It's common man simile ! But not true in reality ! Heart has three arteries feeding it . With each attack , one artery is believed to b blocking ; so with the third attack , all three are presumably blocked and hence survival is dufficult . read more
Heart attack is condition where blood supply to heart is reduced/hampered. After first attack a part of heart muscle starts to die due to ischemia ( lack of blood supply). After recovery( without any surgical intervention) rest of the heart beats normally but there is dead muscle still present. read more
Your heart is muscle than needs a constant supply of oxygen, which is brought by blood. If a vessel gets blocked, the muscle doesn't get enough oxygen and starts to die. That is a heart attack. After the heart attack, the muscle can partly recover, but immediately after the heart attack, the heart is still weak. read more