Pulmonary vein cardiac myocyte (PV myocyte)

Cardiac myocytes in the pulmonary vein ostia are specialized heart muscle cells that extend from the left atrium into the proximal portions of the pulmonary veins, forming structures known as myocardial sleeves. These cells possess unique electrophysiological characteristics, including a shorter action potential duration and a higher propensity for spontaneous diastolic depolarization compared to typical atrial myocytes (Source: PubMed, PMID: 12574145). They are clinically significant as the primary anatomical source of ectopic electrical triggers that initiate paroxysmal atrial fibrillation (Source: N Engl J Med, PMID: 9738085). While not a single molecular target, these cells are the focus of anti-arrhythmic drug therapy and catheter-based ablation procedures like pulmonary vein isolation (Source: StatPearls, "Atrial Fibrillation"). Drugs interacting with these cells typically target various ion channels, such as the sodium (Nav1.5) and potassium (Kv11.1) channels, to suppress abnormal automaticity and re-entry. Understanding the specific ionic currents and signaling pathways within these myocytes is vital for improving the efficacy and safety of treatments for cardiac arrhythmias.

Other names

Myocardial sleevePulmonary vein sleevePV cardiomyocytePulmonary vein ostium myocyte

Inhibition of voltage-gated ion channels (sodium, potassium, and calcium) to suppress ectopic firing and prolong the refractory period.