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Background: Actinomycetomas are chronic, granulomatous, subcutaneous infections caused by actinomycetes bacteria. Despite prolonged high-dose and combination antibiotic therapies, some cases remain resistant with risks of bone and visceral involvement., Objectives: We sought to evaluate the efficacy and safety of imipenem monotherapy, and in combination with amikacin for the treatment of severe and refractory disease, and to identify the disease characteristics that might predict therapy failure with first-line sulfonamides., Methods: A retrospective study was performed of all microbiologically confirmed cases of actinomycetomas treated since 1995 at a tertiary center for mycology. Eleven patients (Nocardia, n = 10) were treated with sulfonamide combinations (trimethoprim/sulfamethoxazole and dapsone). Eight patients (Nocardia, n = 7) refractory to previous therapies including sulfonamides received a 3-week course of either parenteral imipenem monotherapy (1.5 g daily, n = 3) or combination therapy with amikacin (1 g daily, n = 5), which was repeated at 6-month intervals., Results: Eleven patients with limited disease and mean disease duration of 1.7 years responded successfully to sulfonamides after a mean treatment period of 15 months (range 6-48 months). Patients receiving imipenem had mean disease duration of 10 years, with visceral and bone involvement in 4 patients. Imipenem treatment was well tolerated, and 4 patients achieved clinical and microbiological cure after one to two courses of treatment, the others demonstrating greater than 75% clinical improvement and negative culture results., Limitations: Patient cohorts in this study were small because strict criteria for inclusion included species identification and adequate follow-up periods. The efficacy data for imipenem +/- amikacin therapy cannot be extrapolated to all Nocardia mycetomas, as the cohort treated in this study had particularly refractory infection., Conclusions: Sulfonamides are effective for limited disease of relatively short duration. Imipenem monotherapy or in combination with amikacin is well tolerated and demonstrates efficacy in severe disease refractory to sulfonamides., (Copyright (c) 2009 American Academy of Dermatology, Inc. Published by Mosby, Inc. All rights reserved.)

Mycetomas are chronic, granulomatous, subcutaneous infections caused by traumatic inoculation into the skin of either the actinomycetes bacteria or the eumycetes fungi, giving rise to actinomycetomas and eumycetomas, respectively. They are endemic in the tropics afflicting mainly those of low socio-economic status and men working in agriculture. The disease is slowly progressive and can cause bone involvement, which can result in considerable disability. Late presentation is not uncommon making them notoriously difficult to manage. This article highlights the important aspects of their management and developments in drug therapy.

Background: Mycetomas are chronic, granulomatous, subcutaneous infections caused by either actinomycetes bacteria or eumycetes fungi. The disease is endemic in the tropics and is characterised by a slow progression with risks of bone and visceral involvement. Therapy has consisted of prolonged courses of antibiotics or antifungals, often combined with surgery. The long treatment duration, poor therapy response and high rates of relapse have prompted trials of novel antibiotics and antifungals., Objective: The aim of this study was to describe recent advances and developments in the diagnosis, prognosis and treatment of mycetomas., Methods: An extensive review of the literature was conducted into all aspects of the management of mycetomas, with a particular focus on novel drug therapy regimes., Results/conclusion: There have been notable advances in improved molecular techniques for species identification. Carbapenems, oxazolidinones and triazoles have emerged as promising therapeutic options, but access to drug therapies in developing countries remains limited by the poor availability and high costs.