Cardiologists may perform physical examinations or prescribe tests like electrocardiograms (EKG), exercise stress tests, and blood tests as part of the diagnosis. Additionally, they may recommend taking medications, making lifestyle adjustments, such as cutting back on stress and increasing exercise and managing weight. A cardiologist is qualified to carry out a number of operations, including cardiac catheter insertion and pacemaker implantation. In addition to participating in lab research to develop novel medicines, they might teach at universities.