Atrial: Pertaining to the atria, the upper chambers of the heart, as in atrial fibrillation and atrial septal defect. From Healthy Heart Resources Signs Psoriasis May Be Affecting Your HeartDiagnosing Hypertrophic CardiomyopathyExercising With HCM: How to Sweat Safely Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew