IPA: /ˌkɑːrdiəʊˈvɜːrʒən/
KK: /kɑrdiəˈvɜrʒən/
A medical procedure used to restore a normal heartbeat by applying an electrical shock or using medication.
The doctor recommended cardioversion to treat the patient's irregular heartbeat.
Cardioversion is formed from "cardio-" (from Greek "kardia", meaning heart) and "version" (from Latin "versio", meaning turning). The term refers to the process of turning or restoring the heart to a normal rhythm.
Think of 'heart' ('cardio-') being 'turned' or restored ('version') to its normal rhythm — that's what cardioversion means.