1
|
Polat HK, Kurt N, Aytekin E, Bozdağ Pehlivan S, Çalış S. Novel Drug Delivery Systems to Improve the Treatment of Keratitis. J Ocul Pharmacol Ther 2022; 38:376-395. [PMID: 35763406 DOI: 10.1089/jop.2021.0127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Keratitis is a disease characterized by inflammation of the cornea caused by different pathogens. It can cause serious visual morbidity if not treated quickly. Depending on the pathogen causing keratitis, eye drops containing antibacterial, antifungal, or antiviral agents such as besiloxacin, moxifloxacin, ofloxacin, voriconazol, econazole, fluconazole, and acyclovir are used, and these drops need to be applied frequently due to their low bioavailability. Studies are carried out on formulations with extended residence time in the cornea and increased permeability. These formulations include various new drug delivery systems such as inserts, nanoparticles, liposomes, niosomes, cubosomes, microemulsions, in situ gels, contact lenses, nanostructured lipid carriers, carbon quantum dots, and microneedles. Ex vivo and in vivo studies with these formulations have shown that the residence time of the active substances in the cornea is prolonged, and their ocular bioavailability is increased. In addition, in vivo studies have shown that these formulations successfully treat keratitis. However, it has been observed that fluoroquinolones are used in most of the studies; similar drug delivery systems are generally preferred for antifungal drugs, and studies for viral and acanthameba keratitis are limited. There is a need for new studies on different types of keratitis and different drug active substances. At the same time, proving the efficacy of drug delivery systems, which give promising results in in vivo animal models, with clinical studies is of great importance for progress in the treatment of keratitis.
Collapse
Affiliation(s)
- Heybet Kerem Polat
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey.,Department of Pharmaceutical Technology, Faculty of Pharmacy, Erzincan Binali Yıldırım University, Erzincan, Turkey
| | - Nihat Kurt
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey.,Department of Pharmaceutical Technology, Faculty of Pharmacy, Tokat Gaziosmanpaşa University, Tokat, Turkey
| | - Eren Aytekin
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Sibel Bozdağ Pehlivan
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Sema Çalış
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| |
Collapse
|
2
|
Contact lenses coated with hybrid multifunctional ternary nanocoatings (Phytomolecule-coated ZnO nanoparticles:Gallic Acid:Tobramycin) for the treatment of bacterial and fungal keratitis. Acta Biomater 2021; 128:262-276. [PMID: 33866034 DOI: 10.1016/j.actbio.2021.04.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 03/24/2021] [Accepted: 04/07/2021] [Indexed: 12/13/2022]
Abstract
Contact lenses are widely used for visual corrections. However, while wearing contact lenses, eyes typically face discomforts (itching, irritation, burning, etc.) due to foreign object sensation, lack of oxygen permeability, and tear film disruption as opposed to a lack of wetting agents. Eyes are also prone to ocular infections such as bacterial keratitis (BK) and fungal keratitis (FK) and inflammatory events such as contact lens-related acute red eye (CLARE), contact lens peripheral ulcer (CLPU), and infiltrative keratitis (IK) caused by pathogenic bacterial and fungal strains that contaminate contact lenses. Therefore, a good design of contact lenses should adequately address the need for wetting, the supply of antioxidants, and antifouling and antimicrobial efficacy. Here, we developed multifunctional gallic acid (GA), phytomolecules-coated zinc oxide nanoparticles (ZN), and phytomolecules-coated zinc oxide nanoparticles + gallic acid + tobramycin (ZGT)-coated contact lenses using a sonochemical technique. The coated contact lenses exhibited significant antibacterial (>log10 5.60), antifungal, and antibiofilm performance against BK-causing multidrug resistant bacteria (Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia. coli) and FK-related pathogenic fungal strains (Candida albicans, Aspergillus fumigatus, and Fusarium solani). The gallic acid, tobramycin, and phytomolecules-coated zinc oxide nanoparticles have different functionalities (-OH, -NH2, -COOH, -COH, etc.) that enhanced wettability of the coated contact lenses as compared to that of uncoated ones and further enabled them to exhibit remarkable antifouling property by prohibiting adhesion of platelets and proteins. The coated contact lenses also showed significant antioxidant activity by scavenging DPPH and good cytocompatibility to human corneal epithelial cells and keratinocytes cell lines. STATEMENT OF SIGNIFICANCE: • Multifunctional coated lenses were developed with an efficient sonochemical approach. • Lens surface was modified with nanocoatings of ZnO nanoparticles, gallic acid, and tobramycin. • This synergistic combination endowed the lenses with remarkable antimicrobial activity. • Coated lenses also showed noteworthy antifouling and biofilm inhibition activities. • Coated lenses showed good antioxidant, biocompatibility, and wettability characteristics.
