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Biomedical subjects

S Constantinescu

Publications and source records attributed to S Constantinescu.

89 records · Page 5Linked to original sources
PubMedDate not supplied

[Adaptation of the myocardium to ischemia: study of suspension of the mitochondria as related to the development of the collateral circulation].

The authors developed an experimental model by means of which they established in the dog the role of short duration ischaemia (1-5 minutes) in triggering local haemodynamic changes that led to the rapid development of a collateral circulation, with retrograde filling, able to furnish subsequently blood supply to the distal segment of a main coronary artery obstructed for 20 minutes. Histological study, electron microscopy, biochemical tests and mitochondrial suspensions revealed the value of the latter method, being the most reliable test for appraising the remaining postischaemic functional potential. The data obtained may serve as a basis for understanding the role of the coronary colateral circulation in man, in coronary obstruction, and the means of developing this circulation.

Animals↗
PubMedDate not supplied

Investigations on the morphophysiological basis of revascularization of the myocardium by the Vineberg method.

A study was carried out on the dynamics of vasculogenesis and the formation of mammary-coronary anastomoses within the first seven months after implantation of the internal mammary artery in the left ventricular myocardium, according to the Vineberg method. The efficiency of these anastomoses was demonstrated 4 to 7 months later by the absence of lesions 8 to 10 days after transitory and permanent myocardial ischaemia induced by coronary obliteration. The lesions could not be prevented in the case of thrombosis of the internal mammary artery or when ischaemia was produced concomitantly with the implant or before the mammary-coronary arteriolo-arterial anastomotic network developed.

Animals↗
PubMedDate not supplied

Ultrastructural and biochemical alterations induced by propranolol treatment in experimental myocardial ischaemia.

The effect of propranolol within the first ten days after a transient experimental myocardial ischaemia was investigated. As compared to the untreated control lot, the ultrastructural and biochemical lesions appeared to be much reduced and within reversible limits. Worthy of note was the slight affection of mitochondria revealed by the level of mitochondrial enzymes, the presence of lysosomal and phagolysosomal structures and capillaries of normal aspect, and the absence of cytolysis. The favourable effect of this beta-blocking drug might be attributed to its protective action on the cellular and capillary membrane systems.

Animals↗
PubMedDate not supplied

Chemical sclerosis of the adrenal medulla with sodium salyclate (2.5 M) - histopathologic, histoenzymatic, electron microscopic and biochemical studies.

The selective inhibitory effect of sodium salicylate (2.5 M) on the adrenal medulla was investigated histopathologically, histoenzymatically, electron microscopically and biochemically. It was proved that the different behaviour of nicotinamide-adenine dinucleotide (NAD) and nicotinamide-adenine dinucleotide phosphate (NADP) linked dehydrogenases under the action of sodium salicylate can account for the survival of cortical cells, while the medullar ones are necrosed.

Adrenal Cortex↗
PubMedDate not supplied

[Comparative study of 2 serological methods of diagnosis of acute respiratory Mycoplasma pneumoniae infections].

Complement fixation (CF) and haemagglutination (HAP) with M. pneumoniae antigen have proved valuable methods for the etiological diagnosis of acute respiratory infections. Both methods are sensitive and specific, provided purified antigens are used, of the Kenny and Grayston lipid antigen type for CF and the antigen treated by ultrasound and purified by centrifugation for HAP. Concomitant and repeated use of both tests is recommended, following the taking of paired serum samples at 7 to 10 day intervals the first samples being taken within the first ten days of the disease. A single test can only be used for a presumptive serologic diagnosis of acute infection with M. pneumoniae and only if the minimal diagnostic titre is taken into consideration, i.e. 1/64 for CF and 1/160 for HAP.

Acute Disease↗
PubMedDate not supplied

Medullosclerosis, contralateral adrenalectomy and splanchnicosympathectomy in severe essential arterial hypertension and thromboangiitis. Part II.

Operations were performed in 58 patients with severe essential hypertension and in 105 patients with Buerger's thromboangiitis. No postoperative deaths were recorded. The mean adrenalinemia value decreased by 70.91% and that of noradrenalinemia by 10.34%. Systolic pressure decreased by about 30--50 mm Hg and the diastolic pressure by 10--30 mm Hg. The delayed results (1--20 years) were good in 62% of the patients with IIIrd-degree eye lesions and in 17% of the patients in the organofunctional stage II, in 17% of the patients in stage II--III of restricted necrosis, and in 4% of the patients in gangrenous stage III.

17-Ketosteroids↗