#fibrillation.twitch  muscular twitching involving individual muscle fibers acting without coordination
  supertype:  #twitch__twitching__vellication  a sudden spasm; especially one caused by a nervous condition
  subtype:  #atrial_fibrillation  fibrillation of the muscles of the atria of the heart
  subtype:  #ventricular_fibrillation__ventricularfibrillation  fibrillation of heart muscles resulting in interference with rhythmic contractions of the ventricles and possibly leading to cardiac arrest

No statement uses or specializes #fibrillation.twitch; click here to add one.