J wave as a rare ECG finding of malignant cardiac arrhythmia

This case study features a 76-year-old female patient diagnosed with ventricular fibrillation (VF) in the emergency department who died after cardiopulmonary resuscitation (CPR). In this case report, the importance of observing J waves in the patient’s electrocardiogram after spontaneous return to circulation was addressed in terms of the risk of arrhythmia.