Collapse
|
3
|
Challenges in Acanthamoeba Keratitis: A Review. J Clin Med 2021; 10:jcm10050942. [PMID: 33804353 PMCID: PMC7957573 DOI: 10.3390/jcm10050942] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/15/2021] [Accepted: 02/17/2021] [Indexed: 02/07/2023] Open
Abstract
To review challenges in the diagnosis and management of Acanthamoeba keratitis (AK), along with prognostic factors, in order to help ophthalmologists avoid misdiagnosis, protracted treatment periods, and long-term negative sequelae, with an overarching goal of improving patient outcomes and quality of life, we examined AK studies published between January 1998 and December 2019. All manuscripts describing clinical manifestations, diagnosis, treatment, prognosis, and challenges in short- and long-term management were included. The diagnosis of AK is often challenging. An increased time between symptom onset and the initiation of appropriate therapy is associated with poorer visual outcomes. The timely initiation of standardized antiamoebic therapies improves visual outcomes, decreases the duration of treatment, and reduces the chances of needing surgical intervention. In clinical practice, AK diagnosis is often missed or delayed, leading to poorer final visual outcomes and a negative impact on patient morbidity and quality of life.
Collapse
|
4
|
Khan SA, Lee CS. Recent progress and strategies to develop antimicrobial contact lenses and lens cases for different types of microbial keratitis. Acta Biomater 2020; 113:101-118. [PMID: 32622052 DOI: 10.1016/j.actbio.2020.06.039] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 06/24/2020] [Accepted: 06/25/2020] [Indexed: 12/16/2022]
Abstract
Although contact lenses are widely used for vision correction, they are also the primary cause of a number of ocular diseases such as microbial keratitis (MK), etc. and inflammatory events such as infiltrative keratitis (IK), contact lens acute red eye (CLARE), contact lens-induced peripheral ulcer (CLPU), etc. These diseases and infiltrative events often result from microbial contamination of lens care solutions and lens cases that can be exacerbated by unsanitary lens care and extended lens wear. The treatment of microbial biofilms (MBs) on lens cases and contact lenses are complicated and challenging due to their resistance to conventional antimicrobial lens care solutions. More importantly, MK caused by MBs can lead to acute visual damage or even vision impairment. Therefore, the development of lens cases, lens care solutions, and contact lenses with effective antimicrobial performance against MK will contribute to the safe use of contact lenses. This review article summarizes and discusses different chemical approaches for the development of antimicrobial contact lenses and lens cases employing passive surface modifications, antimicrobial peptides, free-radical fabricating agents, quorum sensing quenchers, antibiotics, antifungal drugs and various metals and coatings with antimicrobial nanomaterials. The benefits and shortcomings of these approaches are assessed, and alternative solutions for future developments are discussed.
