Anatomy & Physiology: Current Research
Open Access

Abstract

Molecular Mechanisms of Cardiac Electrophysiology and Arrhythmias

Luis Fernando Ortega

Cardiac electrophysiology represents one of the most intricate and fascinating areas of human physiology. The heart's ability to generate and propagate electrical impulses in a highly coordinated manner ensures efficient contraction and uninterrupted blood circulation throughout the body. At the molecular level, cardiac electrical activity depends on the coordinated movement of Sodium (Na?), Potassium (K?) and Calcium (Ca²?) ions across specialized ion channels embedded within the membranes of cardiomyocytes. These ion channels generate the cardiac action potential, which initiates myocardial contraction and synchronizes electrical conduction through the sinoatrial node, atrioventricular node, bundle branches and purkinje fibers. I believe that the remarkable precision of these molecular events highlights the extraordinary complexity of cardiac physiology, where even minor alterations in ion channel function may produce significant disturbances in heart rhythm. One of the most significant developments in recent years has been the identification of genetic mutations associated with inherited arrhythmia syndromes.

Published Date: 2025-04-02; Received Date: 2025-03-03