Search PubMed⌕ Search

Biomedical subjects

N Hahn

Publications and source records attributed to N Hahn.

At least 55 records · Page 3Linked to original sources
PubMed1976

[The effects of dihydroergo-corine,-cryptine and-cristine on Haemodynamics in experimental cardiogenic shock].

Experimental results demonstrate, that serial ligatures of the side brances of the anterior descending and circumflex artery in the openchest dog produce a hemodynamic and electrocardiographic criteria fullfilling cardiogrenic shock. The application of the alpha-receptor-blocking agens Hydergin is followed by a statistically significant increase of the mean aortic pressure, the left ventricular systolic pressure and the mean blood flow in the femoral artery. The left ventricular enddiastolic pressure in the left ventricular enddiastolic pressure in the left ventricle decreases statistically not significant, dp/dtmax is unchanged. Hydergin effects a slope of the increased peripheral vascular ristance; if the peripheral vascular risistance is lowered during cardiogenic shock, there will not be a further lowering after treatment. The results show, that Hydergin causes a dilation of peripheral vasoconstricted vessels without unwanted hemodynamic side effects.

Animals↗
PubMed1975

[The effect of a dimenhydrinate combination of the cardiovascular system and cerebral blood circulation in the anaesthetized dog].

The influence of Vertigo-Vomex (VV) and Vertigo-Vomex Retard (VVR) on the perfusion rate of the a. carotis interna and on the peripheral circulation was tested in 30 anaesthetized dogs. These drugs represent beta-dimethylamino-ethyl-benzhydrylether-1,3-dimethyl-8-chloroxanthine (dimenhydrinate, Vomex A) with the addition of pyridine-3-carbonic acid (nicotinic acid, niacin) and pyridoxine-HCl (vitamin B6) and its retard preparation. A) Angiographic researches of the brain vessels after i.v. injection of VV. B) Perfusion rate in the a. carotis int. by electromagnetic flowmeter; measurements of blood pressure, heart rate, and acid-base balance; reactions after injection of niacin, dimenhydrinate, and pyridoxine-HCl as well as after a combination of both. C) Same measurements as in B but after oral application. In one out of four cases there was a dilation of the brain vessels, in two cases there was a small one, in one case there was none. Niacin induces a short-lasting augmentation of the perfusion rate in the a. carotis int. simultaneously with rising aortic blood pressure. Dimenhydrinate with pyridoxine-HCl slightly increases the heart rate. Combined with niacin the perfusion rate shortly increases immediately after injection of niacin without any rise of blood pressure but combined with a fall in blood pH and standard bicarbonate. After oral application of VVR there was a slight but not significant augmentation of the perfusion rate in the a. carotis int. combined with rising blood pressure but with no change of the blood pH. Therefore the certain intivertigineous effect of VV and VVR cannot be explained by a rise of the perfusion rate in the inner ear or in the brain. In view of our results the central effect of dimenhydrinate combined with niacin and pyridoxine-HCl hypothetically may be improved by metabolic influences on the cells and their membranes.

Acid-Base Equilibrium↗