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Biomedical subjects

N Lambert-Zechovsky

Publications and source records attributed to N Lambert-Zechovsky.

At least 91 records · Page 5Linked to original sources
PubMed1986

[Determination of aminoglycosides in the newborn infant. Significance and methods].

Monitoring of serum aminoglycosides is useful in neonates to ensure therapeutic efficacy and avoid toxicity. The choice of a method must take in count several informations: sample size, versatility, sensitivity, specificity, precision, rapidity, equipment requirements and reagent cost. Many methods are now available: Microbiological assay, Radioimmunoassay (RIA) techniques, Radioenzymatic assay (REA), "High Pressure" liquid chromatography (HPLC), Fluorescent immunoassay, Enzyme-Multiplied Immunoassay (EMIT) and Fluorescent polarization Immunoassay (FPIA). Microbiological assay is inexpensive but has major disadvantages: lack of specificity, low precision, requires 24 to 48 hours, large sample size. EMIT and FPIA are rapid, sensitive, highly specific and particularly adapted to the pediatric use but reagent are expensive.

Aminoglycosides↗
PubMed1985

Impact of cefotaxime on the fecal flora in children.

A differential quantitative analysis was used to study the effect of cefotaxime on the fecal flora in 26 hospitalized children ranging from two days to four years of age. Fecal specimens were obtained before, during and after therapy. This study was evaluated in comparison to 41 patients of the same age and from the same environment without antibiotic treatment or signs of infection. The fecal flora of the control group showed qualitative and quantitative stability. Two groups of species were distinguished: a group in which the upper limit was less than or equal to 10(7) bacteria/g of stool (Klebsiella, Enterobacter, other enterobacteria, Staphylococcus, Pseudomonas) and a group with less than or equal to 10(10) bacteria/g of stool (anaerobes, Escherichia coli, Streptococcus D). This stability of the control group of subjects allowed us to interpret the variations of microbial concentrations during and after cefotaxime treatment. In previous studies, we showed in the newborn a substantial risk of septicemia of intestinal origin when overgrowth occurred, especially with Klebsiella. With cefotaxime there was a decrease or a disappearance in 65% of E. coli and a slight decrease of Klebsiella and Enterobacter. This fact was of great interest in the treatment of endogenous secondary septicemia. We observed an appearance of Pseudomonas (nine Pseudomonas aeruginosa, two Pseudomonas putida, one Pseudomonas fluorescens) in 12 cases among the 26 children treated.(ABSTRACT TRUNCATED AT 250 WORDS)

Bacteria↗
PubMed1984

[Influence of amoxicillin combined with clavulanic acid on the fecal flora in children].

The effect of an amoxycillin-clavulanic acid combination on the intestinal bacterial ecosystem was studied by differential quantitative analysis of the fecal flora in 11 hospitalized pediatric patients aged 8 months to 4 years. The antibiotic combination was given orally to 7 patients and intravenously to 4. The modifications in the intestinal flora are more important with oral route than intravenous route. After treatment, an increase in ampicillin-resistant E. coli with overgrowth of Klebsiella were found. Our previous studies have shown that this microbial overgrowth carries a risk of secondary septicemia. A strain of amoxycillin-resistant Serratia marcescens emerged but did not pullulate . The other aerobic or anaerobic bacteria were not significantly modified. Most strains which emerged after therapy remained susceptible to the combination. Yeasts emerged in two patients. Thus, the amoxycillin-clavulanic acid combination results in intestinal Klebsiella overgrowth, requiring monitoring of the intestinal bacterial ecosystem.

Amoxicillin↗
PubMed1984

[Influence of cefoperazone on the fecal flora in children].

A differential quantitative study was used to evaluate the effects of parenteral cefoperazone upon children's fecal flora. Fecal specimens were obtained from 16 patients, before, during and after therapy. Cefoperazone therapy was associated with major changes in fecal flora. There was marked reduction or suppression to undetectable levels of Enterobacteria, Staphylococci and Streptococci in 13 patients. During therapy, yeasts were selected or acquired in 7 cases. 5 to 10 days after cefoperazone was discontinued, the fecal flora was virtually the same as before treatment. Thus, cefoperazone should prove very useful in the treatment of septicemia due to intestinal overgrowth.

Adolescent↗
PubMed1983

[Rapid diagnosis of pathogenic bacteria isolated from stool cultures by a standardized micromethod].

We evaluate a new and quick micromethod which detect strains of Salmonella, Shigella and Yersinia from suspected colonies isolated of stool specimens. In our study, from 2 384 non pathogen bacteria or as Salmonella. And we determined 297 strains of Salmonella, two hours after isolation on selective medium. This method is very easy and permits to have a rapid diagnostic of strains of Salmonella.

Bacteria↗
PubMed1983

Bacteriological analysis of jejunostomy fluid after surgery for extrahepatic biliary atresia.

Quantitative cultures were made of jejunostomy fluid from 22 children with extrahepatic biliary atresia following hepatoportoenterostomy. Bacterial flora characteristics did not differ in patients with or without cholangitis. With the exception of Streptococcus group D, the most frequently encountered bacterial species with the highest mean concentrations in the jejunostomy fluid, were those mostly responsible for cholangitis (Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa). In 19 of 22 acute episodes, the organism causing cholangitis identified in blood and/or liver was also isolated from jejunostomy fluid. However, quantitative determinations in this fluid did not permit reliable identification of this organism. When the same bacterium caused early relapse, it often persisted in the jejunostomy fluid.

Bacterial Infections↗