Biomedical subjects

G Hitzenberger

Publications and source records attributed to G Hitzenberger.

At least 109 records · Page 6Linked to original sources

PubMed1977

[Treatment of coronary insufficiency with beta-receptor antagonists (author's transl)].

The pathophysiology of the coronary insufficiency, the effect of beta-receptor antagonists, the understanding of these effects on the basis of the pathophysiology and the possibilities of testing beta-receptor antagonists in patients with coronary insufficiency are discussed. It is pointed out that the pathophysiology of the coronary insufficiency is based on the difference between oxygen demand of and oxygen supply to the myocardium. beta-Receptor antagonists compensate for this difference. Testing beta-receptor antagonists should include tolerance to exercise and controlled studies using standard medication for comparison.

Adrenergic beta-Antagonists↗

PubMed1977

A model for distinguishing between beta1-receptors which mediate a specific effect on the heart rate and those which mediate a positively inotropic effect.

The study was conducted in six healthy male volunteers aged between 20 and 30 years. Cardiac output was determined by means of the Swan-Ganz-thermodilution-method. A control-study was carried out, during which an isoproterenolinfusion with increasing doses was given. Fifty minutes after i.v. injection of a beta-receptor-blocker the hemodynamic parameters were measured again under increasing doses of isoproterenol until the block was overcome. This study procedure was performed twice in each subject at an interval of at least 14 days. For the one study 15 mg propranolol i.v. and for the other 0,5 mg mepindolol i.v., a new beta-receptor-blocker, were injected. After i.v. injection of propranolol the dose-response-relationship-curve for the heart-rate (HR) and stroke volume (SV) describes a definite shift to the right. After mepindolol the dose-effect curve for the heart rate describes a definite shift to the right, as seen with propranolol. In contrast, only a very slight shift can be seen in respect of the SV increase, i.e. the SV and HR curves dissociate under mepindolol. The results of our study indicate, that a distinction can be made with respect to the so-called beta 1-receptors between those mediating a specific effect on the heart-rate and those mediating a mainly positive inotropic effect.

Adrenergic beta-Antagonists↗

PubMed1977

[Indications for the determination of plasma concentrations of aminoglycosides (author's transl)].

Provided a well-equipped laboratory and a properly trained staff are available, plasma concentrations of aminoglycosides should be determined in cases of severe impairment of renal function, changes in the body fluid content (oedema, dehydration), and anemia. In the absence of the above-mentioned facilities, the half-life should be estimated on the basis of creatinine clearance, and the plasma concentration calculated accordingly. Close clinical supervision of patients receiving aminoglycosides is however the most important aspect of treatment.

Aminoglycosides↗

PubMed1977

The bio-availability of beta-acetyldigoxine (Novodigal) alone and combined with oxyfedrine (Ildamen-Novodigal).

The bio-availability of various galenic preparations of beta-acetyldigoxine was tested in six healthy probands after a single oral dose (1 mg). The availability parameters were calculated from the areas under the plasma concentration curves and from the cumulative urinal excretion. There was no significant difference between the bio-availabilities of Novodigal (beta-acetyledigoxine tablets), Ildamen-Novodigal (beta-acetyldigoxine and oxyfedrine) and an alcoholic solution of beta-acetyldigoxine. Correlation calculations showed that the determination of the plasma concentration courses up to six hours after substance application are most favourite in regard to judging the absorption processes of digoxine preparations. For the assessment of the bio-availability, the methods of comparing the areas under the blood level curves of 0 to 6 hrs and of comparing the cumulative urinal excretion over a period of 24 hrs were of equal validity.

Adult↗

PubMed1977

Pharmacokinetics of Lidaprim in cases of impaired renal function.

Elimination half-life times, plasma concentrations, and minimal cumulation factors are being determined resp. calculated for trimethoprime and sulfametrole (free as well as total amounts)--both combination partners of Lidaprim--in healthy volunteers and in patients with impaired renal function. There is a strong influence of renal function on the cumulation of the metabolized part of the sulfonamide, a weaker one on trimethoprime, and almost none on the free sulfonamide. On account of the sulfonamide metabolite cumulation, a reduction by half of the standard dose of Lidaprim is recommended if the creatinine clearance is below 20-30 ml/min.

Adult↗

PubMed1977

The bio-availability of beta-acetyldigoxine alone and combined with aluminum hydroxide and magnesium hydroxide (Alucol).

The bio-availability of Novodigal (beta-acetyldigoxine) alone and applied together with Alucol (aluminum hydroxide, magnesium hydroxide) was studied in six healthy probands. Bio-availability parameters were calculated from the areas under the plasma concentration curves and from the comparison of the blood levels after absorption during steady state. There was no significant difference between the bio-availability of beta-acetyldigoxine alone and that of the combination with Alucol. Thus, beta-acetyldigoxine combined with antacids of the aluminum hydroxide and magnesium hydroxide type can be applied in the same dosage as usual since no decrease of effect has to be apprehended.

Adult↗

PubMed1976