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Biomedical subjects

C Baudoin

Publications and source records attributed to C Baudoin.

68 records · Page 4Linked to original sources
PubMed1990

Inhibition by serum components of the expression of lipoprotein lipase gene upon stimulation by growth hormone.

Growth hormone regulates in a positive way the expression of the lipoprotein lipase gene at a transcriptional level in preadipocyte Ob1771 cells. Inhibition by serum components of this expression was investigated upon stimulation by growth hormone. Low-molecular weight, lipid-soluble components (a serum lipid extract, corticosteroids and oleic acid) and high-molecular weight, hydrophilic components (TGF-beta and those present in delipidated serum) were inhibitory. Inhibition of the expression of LPL mRNAs and that of LPL activity were parallel. It is concluded that the regulation of the expression of LPL gene occurs likely at a transcriptional level and that a balance between multiple effectors present in serum are active in an opposite manner.

Animals↗
PubMed1986

Efficacy of endonasal neomycin-tixocortol pivalate irrigation in the treatment of chronic allergic and bacterial sinusitis.

60 patients, aged 15-51 years, with chronic allergic or bacterial maxillary sinusitis, were entered in a controlled, double-blind study comparing the efficacy of endonasal irrigations of tixocortol pivalate (Pivalone)-neomycin and neomycin. The treatment lasted 11 days and was administered once daily. A ventilometric measurement of sinus pressure was performed every two endonasal irrigations to assess treatment efficacy. The percentage of nasal deobstruction was significantly higher with tixocortol pivalate-neomycin than with neomycin alone by the fifth examination (9th day) regardless of the etiology of the sinusitis (allergic or bacterial). After 11 days of treatment, significantly better results were obtained in cases of bacterial sinusitis (94% deobstruction with tixocortol pivalate-neomycin versus 74% with neomycin) than in cases of allergic sinusitis (69% deobstruction with tixocortol pivalate-neomycin versus 36% with neomycin).

Administration, Intranasal↗
PubMed1983

Quantitative evaluation of fluorescein angiograms: microaneurysm counts.

This study describes a method for quantifying microaneurysms (MA) from fluorescein angiograms. The method was validated by the reproducibility of the number of MA in 30 angiograms read twice each by two independent observers; and by the absolute difference in MA counts between two readings by the same observer, and difference in numbers counted by two different observers. The precise location of each MA on two readings was also studied and the reproducibility of location varied from 60 to 71%, depending on the quality of the angiograms. Clinicians and technicians working in the same or in different centers obtained similar results. The coefficient of correlation between observers and between readings was satisfactory, r greater than 0.9. The method is easy to learn and the reproducibility allows for its use in clinical trials.

Aneurysm↗
PubMedDate not supplied

Olfactory memory in rats, cholinergic agents and benzodiazepine receptor ligands.

Drugs and their effects on olfactory learning processes in rats were tested using a modified version of the runway apparatus developed by Ades. Rats were first exposed to a conspecific urine sample and 24 h later were exposed to the same stimulus in the runway. Observations recorded the time spent investigating the urine and the number of sniffs at the site, these being considered to be indices of memory. Diazepam-treated rats (4 or 6 mg/kg) and scopolamine-treated rats (0.5 or 1 mg/kg) showed increases for both parameters. When both drugs were administered simultaneously, the impairing effect was potentiated. However, no changes in learning responses were observed in rats treated with physostigmine (0.125, 0.25, 0.5 mg/kg) or methyl beta-carboline-3-carboxylate (0.3, 0.5, 1 mg/kg), although the administration of physostigmine or methyl beta-carboline-3-carboxylate was shown to antagonize the impairing effect of diazepam or scopolamine respectively. These observations support the hypothesis of interactions existing between cholinergic agents and benzodiazepine receptor ligands and of such interactions affecting olfactory acquisition processes. The runway apparatus appears to be a valid candidate model to be used for the assessment of pharmacological influences on olfactory learning in rats.

Animals↗
PubMedDate not supplied

Pharmacokinetics of aztreonam in patients with chronic renal failure.

The elimination kinetics of aztreonam (SQ 26,776), a new, completely synthetic, monocyclic beta-lactam antibiotic, were studied after the administration of a single 1g intravenous dose. Five healthy volunteers and 20 patients with various degrees of renal insufficiency were enrolled in this study. Concentrations of aztreonam in serum and urine were determined by both microbiological and high pressure liquid chromatography (HPLC) assays. The pharmacokinetic parameters for aztreonam were calculated on the basis of a 2-compartment open model. Serum concentrations of aztreonam at 10 minutes after administration were approximately 100 micrograms/ml in all subjects, regardless of renal function (HPLC assay). The mean serum half-life during the alpha-phase showed no important variation with renal function. The mean serum half-life during the beta-phase was 1.8 hours in normal subjects and 8.4 hours in haemodialysis patients (HPLC assay). There was a linear correlation between the serum clearance of aztreonam and creatinine clearance. The mean cumulative urinary recovery of aztreonam in 48 hours was 60 to 70% of the administered dose in normal subjects but this was reduced in the presence of renal insufficiency. SQ 26,992, the microbiologically inactive metabolite of aztreonam resulting from hydrolytic opening of the beta-lactam ring, was undetectable in the serum of normal subjects but was found in low levels in uraemic patients. Half of a 1g intravenous dose of aztreonam was eliminated during 4 hours of haemodialysis. Guidelines for administration of aztreonam in the presence of renal failure are given.

Adult↗
PubMedDate not supplied

[The first case of distomatosis in Upper Volta].

Distomatosis was not reported in Upper-Volta before this first case described in Bobo-Dioulasso. However this disease becomes more frequent in West Africa. Exact parasitologic diagnosis was impossible between Paragonimus and Poïchilorchis congolensis with the clinical, anatomical data of this first observation.

Adolescent↗
PubMedDate not supplied

[Effects of loperamide on fecal electrolyte excretion in acute diarrhea in infants].

The effect of loperamide (Imodium) on fecal excretion of electrolytes was studied using a double-blind protocol in 63 infants aged 1 to 32 months, presenting with acute diarrhea. The etiology of these infections was due to virus (n = 9), E. coli (n = 4), Salmonella (n = 4), Shigella (n = 2) or was of undetermined origin (n = 34). The therapeutic protocol was the same for all the infants: ad libitum oral rehydration, with no drug being administered except for Imodium at an average dose of 20 to 25 drops/kg/24 h (0.16 to 0.20 mg/kg/24 h), given every 8 hours for at least 48 hours. Stool Na+ and K+ concentrations were determined in samples taken before and after the double-blind trial. In patients receiving loperamide, we observed a non-significant decrease in fecal Na+ concentration as compared with values before treatment. Comparison of the two groups of infants, one receiving Imodium, the other a placebo, showed a significant difference (p less than 1%) in fecal sodium concentration, due rather to an increase in stool Na+ in the placebo group than to a decrease in the group treated with Imodium. Moreover, the use of loperamide, compared with the placebo, did not result in a significant decrease in the number of stools, modified fecal K+ values, or more rapid recovery from the diarrheal syndrome.

Acute Disease↗