Coronary Circulation

(redirected from Coronary vessels)
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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 ?
However, when coronary disease is present, blockages in the coronary vessels can limit blood flow, leading to slowed and inadequate oxygen supply.
Several methods are proposed for automatic centerline extraction of coronary vessel based on medialness filter [10], fuzzy corrected function [11] and model fitting [12].
A total of 110 patients undergoing coronary angiography were included, 55(50%) Patients were those who demonstrated at least one coronary vessel with > 50% stenosis on angiography.
Angiographic findings, including dominance (left, right or co-dominant), numbers and types of coronary vessels involved, including left main (LM), left anterior descending (LAD) artery, left circumflex (LCX), Ramus Intermedius (RI) and right coronary artery (RCA), were retrieved.
Her MI was unavoidable since most infarctions are due to plaque rupture in coronary vessels that aren't occluded enough to require treatment.
2,5,6) The isolated finding of coronary artery wall dissection during gross examination at autopsy, or, in rare instances, during radiographic imaging of the coronary vessels, temporarily places this entity under the umbrella of SCAD, but the microscopic features that are appreciated in hematoxylin-eosin-stained sections pinpoint the definitive diagnosis of ECM.
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.
The physical stress and pain associated with severe infection may also cause constriction of the coronary vessels, reducing bloodflow to a hard-working heart muscle.
End stage renal failure (in these patients coronary vessels were calcified and having advanced atherosclerosis) and Coronary anomalies (vessels may be narrower or ecstatic) were excluded from the study.
This is known as myocardial steal; hence the nickname of Al Capone of coronary vessels.