Collapse
Affiliation(s)
- Shakeel Ahmad Khan
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong.
| |
Collapse
|
5
|
Abstract
OBJECTIVE To report 2 cases of Acanthamoeba keratitis (AK) presenting with corneal endotheliitis. METHODS Case report. RESULTS Two contact lens wearers, who had been diagnosed with herpes simplex virus (HSV) keratitis, predominantly manifested corneal endotheliitis composed of corneal edema, keratic precipitates, and anterior chamber reaction at referral. AK was confirmed using cultures or through polymerase chain reaction testing. The patients were started on polyhexamethylene biguanide and responded favorably to regain satisfactory visual acuity. CONCLUSIONS Corneal endotheliitis, although uncommon, may be a manifestation of AK. We must have high-index suspicion for AK in all contact lens users, particularly before making a diagnosis of HSV keratitis. Accurate diagnosis and prompt treatment can result in a favorable prognosis for AK.
Collapse
|
6
|
Nateghi Pettersson M, Lagali N, Mortensen J, Jofré V, Fagerholm P. High fluence PACK-CXL as adjuvant treatment for advanced Acanthamoeba keratitis. Am J Ophthalmol Case Rep 2019; 15:100499. [PMID: 31312750 PMCID: PMC6609835 DOI: 10.1016/j.ajoc.2019.100499] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 06/11/2019] [Accepted: 06/18/2019] [Indexed: 11/13/2022] Open
Abstract
Purpose To describe the outcome of adjuvant high fluence photoactivated chromophore for infectious keratitis cross-linking (PACK-CXL) used to treat an advanced form of refractory Acanthamoeba keratitis (AK) diagnosed several months after initial presentation. Observations An otherwise healthy 24-year old female presented with a severe unilateral keratitis. The diagnosis eluded clinicians for several months and when finally confirmed as AK, anti-amoebic therapy was instated and only appeared to be effective after addition of high fluence PACK-CXL. Conclusion and importance In this case of advanced AK, high fluence PACK-CXL treatment given adjuvant to pharmacologic anti-amoebic therapy resulted in lasting pain relief, re-epithelization and eradication of the Acanthamoeba parasite. Given adjuvant to anti-amoebic pharmacotherapy, high fluence PACK-CXL might be a useful method for treating typically refractory advanced AK.
Collapse
Affiliation(s)
| | - Neil Lagali
- Department of Ophthalmology, Institute for Clinical and Experimental Medicine, Faculty of Medicine, Linköping University, 581 83, Linköping, Sweden
| | - Jes Mortensen
- Department of Ophthalmology, Ryhov County Hospital, 553 05, Jönköping, Sweden
| | - Victor Jofré
- Department of Ophthalmology, Ryhov County Hospital, 553 05, Jönköping, Sweden
| | - Per Fagerholm
- Department of Ophthalmology, Institute for Clinical and Experimental Medicine, Faculty of Medicine, Linköping University, 581 83, Linköping, Sweden
| |
Collapse
|
7
|
Szentmáry N, Daas L, Shi L, Laurik KL, Lepper S, Milioti G, Seitz B. Acanthamoeba keratitis - Clinical signs, differential diagnosis and treatment. J Curr Ophthalmol 2019; 31:16-23. [PMID: 30899841 PMCID: PMC6407156 DOI: 10.1016/j.joco.2018.09.008] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 09/10/2018] [Accepted: 09/26/2018] [Indexed: 01/21/2023] Open
Abstract
PURPOSE To summarize actual literature data on clinical signs, differential diagnosis, and treatment of acanthamoeba keratitis. METHODS Review of literature. RESULTS Clinical signs of acanthamoeba keratitis are in early stages grey-dirty epithelium, pseudodendritiformic epitheliopathy, perineuritis, multifocal stromal infiltrates, ring infiltrate and in later stages scleritis, iris atrophy, anterior synechiae, secondary glaucoma, mature cataract, and chorioretinitis. As conservative treatment, we use up to one year triple-topical therapy (polyhexamethylene-biguanide, propamidine-isethionate, neomycin). In therapy resistant cases, surgical treatment options such as corneal cryotherapy, amniotic membrane transplantation, riboflavin-UVA cross-linking, and penetrating keratoplasty are applied. CONCLUSION With early diagnosis and conservative or surgical treatment, acanthamoeba keratitis heals in most cases.
