CLINICAL SCIENCES. Vancomycin Concentration in the Vitreous After Intravenous and Intravitreal Administration for Postoperative Endophthalmitis
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1 CLINICAL SCIENCES Concentration in the Vitreous After Intravenous and Intravitreal Administration for Postoperative Endophthalmitis Joseph R. Ferencz, MD; Ehud I. Assia, MD; Leah Diamantstein, BSc; Ethan Rubinstein, MD Objectives: To measure the concentrations of vancomycin in the vitreous of patients with postoperative endophthalmitis after administration of 1 g ofvancomycin hydrochloride intravenously and injection of 1 mg of vancomycin hydrochloride into the vitreous, and to determine whether these concentrations are adequate for treatment of gram-positive infections. Methods: Patients with acute postoperative endophthalmitis were treated with intravenous administration of1gofvancomycin hydrochloride followed by vitrectomy and collection of vitreous samples 1 to 5 hours later. Intravitreal vancomycin and ceftazidime were given. Vitreous samples were cultured and their vancomycin concentrations assayed. Minimal inhibitory concentrations of vancomycin for the isolated vitreal pathogens, and serum and vitreous cidal activity were determined. Results: Eighteen patients with acute postoperative endophthalmitis were studied. Fourteen vitreous samples were available after intravenous vancomycin administration, and 4 vitreous samples were available after intravitreal vancomycin administration. After intravenous injection, vitreous vancomycin concentrations ranged from 0.4 to 4.5 µg/ml. Minimal inhibitory concentrations in these samples, obtained from 10 bacterial isolates, were below the therapeutic levels for most causative organisms, including staphylococci. Vitreous cidal activity values were negative at a dilution of 1:2 in 9 of 10 patients examined. After a 1-mg intravitreal injection, vancomycin concentrations in vitreous samples obtained by a second tap from 4 patients 44 to 72 hours later were 182, 138, 58, and 25 µg/ml. In 2 patients in whom measurements were obtained, vitreous cidal activity values were 1:512 and 1:32. Conclusion: Vitreous vancomycin concentrations for the treatment of gram-positive endophthalmitis were nontherapeutic after intravenous administration but therapeutic after intravitreal administration. Arch Ophthalmol. 1999;117: From the Department of Ophthalmology, Meir Hospital, Sapir Medical Center, Kfar-Saba (Drs Ferencz and Assia); and the Department of Infectious Diseases, Sheba Medical Center, Tel-Hashomer, and Sackler Faculty of Medicine, Tel-Aviv University (Dr Rubinstein and Ms Diamantstein), Israel. BACTERIAL endophthalmitis remains the most serious complication of cataract extraction, with a reported incidence of 0.07% to 0.08%. 1,2 Because most cases are caused by grampositive organisms, 3,4 vancomycin with broad activity against most gram-positive species has become an agentof-choice. 2-7 Routine use of intravenous antibiotic drugs that were previously a mainstay of therapy 8,9 has come into question as a result of findings of the Endophthalmitis Vitrectomy Study (EVS), which showed no benefit. Penetration of intravenous vancomycin into the vitreous cavity after intravenous administration is thought to be limited and variable, based in part on the severity of intraocular inflammation and resultant breakdown of the blood ocular barriers. Although animal data are available, 10,11 to our knowledge the concentration of intravenously administered vancomycin in the infected vitreous of patients with postoperative endophthalmitis has not been reported. See also page 1058 This study measured vancomycin concentrations in the vitreous after its intravenous and intravitreal administration, and determined whether such concentrations are adequate for the treatment of representative organisms that cause gram-positive endophthalmitis in humans. RESULTS Of 18 patients enrolled in the study, endophthalmitis was diagnosed in 15 of them 3 to 9 days after cataract surgery, in 2 of them 12 to 14 days after surgery, and in 1 of them 1 year after surgery. Fifteen vitreous samples were taken for vancomycin assay 1 to 5 hours after intrave- 1023
