asequence vs dysrhythmia

asequence

noun
  • Synonym of arrhythmia 

  • Synonym of dyssynchrony 

dysrhythmia

noun
  • A disturbance to an otherwise normal biological rhythm, especially that of the heart. 

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