[Experience at preventing foot mycoses among replacements].
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In the last few years, there has been a continuous, marked increase in serious mycotic infections, with a high incidence of morbidity and mortality especially among patients undergoing surgery in Intensive Therapy Units. Many risk factors are associated with the development of mycotic infections, amongst which the following may be highlighted: immunosuppression, protracted antibiotic treatment, long NPT, serious trauma, central venous catheterization and, in critical patients, a high APACHE II score. Mycotic peritonitis, an increasingly rare complication found in patients undergoing peritoneal dialysis, seems to be linked to gastric or duodenal perforations treated late (> 24 h) or to secondary, chiefly post-operative peritonitis, in the case of anastomotic dehiscences or fistules, and more generally in surgical patients in unstable conditions, i.e. those with severe acute pancreatitis and cirrhotic imbalances. In the absence of clear clinical signs of mycotic infection, diagnosis is based on the positivity of the culture test carried out in all explorable sites (expectorate, urine, blood, drainage, ascites, intrabdominal sampling), while positivity of haemoculture alone is a real dilemma for the clinician as it may be the result of transitory fungemia or a widespread infection. As yet, there is no reliable diagnostic test, though histopathology, the general signs of sepsis and positive culture in normally sterile sites are used to provide clear indications. Until recently, most patients with intrabdominal infections were not treated with general antimycotics, both because of the relatively low probability of developing a systemic infection and the feared toxicity of amphotericine B. Nowadays, this wait-and-see approach has been discarded, such that high-risk patients are recommended early empirical antimycotic treatment or even prophylaxis. The choice of antimycotic agent, dosage and duration of therapy depends on the aetiologic agent isolated, on the source of infection, renal functionality and associated pathologies. In conclusion, while the incidence of serious mycotic infection has sharply increased, an appropriate therapeutic strategy has not yet been definitively identified, due both to the lack of numerically significant clinical studies and especially the extreme variability and complexity of patients to be treated.
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In order to know mycosis frequency in the North of the State of Puebla, Mexico, in habitants from the communities of Ayotoxco, Mazatepec and Zacatipan were studied. Previous medical study biological samples were submitted to direct examination, smear and culture. Histoplasmin and sporotrichin skin test were applied to 57 individual from Zacatipan. From 110 patients 146 mycological studies were performed. Eighty six cases (59%) of mycosis were detected: 43 finger or toenails onychomycosis, 25 tinea pedis, seven tinea capitis, four cases of tinea manum and, finally, five cases of seborrhoeic dermatitis and two of pitiriasis versicolor. We isolated: 18 streins of dermatophytes, mainly Trichophyton rubrum and T. mentagrophytes (11 and 5 strains respectively); 12 cultures of non-dermatophytes filamentous fungi; six cases of mycelia sterile; six yeast strains, most of them Candida spp but none C. albicans. From 57 patients to whom skin tests were applied, five of them (8.8%) were positive to both antigens; ten positive (17.6%) only to histoplasmin and eight (14%) to sporotrichin. This study showed that rural population from Puebla present a high frequency of superficial mycosis (61% of mycological studies). Considering the percentage of positive skin test we suppose that there are many not diagnosed sporotrichosis and histoplasmosis cases.
The 11th Focus on Fungal Infections meeting was held in Washington, D.C., U.S.A., March 1416, 2001. At the conference, there were well-attended sessions that focused on the pathogenesis and therapy of fungal disease. This report focuses on new information on fungal incidence and pathogenesis as well as on the in vitro and clinical experience of established antifungal drugs (fluconazole, itraconazole, amphotericin B, liposomal formulations of amphotericin B, terbinafine) and the newer antifungal compounds approved for use (e.g., caspofungin) and in development (the new-generation azoles: voriconazole, posaconazole, ravuconazole, and the candins, micafungin and anidulafungin).
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Systemic fungal infections are an important cause of morbidity and mortality among immunocompromised patients. New antifungal agents, such as triazoles, are now available, and the place of in vitro tests has to be discussed. It has been shown that interlaboratory reproducibility of in vitro susceptibility tests against fungi was low, due to the lack of standardization. Recently, the NCCLS defined conditions permitting a good interlaboratory reproducibility. However, the predictive value of in vitro susceptibility tests on the therapeutic outcome remain to be demonstrated, and is now under investigation. At the present time, susceptibility testing can be useful: in patients treated by amphotericin B for a severe fungal infection and who do not improve under therapy; to detect resistance to 5-fluorocytosine; to compare the sensitivity to triazoles before and after treatment, in case of therapeutic failure. Serum levels monitoring is useful to prevent the toxicity due to 5-fluorocytosine and to control the digestive absorption of triazoles, especially the lipophilic compound itraconazole.
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