Coronary Circulation

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Coronary Circulation

 

the blood supply to the cardiac muscle, carried by the intercommunicating arteries and veins that run throughout the myocardium.

In man, arterial blood is supplied mainly by the right and left coronary arteries, which begin at the base of the aorta. There are three types of blood supply—right coronary, left coronary, and general—which in some measure determine the nature of the pathology of the coronary circulation in the event of disease of the heart vessels. The coronary veins are both larger and greater in number than the arteries. The veins empty into the right atrium. The principal arterial and venous trunks are connected by a well-developed network of anastomoses, which facilitates collateral (shunt) circulation in cases of impairment of blood supply to the heart.

The great intensity of the blood supply to the myocardium is provided by a dense network of capillaries (approximately twice the number per unit volume than in the skeletal muscles). The level of the coronary circulation in a healthy body corresponds exactly to the force and frequency of the heartbeat. It is regulated both by physical factors (for example, blood pressure in the aorta) and by neural and humoral mechanisms. Coronary circulation is influenced by physical and mental condition and by the degree and character of stress or load. It is sharply impaired by nicotine and certain factors that lead to atherosclerosis, hyper-tension, and cardiac ischemia, such as overstrain of the nervous system, negative emotions, improper nutrition, and the absence of constant physical excercise. Coronary insufficiency and disturbances of coronary circulation are among the most frequent causes of death in economically developed countries, and there-fore their prevention and treatment (mainly of infarction) are the most pressing problems of modern medicine.

I. M. D’IAKONOVA and S. V. SAMOILOVA

References in periodicals archive ?
CT coronary angiography is an evolving technology that allows evaluation of the coronary vessels without the complications of cardiac arrhythmias, myocardial infarctions, coronary dissections, and femoral artery injuries that can occur with traditional coronary angiography.
The angiographic, IVUS, OCT, and MSCT imaging of the coronary vessels treated with the fully bioresorbable DESolve Novolimus Eluting Coronary Scaffold was projected live in the main arena at the 24th annual Transcatheter Therapeutics (TCT) conference.
I am also pleased with the multiple sizes of scaffolds that Elixir has available for this pivotal trial in order to readily support different coronary vessel requirements.
Significant damage can be caused to the heart and coronary vessels after an ischemic event (lack of oxygen to cardiovascular tissues), during the opening of a vessel to restore blood flow (restenosis), or through cardiovascular surgeries.
When comparing immediate and five days post-procedure results using IVUS (intravascular ultrasound), the coronary vessel expanded slightly, and Stentys followed intimately the vessel remodeling with perfect apposition.
The Corox[TM] OTW BP and Corox[TM] OTW S-BP leads offer a unique design that allows them to fixate in even unusual coronary vessel anatomies, which can preclude the use of other leads.
It also continues building on the growing body of clinical evidence suggesting a difference in these two drug-eluting stents, especially as patient and lesion complexity increases, such as in small coronary vessel disease.
9, 2011 /PRNewswire/ -- OrbusNeich today announced that the company's Genous Stent provides the most rapid healing of the coronary vessel compared with bare metal stents and drug eluting stents (DES) at 14 days post-implantation.
Everolimus has been shown to inhibit in-stent neointimal growth in the coronary vessels following stent or scaffold implantation.
This package is expected to increase the uptake of the Absorb BVS system, as it addresses clinical concerns surrounding the delivery of its device to occluded coronary vessels.
Contract notice: Delivery of the oct imaging of the coronary vessels and equipment for endovascular hypothermia divided into 2 parts, in the framework of the project development of cardiac assistance to the population of polish and belarus in the context of cross-border cooperation program poland-belarus-ukraine 2007-2013, the issue of character zp.
During the study period, a total of 5,157 individuals suffered a heart attack or unstable angina pectoris, both generally caused by calcification of the coronary vessels.