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Treatment of Acanthamoeba keratitis
1Cornea and External Disease Service, Virginia Mason Medical Center, Seattle, Washington 98111-0900, USA.
Purpose:
To review the available treatment modalities for Acanthamoeba keratitis and to assess the most effective regimens.
Methods:
The efficacy of therapeutic modalities and chemotherapeutic agents used in the treatment of Acanthamoeba keratitis was reviewed. Potential synergistic or additive drug interactions were documented both in vitro and in vivo.
Results:
Early diagnosis of Acanthamoeba keratitis plays a crucial role in successful medical treatment. The cationic antiseptic agents, chlorhexidine and polyhexamethylene biguanide (PHMB) have the lowest minimal amoebicidal concentrations. Synergistic effects are seen when used with pentamidine, and additive effects are seen with propamidine or neomycin. Penetrating keratoplasty should be deferred if at all possible until a medical cure has been achieved.
Conclusion:
Early diagnosis and wide epithelial debridement are important elements in the successful treatment of Acanthamoeba keratitis. Recommended therapy would include the cationic antiseptic agents, chlorhexidine or PHMB in combination with propamidine isethionate and neomycin as part of triple therapy. Surgical intervention should be avoided until a medical cure has been achieved.
Insights
Early diagnosis and prompt treatment are key for Acanthamoeba keratitis. Effective regimens combine cationic antiseptics like chlorhexidine or polyhexamethylene biguanide (PHMB) with other agents, avoiding surgery until medical cure.
Area of Science:
- Ophthalmology
- Infectious Diseases
- Microbiology
Background:
- Acanthamoeba keratitis (AK) is a severe microbial infection of the cornea.
- It can lead to significant visual impairment and is often associated with contact lens wear.
- Effective treatment strategies are crucial to prevent vision loss.
Purpose of the Study:
- To review current treatment options for Acanthamoeba keratitis.
- To evaluate the efficacy of various therapeutic agents and drug combinations.
- To identify the most effective treatment regimens for AK.
Main Methods:
- Systematic review of therapeutic modalities and chemotherapeutic agents for AK.
- Analysis of in vitro and in vivo data on drug interactions.
- Evaluation of clinical outcomes based on treatment approaches.
Main Results:
- Early diagnosis and epithelial debridement are critical for successful medical management.
- Cationic antiseptic agents, chlorhexidine and polyhexamethylene biguanide (PHMB), demonstrate the lowest minimal amoebicidal concentrations.
- Synergistic effects observed with pentamidine; additive effects with propamidine or neomycin.
Conclusions:
- Successful AK treatment relies on early diagnosis and prompt medical intervention.
- Recommended triple therapy includes chlorhexidine or PHMB combined with propamidine isethionate and neomycin.
- Surgical intervention, such as penetrating keratoplasty, should be postponed until a medical cure is achieved.
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