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   Table of Contents      
ORIGINAL ARTICLE
Year : 2020  |  Volume : 68  |  Issue : 11  |  Page : 2445-2450

Acute endophthalmitis after penetrating and endothelial keratoplasty at a tertiary eye care center over a 13-year period


1 Cornea and Anterior Segment Services, L V Prasad Eye Institute, Hyderabad, Telangana, India
2 Ophthalmic Biophysics, L V Prasad Eye Institute, Hyderabad, Telangana, India
3 Cornea and Anterior Segment Services; Ramayamma International Eye Bank, L V Prasad Eye Institute, Hyderabad, Telangana, India
4 Jhaveri Microbiology Center, L V Prasad Eye Institute, Hyderabad, Telangana, India
5 Smt. Kanuri Santhamma Centre for Vitreo-Retinal Diseases, L V Prasad Eye Institute, Hyderabad, Telangana, India

Date of Submission11-Jan-2020
Date of Acceptance09-May-2020
Date of Web Publication26-Oct-2020

Correspondence Address:
Dr. Sunita Chaurasia
Cornea and Anterior Segment Services, Medical Director, Ramayamma International Eye Bank, L V Prasad Eye Institute, L V Prasad Marg, Banjara Hills, Hyderabad - 500 034, Telangana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_71_20

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  Abstract 


Purpose: To evaluate the clinico-microbiological profile, donor cornea risk factors, and outcomes of postkeratoplasty endophthalmitis at a tertiary care center. Methods: Retrospective analysis of charts of 28 consecutive patients (28 eyes) of acute endophthalmitis following either an endothelial keratoplasty (EK) or an optical penetrating keratoplasty (PK) surgery, performed between 2006 and 2018 (13-year period). Positive microbiology, identification and classification of predisposing factors, surveillance of utilized paired donors, treatment outcomes, and differences in the rate and severity of the event between optical penetrating and endothelial keratoplasty. Results: The estimated incidence of endophthalmitis was 0.23% in the entire cohort; it was 0.34% and 0.15%, after EK and PK, respectively (P = 0.049). The median time of endophthalmitis was 4.5 days postsurgery. Donor-related endophthalmitis was recognized in 7/28 (25%) eyes. Culture positivity was 68% (n = 19 of 28). Bacteria was isolated in 84% (n = 16 of 19) instances; Gram-negative bacilli were more common (87.5%; 14 of 16), and Pseudomonas species (50%; 7 of 14) was the most common Gram-negative bacterium. Majority (>75%) of the Gram-negative bacteria were resistant to all fluoroquinolones, aminoglycosides, 3rd generation cephalosporins, and meropenam; 1/3rd were resistant to imipenem; and 90% were sensitive to colistin. Treatment included intraocular antibiotic injections (96.4%), vitrectomy (42.9%), and therapeutic keratoplasty (50%). In 85.7% (24 of 28), globe was salvaged. The final vision was 20/200 or better in 39.1% (9 of 23) eyes. Conclusion: EK carried a higher risk of endophthalmitis than PK in this cohort. Bacterial infection was more common in this series, with Gram negative bacilli being the commonest organisms. Multidrug resistance was common (~75%) in Gram negative isolates.

Keywords: Endothelial keratoplasty, penetrating keratoplasty, post keratoplasty endophthalmitis


How to cite this article:
Das S, Ramappa M, Mohamed A, Chaurasia S, Sharma S, Das T. Acute endophthalmitis after penetrating and endothelial keratoplasty at a tertiary eye care center over a 13-year period. Indian J Ophthalmol 2020;68:2445-50

How to cite this URL:
Das S, Ramappa M, Mohamed A, Chaurasia S, Sharma S, Das T. Acute endophthalmitis after penetrating and endothelial keratoplasty at a tertiary eye care center over a 13-year period. Indian J Ophthalmol [serial online] 2020 [cited 2024 Mar 29];68:2445-50. Available from: https://journals.lww.com/ijo/pages/default.aspx/text.asp?2020/68/11/2445/299101

Shilpa Das, Muralidhar Ramappa, Ashik Mohamed;
The first three authors have contributed equally to this work. The first author is currently a Consultant in Cornea Services at Narayana Nethralaya, Bangalore, India.




