with the use of contaminated ocular irrigating fluids
• causative organisms usually represent
bacteria from patient’s own periocular flora, introduced into the eye during surgery.
• no difference in yield between cultures
obtained by needle tap vsss vitreous
biopsy vs TPPV
• Failure to obtain +ve cultures • - low microbial counts • - fastidious organisms (require specialised culture medium) • - spontaneous sterilization during oculr inflammatory response eg staph
pathogens after a 1-2day pre-op course
• - not proven to reduce the incidence of endophthalmitis • - opponents argue this may lead to antibiotic resistance or induce allergic reactions • - should be bactericidal to gram +ve and gram -ve bacteria • - treatment should be 1-2 days pre-op to reduce the replacement of indigenous flora