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Biomedical subjects

R Negroni

Publications and source records attributed to R Negroni.

At least 55 records · Page 3Linked to original sources
PubMed1987

[Comparative study of the efficiency of itraconazole and ketoconazole in the treatment of experimental paracoccidioidomycosis].

A comparative study between ketoconazole and itraconazole in the prophylactic and curative treatment of experimental paracoccidioidomycosis in rats and guinea pigs was carried out. Ninety seven Wistar rats were inoculated intracardiacally with the yeast-phase of P. brasiliensis with the purpose of evaluating the prophylactic treatment. Eighty one guinea pigs were injected intratesticularly with the same microorganism with the aim of studying the healing treatment. Both drugs were administered by gavage once a day. The prophylactic treatment started 3 days before the challenger inoculation and the healing treatment begun 10 days after the challenger inoculation. The animals were divided in four groups: I), control animals to which only the solvents of both drugs were administered; II), those which received ketoconazole 40 mg/kg/day; III), those treated with the same drug 80 mg/kg/day, and IV), animals treated with itraconazole 8 mg/kg/day. Seven to 30 days after starting the healing and prophylactic treatments the results were evaluated. Itraconazole seems to be as effective as ketoconazole at 5 fold lower dosage.

Animals↗
PubMed1987

[Chronic disseminated histoplasmosis as an opportunistic infection].

Sixty four patients suffering a chronic disseminated histoplasmosis were studied with the aim of fingind if they had predisposing factors. Thirty cases (46.8%) presented the following predisposing conditions: long treatment with low doses of corticosteroids in 7, ethilic hepatopathy in 7, diabetes in 4, lymphoma in 3, epitheliomas in 3, epitheliomas and diabetes in 1, renal insufficiency in 1, toxic hepatitis in 1, radiations in 1, long treatment with psychotropics in 1 and primary combined immunodeficiency in 1. Only slight differences were detected between these two groups of patients; those who exhibited predisposing factors presented an increased number of clinical localizations, altered cell mediated immunological tests were more frequent as well as the number of patients with multiple relapses and deaths. Histoplasmosis was not the cause of death in any case. It is possible that if a more frequent aggressive exploration, as hepatic biopsy, would be done a higher number of patients with predisposing factors would have been demonstrated.

Chronic Disease↗
PubMed1985

Treatment of superficial candidiasis with bifonazole 1% gel.

Sixty-one patients with superficial candidiasis, confirmed on entry by clinical examination and mycological culture, were treated with a single daily application of a 1% bifonazole gel over a period of 4 weeks. Patients were seen every week during treatment and then followed-up for 2 weeks. An overall assessment of response to treatment, based on the clinical and mycological culture findings at the 14-day follow-up visit, showed that the results were very good in 49 and moderate in 9 patients, with only 3 patients being considered as failing to respond. Local tolerance was very good, but burning was reported by 1 patient, burning and itching by 1, and ardor and irritation by one. All these side-effects occurred at the start of treatment and they subsided without interruption of bifonazole treatment.

Adolescent↗
PubMed1985

Treatment of tinea corporis or tinea cruris with bifonazole 1% gel: an open, multicentre study.

An open, multicentre study was carried out in 103 patients with confirmed dermatophyte infections (tinea cruris or tinea corporis). The fungi isolated were Tr. rubrum (45), Tr. mentagrophytes (11), Ep. floccosum (26) and M. canis (21). All patients were treated with a single daily application of bifonazole (1% gel) and the duration of treatment was 3 weeks. Weekly clinical controls were performed during the therapeutic period and at least two clinical and mycological examinations were given after the end of treatment. Treatment was evaluated according to the clinical and mycological findings at the 14th post-therapeutic day. The results obtained were classified as very good in 80 patients, good in 11, moderate in 11 and failure in 1 patient. Local tolerance was very good and no side-effects were observed in any patients.

Adolescent↗
PubMed1985

An open, multicentre assessment of the effectiveness of bifonazole in the treatment of tinea (pityriasis) versicolor.

One hundred and twenty-one patients with tinea (pityriasis) versicolor, confirmed by pretherapeutic clinical and mycological examination, were treated with a single daily application of bifonazole (BAY h 4502) 1% gel for 2 weeks. Weekly clinical controls were performed during the treatment period and at least two clinical and mycological post-therapeutic controls were given. Overall results were very good in 98 patients, good in 15, moderate in 7 and failure in 1 patient. Local tolerance was very good; only 1 patient presented with slight erythema and pruritus during the treatment.

Adolescent↗
PubMed1984

Treatment of tinea pedis interdigitalis with bifonazole, 1% gel.

329 adult patients with tinea pedis interdigitalis, which clinical diagnosis was confirmed by positive direct microscopic examinations and cultures of organisms from the lesions, were enrolled in this open and multicentric study. Informed consent was requested and obtained in each case. The bifonazole, 1% gel, tested was applied topically once daily for 3 weeks. Weekly clinical controls were performed during the treatment period and, at least, two clinical mycological posttreatment assessments were carried out. The evaluation criteria were based on the clinical and mycological findings at the end of the second posttreatment week. According to these criteria, the results obtained were: very good (clinical cure, negative mycology) 276 (84.0%); good (clinical improvement, negative mycology) 32 (9.5%); moderate (clinical improvement, positive mycology) 20 (6.0%), and failure (no clinical and mycological changes) 1 (0.5%). Tolerance was excellent, side effects were not observed in any case.

Adolescent↗
PubMed1984

Prophylaxis of tinea pedis interdigitalis with bifonazole, 1% powder.

