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   Table of Contents      
REVIEW ARTICLE
Year : 2017  |  Volume : 65  |  Issue : 8  |  Page : 673-677

A literature review and update on the incidence and microbiology spectrum of postcataract surgery endophthalmitis over past two decades in India


1 Department of Microbiology Laboratory, Aravind Eye Hospital, Madurai, Tamil Nadu, India
2 Retina Service, Aravind Eye Hospital, Puducherry, India
3 Department of Cataract, Aravind Eye Hospital, Madurai, Tamil Nadu, India
4 Jhaveri Microbiology Laboratory, Hyderabad, Telangana, India
5 Srimati Kanuri Shantamma Retina Vitreous service, L V Prasad Eye Institute, Hyderabad, Telangana, India

Date of Submission30-Jun-2017
Date of Acceptance31-Jul-2017
Date of Web Publication18-Aug-2017

Correspondence Address:
Taraprasad Das
Srimati Kanuri Santhamma Retina Vitreous Service, L V Prasad Eye Institute, Road No. 2, Banjara Hills, Hyderabad . 500 034, Telangana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_509_17

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  Abstract 


Purpose: The purpose of this study was to review the incidence and microbiology of acute postcataract surgery endophthalmitis in India. Methods: Systematic review of English-language PubMed referenced articles on endophthalmitis in India published in the past 21 years (January 1992–December 2012), and retrospective chart review of 2 major eye care facilities in India in the past 5 years (January 2010–December 2014) were done. The incidence data were collected from articles that described “in-house” endophthalmitis and the microbiology data were collected from all articles. Both incidence and microbiological data of endophthalmitis were collected from two large eye care facilities. Case reports were excluded, except for the articles on cluster infection. Results: Six of 99 published articles reported the incidence of “in-house” acute postcataract surgery endophthalmitis, 8 articles reported the microbiology spectrum, and 11 articles described cluster infection. The clinical endophthalmitis incidence was between 0.04% and 0.15%. In two large eye care facilities, the clinical endophthalmitis incidence was 0.08% and 0.16%; the culture proven endophthalmitis was 0.02% and 0.08%. Gram-positive cocci (44%-64.8%; commonly, Staphylococcus species), and Gram-negative bacilli (26.2%–43%; commonly Pseudomonas species) were common bacteria in south India. Fungi (16.7%-70%; commonly Aspergillus flavus) were the common organisms in north India. Pseudomonas aeruginosa (73.3%) was the major organism in cluster infections. Conclusions: The incidence of postcataract surgery clinical endophthalmitis in India is nearly similar to the world literature. There is a regional difference in microbiological spectrum. A registry with regular and uniform national reporting will help formulate region specific management guidelines.

Keywords: Cataract surgery, endophthalmitis, India, microbiology


How to cite this article:
Lalitha P, Sengupta S, Ravindran RD, Sharma S, Joseph J, Ambiya V, Das T. A literature review and update on the incidence and microbiology spectrum of postcataract surgery endophthalmitis over past two decades in India. Indian J Ophthalmol 2017;65:673-7

How to cite this URL:
Lalitha P, Sengupta S, Ravindran RD, Sharma S, Joseph J, Ambiya V, Das T. A literature review and update on the incidence and microbiology spectrum of postcataract surgery endophthalmitis over past two decades in India. Indian J Ophthalmol [serial online] 2017 [cited 2024 Mar 28];65:673-7. Available from: https://journals.lww.com/ijo/pages/default.aspx/text.asp?2017/65/8/673/213256



Acute postoperative endophthalmitis following cataract surgery is a dreaded complication. Fortunately, the incidence has declined in recent times after changes in surgical techniques, sterilization procedures, and better understanding of the risk factors.[1],[2],[3],[4],[5],[6],[7] The global reported incidence of postcataract endophthalmitis ranges from 0.02% to 0.26%.[1],[2],[3],[4],[5],[6],[8],[9],[10],[11] There is good amount of data on the incidence, risk factors, and outcomes of postcataract endophthalmitis in the Western hemisphere.[12],[13] Analyses of databases such as the Medicare and Medicaid have helped understand the epidemiology of postcataract endophthalmitis, and design treatment guidelines. Two other studies that have had global impacts on practices are the Endophthalmitis Vitrectomy Study (EVS) for acute postcataract surgery bacterial endophthalmitis treatment and the European Society of Cataract and Refractive Surgeons study for cataract surgery endophthalmitis prophylaxis.[10],[14],[15]

