We describe the case of a 46-year-old woman who was initially diagnosed with ST-elevation myocardial infarction. After percutaneous coronary intervention, she sustained cardiac arrests due to recurrent pulseless electrical activity and required repeated cardiopulmonary resuscitation. Venoarterial extracorporeal membrane oxygenation was initiated for hemodynamic stabilization while the cause was being investigated. A complete electrocardiogram later suggested coronary vasospasm as the most likely cause, and the patient was treated accordingly. After treatment, the patient recovered without adverse sequelae.