How can you make somebodies heart start beating again if the person had a heart attack or cardiac arrest?

Question: How can you make somebodies heart start beating again if the person had a heart attack or cardiac arrest?
- Keywords:
  beat,
  cardiac,
  heart
Asked by to Del, Catherine, John, Mo Rassul on 19 Mar 2014. This question was also asked by .
- Catherine Mansfield answered on 19 Mar 2014:
  
  The heart normally produces electrical signals which causes it to beat. If the heart has stopped then we can sometimes restart it by applying an electric current to the chest. This can force the cells to go back into a normal rhythm.

Question: How can you make somebodies heart start beating again if the person had a heart attack or cardiac arrest?