Endophthalmitis is a sight-threatening complication after keratoplasty. The various causes of postkeratoplasty endophthalmitis are preoperative contamination of the donor cornea (that can occur during retrieval, storage, and processing), inadequate asepsis during surgery, and postoperative factors (such as septic focus in the recipient, trauma, and wound leaks).[1],[2] The standard of care to reduce the risk of contamination during donor cornea harvesting includes appropriate donor screening, instillation of povidone iodine and antibiotic in the cul-de-sac before cornea excision, and incorporation of antibiotics in the corneal preservation medium.[3],[4],[5],[6] Despite many preventive measures adopted during cornea harvesting, storage, and surgery, the risks of postkeratoplasty endophthalmitis are never completely eliminated. There is no definite correlation between positive donor corneal rim cultures and the development of postoperative endophthalmitis.[7],[8] The unquantifiable factors such as load, virulence, and type of microorganisms, in addition to the recipient factors, may be the other predisposing risk factors for postkeratoplasty infections.[2],[9],[10] There are fewer published papers on endophthalmitis following endothelial keratoplasty (EK) compared to endophthalmitis following penetrating keratoplasty (PK). Gram-positive bacteria and Candida species are the most common microorganisms identified in post PK and post EK endophthalmitis, respectively.[9],[11],[12],[13],[14],[15]

In this study, we report the incidence, clinico-microbiological profile, and outcomes of endophthalmitis following optical PK and EK in a large referral tertiary eye care center in South India over a 13-year period.


  Methods Top


The study was approved by the Institutional Review Board and adhered to the tenets of the Declaration of Helsinki. This was a retrospective observational study of patients who developed endophthalmitis after optical PK or EK, operated between January 2006 and December 2018 at a tertiary eye care center in South India. The data were obtained from the eye bank, documented in manual records until 2011 and electronic records (iTransplant, Transplant Connect, Santa Monica, CA, USA) thereafter.

The comprehensive details included patient demographics, indication and type of surgery, and intra and postoperative events. Details of donor death or medical history, eye bank retrieval, and preservation techniques were documented. Wherever available, paired donor cornea details were acquired. Causative organisms were identified by microscopy and cultures of a variety of samples such as the corneal scrapings, vitreous biopsy, anterior chamber (AC) fluid, corneal buttons, donor storage medium, and donor corneoscleral rim, depending upon the availability. Only significant culture results were considered.[16] Antibiotic susceptibility was performed by the disc diffusion and/or epsilometer test (E-test) method. The final anatomical and visual outcomes were analyzed.

Definitions

  • Acute postkeratoplasty endophthalmitis was defined as the one occurring within six weeks of primary surgery. The diagnosis was based on the clinical features of graft infiltrate, anterior chamber exudates, vitreous exudates, and/or vitreous echoes on B-scan. These were subclassified into microbiologically proven and clinical (microbiology negative) endophthalmitis cases.
  • Donor-related endophthalmitis was the one when the same organism was isolated from the patient (cornea/anterior chamber/vitreous) and the donor cornea (storage medium/corneoscleral rim preserved after keratoplasty).


Eye bank processes and protocols before and after reporting of adverse events following keratoplasty

The institute affiliated eye bank retrieves donor corneas through Hospital-based Cornea Retrieval Program (HCRP), voluntary eye donations, and from its affiliated cornea collection centers.[17] The institute protocol of cornea retrieval, in brief, consists of cleaning the surgical site with 5% povidone iodine, decontamination of the ocular surface and cul-de-sac with 2.5% povidone iodine with a contact time of 5 min. The donor corneas are preserved in McCarey–Kaufman (MK) medium. As MK medium is prepared in the eye bank and is cost-effective, it is the favored mode of corneal preservation at the eye bank. Following endothelial imaging using specular microscope and a detailed slit lamp evaluation, the donor cornea is allocated for keratoplasty. The precut preparation for EK using microkeratome device (Moria Microkeratome system, MoriaInc, Antony, France) was performed by the surgeon in the operating room until 2012 and by a trained technician in a clean room at the eye bank under a laminar flow hood thereafter.

Following keratoplasty, the peripheral corneoscleral rim is returned to the eye bank and preserved for 4–6 days. The institute infection control protocol calls for a detailed microbiological investigation of the preserved corneoscleral rim in the event of an adverse event (keratitis or endophthalmitis) notification in the early postkeratoplasty period. The underlying causes (donor-related or others) and protocol deviations, if any, are ascertained. The mate pair of the donor cornea is traced for any evidence of infection in the recipient eye. Corneal scrapings are taken if the graft shows epithelial defect and superficial infiltration. Diagnostic AC taps with or without vitreous biopsy are sent for microbiological analysis. In the event of a therapeutic PK performed after the diagnosis of endophthalmitis, one half of the corneal button is sent for microbiology and the other half for histopathology evaluation. B- scan ultrasonography is performed wherever vitreous evaluation is not possible using indirect ophthalmoscope at highest illumination. All clinically confirmed cases of endophthalmitis are primarily managed in the retina service in close consultation with the cornea service and microbiology laboratory.

