Atrial Fibrillation. We have set the standard in the region for atrial fibrillation care, the most common form of arrhythmia, or abnormality of heart rhythm, through a track record of outstanding patient care, groundbreaking scientific research and the use of innovative technologies and techniques. Atrial Septal Defect. If you or a loved one is diagnosed with an atrial septal defect, our cardiologists will guide you through diagnosis and treatment. Bradycardia. If you or someone you care for has bradycardia, the heart may be beating fewer than 60 beats per minute which could lead to dizziness and fatigue. At HCC - Cardiology & Vascular Consultants our practitioners treat every symptom, from the most commonplace to the most acute, with the same exacting diagnostic discipline. And we approach every patient and family with the same compassionate concern.