Cardiac voltage-gated ion channels

Cardiac voltage-gated ion channels are specialized transmembrane proteins that facilitate the rapid movement of ions across the sarcolemma in response to changes in membrane voltage (StatPearls, 2023). These channels, primarily comprising sodium (Nav1.5), calcium (Cav1.2), and various potassium channels (e.g., hERG, KvLQT1), are the fundamental determinants of myocardial excitability and the cardiac action potential (PubMed, PMID: 29038201). By orchestrating the phases of depolarization and repolarization, they ensure the rhythmic and synchronized contraction of the heart (NIH, 2022). Dysfunction in these channels, whether due to genetic mutations (channelopathies) or acquired conditions, is a primary cause of life-threatening arrhythmias such as Long QT syndrome and Brugada syndrome (UniProt, 2024). Consequently, these channels are major therapeutic targets for antiarrhythmic drugs, which modulate ion conductance to restore normal electrical activity, although such interventions require careful monitoring due to the risk of proarrhythmia (PubChem, 2024).

Other names

Cardiac ion channelsVoltage-gated sodium channelsVoltage-gated potassium channelsVoltage-gated calcium channelsMyocardial ion channels

Modulation of ion conductance through voltage-gated sodium, potassium, or calcium channels to alter the cardiac action potential duration, refractory period, and conduction velocity (Vaughan Williams Classification).