A cardiologist diagnoses and treats all types of cardiac disease, ranging from arrhythmias, congestive heart failure and myocardial infarction to angina and coronary artery blockage. Along with the cardiologist’s team of nurses and cardiopulmonary technicians, they can utilize EKGs, stress tests, radiologic imaging and a variety of treatment modalities to optimize the lifestyles of patients with most types of cardiac dysfunction.