palpitation vs pulsing

palpitation

noun
  • An abnormal beating of the heart that may be perceived by the patient, a result of excitement, exertion, or illness. 

pulsing

noun
  • The action of something that pulses. 

  • The emission of pulses. 

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