What are the symptoms of heart failure? And what tests are used to diagnose it?

SOB & edema. Sob & edema are typical...Chest x-ray & echocardiogram are usually part of the initial evaluation.
Sob. Shortness of breath, swelling in the feet and possibly the abdomen. Breathing will likely be worse with walking and laying down.
Shortness of breath. The usual symptoms of heart failure include shortness of breath with or without leg swelling -- and the diagnosis is made by a thorough clinical exam and chest x-ray.
Difficulty breathing. Most common sign is shortness of breath but other signs are weight gain , . Swelling of legs and fatigue. Tests used to evaluate for heart failure are chest xray, echo blood test called brain naturetic peptid and examination.