also: カウンタショック
noun
countershock
Medical term for the application of an electric shock to the heart to restore normal rhythm, typically in defibrillation or cardioversion.
心室細動の患者にカウンターショックを行った。
Countershock was performed on the patient with ventricular fibrillation.
除細動 is the Japanese term for defibrillation, while カウンターショック is the borrowed English term used in medical contexts.
電気ショック is a broader term for electric shock, not limited to medical cardiac treatment.
Borrowed from English 'countershock', a medical term coined in the mid-20th century.