Collapse
Affiliation(s)
- Nóra Szentmáry
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
- Department of Ophthalmology, Semmelweis University, Budapest, Hungary
| | - Loay Daas
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
| | - Lei Shi
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
| | - Kornelia Lenke Laurik
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
| | - Sabine Lepper
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
| | - Georgia Milioti
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
| | - Berthold Seitz
- Department of Ophthalmology, Saarland University Medical Center, UKS, Homburg, Saar, Germany
| |
Collapse
|
8
|
McKelvie J, Alshiakhi M, Ziaei M, Patel DV, McGhee CNJ. The rising tide of Acanthamoeba keratitis in Auckland, New Zealand: a 7-year review of presentation, diagnosis and outcomes (2009-2016). Clin Exp Ophthalmol 2018; 46:600-607. [DOI: 10.1111/ceo.13166] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Revised: 01/01/2018] [Accepted: 01/08/2018] [Indexed: 11/27/2022]
Affiliation(s)
- James McKelvie
- The Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences; University of Auckland; Auckland New Zealand
- The Department of Ophthalmology; Greenlane Clinical Centre, Auckland District Health Board; Auckland New Zealand
| | - Moaz Alshiakhi
- The Department of Ophthalmology; Greenlane Clinical Centre, Auckland District Health Board; Auckland New Zealand
| | - Mohammed Ziaei
- The Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences; University of Auckland; Auckland New Zealand
- The Department of Ophthalmology; Greenlane Clinical Centre, Auckland District Health Board; Auckland New Zealand
| | - Dipika V Patel
- The Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences; University of Auckland; Auckland New Zealand
- The Department of Ophthalmology; Greenlane Clinical Centre, Auckland District Health Board; Auckland New Zealand
| | - Charles NJ McGhee
- The Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences; University of Auckland; Auckland New Zealand
- The Department of Ophthalmology; Greenlane Clinical Centre, Auckland District Health Board; Auckland New Zealand
| |
Collapse
|
9
|
Daas L, Szentmáry N, Eppig T, Langenbucher A, Hasenfus A, Roth M, Saeger M, Nölle B, Lippmann B, Böhringer D, Reinhard T, Kelbsch C, Messmer E, Pleyer U, Roters S, Zhivov A, Engelmann K, Schrecker J, Zumhagen L, Thieme H, Darawsha R, Meyer-Ter-Vehn T, Dick B, Görsch I, Hermel M, Kohlhaas M, Seitz B. [The German Acanthamoeba keratitis register: Initial results of a multicenter study]. Ophthalmologe 2016; 112:752-63. [PMID: 25833754 DOI: 10.1007/s00347-014-3225-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
BACKGROUND AND PURPOSE In September 2011 the cornea section of the German Ophthalmological Society (DOG) established the first German Acanthamoeba keratitis registry. The data of this multicenter survey are being collected, compiled and evaluated at the Department of Ophthalmology at the Saarland University. The aim of this article is to present an intermediate report. PATIENTS AND METHODS Data from 172 eyes with Acanthamoeba keratitis were collected during the last 10 years. For this interim report we actually evaluated 121 eyes (60.2 % female patients, average age 41.3 years) and collected the following data: date of onset of symptoms, date and method of diagnosis, initial diagnosis, anamnestic data, clinical symptoms and signs at diagnosis and during follow-up, conservative and surgical therapy. Criteria for inclusion in the Acanthamoeba registry was the established diagnosis of an Acanthamoeba keratitis with at least one of the methods described in this article. RESULTS Acanthamoeba keratitis could be histologically proven in 55.3 % of the cases, via PCR in 25.6 %, with confocal microscopy in 20.4 % and using in vitro cultivation in 15.5 %. Clinical symptoms and signs in Acanthamoeba keratitis were pain in 67.0 %, ring infiltrates in 53.4 %, pseudodendritiform epitheliopathy in 11.7 % and keratoneuritis in 5.8 %. In 47.6 % of