Beyond Wellens' Syndrome: Two Cases of Dynamic Electrocardiographic (ECG) Changes in Critical Left Anterior Descending Coronary Artery (LAD) Occlusion.

Wellens' syndrome represents a high-risk electrocardiographic (ECG) manifestation of critical left anterior descending coronary artery (LAD) disease, characterized by dynamic T-wave changes that may evolve over time and precede extensive anterior myocardial infarction. In this report, we describe two patients with critical LAD disease who presented with dynamic ECG changes consistent with different Wellens' syndrome patterns, highlighting the variability of this condition. The first was a 68-year-old male patient who presented with chest pain and dyspnea. His initial ECG showed transient ST-segment elevation in the anterior leads, which later evolved into biphasic T waves, consistent with a Wellens' type A pattern. The second patient, a 62-year-old man, presented with acute chest pain and diaphoresis. Early ECG changes included transient ST-segment elevation, followed by the development of deep T-wave inversions in the precordial leads, consistent with a Wellens' type B pattern. In both cases, cardiac biomarkers were elevated, while ECG findings were either subtle or non-diagnostic in the early phase. Coronary angiography confirmed critical LAD involvement, and both patients underwent successful percutaneous coronary intervention.