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Biomedical subjects

M J RAND

Publications and source records attributed to M J RAND.

44 records · Page 3Linked to original sources
PubMed1958

A comparison of antifibrillatory drugs in the heart-lung preparation.

Quinidine, amethocaine, Trasentin and atropine have been tested for their ability to stop atrial fibrillation produced in the heart-lung preparation of the dog by stimulating the right atrium in the presence of acetylcholine. The results suggest that atropine acts by specifically antagonizing acetylcholine, but that amethocaine and Trasentin act chiefly by virtue of their quinidine-like properties.

Acetylcholine↗
PubMed1958

The depressor action of dopamine and adrenaline.

Dopamine is a pressor agent in the spinal cat, but causes a fall of blood pressure in the guinea-pig and rabbit under urethane anaesthesia. When guinea-pigs and rabbits are injected with reserpine, which depletes the vessel walls of noradrenaline, dopamine then becomes pressor. If an intravenous infusion of noradrenaline is given the depressor action returns. An intravenous infusion of vasopressin does not have this effect.A strip of rabbit aorta is caused to contract by noradrenaline and by dopamine, but if dopamine is added at the height of a noradrenaline contraction it causes relaxation.Adrenaline causes a fall of blood pressure in the cat under ether with vagi cut. However, in a reserpine-treated cat its action is pressor. The depressor action is restored during an infusion of noradrenaline. Noradrenaline has thus been shown to cause a vasomotor reversal of dopamine and of adrenaline.

Animals↗