What is a defined characteristic of Wellens Syndrome?

Wellens Syndrome is characterized by specific electrocardiogram (ECG) findings that indicate critical coronary artery stenosis, particularly of the left anterior descending artery. One of the hallmark features of this syndrome is the presence of deeply inverted T waves in precordial leads, typically V2 and V3. These T wave inversions can be indicative of significant myocardial ischemia, particularly in patients who have a history of chest pain, typically occurring during episodes of angina.

The other options do not represent defining characteristics of Wellens Syndrome. For instance, while the absence of ST elevation might be noted in certain cases, it is not a defining characteristic. Flat ST segments or the presence of ectopic heartbeats are also not features associated with Wellens Syndrome. Instead, it is the deeply inverted T waves that have been most consistently observed and serve as a critical diagnostic marker for this condition, emphasizing the need for further cardiovascular evaluation to prevent potential acute myocardial infarction.