According to the Centers for Disease Control and Prevention (CDC) , around one-half of all people diagnosed with congestive heart failure will survive beyond five years. But it is very diffcult to survive with a function of 20%. According to the person and the age it varies. Because if the person is very weak then surviving will be 0 rate because blood flow from the heart slows down. If the function of the heart goes below 50% it causes heart attack. It can be either major or minor.