H Levin… - US Patent 7,869,874, 2011 - Google Patents ... The healthy heart controls its rhythm from its sinoatrial 45 (SA) node, located in the upper portion of the right atrium. The SA node generates an electrical impulse at a rate com- monly referred to as the "sinus" or "intrinsic" rate. ... SA node is the natural pacemaker of the heart. ... Related articles - All 3 versions
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