2 PATIENTS AND METHODS Patients referred to the Department of Ophthalmology, Meir General Hospital, Sapir Medical Center, Kfar-Saba, Israel, between August 1, 1995, and December 31, 1996, for acute endophthalmitis that developed after cataract extraction were enrolled in this prospective study. Cataract surgery had been performed in 1 of 7 surgical centers, including the Sapir Medical Center. Prior informed consent was obtained from all participants. Immediately after confirmation of the diagnosis, all patients except 1 were administered 1gof vancomycin hydrochloride intravenously for 20 minutes. One to 5 hours later, each patient who received vancomycin was taken to the operating room. An anterior chamber maintainer was inserted, and vitreous tap was performed through a pars plana sclerotomy using a vitrectomy probe. A 1-mL tuberculin syringe was connected to the suction tube, and vitreous material was drawn directly into the syringe using the vitrectomy cutter and manual suction. The vitrectomy cutter was then removed, and the residual vitreous material was drawn into the syringe from the dead space of the tubing. Balanced salt solution was injected through the anterior chamber maintainer only after vitreous biopsy, and either core or complete vitrectomy was performed. hydrochloride, 1 mg in 0.1 ml of saline solution, and ceftazidime, 2.25 mg in 0.1 ml of saline solution, were then injected into the vitreous cavity. 7 The vitreous specimens were submitted for microbiologic cultures and determination of vancomycin concentrations. Bacterial isolates were identified according to conventional microbiologic techniques, and the minimal inhibitory concentration (MIC) of vancomycin for each isolate was determined. Vitreous cidal activity (VCA) 12,13 against the specific pathogen was determined with an inoculum of microorganisms in microplate dishes during a 24-hour period. A venous blood sample was drawn at the same time, and the serum was separated. concentrations in the serum and vitreous samples were determined by fluorescence polarization immunoassay (TDX; Abbott Laboratories, North Chicago, Ill). Serum cidal activity was determined according to National Committee for Clinical Laboratory Standards criteria 14 using CFU/mL at 35 C and confirmed by colony count after incubation for 24 hours. Cidal activity was determined as the concentration that killed 99.9% of the inoculum. Four patients in whom no clinical improvement was noted after 2 to 3 days of therapy underwent another vitreous tap and intravitreous vancomycin and ceftazidime administration. concentrations from the specimens obtained from the second vitreous tap were also measured. Statistical analysis was done by one-way analysis of variance using a statistical software program (SPSS-6 for Windows; SPSS Inc, Chicago, Ill). nous vancomycin administration; one sample was taken 100 hours after. In 2 patients (4 and 17), the amount of vitreous sample was not sufficient to be assessed. Table 1 presents data for the 17 patients in whom vancomycin was injected intravenously before vitrectomy. Of 18 vitreous specimens cultured, 15 (83%) grew microorganisms. Of the identified isolates, 10 were Staphylococcus epidermidis, 1 was Staphylococcus aureus, 2 were Streptococcus viridans, 1 was Streptococcus pneumoniae, and 1 was Enterococcus fecalis. concentrations in the vitreous specimens ranged from nonmeasurable levels ( 0.1 µg/ml) to 4.5 µg/ml. Mean vancomycin level in the vitreous specimens 3.5 to 5.0 hours after intravenous administration (2.04 ± 1.33 µg/ml; range, µg/ml) was significantly higher (P.05) than that 1 to 3 hours after intravenous administration (0.49 ± 0.41 