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Biomedical subjects

R Arbogast

Publications and source records attributed to R Arbogast.

At least 55 records · Page 3Linked to original sources
PubMed1979

An auditory von Restorff effect.

In this experiment 60 undergraduates were given a serial learning task to assess the possibility of an auditory von Restorff effect. Fifteen males and 15 females learned a list of nine words presented aurally (recorded) with the same male voice (control groups). Fifteen males and 15 females (experimental groups) learned the same list as the control groups except that the sixth word was spoken by a female voice: i.e., it was isolated. The results of this study parallel the results of studies using visual stimuli. The von Restorff effect was demonstrated with auditory stimuli in that one of the experimental groups (female) learned the list with significantly fewer errors than the comparable control group. No difference was found between the male groups.

Female↗
PubMed1978

Effects of acute ethanol on the contractile state of normal and failing cat papillary muscles.

The direct effects of 100, 300 and 500 mg/100 ml ethanol on contractility of isolated, supported right ventricular papillary muscles were evaluated from 10 normal or failing cat hearts. In isometrically contracting muscles, 500 mg% ethanol decreased maximum tension in normal and failing hearts from 7.1 to 4.3 g/mm2 (P less than 0.001) and 3.4 to 2.3 (P less than 0.01) respectively, and lowered maximum tension rise from 30.4 to 20.2 g/mm2/sec (P less than 0.001) and 10.2 to 0.8 (P less than 0.01), without alterations of time to peak tension. In isotonically contracting muscles, 500 mg% ethanol reduced contractile element velocity at 0.5 g/mm2 load in normal and failing ventricles from 1.27 to 0.97 L/sec (P less than 0.001) and 0.59 to 0.39 (P less than 0.001) respectively. Thus, clinically meaningful doses of ethanol clearly, exerted dose-related negative inotropic actions on both normal and failing myocardium, thereby indicating that ethanol ingestion may exacerbate heart failure in diseased hearts.

Animals↗
PubMed1976

[Contractility of the left ventricle in experimental septicemia].

In experimental septicemia a decrease of myocardial contractility could be demonstrated. Periodically a correlation between disturbance of contractility and endotoxinemia exists. Starting point of infection and type of bacteria were of no detectable influence. As far as the disturbance of contractility is concerned one must take into consideration the cardiotoxic effect of endotoxin, the influence of shock mediators, lacticemia as well as the decrease of coronary perfusion pressure.

Animals↗