A kind of rapid rhythm disorder causing the contraction of the afflicted part of the heart to be ineffective.
When such rapid rhythm affects the atria, it is called atrial flutter. Its consequences are similar to those of Atrial Fibrillation.
However, if this is found in the ventricles, ventricular flutter is an emergency situation requiring immediate life saving intervention. Without treatment this condition deteriorates to Ventricular Fibrillation and cardiac arrest.