µg/ml; range, µg/ml) (Table 2 and Figure 1). In the patient whose vitreous specimen was obtained 100 hours after intravenous injection and in another whose vitreous specimen was obtained 1 hour after intravenous injection, vancomycin levels were below detectable levels. Eleven isolates were available for vancomycin MIC determinations. In 9 patients, levels of vancomycin in the vitreous specimens after intravenous injection and MICs for the corresponding isolate were available. vitreal concentration was higher than the MIC of the isolated pathogen in 5 of these patients, and lower in 4. Vitreous cidal activity was positive at a dilution of 1:32 in only 1 patient. In the remaining 8 patients, the VCA was negative at a dilution of 1:2. This suggests that vancomycin levels in vitreous specimens were too low to confer bactericidal activity in most patients, even though in some, the actual concentration of vancomycin exceeded the MIC. Serum vancomycin levels 1 to 5 hours after intravenous administration were available in 11 patients and ranged from 8.94 to µg/ml (mean, µg/ml). The differences in serum drug level at various time intervals were not statistically significant (Table 3 and Figure 2). Serum cidal activity values were available in 7 patients; serum samples were bactericidal at a dilution of 1:4 in 3 patients, 1:8 in 2, and 1:32 in 1. In 1 patient, serum vancomycin level was available 44 hours after intravenous administration and was 3.11 µg/ml, but the serum cidal activity was negative at a dilution of 1:2 (Table 1, patient 17). In 4 patients (Table 4), vitreal vancomycin levels were available for measurement 2 to 3 days after intravitreal administration of 1 mg of vancomycin hydrochloride. Mean vancomycin concentration was ± µg/ml (range, µg/ml), which was significantly higher than those measured after intravenous administration (P.001). Microbiologic cultures of the 4 vireous specimens taken after intravitreal vancomycin administration were negative. In 2 of these patients (6 and 17), VCA values toward the initially isolated organism were also measured 2 to 3 days after the initial intravitreal vancomycin administration and were positive at dilutions of 1:512 and 1:32. This result is significantly better than that obtained before intravitreal administration 1024
3 Table 1. Levels in Serum and Vitreous Samples After Intravenous Administration for Postoperative Endophthalmitis* Patient Surgery, d Intravenous Level, µg/ml Cidal Activity Vitreous Serum Organism MIC, µg/ml Serum Vitreous Staphylococcus epidermidis NA NA NA S epidermidis NA NA NA S epidermidis NA NA NA NA S epidermidis :4 NA NA Streptococcus viridans 0.50 NA 1: NA Streptococcus pneumoniae 0.50 NA 1: NA S epidermidis NA NA NA S epidermidis 1.90 NA 1: Low NA S epidermidis 1.90 NA 1: S epidermidis :4 1: S viridans :32 1: S epidermidis :4 1: S epidermidis :8 1: Staphylococcus aureus :8 1: Negative... NA Low NA Negative NA 3.11 Enterococcus fecalis NA *MIC indicates minimal inhibitory concentration; NA, not available; ellipses, not relevant; and 1:2, vitreous cidal activity was negative in a dilution of 1:2 and higher. administered as vancomycin hydrochloride. Table 2. Concentration of in Vitreous Specimens After Intravenous Administration* Concentration, Mean ± SD, µg/ml Patients, ± ± ± * administered as 1-g vancomycin hydrochloride. Table 3. Concentration of in Serum Samples After Intravenous Administration* Concentration, Mean ± SD, µg/ml Patients, ± ± ± * administered as 1-g vancomycin hydrochloride n = 2 Vitreous Concentration, µg/ml n = 4 n = 3 n = 7 Serum Concentration, µg/ml n = 4 n = Intravenous Administration of, h Intravenous Administration of, h Figure 1. Mean vitreous vancomycin concentrations after administration of 1 g of vancomycin hydrochloride intravenously. of vancomycin, ie, after its intravenous administration alone (P =.01 by 2 analysis). COMMENT Figure 2. Mean serum vancomycin concentrations after administration of 1 g of vancomycin hydrochloride intravenously. Results of the EVS 3 show that the final visual outcome in patients with endophthalmitis was better than previously described. This is probably attributed to the current management of endophthalmitis using immediate intravitreal antibiotic agents, with or without vitrectomy. 