India is a large and populous country with diverse geographical profile. Despite the fact that the data collection is not uniform across the country, many large eye care providers, both public and not-for-profit, have published several seminal reports that have formed the basis of this communication.[16],[17],[18],[19],[20],[21],[22],[23],[24],[25],[26],[27],[28],[29],[30] While this may not provide the real world scenario from the entire country, we believe that a literature review of the published Indian reports will indicate the trends on the incidence and microbiologic profiles from major regions of the country.


  Methods Top


A detailed literature search was done using PubMed, Medline, OVID, Cochrane Library, Up to Date and Google Scholar databases with the search terms “cataract,” “postoperative,” “endophthalmitis,” “India,” and “microorganism.” The search period was restricted to 21 years from January 1992 to December 2012. The articles were reviewed to capture the incidence of acute endophthalmitis after cataract surgery. We defined postcataract surgery endophthalmitis as follows: clinical endophthalmitis as inflammation of the posterior segment as evidenced by slit lamp biomicroscopy, ophthalmoscopy and ultrasound, with or without hypopyon; and acute onset endophthalmitis as the one that occurred within 6 weeks following cataract surgery.[31] Articles describing the incidence of endophthalmitis occurring within an eye care facility's own setting (in-house), were selected to report incidence data. Microbiology spectrum was pooled from all articles that reported such data on endophthalmitis from both “in-house” and “referred” cases in the Indian setting. A systematic analysis was not possible due to an inadequate number of articles. Hence, we summarized information from all available reports and present the descriptive data in this communication.

Further, we reviewed the clinical case records and the records from the microbiology laboratories of 2 large eye care facilities, at Madurai and at Hyderabad from January 2010 to December 2014 to document change, if any, of the incidence and microbiology spectrum of in-house acute postcataract surgery endophthalmitis.


  Results Top


Incidence of postcataract endophthalmitis

A total of 99 articles were published from the Indian setting during the 21-year study period. Six of them reported the incidence of postcataract “in-house” endophthalmitis.[16],[18],[22],[24],[30],[32] The incidence of clinical acute postcataract endophthalmitis was from 0.04% to 0.15%, and the incidence of culture positive endophthalmitis was from 0.02% to 0.09% [Table 1]. The South Indian retrospective studies included the ones reported from Chennai, Hyderabad, Madurai, and Puducherry. One prospective study was reported from Bhubaneswar, East India.[32]
Table 1: Reported incidence of endophthalmitis in India

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Spectrum of microorganisms causing early postcataract endophthalmitis

Eight major publications have reported the microbiological spectrum of postcataract surgery acute endophthalmitis that included in-house and referred cases [Table 2].[16],[18],[20],[21],[23],[24],[28],[29] There was a major difference between different regions of the country. While there was a variable combination of bacteria and fungi, the fungal infection incidence varied from 2.7% to 70%, more often reported from the North than South India. The Gram-positive infection varied from 37.6% to 64.8% and the Gram-negative infection incidence varied from 24.3% to 43%.
Table 2: Reported microbiology profile of postcataract surgery endophthalmitis, in-house and referred cases in India

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Cluster infection

Cluster infection has been reported occasionally in Indian literature.[17], 25, [33],[34],[35],[36],[37],[38],[39] These included five reports from South India (Hyderabad, Madurai, Tiruchirappalli, and Vellore) and 6 reports from Central India [Table 3]. Pseudomonas (73.3%) or related species were the most common cause of infection as confirmed by culture and/or genotyping. In most instances, the source could be identified-the anesthetic drops, the phacoemulsification system, the fluid containing the hydrophilic lens, and the air conditioning system.
Table 3: Reported cluster infection in India

