control.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Holland SP,Mathias RG,Morck DW,Chiu J,Slade SGdoi
10.1016/s0161-6420(00)00246-3subject
Has Abstractpub_date
2000-07-01 00:00:00pages
1227-33; discussion 1233-4issue
7eissn
0161-6420issn
1549-4713pii
S0161-6420(00)00246-3journal_volume
107pub_type
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