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The Electrical Impulse of the Heart Normally Begins at the Sinoatrial Node: 2026 Clinical Guide
"The electrical impulse of the heart normally begins at the sinoatrial (SA) node, serving as the heart's natural pacemaker to regulate the cardiac cycle. Understanding this electrophysiological cornerstone is vital for interpreting modern electrocardiograms (ECGs), diagnosing arrhythmias, and managing cardiovascular health in clinical practice. Anatomy and Physiology of the Primary Cardiac Pacemaker The sinoatrial node is a specialized cluster of fusiform pacemaker cells situated subepicardially at the junction of the superior vena cava and the right atrium. Measuring approximately 15 millimeters in length, 2 millimeters in width, and 1 millim..."
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