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Current trends

The incidence of in-house postcataract surgery acute endophthalmitis between the years 2010 and 2014 at Madurai (South India) was 0.08% (363 eyes of 465,914 cataract surgeries), culture positivity was 30.3%, and culture proven endophthalmitis was 0.02%. Bacteria were the commonest organisms and fungi accounted for 5% of instances. The incidence of in-house postcataract surgery acute endophthalmitis between the years 2010 and 2014 at Hyderabad (South India) was 0.16% (81 eyes of 50,183 cataract surgeries, excluding cluster endophthalmitis), culture positivity was 54.32% and culture proven endophthalmitis was 0.08%. Here, again bacteria were more common and fungi accounted for 6.52% instances [Table 4].
Table 4: Five-year (2010-2014) endophthalmitis data of 2 large tertiary centers in India

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  Discussion Top


The endophthalmitis data (clinical, 0.04%–0.15%; culture proven, 0.02%–0.09%) generated from three major institutions in South India are nearly a decade old.[16],[18],[22],[24] Institutions and practices constantly evolve in terms of surgical techniques and aseptic practices. Therefore, there is a possibility of a change in the incidence, the microbiology and antibiotic sensitivity patterns of postcataract endophthalmitis with time, and thus, there is a need for more recent reports. The incidence of postcataract in-house acute endophthalmitis in most recent 5 years (2010–2014) in 2 large eye care facilities was similar to that previously reported by these institutions.[18],[22] Importantly, the cumulative number of surgeries performed in this period was more than ½ million though the rates remained similar. There was no change in the incidence or microbiologic spectrum in a 5-year period except that there was a significant decline in fungal infection in these two institutions.

Cataract surgery is one of the most widely performed surgical procedures in the world including India. Given that India performs approximately 6 million cataract surgeries per year applying a very conservative estimate of 0.08% endophthalmitis rate will translate to over 4,800 cases of endophthalmitis every year in the hospitals, excluding possible sporadic cluster infection. From this perspective alone, the current literature is not representative of the national scenario. We suspect that since the reporting of the in-house endophthalmitis may be associated with stigma and negative publicity, there might be reluctance to publishing such reports. A well-designed national registry, such as the Intelligent Research In Sight [40] and participation may be considered as a national priority.

Similar social issues apply to reporting of cluster endophthalmitis. These clusters may behave like outliers and may dramatically increase the rates of endophthalmitis from a particular geographical location. The documentation of such events and appropriate root cause analysis help not only to tide over the immediate crisis but also prevent similar future mishaps. In the Indian context, certain groups have indeed identified the offending agents, and thus modified the practice.

We found a discrepancy in reporting standards between different reports. While a few reports combined clinical and culture proven cases, others have reported only culture proven cases. Using culture proven cases only may lead to under reporting of the true incidence unless the culture positivity for the said laboratory is more than 80%. We believe, it is best to report both scenarios. In view of the reports of primary fungal infection, it is necessary to include fungus culture in Indian microbiology laboratories, as is the current practice.

Reports of higher fungal infections in both North and East India was a surprise, so also one report of higher Nocardia infection from South India. However, we recognize that some of these were referred rather than in-house cases and hence may not actually represent the true postcataract surgery endophthalmitis microbiology spectrum in the community. While we need a larger series from North India, two publications from Chennai (South India) have reported a reduction in the incidence of fungal postcataract surgery endophthalmitis.[16],[29]

We found uniformity in the causative organism of cluster endophthalmitis. In two regions of the country - the Central and the South, Pseudomonas aeruginosa was the causative organism in nearly all instances. In addition, P. aeruginosa, be in cluster or isolated acute endophthalmitis was not as sensitive to ceftazidime as the EVS had reported.[15] This is a concern. Ceftazidime resistance has been reported from one center in South India.[41],[42] Hence, it is prudent to review the infection and antibiotic sensitivity profile every 5 years.

The weaknesses of this report are the absence of visual outcomes, risk factors assessment, and lack of uniformity in clinical and microbiology reports in all publications. The strength of the study was an analysis of all available reports.


  Conclusion Top


The incidence of postcataract surgery acute endophthalmitis in India is comparable to most of the developed world despite performing high volume cataract surgery. However, there is an urgent need for more reports from all institutes across different regions of India. A national registry with meticulous documentation of clinical and microbiology details will aid in developing region specific guidelines for the treatment and management of postcataract surgery endophthalmitis.

Financial support and sponsorship

Aravind Medical Research Foundation, Madurai and Hyderabad Eye Research Foundation, Hyderabad.

Conflicts of interest

There are no conflicts of interest.



 
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    Tables

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


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