The underlying mechanism in the majority of such patients has been related to coronary spasm, including in those with amphetamine abuse, in whom the coronary arteriogram was always found normal.

• 而且大部分病例中，其发生的机转与冠状动脉痉挛有关，包括安非他命滥用者，其冠状动脉摄影通常都是正常。