Coronary vein sinus

The coronary vein sinus ( Sinus coronarius ) returns the venous blood of the heart to the circulation . It flows usually at the bottom of the right atrium ( atrium ) and collects the blood from the vena cardiaca media (runs with Ramus posterior interventricular the right coronary artery ), the small, coming from the right vena cardiaca parva (runs with the right coronary artery) and the great cardiac vein (runs with the left coronary artery and the anterior interventricular branch ).

It is possible to place a pacemaker probe in front of the left ventricle via the vena cardiaca magna . In this way, with a biventricular (three-chamber) pacemaker, the right and left ventricles can be stimulated at the same time, which comes close to natural stimulation of the heart.