15,16 One conclusion of the EVS was that, based on clinical experience, there is no advantage conferred by intravenous administration of antibiotic agents. Results of several studies demonstrate low or marginal vitreous levels of antibiotic drugs after intravenous, intramuscular, or oral administration in animal models and in humans. Results of other studies 21,22 demonstrate that inflammation significantly increases the ability of cefa- 1025
4 Table 4. Levels in Vitreous Specimens 2 to 3 Days After Intravitreal Administration for Postoperative Endophthalmitis* Patient Surgery, d Intravitreal Vitreal Level, µg/ml Organism From First Vitrectomy MIC, µg/ml Cidal Activity Streptococcus pneumoniae 0.5 NA 1: Streptococcus viridans 0.5 NA NA Enterococcus fecalis 3.0 1:2 1: Negative NA *MIC indicates minimal inhibitory concentration; NA, not available; and ellipses, not relevant. administered as vancomycin hydrochloride. Serum Vitreous zolin sodium and ceftazidime to penetrate the vitreous cavity. This study provides laboratory evidence supporting clinical evidence of the EVS. Gram-positive bacteria are the most frequent cause of postoperative endophthalmitis and were recently reported 23 to be responsible for 94.2% of all cases of confirmed bacterial endophthalmitis. In that study, vancomycin was the only antibiotic drug to which all the gram-positive pathogens were sensitive. was not administered to the subgroup of patients receiving intravenous antibiotic drugs in the EVS 24 because its penetration into the vitreous after intravenous administration is thought to be poor. An earlier study 10 detected no vancomycin in vitreous specimens from either healthy or chemically inflamed eyes after intravenous injection. In a recent study 11 using an animal model, vancomycin levels in vitreous specimens after intravenous injection exceeded the MIC for the gram-positive pathogens usually responsible for endophthalmitis. In another animal study, 25 the efficacy of vancomycin and amikacin sulfate use to prevent experimental staphylococcal endophthalmitis was studied. No significant differences were found between patients treated with antibiotic drugs and saline-treated controls. 25 Many ophthalmologists are reluctant to withhold systemic antibiotic drug therapy, including vancomycin, in this severe, vision-threatening infection, 8,9 and some even recommend starting intravenous vancomycin treatment before a microbiologic diagnosis is established. 26 We are aware of no clinical studies in which vancomycin concentrations in the infected vitreous of patients with postoperative endophthalmitis have been measured after intravenous administration of the antibiotic agent. Results of our study demonstrate erratic penetration by a single dose of intravenous vancomycin in eyes with endophthalmitis, confirming that intravenous therapy with vancomycin cannot be relied on as a sole mode of therapy in patients with postoperative endophthalmitis of which the suspected causative pathogens are gram-positive cocci. The therapeutic level of an antibiotic agent depends on its MIC for a specific microorganism and on its concentration at the site of infection. The therapeutic adequacy of antibiotic drug concentrations in the serum and vitreous specimens can be confirmed by measurement of serum cidal activity or VCA. In this study, the MIC of vancomycin toward S epidermidis the most common causal agent of gram-positive endophthalmitis after cataract extraction was 1.9 µg/ml, and the MIC of other isolated bacteria was 0.5 to 3.0 µg/ml. levels in serum samples of all patients after intravenous injection