The management decision in the retina service was based on the comprehensive clinical examination and the ultrasonography.[18] As a general guideline, all eyes were advised endophthalmitis vitrectomy study (EVS) and recommended intravitreal antibiotics initially (vancomycin 1.0 mg in 0.1 ml and ceftazidime 2.25 mg in 0.1 ml).[19] Further management was based on the clinical appearance, anatomical integrity of the globe, and security of primary corneal graft; generally a pars planavitrectomy (PPV) when the graft appeared secured, therapeutic PK when the graft did not appear secured, and evisceration when either procedures were not possible was performed.

Statistics

Statistical analysis was performed using statistical software Origin v7.0 (Origin Lab Corporation, Northampton, MA, USA). Continuous data were checked for the normality of distribution by Shapiro–Wilk test and described by either mean and standard deviation for data with normal distribution or median and inter-quartile range (IQR) if otherwise. Equality of variance was assessed by Levene test. Categorical data were described in proportions. Continuous parametric data with equal variance between EK and PK groups were compared by t-test and nonparametric data or parametric data with unequal variance by Mann–Whitney test. Categorical data were compared by Chi-square test or Fisher exact test. A P value of <0.05 was considered statistically significant.


  Results Top


[Table 1] summarizes the demographics and the donor characteristics of patients who developed endophthalmitis after keratoplasty. [Table 2] and [Figure 1] summarize the year wise incidence (by type of keratoplasty) of postkeratoplasty acute endophthalmitis at the institute over the last thirteen years.
Table 1: Demographics, donor details, and clinical characteristics of eyes with acute postkeratoplasty endophthalmitis

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Table 2: Annual trends in rate of endophthalmitis: Optical penetrating keratoplasty (PK) versus endothelial keratoplasty (EK)

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Figure 1: Annual Trends in the rate of endophthalmitis

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In the 13-year study period, from January 2006 to December 2018, a total of 12,065 corneas were used for keratoplasty - 56% (n = 6750) corneas for optical PK and 44% (n = 5315) corneas for EK. Acute endophthalmitis developed in 0.23% (n = 28) eyes - 0.15% (10 of 6750) after optical PK and 0.34% (18 of 5315) after EK. Overall, the incidence of postEK endophthalmitis was significantly greater than postoptical PK endophthalmitis [P = 0.049; odds ratio EK: PK = 2.29 (95% confidence interval 1.06–4.97). There was no significant difference between post PK and post EK endophthalmitis between 2012 and 2018. Further, there were no occurrence of endophthalmitis postoptical PK in the last 5 years. Prior to 2012, donor preparation for EK was done by surgeons and thereafter by the technicians in the eye bank. The endophthalmitis rates following EK when donor was prepared by surgeons was 0.64% and when prepared in eye bank was 0.25% (P = 0.04).

Demographics

Mean age of the patients was 50.9 ± 16.7 years (range, 11–81 years). There were 20 (71.4%) males and 8 (28.6%) females. Pseudophakic corneal edema (32.1%; n = 9 eyes) was the major primary indication for keratoplasty; other indications included vascularized corneal scar, Fuchs endothelial corneal dystrophy, failed previous PK, macular stromal dystrophy, aphakic corneal edema, and iridocorneal endothelial syndrome. Thirteen of 28 eyes (46.4%) received additional intervention [10 - Cataract extraction with intraocular lens (IOL) implantation, 2 - IOL implantation, 1 - IOL explantation] at the time of keratoplasty. The median interval from keratoplasty to the occurrence of endophthalmitis was 4.5 days (IQR, 1–6 days); there was no significant difference in the occurrence of endophthalmitis following EK and PK (median 3 days in EK, IQR, 1–6 days and median 5 days in PK, IQR, 2–22 days, respectively; P = 0.26).

