Why heart attack is dangerous ?
A sudden change in the heart’s signaling causes sudden cardiac arrest. A heart attack increases the risk of this life-threatening condition. It can lead to death (sudden cardiac death) without immediate treatment, so heart attack is dangerous.
What happens during heart attack?
Your heart muscle needs oxygen to survive. A heart attack occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. View an animation of blood flow between the heart and lungs.