Final answer:
Cardiologists may diagnose and treat heart failure by conducting a physical examination, ECG, and chest X-ray. Medications, reduced salt intake, and supervised exercise may be recommended.
Step-by-step explanation:
Cardiologists are doctors who specialize in treating heart diseases, including heart failure. To diagnose heart failure, cardiologists may conduct a physical examination, an electrocardiogram (ECG) to measure the heart's electrical activity, and a chest X-ray to check for an enlarged heart. The doctor may prescribe appropriate medications, recommend a reduction in salt intake, and advise a supervised exercise program.