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.
Keywords: Coronary spasm; acetylcholine provocation test; beta-blocker; ventricular fibrillation.