Donor characteristics

The mean age of the donors was 47.6 ± 18.8 years (range, 18–80 years). The major causes of donor death were road traffic accident (39.3%; n = 11) and cardiorespiratory arrest (35.7%; n = 10), [Table 1]. Nearly half of the donor corneas were harvested from the hospital (46.4%; n = 13) and the remaining from mortuary and home (32.2%, n = 9; and 21.4%, n = 6), respectively. Median death-to-preservation time was 4.3 h (IQR, 2–5.5 h). Median duration of preservation was 46 h (IQR, 26–72 h). All donor corneas were preserved in MK medium. Two donor corneas were shifted to Cornisol preservation medium after precut preparation for EK. Mean endothelial cell density of donor cornea was 2796 ± 292.4 cells/mm2.

Microbiological spectrum [Table 3]
Table 3: Microbiological details of clinical samples

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The samples for microbiology were obtained from the corneal scrapings (n = 10 eyes), undiluted vitreous (n = 24 eyes), and half of the corneal button (n = 14 eyes). Culture was positive in 67.9% (n = 19 of 28) instances - 84.2% (16 of 19) bacterial and 15.8% (3 of 19) fungal. Gram-negative bacteria were more common (14 of 16; 87.5%) and Pseudomonas spp. (7 of 14; 50%) was the commonest Gram-negative isolate. Majority (>75%) of the Gram-negative bacteria were resistant to all fluoroquinolones, aminoglycosides, 3rd generation cephalosporins, and meropenam; 1/3rd were resistant to imipenem; and 90% were sensitive to colistin.

Donor-related endophthalmitis

Seven (25%) of the 28 cases of endophthalmitis were definitively attributable to donor contamination after microbiological work up. In these 7 eyes, same microorganism grew from the recipient eye with endophthalmitis and the donor cornea (MK medium and peripheral skirt of corneo-scleral rim). All these 7 cases of endophthalmitis were after EK. Six eyes had multidrug-resistant Gram-negative bacilli (of which one had mixed infection with Corynebacterium jeikeium and Proteus spp.) and one eye grew Staphylococcus aureus. Out of 7, the cause of donor's death was road traffic accident in six and electric shock in one. In 2/7 cases, the recipient of the mate cornea also developed endophthalmitis with the same species of microorganisms. The mate pairs of 5/7 cases were not utilized for keratoplasty; however, the microbiological cultures of the storage media and the rim showed the same spectrum of organisms as in the recipient in 4/5 donor mates.

Non donor related endophthalmitis

Of the 21 eyes, 10 eyes had PK and 11 had EK. In 8/21 (38.1%) eyes (3 PK and 5 EK), the organism isolated was Gram-negative bacilli, one eye had Gram-positive bacilli and 3 eyes grew fungus. Microbiology was negative in the remaining 9 eyes. The causes of donor's death were road traffic accident in 6, natural cause of death in 2, cardiac arrest in 9, carcinoma stomach in 2, acute pancreatic necrosis in 1, and suicidal burn related death in 1.

Management and outcome [Table 4]
Table 4: Management and outcomes in eyes with acute post.keratoplasty endophthalmitis

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All medical and surgical interventions were performed after a detailed discussion of all available options and consent of the patient (one of the parents in case of a minor). The common surgical management included intraocular antibiotics injections in all eyes, but one where primarily evisceration was decided after due consideration of the status of the eye at clinical presentation. The eviscerated contents in this patient grew Pseudomonas aeruginosa, which was multidrug resistant but was sensitive to imipenem and colistin. The intravitreal antibiotic injections were given either alone or along with another surgical intervention (PPV in 12 eyes, therapeutic PK in 14 eyes, and lenticule extraction in 1 eye). Another eye was eviscerated because of poor response despite PPV and multiple intravitreal antibiotics. Two eyes eventually developed phthisis bulbi. The parameters such as type of keratoplasty (PK/EK), donor related infection implicated microorganisms, and multidrug resistance showed no significant bearing on the anatomical globe restoration.

Median follow-up after diagnosis of endophthalmitis was 9 months (IQR, 2–36 months). At the time of diagnosis of endophthalmitis, 22 eyes had a median best-corrected visual acuity (BCVA) of 1.48 logMAR (Snellen equivalent 20/604) (IQR, 0.70 to 3.00 logMAR) and four eyes had vision of light perception or projection. At the last follow-up, 7 of 28 eyes (25%) maintained clear grafts. Excluding 4 eyes (2 where evisceration was done and 2 that developed phthisis), median BCVA was 1.00 logMAR (Snellen equivalent 20/200) (IQR, 0.48 to 2.09 logMAR) in 17 eyes, light perception in 4 eyes, and no PL in 2 eyes.