were, as expected, much higher than the MICs. Serum cidal activity was positive at a dilution of 1:4 to 1:32, confirming that vancomycin had reached an adequate therapeutic level in the serum samples. In contrast, vancomycin levels in the vitreous specimens of the same patients were higher than the MICs for S epidermidis (1.9 µg/ml) in only 6 of 14 patients. Even when the vancomycin level in the vitreous specimen was higher than the MIC of the specific pathogen, the VCA was sufficiently high (1:32) in only 1 patient. Vitreous vancomycin levels were higher 4 to 5 hours after intravenous injection than after 3 hours or less (Figure 1). It is, therefore, possible that after multiple doses of intravenous vancomycin, vitreal vancomycin levels might be higher than those attained by a single intravenous dose, and perhaps even be therapeutic. The apparent paradox of adequate vitreal vancomycin concentrations, together with low VCA, could possibly be explained in terms of the binding of vancomycin to proteins present in the inflamed vitreous. Such binding might diminish the antibacterial activity of this drug, but the bound vancomycin might nevertheless be recognized as free vancomycin in an assay based on chemical detection rather than on microbiology. In this study, determination of the vitreous levels was not delayed for more than 5 hours after administration of the drug because it was considered unethical to place the patient at risk by delaying surgery. In 4 patients, it became necessary to perform a second vitrectomy and intravitreal injection (Table 4); thus, intravitreal vancomycin levels could be measured 2 to 3 days after a single injection. Vitreal vancomycin levels in these 4 patients were up to 100 times higher than after intravenous injection alone, and the VCA was present at dilutions of between 1:32 and 1:514. This finding is in accordance with an experimental study 27 in rabbit eyes that demonstrated high levels of vitreous vancomycin 48 hours after its intravitreal injection. In conclusion, intravitreal concentration of vancomycin, the most effective antibiotic drug for treating gram-positive endophthalmitis, usually does not reach therapeutic concentrations after intravenous administration of a single dose. Therefore, intravenous injection of vancomycin cannot replace its intravitreal administration. Administration of a single intravitreal vancomycin dose maintains high and effective vitreous levels for at least 3 days. Therefore, in postoperative endophthalmitis caused by gram-positive cocci, the addition of intravenous vancomycin administration is probably not indicated. 1026
5 Accepted for publication April 7, Presented at the annual meeting of the American Academy of Ophthalmology, San Francisco, Calif, October 26, Corresponding author: Joseph R. Ferencz, MD, Department of Ophthalmology, Meir Hospital, Sapir Medical Center, Kfar-Saba 44281, Israel ( REFERENCES 1. Javitt JC, Street DA, Tielsch JM, et al. National outcome of cataract extraction: retinal detachment and endophthalmitis after outpatient cataract surgery. Ophthalmology. 1994;101: Kattan HM, Flynn HW Jr, Pflugfelder SC, Robertson C, Forst RK. Nosocomial endophthalmitis survey: current incidence of infection after intraocular surgery. Ophthalmology. 1991;98: Endophthalmitis Vitrectomy Study Group. Results of the Endophthalmitis Vitrectomy Study. Arch Ophthalmol. 1995;113: Han DP, Wisniewski SR, Wilson LA, et al. Spectrum and susceptibilities of microbiologic isolates in the Endophthalmitis Vitrectomy Study. Am J Ophthalmol. 1996;122: Oum BS, D Amico DJ, Kwak HW, Wong KW. Intravitreal antibiotic therapy with vancomycin and aminoglycoside: examination of the retinal toxicity of repetitive injections after vitreous and lens surgery. Graefes Arch Clin Exp Ophthalmol. 1992; 230: Smith MA, Sorenson JA, Lowy FD, Shakin JL, Harrison W, Jakobiec A. Treatment of experimental methicillin-resistant Staphylococcus epidermidis endophthalmitis with intravitreal vancomycin. Ophthalmology. 