Navegando por Assunto "Itraconazol"

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Acesso aberto (Open Access)
Avaliação da suscetibilidade in vitro de Fonsecaea spp a diferentes antifúngicos e análise das concentrações plasmáticas de itraconazol e hidroxiitraconazol em pacientes com cromoblastomicose na região amazônica
(Universidade Federal do Pará, 2015-06-18) GRISÓLIA, Daniella Paternostro de Araújo; SALGADO, Claudio Guedes; http://lattes.cnpq.br/2310734509396125
Chromoblastomycosis (CBM) is a fungal infection by implantation in the skin, with a chronic evolution, caused by traumatic inoculation of dematiaceous fungi. Pará state is one of the most important endemic areas in Brazil, and F. pedrosoi is the most prevalent agent. The low cure rate is consequence of the lack of a standardized treatment regimen and there are a few works related to susceptibility of black fungi to the drugs available for treatment. The main objective of this study was to evaluate in vitro susceptibility of clinical isolates of Fonsecaea spp. against nine antifungals, correlating itraconazole (ITZ) minimal inhibitory concentrations (MIC) and minimal fungicidal concentrations (MFC) with clinical outcome and the types of lesions. Furthermore, plasma levels of ITZ and ITZOH were measured in patients treated in Dr Marcello Candia Reference Unit in Sanitary Dermatology (UREMC, Pará State). Thirty-eight clinical isolates of Fonsecaea spp. were evaluated against ITZ, ketoconazole (CTZ), posaconazole (PCZ), voriconazole (VCZ), fluconazole (FCZ), amphotericin B (ANF B), caspofungin (CAS), terbinafine (TBF) and 5-fluorocytosine (5-FLU), according to the protocol of the Clinical and Laboratory Standards Institute (CLSI, M38-A2 document). After 5 days of incubation at 30°C, MICs were determined visually evaluating fungal growth in different drug concentrations, in comparison to the drug-free control wells. PCZ was the most effective (MIC 0.28 μg/ml, MFC 4.35 μg/ml) drug. The correlation between the MIC to ITZ and clinical outcome results demonstrate that patients with worsening had a media value ± SEM (0.90 ± 0.10 μg/ml) superior to no improvement (0.45 ± 0.05 μg/ml) or improvement (0.59 ± 0.05 μg/ml) and cure (0.45 ± 0.05 μg/ml), with a significant difference (p < 0.05) among the groups. There was no correlation between ITZ CIM and types of lesions. We observed a large inter-individual variability of ITZ and ITZOH plasma levels. ITZOH was up to 3 times higher in the plasma of patients (p < 0.001), which can contribute to the antifungal treatment and suggests an important participation of this metabolite in therapy. Lastly, we evaluated three patients who underwent high dose 600 mg/day ITZ with a significant increase of ITZOH (p= 0.0148) plasma levels. In summary, our data 1) confirmed F. pedrosoi as the main agent of CBM in Pará; 2) did not show correlation between the lesions, species and ITZ sensitivity; 3) Showed that ITZ, VCZ and PCZ are the drugs with lower CIM, wherein PCZ had the lowest MFC; 4) correlated the metabolite ITZOH with the clinical evolution of patients and; 5) indicated that the use of high doses of up to 600 mg/day ITZ can be used in patients who do not respond to lower therapeutic doses.
Acesso aberto (Open Access)
Determinação das concentrações plasmáticas e teciduais de itraconazol em pacientes com cromoblastomicose
(Universidade Federal do Pará, 2008-09-01) GRISÓLIA, Daniella Paternostro de Araújo; VIEIRA, José Luiz Fernandes; http://lattes.cnpq.br/2739079559531098
Chromoblastomycosis is a subcutaneous mycosis caused by deployment transcutaneous of several species of dematiaceous fungi, that is, melanized fungi. Considering the incidence of this disease in the state of Pará and the resulting morbidity of patients affected, with economic and social repercussions, it was made to the optimization of therapeutic schemes adopted, to the best knowledge of the relation dose x response. The itraconazole is one of the few drugs available for treatment, which has marked variability kinetic intra and inter individual, which compromises the establishment of the relation dose and response, as well as tissue and plasma concentrations achieved. In this sense, this work aimed at validation of analytical methodology by High Performance Liquid Chromatography and subsequent determination of itraconazole in samples of plasma and tissue in 20 patients with chromoblastomycosis, assisted in the laboratory of dermatoimmunology Dr. Marcello Candia, Marituba, Pará, who used the drug in doses of 200mg/day and 400mg/day. The technique employed was validated and proved adequate results in accordance with applicable law. Concentrations of plasma and tissue of itraconazole in the dose of 200mg/day were 121.3 87.9 ng/mL and 5.36 5.9 μg/g. The average plasma concentration of itraconazole in patients using 400mg/day was 290 234 ng/mL, and the plasma and tissue mean concentrations of itraconazole in patients who showed no clinical favourable, at doses of 200mg, making it necessary to increase to 400mg were 217 216 and 304 173 ng/mL; 14.87 12.94 e 21.80 6.62 μg/g. The average of relation between tissue and plasma concentrations in patients who had positive developments in clinical in the doses of 200mg/day was 44.29 67.12 and those that did not show positive developments in clinical in the doses of 200mg/day, making necessary to increase to 400mg/day were 68.52 59.90 and 71.71 38.26 respectively.