What is cardio version?

Electric shock. That is used to revert your heart to a regular rhythm.
Jolt of electricity. Cardioversion varies from life threatening emergency conditions in cases of ventricular fibrillation - called "defibrillation"-cases of cardiac arrest - to semi elective situations for conditions such as atrial fibrillation. In all such cases, the goal is to jolt your heart with an electric shock to re-establish a normal "sinus" rhythm.
Procedure . This is a procedure for patients suffering from an abnormal heart rhythm such as atrial fibrillation. An electrical impulse is used to momentarily stop the heart. The hope is when the heart starts up again it will be in a normal rhythm. .