Search PubMed⌕ Search

Biomedical subjects

C Regamey

Publications and source records attributed to C Regamey.

89 records · Page 5Linked to original sources
PubMed1973

Synergism of carbenicillin and gentamicin against enterococci.

Carbenicillin and gentamicin were tested for synergism against 25 strains of enterococci by two different methods. Killing curves were determined by doing serial colony counts of broth cultures containing the antibiotics separately and in combination. The combination was synergistic for all 25 strains with 75 and 4 mug of carbenicillin and gentamicin per ml, respectively. Reducing the concentrations to 50 and 3 mug of the antibiotics per ml with four strains significantly reduced the rate of killing of the combination. Synergism was also studied by constructing isobolograms, by using the standard two-dimensional broth dilution checker-board technique, and by measuring the end points both for minimal inhibitory concentrations (MICs) and minimal bactericidal concentrations (MBCs). Synergism was present for all 25 strains when bactericidal end points (MBCs) were evaluated, but was present for only 7 of the 25 strains when MICs were used to construct isobolograms. The time and effort involved were roughly the same for killing curves and for isobolograms, and it was concluded that neither had a distinct advantage over the other.

Bacteria↗
PubMed1973

Pharmacokinetics of cephanone in healthy adult volunteers.

Five volunteers received intramuscular injections of 7 mg (approximately 500 mg) of cephanone, a new cephalosporin for parenteral use per kg. Peak serum concentrations averaged 36 mug/ml, about four times as high as with the same doses of cephalothin, twice as high as with cephaloridine, and slightly lower than with cefazolin. With a constant intravenous infusion of 100 mg/h, a steady-state serum concentration of 31 mug/ml was attained in four volunteers. The serum half-life was similar for the intramuscular and intravenous studies, 2.4 and 2.6 h, respectively. Over 90% of the dose administered was recovered in the urine. The factor mainly responsible for the higher and more sustained serum concentrations of cephanone was its low renal clearance of 47 ml per min per 1.73 m(2). Cephanone has a small apparent volume of distribution, probably related to its high serum protein binding of 88%.

Adult↗
PubMed1972

Inhibitory effect of heparin on gentamicin concentrations in blood.

In monitoring gentamicin concentrations in the blood of patients with renal insufficiency, the assayed antibiotic concentration was found to be lower when the sample was drawn as heparinized plasma rather than as serum. This lowering of gentamicin concentrations by heparin was studied further by adding increasing doses of heparin and various amounts of gentamicin to human serum. With a range of 2 to 100 units of heparin per ml, gentamicin concentrations in the serum were lowered by 9 to 14%; with higher heparin concentrations, an even greater and increasing inhibition was noticed, reaching 56% for 1,000 units/ml. This inhibitory effect of heparin on gentamicin was reversible by dilution, indicating that it was not due to degradation or to formation of an inactive chemical complex. Underestimation by the laboratory of gentamicin concentrations in blood is likely to be greatest with capillary tubes, with which the concentration of heparin is especially high. With clinical heparinization, the amount of active heparin in the blood does not exceed 10 units/ml and is for the most part under 3 units/ml; thus, therapeutically significant inhibition of the antibiotic is unlikely in patients receiving anticoagulation.

Gentamicins↗
PubMed1972

Comparative clinical pharmacology of amoxicillin and ampicillin administered orally.

Ampicillin and amoxicillin (alpha-amino-p-hydroxybenzyl penicillin) were administered orally in 500-mg doses to eight fasting volunteers in a comparative study in which pharmacokinetic techniques were used. The absorption of amoxicillin was significantly better, as demonstrated by a higher mean peak serum concentration of 7.6 mug/ml as compared to 3.2 mug/ml for ampicillin, an average "area under the curve" that was approximately double that of ampicillin, and an 8-hr urinary recovery for amoxicillin of 60% as compared to 34% for ampicillin. Serum half-lives were the same for the two antibiotics, with values of 60.3 (+/-3.3) min for ampicillin and 61.3 (+/-5.6) min for amoxicillin. The latter drug gave measurable concentrations in the blood at 8 hr in all of eight volunteers, as compared to only three of eight with ampicillin.

Administration, Oral↗
PubMed1972

Serum protein binding of the aminoglycoside antibiotics.

The binding of four aminoglycoside antibiotics by human serum was investigated under controlled conditions of physiological pH and temperature, by means of an ultrafiltration technique. No serum binding was demonstrable for gentamicin, tobramycin, or kanamycin, whereas streptomycin was 35% bound. Previous conflicting studies are discussed, and some of the pharmacological implications are considered.

Aminoglycosides↗
PubMedDate not supplied

Initial treatment of sepsis in non-neutropenic patients: ceftazidime alone versus 'best guess' combined antibiotic therapy.

We conducted a prospective, randomized, multicentric study in community hospitals. Patients with clinical sepsis, rectal temperature > or = 38 degrees C and pulse rate > or = 100 bpm were randomized to receive ceftazidime (group CAZ) or a combination of antibiotics freely chosen by the clinician following his 'best guess' (group COMB). On specified grounds, the clinician could also treat patients in an open group with a free combination of antibiotics (group OPEN). The severity of disease at study admission was assessed by a clinical estimation and an Apache II score. There were 128 patients included: 56 randomized in group CAZ, 50 in group COMB, and 22 in the OPEN group. Ninety-one patients were evaluable: 41 in group CAZ, 30 in group COMB, 20 in OPEN group. At the end of the period of empirical treatment (48-72 h), the clinical success rates (improvement of status) were 93, 93 and 75% (p for group OPEN vs. groups CAZ or COMB: 0.10). The bacteriological success rates (sterile blood cultures) were 91, 88 and 80% (p not significant). mean Apache II score was 16.7 and the score correlated significantly with outcome, as did clinical evaluation. In conclusion, ceftazidime alone was a safe antibiotic therapy in this study and we could not demonstrate a superiority of a combined antibiotic therapy chosen by the clinician following his 'best guess' over ceftazidime.

APACHE↗