Why would a patient's cardiologist send his patient to a heart specialist?

A cardiologist may refer a patient to a heart specialist, such as an electrophysiologist or interventional cardiologist, for more specialized care when the patient's condition requires advanced diagnostic techniques, treatments, or procedures beyond the cardiologist's scope. This could include complex arrhythmias, structural heart issues, or the need for surgical interventions. Additionally, a heart specialist may have access to the latest technologies and therapies that can better address the patient's specific heart condition.