electroconvulsive therapy vs electrotherapy

electroconvulsive therapy

noun
  • A biomedical therapy for severely depressed patients in which a brief electric current is sent through the brain of an anesthetized patient. 

electrotherapy

noun
  • The use of electrical energy as a medical treatment. 

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