Ventricular Fibrillation in a Patient with Multi-Vessel Coronary Spasm Four Days after the Initiation of an Oral Beta-blocker

We describe a case of ventricular fibrillation occurring in a patient with multi-vessel coronary spasm after the initiation of an oral beta-blocker. A 56-year-old man began to experience chest discomfort and his computed tomography revealed intermediate coronary stenoses. He was administered medications including an oral beta-blocker but suddenly collapsed while walking 4 days later. An automated external defibrillator detected ventricular fibrillation and delivered successful electrical cardioversion. An acetylcholine provocation test after stabilization of the status revealed triple-vessel coronary spasm. Beta-blockers may provoke exacerbation of coronary spasm and result in lethal arrhythmia. LEARNING POINTS: Beta-blockers which have a vasoconstrictive effect may occasionally provoke exacerbation of coronary spasm. Coronary spasm should be considered as a cause of lethal ventricular arrhythmia or cardiac arrest.