the cases the initial diagnosis was herpes simplex virus keratitis followed by bacterial keratitis in 25.2 % and fungal keratitis in 3.9 %. Acanthamoeba keratitis was the correct initial diagnosis in only 23.2 % of cases. The average time period between first symptoms and diagnosis was 2.8 ± 4.0 months (range 0-23 months). A triple therapy with Brolene® Lavasept® and antibiotic eye drops at least 5 ×/day was used in 54.5 % of eyes (n = 66). Penetrating keratoplasty was performed in 40.4 %, in 18 cases in combination with cryotherapy of the cornea. The mean graft diameter was 7.9 ± 1.1 mm (range 3.5-11.0 mm). The final visual acuity (Snellen visual acuity chart at 5 m) was comparable in the two groups of eyes with (5/40 ± 5/25) and without (5/32 ± 5/25) keratoplasty. CONCLUSION Acanthamoeba keratitis is a rare and often very late diagnosed disease and two thirds of the cases were initially misdiagnosed. The early recognition of the typical symptoms is crucial for the prognosis of the disease. All ophthalmological departments in Germany are invited to submit further data of all confirmed cases (berthold.seitz@uks.eu), whether retrospectively or prospectively in order to generate an adequate standardized diagnostic and therapeutic approach for this potentially devastating disease.
Collapse
Affiliation(s)
- L Daas
- Klinik für Augenheilkunde, Universitätsklinikum des Saarlandes UKS, Kirrbergerstr. 100, 66424, Homburg/Saar, Deutschland.
| | - N Szentmáry
- Klinik für Augenheilkunde, Universitätsklinikum des Saarlandes UKS, Kirrbergerstr. 100, 66424, Homburg/Saar, Deutschland
| | - T Eppig
- Experimentelle Ophthalmologie, Universität des Saarlandes, Homburg/Saar, Deutschland
| | - A Langenbucher
- Experimentelle Ophthalmologie, Universität des Saarlandes, Homburg/Saar, Deutschland
| | - A Hasenfus
- Institut für Allgemeine und spezielle Pathologie, Universität des Saarlandes, Homburg/Saar, Deutschland
| | - M Roth
- Universitätsaugenklinik, Düsseldorf, Deutschland
| | - M Saeger
- Klinik für Ophthalmologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Kiel, Deutschland
| | - B Nölle
- Klinik für Ophthalmologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Kiel, Deutschland
| | - B Lippmann
- Klinik für Augenheilkunde, Universitätsklinikum Freiburg, Freiburg, Deutschland
| | - D Böhringer
- Klinik für Augenheilkunde, Universitätsklinikum Freiburg, Freiburg, Deutschland
| | - T Reinhard
- Klinik für Augenheilkunde, Universitätsklinikum Freiburg, Freiburg, Deutschland
| | - C Kelbsch
- Universitätsaugenklinik, Tübingen, Deutschland
| | - E Messmer
- Augenklinik der LMU, München, Deutschland
| | - U Pleyer
- Universitätsaugenklinik, Berlin Charité, Berlin, Deutschland
| | - S Roters
- Universitätsaugenklinik, Köln, Deutschland
| | - A Zhivov
- Universitätsaugenklinik, Rostock, Deutschland
| | | | | | - L Zumhagen
- Universitätsaugenklinik, Münster, Deutschland
| | - H Thieme
- Universitätsaugenklinik, Magdeburg, Deutschland
| | - R Darawsha
- Universitätsaugenklinik, Essen, Deutschland
| | | | - B Dick
- Universitätsaugenklinik, Bochum, Deutschland
| | - I Görsch
- Universitätsaugenklinik, Hamburg-Eppendorf, Deutschland
| | - M Hermel
- Universitätsaugenklinik, Aachen, Deutschland
| | - M Kohlhaas
- Augenklinik Dortmund, Dortmund, Deutschland
| | - B Seitz
- Klinik für Augenheilkunde, Universitätsklinikum des Saarlandes UKS, Kirrbergerstr. 100, 66424, Homburg/Saar, Deutschland
| |
Collapse
|
10
|
Roels D, De Craene S, Kestelyn P. Keratoneuritis is not pathognomonic of Acanthamoeba keratitis: a case report of Pseudomonas keratitis. Int Ophthalmol 2016; 37:257-258. [PMID: 27003712 DOI: 10.1007/s10792-014-0023-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Accepted: 11/28/2014] [Indexed: 11/25/2022]
Abstract
The presence of keratoneuritis in a radial pattern is considered to be a virtually pathognomonic sign of Acanthamoeba keratitis. We report a case of a massive keratoneuritis as a presenting sign in Pseudomonas keratitis in a contact lens wearer, thereby further challenging this concept.
