This can happen in two ways, either the heart's ventricles can't pump blood hard enough during systole, called systolic heart failure, or not enough blood fills the ventricles during diastole, called diastolic heart failure.

这可能以两种方式发生：一种是心室在心脏收缩期不能足够有力地泵出血液，即收缩性心力衰竭；另一种是在心脏舒张期心室充盈不足，即舒张性心力衰竭。