Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Heart Attack ?
    ### Response:
    If You Have Symptoms, Call 9-1-1 Diagnosis and treatment of a heart attack can begin when emergency personnel arrive after you call 9-1-1. Do not put off calling 9-1-1 because you are not sure that you are having a heart attack. Call within 5 minutes of the start of symptoms.
    