noun
commotio cordis; cardiac concussion
Medical term for a rare, often fatal disruption of heart rhythm caused by a blunt, non-penetrating blow to the chest at a critical moment in the cardiac cycle.
心臓震盪は、胸部への衝撃が心臓のリズムを乱すことで起こる。
Commotio cordis occurs when a blow to the chest disrupts the heart's rhythm.
Compound of 心臓 (heart) and 震盪 (concussion, shock). The term is a direct medical borrowing, likely calqued from Western medical terminology.