The de Winter electrocardiographic pattern of proximal left anterior descending occlusion.

Prompt recognition of electrocardiographic signs of acute left anterior descending (LAD) occlusion is essential for timely restoration of flow. However, some patients may present with atypical electrocardiographic signs, and early diagnosis of these patients may constitute a clinical challenge. Here, we report two cases presenting with an atypical electrocardiographic manifestation despite angiographically confirmed acute thrombotic occlusion of proximal LAD. These cases highlight the importance of recognizing the de Winter electrocardiogram pattern in cases of suspected acute myocardial infarction (AMI). An emergency percutaneous coronary intervention (PCI) should be performed in suspected AMI patients as early as possible.