Collapse
Affiliation(s)
- Dimitri Roels
- Department of Ophthalmology, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium
| | - Sophie De Craene
- Department of Ophthalmology, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium
| | - Philippe Kestelyn
- Department of Ophthalmology, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium.
| |
Collapse
|
11
|
Abstract
Pathogenic FLA are ubiquitous protozoans and despite frequent human contact remain a rare cause of often devastating infection with poor prognosis. Given changes in climate, human encroachment into the environment, increasing immunosuppression, and improving diagnostic capacity, it is likely we will see increased cases in the future. Early diagnosis is challenging but crucial to achieving a favourable outcome. It is best facilitated by improved awareness of FLA disease, appropriate clinical suspicion and early diagnostic testing.
Collapse
|
12
|
Robaei D, Carnt N, Minassian DC, Dart JK. Therapeutic and Optical Keratoplasty in the Management of Acanthamoeba Keratitis. Ophthalmology 2015; 122:17-24. [DOI: 10.1016/j.ophtha.2014.07.052] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 05/20/2014] [Accepted: 07/29/2014] [Indexed: 11/30/2022] Open
|
13
|
Patel DV, McGhee CN. Presumed late recurrence of Acanthamoeba keratitis exacerbated by exposure to topical corticosteroids. Oman J Ophthalmol 2014; 6:S40-2. [PMID: 24391372 PMCID: PMC3872843 DOI: 10.4103/0974-620x.122295] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A 28-year-old female with a history of contact lens wear presented with a 1 week history of pain and photophobia in her left eye. In vivo confocal microscopy (IVCM) and corneal scrape confirmed the diagnosis of Acanthamoeba keratitis (AK) which was treated with intensive topical propamidine isethionate (0.1%) and chlorhexidine (0.02%) with tapering dosage over 11 months. Five years after complete resolution of AK and cessation of all contact lens wear, the subject presented to her optometrist with a history of ocular discomfort and mild photophobia. Without further investigation she was prescribed topical corticosteroids. Three weeks later she presented with pain and reduced vision in the left eye. Slit-lamp examination revealed focal, inferior corneal stromal edema. IVCM confirmed widespread Acanthamoeba cysts. Treatment with topical polyhexamethylene biguanide (PHMB) 0.02% and propamidine isethionate 0.1% resulted in resolution of the AK. Despite an initially mild AK, this subject presumably retained viable Acanthamoeba cysts in her cornea 5 years after the initial episode. This report highlights the importance of caution when using corticosteroids in patients with a previous history of AK, even in the relatively distant past. Patients with AK should be warned regarding the risks of recurrence following presumed resolution.
