coronary circulation

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coronary circulation

Movement of blood through the vessels of the heart, specifically from the ascending aorta to the epicardial coronary arteries to the penetrating arteries of the myocardium, the coronary arterioles, capillaries, veins, coronary sinus, and into the right atrium. A few of the small veins open directly into the atria and ventricles.
See: illustration
See also: circulation


movement in a regular or circuitous course, returning to the point of origin, as the circulation of the blood through the heart and blood vessels. See also circulatory system.

antegrade circulation
circulation in the normal direction of flow.
artificial circulation
is maintained in cardiopulmonary arrest by cardiac compression.
collateral circulation
circulation carried on through secondary channels after obstruction of the principal channel supplying the part.
coronary circulation
that within the coronary vessels, which supply the muscle of the heart.
cutaneous circulation
cutaneous vessels are innervated by sympathetic adrenergic vasoconstrictor fibers; vasodilation is an important mechanism for losing heat after the body has been warmed.
enterohepatic circulation
the cycle in which bile salts and other substances excreted by the liver in the bile are absorbed by the intestinal mucosa and returned to the liver via the portal circulation.
extracorporeal circulation
circulation of blood outside the body, as through a hemodialyzer or an extracorporeal circulatory support unit.
fetal circulation
circulation of blood through the body of the fetus and to and from the placenta through the umbilical cord. See also fetal circulation.
hepatic circulation
includes the hepatic arterial blood supply and the supply from the portal vein; drainage is via the hepatic veins to the caudal vena cava.
lymph circulation
see lymph.
maternal circulation
the circulation of the dam during pregnancy, including especially that of the uterus.
neonatal circulation
circulation in the newborn immediately after birth; the umbilical vessels contract forcing blood into the fetal veins; the foramen ovale closes, the ductus arteriosus narrows and eventually closes at day 1 to 2 after birth.
ocular circulation
consists of the uveal and retinal blood vessels supported by the aqueous humor and vitreous body.
placental circulation
consists of the umbilical arteries, the vessels of the placenta proper and the umbilical veins; approximates the fetal corporeal circulation in volume.
portal circulation
a general term denoting the circulation of blood through larger vessels from the capillaries of one organ to those of another; applied especially to the passage of blood from the gastrointestinal tract, pancreas and spleen through the portal vein to the liver.
pulmonary circulation
the flow of blood from the right ventricle through the pulmonary artery to the lungs, where carbon dioxide is exchanged for oxygen, and back through the pulmonary vein to the left atrium. See also pulmonary circulation.
splenic circulation
flow of blood through the splenic artery and arterioles to either the capillaries, e. g. white pulp, or the highly permeable sinuses of the red pulp. Splenic venous blood drains into the portal vein and passes through the liver before re-entering the general circulation.
systemic circulation
the flow of blood from the left ventricle through the aorta, carrying oxygen and nutrient material to all the tissues of the body, and returning through the superior and inferior venae cavae to the right atrium.
circulation time
the time required for blood to flow between two given points. It is determined by injecting a substance into a vein and then measuring the time required for it to reach a specific site.
References in periodicals archive ?
As the heart beats faster and harder, the coronary vessels open up and supply the additional blood flow that is required to feed the heart's increased demand.
The results of this study demonstrate that the newly developed integrated technique of vessel segmentation, plaque detection and 3D visualization of blood flow is useful for an accurate assignment of coronary vessel segments, and suggest that it may be helpful to improve the interpretative and decision-making process in the treatment of patients with coronary artery disease.
Cases consisted of CAD patients with at least 1 coronary vessel with > 50% stenosis.
In clinical practice, electrocardiogram (ECG) criteria is used to differentiate STEMI from NSTEMI, but ECG has been shown to have a very low sensitivity in detecting acute MI (AMI)11 and thus occlusion of a coronary vessel.
Influence of coronary vessel size on re-narrowing process and late angiographic outcome after successful balloon angioplasty.
Autopsy studies have demonstrated that the coronary vessels of SLE patients have atherosclerotic plaque, and most cardiovascular events are not attributable to active vasculitis.
Doctors implanted a metal mesh to help keep open a coronary vessel following the surgery.
Regular exercise helps keep blood cholesterol in check, decreases the resting heart rate, increases aerobic capacity, decreases blood pressure, and increases coronary vessel size.
Acute coronary vessel closure was defined as the loss of vessel patency during PTCA procedure or after the patient had left the catheterization laboratory but during hospitalization.
Von Beckerath calls the link between potassium channels and coronary vessel enlargement surprising, noting that investigators have focused on other possible causes for dilation, including chemicals that react with smooth-muscle cells or the endothelial cells lining blood vessel walls.
The scaffold is designed to resorb in the body within 1 to 2 years after implantation and return the patients' coronary vessel to de novo state.
Doctors could easily zoom into critical areas, and the hands-free voice recognition technology also helped them visualise and operate on the distal coronary vessel.