With the objectives of determining the effectiveness of bifonazole 1% powder in the prophylactic treatment of tinea pedis interdigitalis and its local tolerance, 200 patients who achieved clinical and mycological cure in another previous trial with bifonazole 1% gel, and who were also reliable in the compliance of the treatment, were included in this study. Informed consent was requested and obtained in each case. This was a multicenter, double-blind, controlled and comparative study of one group (100 patients) treated with bifonazole verum against another group (100 patients) treated with bifonazole placebo. The allocation to each group was performed by randomization. Bifonazole was applied once daily in the morning on both feet, after showering, and inside shoes; patients applied it again when changing shoes or socks during the day. Treatment lasted up to 6 months. During the treatment, patients were clinically and mycologically assessed once a month and, if it was necessary, when signs and/or symptoms of infection reappeared. The evaluation criteria were based on the reinfection, clinically and mycologically demonstrable, during the treatment. 29 patients abandoned the treatment. Reinfection was observed in 57 out of the 171 patients who finished the treatment, 47 reinfections occurred in the placebo group and the remaining 10 in the verum group. Tolerance was excellent, no side effects were observed in any patient.

Adult↗
PubMed1981

Ultrastructural changes produced by ketoconazole in the yeast-like phase of Paracoccidioides brasiliensis and Histoplasma capsulatum.

The ultrastructural changes produced by ketoconazole in the yeast-phase of H. capsulatum and P. brasiliensis were studied by means of scanning and transmission electron microscopy. The observed alterations on both fungi were very similar to those induced by the same drug on the ultrastructure of C. albicans. These alterations include surface changes, abnormal membrane proliferation, fatty degeneration of the cytoplasm and lysis of the subcellular organelles. P. brasiliensis seems to be more sensitive to ketoconazole than H. capsulatum, since the necrosis of most of the cells was obtained in the former at a concentration of 0.1 microgram/ml and in the latter at 1 microgram/ml.

Cell Membrane↗
PubMed1979

Bacterial allergy in allergic rhinitis and bronchial asthma.

Nineteen patients suffering from allergic rhinitis and bronchial asthma were studied for bacterial allergy with Staphylococcus aureus, Kelbsiella pneumoniae and Diplococcus pneumoniae. Allergy skin tests, provocative tests and the Migratory Inhibition Factor were employed. The correlation indicates to the authors that bacterial allergy is more important than bacterial "infection" as a cause of allergic rhinitis and asthma in many instances. This is often overlooked by practicing allergists.

Antigens, Bacterial↗
PubMed1979

[Therapy of opportunistic mycoses].

The author presents the drugs that are available for the treatment of opportunistic mycoses: amphotericin B, nystatin, 5-fluorocytosine, miconazole and the newest imidazole derivative econazole. He presents his experience with econazole in 4 cases with deep mycoses. He speaks of the mode of application and the therapeutical limits of these products as well as of the favorable factors and the prophylactic measures to be taken.

Adult↗
PubMed1979

[Study of yeast phase Histoplasma capsulatum antigens used for skin tests].

The results of skin tests with two antigens of the yeast phase of Histoplasma capsulatum are presented. Both antigens were able to fix complement and form precipitating bands in the presence of sera from patients with active histoplasmosis. Their sensitivity was lower than the metabolic antigen usually employed in serology. Results of skin tests obtained with both yeast phase antigens and a standard histoplasmin coincided in animals infected with H. capsulatum. Only one cross reaction was observed in animals inoculated with Paracoccidioides brasiliensis. Skin tests in humans were conducted on patients with and without mycotic disease. The percentages of positive reactions in patients with histoplasmosis were not significantly different between control histoplasmin and whole cell extracts. In the patients with non mycotic diseases the frequency of positive tests varied between 28.8% and 32%, which agrees with previous statistical data for the general population of the area. Equally the positive percentage of 55% and 68% in patients with paracoccidioidomycosis coincided with the results of previous studies. The histological patterns of these skin tests showed that they were produced by cell mediated hypersensitivity. The sensitivity of a whole yeast cell extract was similar to histoplasmin L48, but its preparation was quicker and easier to perform and it had no foreign substances from the culture medium, so we think that it would be easier to standardize it chemically.

Animals↗
PubMed1977

Results of miconazole therapy in twenty-eight patients with paracoccidioidomycosis (South American blastomycosis).

Results are presented of treatment with miconazole, orally and intravenously, in patients with paracoccidioidomycosis. Twenty-eight male patients aged from 34 to 66 years and exhibiting various clinical forms of the disease were studied. Twenty-five came from endemic areas in north east Argentina (Chaco, Formosa, Misiones, Corrientes and northern Santa Fe) and the remaining three from Paraguay. Twenty patients were engaged in agricultural work or at woodmills. single or multiple lesions were observed in 24 cases. Thirteen were suffering from infection of the larynx and in two of them a tracheotomy was necessary. Twenty-three showed pulmonary lesions on X-rays. Twelve had ganglionic lesions, eight had cutaneous lesions and one patient had osteoarthritis of the knee. One patient had hepatomegaly which was unrelated to chronic alcoholism. Fourteen patients had received previous treatments such as sulphonamides and amphotericin B (7 cases); sulphonamides (3), sulphonamides and the combination sulfamethoxazole + trimethoprim (3), and one patient had received all three medications. All patients had relapsed before starting miconazole therapy. Diagnosis was established by the presence of P. brasiliensis in all cases, recovered either from cutaneous or mucosal biopsy samples or from the sputum. Complement fixation tests were positive in all patients at the onset of the treatment and the immunodiffusion reactions showed precipitation bands in 27/28 patients. Skin tests with P. brasiliensis antigens proved to be positive in 18 cases and negative in 10. The erythrocyte sedimentation rate was markedly accelerated in 22 patients (greater than 20 mm in the first hour).(ABSTRACT TRUNCATED AT 250 WORDS)

Administration, Oral↗