#cardiac_arrhythmia__cardiacarrhythmia__arrhythmia  an abnormal rate of muscle contractions in the heart
  supertype:  heart_disease__heartdisease__heart_condition__heartcondition__cardiopathy  a disease of the heart
  subtype:  flutter  abnormally rapid beating of the auricles of the heart (especially in a regular rhythm); can result in heart block
  subtype:  gallop_rhythm__cantering_rhythm__canteringrhythm  cardiac rhythm characterized by the presence of an extra sound; can indicate a heart abnormality
  subtype:  atrial_fibrillation  fibrillation of the muscles of the atria of the heart
  subtype:  bradycardia  abnormally slow heartbeat
  subtype:  heart_block__Adams-Stokes_syndrome__Stokes-Adams_syndrome__atrioventricular_block  recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat
  subtype:  premature_ventricular_contraction__prematureventricularcontraction__pvc  irregularity of cardiac rhythm; recurrent occurrences can be a precursor of ventricular fibrillation
  subtype:  tachycardia  abnormally rapid heartbeat (over 100 beats per minute)
  subtype:  ventricular_fibrillation__ventricularfibrillation  fibrillation of heart muscles resulting in interference with rhythmic contractions of the ventricles and possibly leading to cardiac arrest

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