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 ?
Reduction in Stent Usage: A recent study demonstrated that accurate measurement of coronary anatomy, using CorPath, reduced the use of unnecessary additional stents by 8.
Coronary anatomy could not be adequately visualized because of respiratory artefacts.
Various studies regarding coronary vasculature use predominantly adult subjects, hence, little consideration has been given to fetal coronary anatomy (Nowak et al.
Prasugrel is recommended after the patient is taken to the laboratory, and the coronary anatomy is seen if the patient was not given a [P2Y.
sup][1],[2] Although the angiography is the gold standard to evaluate the coronary anatomy and to discriminate acute coronary artery disease caused by ostial involvement from chronic coronary artery disease, the role of this examination is still controversial when the aortic dissection is concomitant suspected.
Simultaneous Anterior and Inferior Wall Myocardial Infarction in a Patient with Unusual Coronary Anatomy.
An interactive display tablet with drawing pen provides an easy way to label and reference coronary anatomy.
People with angina should undergo a stress test, and will usually receive a heart catheterization as well, in order to assess their coronary anatomy.
Prof Curzen said: "This study demonstrates that the non-invasive FFRCT analysis from a standard coronary CT scan has the potential to become the default method for the initial assessment of many patients with cardiacsounding chest pain by assessing both the coronary anatomy and physiology simultaneously.
Braunwald Eugene (1984): Normal coronary anatomy, Heart disease.
The incidence of normal coronary anatomy varies widely between 11% and 37% at different cardiac centre and also among different physicians at a single centre7.
Member of Iran's Inventors Association noted angiography as one of the diagnostic procedures in the field of cardiovascular diseases and said by this procedure it was possible to assess coronary anatomy and subsequently detect the lesion location and the appropriate treatment.