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Cardioversion is a medical procedure that restores a normal heart rhythm in people with certain types of abnormal heartbeats.
Before the shocks are delivered, a nurse or technician will insert an intravenous (IV) line in your arm. The IV line is used to give you medications that will make you sleep during the procedure so that you won't feel any pain from the shocks. Your doctor may also use the IV line to give you additional medications that can help restore your heart rhythm.
Once you're sedated, electric cardioversion usually only takes a few minutes to complete.
It is conscious sedation, which as the term implies, is sedation without rendering the patient completely unconscious.
The key to sedation during cardioversion is to administer enough medication to prevent recall of the procedure, but not so much that cardiorespiratory function is compromised.