heart failure vs syncopation

heart failure

noun
  • The cessation of the heartbeat; cardiac arrest. 

  • The chronic inability of the heart to pump a sufficient amount of blood throughout the body, leading to a pooling of blood and shortness of breath. 

syncopation

noun
  • The quality of a rhythm being somehow unexpected, in that it deviates from the strict succession of regularly spaced strong and weak beats in a meter. 

  • The contraction of a word by means of loss or omission of sounds or syllables in the middle thereof. 

How often have the words heart failure and syncopation occurred in a corpus of books? (source: Google Ngram Viewer )