Collapse
Affiliation(s)
- Dipika V Patel
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Charles Nj McGhee
- Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| |
Collapse
|
14
|
Szentmáry N, Daas L, Matoula P, Goebels S, Seitz B. Akanthamöbenkeratitis. Ophthalmologe 2013; 110:1203-10; quiz 1211. [DOI: 10.1007/s00347-013-2981-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
15
|
Robbie SJ, Vega FA, Tint NL, Hau S, Allan B. Perineural infiltrates in Pseudomonas keratitis. J Cataract Refract Surg 2013; 39:1764-7. [DOI: 10.1016/j.jcrs.2013.08.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 05/06/2013] [Indexed: 10/26/2022]
|
16
|
Lorenzo-Morales J, Martín-Navarro CM, López-Arencibia A, Arnalich-Montiel F, Piñero JE, Valladares B. Acanthamoeba keratitis: an emerging disease gathering importance worldwide? Trends Parasitol 2013; 29:181-7. [PMID: 23433689 DOI: 10.1016/j.pt.2013.01.006] [Citation(s) in RCA: 194] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 01/23/2013] [Accepted: 01/28/2013] [Indexed: 11/15/2022]
Abstract
Acanthamoeba keratitis (AK) is increasingly being recognized as a severe sight-threatening ocular infection worldwide. Although contact lens wear is the leading risk factor for AK, Acanthamoeba parasites are also an important cause of keratitis in non-contact lens wearers. Diagnosis of AK is challenging, and the available treatments are lengthy and not fully effective against all strains. The pathogenesis of Acanthamoeba is still under study, and the identification of the key factors involved in this process should be useful for the development of fully effective therapies. This review focuses on recent developments on AK pathogenesis and diagnosis as well as novel strategies for the evaluation of anti-amoebic agents that could be applied in the near future against these pathogens.
Collapse
Affiliation(s)
- Jacob Lorenzo-Morales
- University Institute of Tropical Diseases and Public Health of The Canary Islands, University of La Laguna, Avenida Astrofísico Francisco Sánchez SN, 38203 La Laguna, Tenerife, Canary Islands, Spain.
| | | | | | | | | | | |
Collapse
|
17
|
Utility of real-time polymerase chain reaction in diagnosing and treating acanthamoeba keratitis. Cornea 2011; 30:1233-7. [PMID: 21955634 DOI: 10.1097/ico.0b013e3182032196] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE Using real-time polymerase chain reaction (PCR), we detected Acanthamoeba and monitored the changes in Acanthamoeba DNA copy number over the treatment course in patients suspected of Acanthamoeba keratitis (AK). METHODS Subjects were 6 patients (average age, 26.2 years) suspected of AK at the Kinki University Outpatient Clinic. For detection of Acanthamoeba, patients' corneal scrapings were collected for smear analysis, culture, and real-time PCR. After the diagnosis of AK was confirmed, treatment was initiated based on the quantitative result of the real-time PCR. RESULTS Both the smear and culture were positive for Acanthamoeba in 4 cases and negative in 2 cases (agreement in 3 cases and disagreement in 2 cases). By real-time PCR, all 6 cases were positive for Acanthamoeba with an average DNA copy number of 4.8 ± 9.1 × 10 copies per sample. We further monitored the variation in the Acanthamoeba DNA copy number over the treatment course and successfully treated all the patients. DNA copy number provided a parallel with other clinical features of AK. CONCLUSIONS Real-time PCR can be a useful method for a rapid and precise diagnosis of AK. Moreover, utility of the Acanthamoeba DNA copy number obtained by real-time PCR can help ophthalmologists in making the best treatment decision.
