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Cardiac arrest is sometimes preceded by certain symptoms such as fainting, fatigue, blackouts, dizziness, chest pain, shortness of breath, weakness, and vomiting. The arrest may also occur with no warning.
Increased heart rate when you stand up from a resting position. You see, your heart pumps blood to the brain when it beats. If there's a sudden and dramatic increase in pulse rate, not enough blood gets to the brain and you get dizzy. So the increase in pulse and dizziness upon standing are key for diagnosis.