atrium of the heart


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atrium of the heart

The upper chamber of each half of the heart. The right atrium receives deoxygenated blood from the entire body (except lungs) through the superior and inferior venae cavae and coronary sinus; the left atrium receives oxygenated blood from the lungs through the pulmonary veins. Blood passes from the atria to the ventricles through the atrioventricular valves. In the embryo, the atrium is a single chamber that lies between the sinus venosus and the ventricle.
See also: atrium
References in periodicals archive ?
The left atrium of the heart is difficult to access but is where some of the most complex arrhythmias--irregular heartbeats--occur.
Paul MN) was cleared to market its Across Transseptal Access System, aimed at improving control and simplifying the procedure used to access the left atrium of the heart during surgery.
ProRhythm's proprietary balloon catheter to treat tissue in the left atrium of the heart is used in an AF ablation procedure commonly called pulmonary vein isolation.
Finally, the wire is threaded into the right atrium of the heart. The area is stimulated with electric shocks to show the surgeon where the short-circuiting is taking place.