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  1. Heart attack - Symptoms & causes - Mayo Clinic

  2. 7 Early Signs of a Heart Attack - Cleveland Clinic Health Essentials

  3. Warning Signs of a Heart Attack | American Heart Association

  4. Heart attack symptoms: Know what's a medical emergency

  5. Ataque cardíaco - Síntomas y causas - Mayo Clinic

  6. Heart Attack: Causes, Symptoms, and Treatment - WebMD

  7. Warning Signs of a Heart Attack

  8. Symptoms of a heart attack - NHS

  9. Heart attack - symptoms, signs, complications and treatments

  10. About Heart Attack Symptoms, Risk, and Recovery