Cardiology Services Our cardiology services focus on the diagnosis, treatment, and ongoing management of heart conditions. Our team of specialists work with you to assess your heart health, provide expert care, and support your long-term well-being. Learn more about Horizon’s cardiology clinics and the diagnostic tests that we offer. Clinics Cardiac Rehabilitation Program Heart Function Clinic Surgery Pre-assessment Clinic Diagnostic Testing ECG (Electrocardiogram) Holter Monitoring: Medical Imaging Ambulatory Blood Pressure Monitoring