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  1. What is Heart Failure? - American Heart Association

  2. Heart failure - Symptoms and causes - Mayo Clinic

  3. Congestive Heart Failure: Symptoms, Stages & Treatment - Cleveland Clinic

  4. Understanding Heart Failure -- the Basics - WebMD

  5. About Heart Failure | Heart Disease | CDC - Centers for Disease

  6. Heart Failure - What Is Heart Failure? - NHLBI, NIH

  7. Types of Heart Failure - American Heart Association

  8. What is heart failure? - Heart Foundation

  9. Heart Failure: Symptoms, Causes, and Types - Healthline

  10. Heart Failure - American Heart Association