1986;93: Forster RK. Endophthalmitis. In: Tasman W, Jaeger EA, eds. Duane s Clinical Ophthalmology. Vol 4. Philadelphia, Pa: Lippincott-Raven; 1996: Baker AS, Durand M. The Endophtholmitis Vitrectomy Study [letter]. Arch Ophthalmol. 1996;114: Flynn HW Jr, Meredith TH. The Endophtholmitis Vitrectomy Study [letter]. Arch Ophthalmol. 1996;114: Pryor J, Apt L, Leopol I. Intraocular penetration of vancomycin. Arch Ophthalmol. 1962;67: Meredith TA, Aguilar HE, Shaarawi A, Kinkaid M, Dick J, Neisman M. levels in the vitreous cavity after intravenous administration. Am J Ophthalmol. 1995;119: Pearson RD, Steigbigel RT, Davis HT, et al. Method for reliable determination of minimal lethal concentrations. Antimicrob Agents Chemother. 1980;18: National Committee for Clinical Laboratory Standards (NCCLS). Methods for Determining Bactericidal Activity of Antimicrobial Agents: Tentative Guidelines. Villanova, Pa: NCCLS; NCCLS document M26-T. 14. National Committee for Clinical Laboratory Standards (NCCLS). Methods for Determining Bactericidal Activity of Antimicrobial Agents: Tentative Guidelines.2nd ed. Villanova, Pa: NCCLS; NCCLS document M26-T. 15. Baum J, Peyman GA, Barza M. Intravitreal administration of antibiotic in treatment of bacterial endophthalmitis, III: consensus. Surv Ophthalmol. 1982;26: Meredith TA. Vitrectomy of infectious endophthalmitis. In: Ryan SJ, ed. Retina. Vol 3. 2nd ed. St Louis, Mo: Mosby Year Book Inc; 1994: Barza M, Kane A, Baum J. Oxacillin for bacterial endophthalmitis: subconjunctival, intravenous, both or neither? Invest Ophthalmol Vis Sci. 1980;19: Kane A, Barza M, Baum J. Penetration of ocular tissues and fluids by moxalactam in rabbits with staphylococcal endophthalmitis. Antimicrob Agents Chemother. 1981;193: Rubinstein E, Goldfarb J, Keren G, Blumenthal M, Treister G. The penetration of gentamycin into the vitreous humor in man. Invest Ophthalmol Vis Sci. 1983; 24: Keren G, Alhalel A, Bartov E, Kitzes-Cohen R, Rubinstein E, Treister G. The intravitreal penetration of orally administered Ciprofloxacin in humans. Invest Ophthalmol Vis Sci. 1991;32: Martin DF, Ficker LA, Aguilar HA, Gardner SK, Wilson LA, Meredith TA. Vitreous cefazolin levels after intravenous injection: effects of inflammation, repeated antibiotic doses, and surgery. Arch Ophthalmol. 1990;108: Meredith TA. Antimicrobial pharmacokinetics in endophthalmitis treatment: studies of ceftazidime. Trans Am Ophthalmol Soc. 1993;91: Han DP, Wisniewski SR, Wilson LA, et al. Spectrum and susceptibility of microbiological isolates in the Endophthalmitis Vitrectomy Study. Am J Ophthalmol. 1996;122: Dorf BH. The Endophthalmitis Vitrectomy Study [editorial]. Arch Ophthalmol. 1991; 109: Marrakchi-Benjaafar S, Cochereau I, Pocidalo JJ, Carbon C. Systemic prophylaxis of experimental Staphylococcal endophthalmitis: comparative efficacy of sparfloxacin, pefloxacin, imipenem, vancomycin and amikacin. J Infect Dis. 1995; 172: Ormerod LD, Ho DD, Becker LE, et al. Endophthalmitis caused by coagulasenegative staphylococci, 1: disease spectrum and outcome. Ophthalmology. 1993; 100: Aguilar HE, Meredith TA, El-Massry A, et al. levels after intravitreal injection: effects of inflammation and surgery. Retina. 1995;15: Ophthalmic Pathology Fellowship The American Ophthalmological Society is offering a new 2-year postgraduate fellowship for training in ophthalmic pathology. Applicants must be graduates of a medical school accredited by the American Medical Association, citizens of the United States, and have plans for an academic career. Deadline for submission of application is January 15, 2000, for fellowship starting in July Please direct all inquires and requests for application materials to Froncie A. Gutman, MD, AOS-Knapp Fund, Cleveland Clinic Foundation, 9500 Euclid Ave, Desk A-31, Cleveland, OH 44195, (216)
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