Coronary Circulation


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Related to Coronary Circulation: Coronary arteries

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 ?
* Two weeks before the intervention, one group was asked to prepare for a seminar on brain circulation and the other group was asked to prepare for a seminar on coronary circulation.
In the transgenic mouse model of dilated cardiomyopathy (Tgalphaq* 44 mice), endothelial dysfunction in coronary circulation is associated with excessive RoS generation by cardiac NAD(P)H oxidase (56).
Coronary circulation of Puma concolor may be considered balanced, given two criteria.
Coronary artery disease has been designed as "impairment of heart function due to inadequate blood flow to the heart compared to its needs, caused by obstructive changes in the coronary circulation to the heart".
Myocardial infarction is the result of increased myocardial metabolism demand, decreased delivery of oxygen and nutrients to myocardium through coronary circulation due to rupture or ulceration of unstable atherosclerotic plaque resulting in occlusion of vessels causing infraction of subjacent myocardium3.
In current catheter research, there are 3 main directions with respect to fractional flow reserve (FFR), including instantaneous wave-free ratio, noninvasive measurement of FFR, and FFR transferred from coronary circulation to other ischemia-inducing circulation.
For cardiologists, internists, and others, specialists from the US, India, and Guatemala emphasize advances in the understanding of coronary circulation, the molecular mechanisms of myocyte function, and the assessment of regional and global ventricular functions in physiologic and pathologic conditions, and address advances in cardiovascular pharmacology, including the advantages and disadvantages of diuretic therapy, vasodilators, neurohormone modulators, positive inotropic agents, and antilipid, antithrombotic, and antiplatelet agents, and their clinical pharmacology in the management of various cardiovascular disorders.
Although establishing dual coronary circulation in childhood is a common practice, treatment of this anomaly in adult patients is controversial.
The 12 articles in this book intended for cardiologists, researchers, physicians, and medical students consider current topics in the study of the coronary circulation in both smokers and non-smokers.
Understanding the risk of myocardial infarction or bleeding in the setting of non-cardiac surgery with drug-eluting stents present in the coronary circulation is an important factor in deciding appropriate management of these patients.
Key words: Coronary artery abnormalities, Coronary circulation, Ectopic coronary arteries, Coronary artery malformations, Angiography
(18) showed that high IL-6 concentrations in the coronary circulation after PTCA were associated with an increased risk of restenosis, although the sample size was small and stent placement was performed in only 12 patients.