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At least 307 records · Page 17Linked to original sources
PubMed1976

An autoradiographic analysis of [3H]alpha-bungarotoxin distribution in the rat brain after intraventricular injection.

Purified alpha-bungarotoxin was isolated by chromatography and made radioactive with tritium ([3H]acetamidino-alpha-bungarotoxin). Infusions of [3H]alpha-bungarotoxin alone or preceded by tubocurarine or atropine were given into the third ventricle. 2. 12, or 24 h after injection the brains were prepared for autoradiography. Injections of alpha-bungarotoxin (radioinert) in buffer, or of [3H]parathyroid hormone in buffer, served as controls. The various patterns of labeling suggest the presence of nicotinic-cholinergic neurons within the arcuate and basolateral regions of the hypothalamus including the supraoptic and suprachiasmatic nuclei and, in addition, the central nucleus of the amygdala.

Amygdala↗
PubMedDate not supplied

Effects of the intracoronary and intraventricular injections of a commonly available vs. a newly available contrast medium.

Two contrast media (Renografin 76 and Isopaque 370) were used in a double-blind study for coronary angiography and left ventriculography. Fifty-eight patients with presumed coronary artery disease were studied. The effects of the contrast media upon the myocardium and upon ventricular function of patients with and without coronary artery disease were assessed. Pre and post angiography myocardial enzymes were obtained. Cardiac output was determined before and after the angiograms. Hemodynamic and electrocardiographic changes were continuously monitored during the procedure. The study showed that both contrast media produced similar changes; however, the "maximum" decrease in T wave amplitude was more marked in the normal group when Renografin 76 (as compared with Isopaque 370) was injected (p = 0.05) on the right. Renografin 76 injection into the left coronary artery produced a higher median T wave amplitude in lead II relative to Isopaque 370 only in the abnormal group (p = 0.01). The heart rate dropped more severely in the normal patients when the left coronary artery was injected with Renografin 76 than with Isopaque 370 (p = 0.05).

Angiocardiography↗
PubMed1974

Strain differences in the inhibition by hemicholinium-3 of the pressor response to intraventricular injection of neostigmine in rats.

The pressor response to intracerebroventricular (i.c.v.) injections of neostigmine was examined in three groups of Sprague-Dawley rats (MFS, CS and CFE) obtained from different breeders and in Long-Evans rats (MLE) obtained from one of the same breeders. All rats responded with a rise in blood pressure to i.c.v. injection of neostigmine, although the CFE strain was 6-fold less sensitive to the drug than were the other strains.Prior i.c.v. injection of hemicholinium-3 (HC-3; 0.4 mug) reduced by more than 50% the pressor response in the two strains obtained from the same breeder (MFS and MLE) and caused an 1 1% reduction in the CS strain. In contrast, the pressor response in CFE rats was not affected by as much as 40mug of HC-3, although this dose decreased the response to neostigmine by 47-66% in the other three strains.

Animals↗