  Discussion Top


The incidence of endophthalmitis after PK has been variably reported and ranges between 0.1% and 2.47% from various centers of the world.[2],[9],[12],[13] EK has gained popularity since late 1990s, and hence, the literature on post EK endophthalmitis is relatively sparse. Some studies have reported a higher risk endophthalmitis after EK, and could be related to (1) additional steps in the donor cornea preparation for EK, (2) the warming cycle in precut preparation for EK (believed to increase the risk of fungal infection), and (3) additional intraoperative manipulation.[20],[21] However, a recent report has suggested a lower incidence of endophthalmitis following EK and PK.[22]

In the 13-year period, the overall incidence of endophthalmitis after PK (0.15%) and EK (0.34%) at our institute was 0.23%, and it is comparable with prior reports in literature. Comparing the two periods, 2006–2011 (6 years) and 2012–2018 (7 years) there was decrease in the incidence of endophthalmitis following PK (0.19% to 0.12%) and following EK (0.64% to 0.25%) [Table 2]. We are unable to ascribe to any specific reasons though; we presume it must be related to better screening of patients before surgery.

Many authors have reported fungal endophthalmitis following EK.[15],[16],[21],[22],[23] But in our series, bacterial infection was the commonest (16 of 28; 57%), of which Gram-negative bacteria were more common. Pseudomonas species was the predominant Gram-negative bacterial isolate. Majority of post EK endophthalmitis was also Gram-negative bacterial infection. This is similar to our earlier reports on postoperative and posttrauma endophthalmitis.[24] Fungus was isolated in 3 of 28 (10.7%) eyes, 1 post EK and 2 after PK, and these were two molds (Aspergillus) and one yeast (Candida). We identified that >75% of the Gram-negative organisms were resistant to all fluoroquinolones, aminoglycosides, 3rd generation cephalosporins, and meropenam; one-third were resistant to imipenem; and 90% were susceptible to colistin. Three-fourths of Gram-negative organisms resistant to multiple antibiotics did not appear surprising in view of the increasing bacterial resistance in hospital premises from where the cornea was retrieved.[19],[25] Looking at the spectrum of postkeratoplasty endophthalmitis and the antibiotic sensitivity pattern of these organisms, we wonder if there is a need to add an additional antibiotic such as polymixin E or colistin in the donor cornea storage medium, after appropriate studies in laboratory and human cornea. The new antibiotics should be capable of inhibiting filamentous fungi and Candida spp; incidentally both polymixin B and colistin are known to inhibit these microorganisms.[26]

We routinely use MK medium for corneal preservation as against Optisol in developed countries. This choice is purely based on economic reasons. The antibiotics in the two preservation media are comparable, however, the preservation time is shorter in MK medium than Optisol medium, and hence the preservation to utilization time is likely to be shorter in MK medium preserved corneas.

This may be speculated as one of the reasons for the differences in the microbiological spectrum between our cohort compared to the reports from US.

The anatomical restoration of the eyes was favorable in a majority (85.8%) of the patients. The visual outcomes were poor. Multidrug resistant-Gram-negative bacteria isolated in the 4 eyes needed evisceration or resulted in phthisis bulbi. The final vision was 20/200 or better in over 40% of patients.

The limitation of the study is that the analysis of risk factors was done in a retrospective manner. Hence, the information on details of donor's death, treatment strategy, and antibiotic regimen used during their hospitalization could not be covered extensively. Also, elaborate details of intraoperative factors such as tissue handling, surgical difficulties, and prolonged surgical time could not be studied.

To conclude, the microbiological spectrum of organisms in endophthalmitis after keratoplasty in India is different than the ones reported in the Western literature. Multidrug resistance is an important concern. Further studies are needed to add or replace the current antibiotic policy in MK medium often used for corneal preservation in India.


  Conclusion Top


In our study, the rate of endophthalmitis was higher in EK than in PK, as reported previously. Bacterial endophthalmitis was commoner than fungal endophthalmitis, contrary to other publications. Multi-drug resistant Pseudomonas spp. was noted in this study as a frequent pathogen.

Funding for research

Hyderabad Eye Research Foundation, Hyderabad.

Acknowledgements

The authors thank the Eye Bank team members for providing the data support needed for the study.

Financial support and sponsorship

Hyderabad Eye Research Foundation, India.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

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    Figures

  [Figure 1]
 
 
    Tables

  [Table 1], [Table 2], [Table 3], [Table 4]


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