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Biomedical subjects

G Bühler

Publications and source records attributed to G Bühler.

14 recordsLinked to original sources
PubMed1992

[24-hour blood pressure decrease with nifedipine with a new galenic action].

OBJECTIVE: Testing of the blood pressure-lowering effect of a slow-release (24 hours) nifedipine preparation. STUDY DESIGN: Single blind, randomized placebo controlled, single cross-over test; duration eight days. PATIENTS: 18 inpatients with essential hypertension and a blood pressure of more than 160/95 mmHg. MEDICATION: A single 60 mg slow-release nifedipine tablet (Aprical long 60 mg) administered daily at 1800 hours. MEASURING PARAMETERS: Pulse and blood pressure measured after 3, 12, 15, 18, 20, 22 and 24 hours post-administration. RESULTS: Even 18 to 24 hours after administration, the systolic blood pressure was reduced on average by 20 mmHg, the diastolic pressure by 14 mmHg. In the case of the test substance, the percentage of blood pressures in the target range (less than 160/95 mmHg) was 40 percentage points (systolic) and 49 percentage points (diastolic) higher than in the case of placebo. In 15 patients, both systolic and diastolic blood pressure was maintained within the defined target range for 24 hours. Reflex tachycardia was not observed, while other side effects such as headache, flushing, hot flashes, and leg edema occurred only rarely. There was evidence that an evening administration of the drug had a favorable effect on the morning blood pressure increase.

Adult↗
PubMed1992

[Nicotine excretion by the apocrine and eccrine sweat in smokers and passive smokers].

Specimens of apocrine and eccrine sweat collected without and after pilocarpine stimulation from smokers and non-smokers exposed to tobacco smoke were investigated for the presence of nicotine. The concentrations were determined by radioimmunoassay, so that the values obtained represent the concentrations of nicotine plus its metabolites, e.g. cotinine. Measurable nicotine concentrations were found in all samples. The levels measured in apocrine sweat were higher than those in eccrine sweat. The presence of unchanged nicotine in sweat was revealed by GC/MS.

Adolescent↗
PubMed1990

[Presence of methadone in apocrine sweat of the human].

The presence of methadone was investigated in 24-h perspiration samples obtained from patients receiving daily maintenance doses of the drug. The samples were collected from the axillary region. The concentrations measured by radioimmunoassay ranged from 8.3 ng/cm2 per 24 h up to 25.3 ng/cm2 per 24 h. The concentrations determined by RIA are the sum of methadone and its metabolites. The presence of the drug in the perspiration samples were also revealed by GC/MS.

Adult↗
PubMed1989

[Inhibition of prednisolone osteopathy by diphosphonate (EHDP) in an animal experiment].

The application of a low dose of prednisolone (0.4 mg per kg body weigh and day) in young hamsters leads to a loss of bone mass. This effect is inhibited by the administration of the diphosphonate EHDP (6.2 mg per kg body weight and day). The total volume of the limb bones is increased. The application of a high dose of prednisolone (40 mg per kg body weight and day) induces a severe osteopathy. These pathological bone changes couldn't be prevented by EHDP, but there was a significant shift of the investigated parameters into the direction of normalization.

Animals↗
PubMed1989

[Technical quality assurance in conventional x-ray diagnosis using medico-technical radiologists].

Without the x-ray assistant, regularly involved in everyday practice, technical quality assurance can hardly be accomplished. Therefore a model for the organization of quality assurance was developed and tested in practice. It implies accountable technical checks by the technician, that are controlled by a quality supervisor, and are subsequently evaluated by the radiation physics department. This positively influences quality consciousness of the radiographers and therefore the quality itself.

Germany, East↗
PubMed1987

Dosimetry of low-energy neutrons using low-pressure proportional counters.

Measurements in nearly monoenergetic beams of 144, 24.5, and 2 keV neutrons and of thermal neutrons have been performed with low-pressure proportional counters. The suitability of a tissue-equivalent proportional counter (TEPC) for dosimetry of low-energy neutrons has been investigated. In contrast to higher neutron energies, the modification of the primary radiation field by the detector wall and the contribution of secondaries produced in the gas are significant. These effects have been investigated by additional measurements with a carbon-walled proportional counter. The various physical processes of neutron interaction with wall and gas of the TEPC have been analyzed, and absorbed dose, kerma, and kerma contributions from the various processes are presented. In addition, dose contributions from contaminating neutrons and photons have been obtained for the calibration fields used. The results have been related to neutron fluence. The comparison with tabulated kerma factors shows excellent agreement, indicating the suitability of the TEPC method for dosimetry of low-energy neutrons.

Energy Transfer↗
PubMed1979

[Phosphonates and their importance for dental practice].

In the light of a literature review, the author deals with the significance of anorganic pyrophosphate in the mineralization process in the organism. Diphosphonates are synthetic substances which act on mineralisation. The author made experiments with them, the results of which might be of importance in the stomatological sphere with regard to caries reduction and plaque inhibition.

Animals↗
PubMed1975

On the effect of prednisolone on hamster bone.

Over a period of 10.8 weeks 0.4, 4.0 or 40.0 mg, respectively of prednisolone bisuccinate/kg/day were injected intramuscularly into Syrian golden hamsters with a body weight of about 100 g. The dosage of 4.0 mg of prednisolone/kg did not produce any osteoporotic changes. The modulus of elasticity and the fracture load of the bones under investigation did not differ from the values obtained in control animals. At a dosage of 0.4 mg of prednisolone/kg/day the values of analysis (density, ash/cm3, calcium/cm3 and hydroxyproline/cm3) decreased by 5-8 percent, and at a dosage of 40.0 mg of prednisolone/kg/day even by 20-34 per cent as compared with the control group. The modulus of elasticity and the fracture load were significantly changed.

Animals↗