A life-saving procedure involving pressing the chest to manually support the heart's function during cardiac arrest (typically refers to chest compressions).
救急隊が到着するまで近くにいた人たちが心臓マッサージを続けた。
People nearby continued cardiac massage until the ambulance arrived.
最近は心臓マッサージより胸骨圧迫という言い方のほうが一般的だ。
Nowadays the term 'chest compression' is more commonly used than 'cardiac massage'.