what are the signs and symptoms of heart failure?
['Shortness of breath (dyspnea) when you exert yourself or when you lie down.', 'Fatigue and weakness.', 'Swelling (edema) in your legs, ankles and feet.', 'Rapid or irregular heartbeat.', 'Reduced ability to exercise.', 'Persistent cough or wheezing with white or pink blood-tinged phlegm.']