Because their heart functions more efficiently ... takes information about how fast the heart is beating from the sinoatrial ...

Sinoatrial exit block occurs when the action potential initiated by the sinoatrial node is inhibited or completely blocked before it is able to leave the SA node and reach the atrium, and thus no ...

Withholding drugs that suppress the sinoatrial nodal function, if possible ... sinus syndrome is related to replacement of the sinus node with fibrinous tissue. This usually occurs concomitantly ...