The effect of polyamines on the endothelium and vascular wall metabolism in the rat.

Administration of putrescine, a polyamine, to rats leads to endothelial injury manifesting itself by an increased number of endothelial cells circulating in blood. Moreover, putrescine affects the metabolism of the arterial wall itself, primarily by increasing the activity of phosphomonoesterases I and II and by decreasing the activities of Krebs cycle enzymes, both of which are phenomena that can be regarded as "preatherogenic" changes 5, 6, 8, 11 preceding the onset of pathological processes in the arterial wall. Putrescine significantly decreases aortic ATPase (adenylpyrophosphatase) both in the acute and chronic phases of experiment.

Metabolic changes in the arterial wall and endothelial injury in experimental methioninaemia.

Chronic administration of methionine to rats induced endothelial lesion manifested by increased endothelaemia and metabolic changes indicative of pathological processes involving the vessel wall. These changes did not spontaneously return to values observed in control animals. Long-term administration of antiatherosclerotic drugs Pyridinolcarbamate and Phtalazinole II normalized metabolic disorder in the aortic wall and reduced endothelaemia to normal values.

Experimental regional myocardial ischaemia and myocardial uptake of potassium analogues; intercomparison of 42K, 86Rb and 201Tl.

The uptake of 42K, 86Rb and 201Tl by non-ischaemic and ischaemic myocardium was determined in rats with coronary artery ligature lasting 10, 30, 60 and 120 min, and in control rats without ischaemia. Whereas the myocardial concentration of 201Tl and 42K in control rats was similar and higher than that of 86Rb, 201Tl was superior to the other two radionuclides due to its significantly higher accumulation in non-ischaemic myocardium and the higher ratio of non-ischaemic to ischaemic radioactivity. The 86Rb accumulation in non-ischaemic myocardium and non-ischaemic/ischaemic ratio began to decrease from its maximum at 10 min.

The effect of trimepranol in the ischaemic focus in the dog.

The authors tested metipranolol (Trimepranol Spofa) for its effect in the ischaemic focus in the dog. Electrodes were sutured on the left ventricular myocardial surface and a ligature was prepared on the descending branch of the left coronary artery. One week after the operation the artery was ligated without chest opening, and electrograms were recorded.

Protective effect of Mercurascan after coronary artery ligation in the dog.

The protective effect of hydroxymercurifluorescein (Mercurascan, MSC) on the ischemic myocardium was evaluated in dogs. MSC was given 17 min after ligation of the descending branch of the left coronary artery in closed-chest animals. The favorable effect of this drug was confirmed (1) by an immediate decrease of ST-segment elevation in electrograms from epicardial electrodes, (2) by a reduced number of Q waves 24 h after the ligation, and (3) by the preservation of CPK activity in the sites with moderate early ST-segment elevations.

The effect of anabolic hormone 19-nortestosterone propionate on the metabolism of striated muscle during experimental ischaemia.

The effect of the anabolic hormone 19-nortestosterone propionate (Superanabolon Spofa) on the metabolism of chronically ischaemic striated muscle (anterior tibial m.) was studied in a described model in the rat. Metabolic changes were estimated in terms of the activities of a number of enzymes in muscle fibres.

Isoenzymes of lactate dehydrogenase in varicose veins.

The activity of lactate dehydrogenase and fractions of this enzyme has been estimated in human large saphenous veins. Typical varicosities were compared in composition with normal veins from the same patients. The total LDH activity was significantly decreased in typical varicosities.