Collapse
|
18
|
Patel DV, Rayner S, McGhee CNJ. Resurgence of Acanthamoeba keratitis in Auckland, New Zealand: a 7-year review of presentation and outcomes. Clin Exp Ophthalmol 2010; 38:15-20; quiz 87. [PMID: 20447096 DOI: 10.1111/j.1442-9071.2009.02182.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
PURPOSE To investigate the presentation, clinical characteristics and outcomes of Acanthamoeba keratitis (AK) in Auckland, New Zealand over a 7-year period. METHODS Retrospective analysis of all cases of AK treated by the tertiary corneal service at Auckland City Hospital/ University of Auckland Department of Ophthalmology (August 2001 to May 2008). Data were collected regarding age, gender, contact lens history, presenting signs and symptoms, diagnosis at first presentation, time to final diagnosis, identifiable risk factors, presenting and final visual acuity, results of microbiological testing, medical treatment, surgical interventions, recurrence of disease and length of follow up. All photographs and in vivo confocal microscopy images were reviewed. RESULTS Twenty-five eyes of 25 patients were identified with a diagnosis of AK (mean age 40 +/- 13 years). Ninety-six per cent were contact lens wearers. Mean time to diagnosis was 41 +/- 49 days (range 0-181 days, median 21 days). Fourteen patients (56%) had been treated with topical corticosteroids prior to the diagnosis. Early diagnosis of AK (<21 days) was associated with significantly better final visual acuity and did not require any surgical intervention compared with those diagnosed at a later stage. Six patients, all in the late diagnosis group, required surgical intervention. CONCLUSIONS AK has become significantly more common in New Zealand in the current decade. This study highlights the fundamental importance of early diagnosis and appropriate management in ensuring favourable outcomes. Practitioners should maintain a clinical suspicion of AK, especially as 96% of the subjects in this study were contact lens wearers.
Collapse
Affiliation(s)
- Dipika V Patel
- Department of Ophthalmology, New Zealand National Eye Centre, University of Auckland, New Zealand
| | | | | |
Collapse
|
19
|
Kong HH. Molecular phylogeny of acanthamoeba. THE KOREAN JOURNAL OF PARASITOLOGY 2010; 47 Suppl:S21-8. [PMID: 19885332 DOI: 10.3347/kjp.2009.47.s.s21] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 10/05/2009] [Accepted: 10/05/2009] [Indexed: 11/23/2022]
Abstract
After morphological grouping of Acanthamoeba by Pussard and Pons, phylogeny of the genus has been always a big topic to the researchers. Because of the variability of morphological characteristics, unchangeable and stable characters have been investigated for phylogenic criteria. Isoenzyme and mitochondrial DNA RFLP (Mt DNA RFLP) analyses revealed different patterns among strains assigned to a same species. Therefore, these characteristics would be considered as tools for strain discrimination than species identification. The most recently developed and the most promising method is the sequence analysis of 18s ribosomal RNA coding DNA (18s rDNA). The phylogenic tree based on comparison of 18s rDNA sequences distinguished the 3 morphological groups of Acanthamoeba and divided them into 12 unique sequence types (T1-T12 genotypes). Most clinical and environmental isolates belonged to the morphological group II and the genotype T4. In the Republic of Korea, 2 strains of Acanthamoeba, YM-2 and YM-3, were first isolated from the environment in 1974. However, phylogenic identification of Korean Acanthamoeba isolates from human infections or the environment were tried from the late 1990s. By RFLP analysis or total sequence analysis of 18s rDNA revealed that almost all clinical isolates including the one from a suspicious granulomatous amebic encephalitis patient belonged to the genotype T4. A large number of environmental isolates from contact lens storage cases, tapped water, and ocean sediments also belonged to the genotype T4. Almost identical strain characteristics, such as Mt DNA RFLP pattern of environmental isolates, with the clinical isolates could make a simple conclusion that most environmental isolates might be a potential keratopathogen.
Collapse
Affiliation(s)
- Hyun Hee Kong
- Department of Parasitology, Kyungpook National University School of Medicine, Daegu 700-422, Korea.
| |
Collapse
|
20
|
|
21
|
Darwinian evolution or (r)evolution: ophthalmology and ophthalmic journals in the 21st century. Clin Exp Ophthalmol 2009; 37:158-9. [DOI: 10.1111/j.1442-9071.2009.02008.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
22
|
|