Wellens Syndrome
Definition
Wellens syndrome (Wellens T-wave pattern, pre-infarction pattern) is a specific ECG pattern characterized by deeply inverted T waves (>0.5 mV) in leads V2–V4 with significant QT prolongation, occurring after resolution of chest pain without ECG evidence of evolving infarction (no significant STE, no new Q waves, preserved R-wave progression). It represents a warning sign of critical stenosis of the proximal left anterior descending coronary artery with collateral circulation, and identifies patients at high short-term risk of anterior STEMI.
Key Concepts
ECG Diagnostic Criteria
- Deeply inverted T waves (>0.5 mV) in V2–V3–V4, occasionally V5
- Significant QT prolongation
- Pattern appears during a pain-free period, after resolution of chest pain
- No significant ST-segment elevation (does not meet STEMI criteria)
- No new pathological Q waves; R-wave progression typically preserved
- (sources/ecg-ischemia-aha-2009, rating: very high)
Underlying Pathophysiology
- Proximal LAD critical stenosis with collateral circulation; during pain, near-transmural ischemia occurs; with reperfusion/collateral flow, ischemia partially resolves but T-wave inversion persists
- Deep inversions reflect post-ischemic repolarization abnormality ("stunned" myocardium) rather than active transmural ischemia; TP/PQ baseline injury current is no longer present but repolarization heterogeneity persists
- If the culprit stenosis progresses to complete occlusion without intervention, extensive anterior STEMI results (sources/ecg-ischemia-aha-2009, rating: very high)
Prognosis and Clinical Significance
- If unrecognized and untreated, a high proportion of patients proceed to acute anterior STEMI from proximal LAD occlusion (de Zwaan/Bär/Wellens 1982 series)
- Pattern is clinically dangerous precisely because patients are pain-free and appear stable; stress testing is contraindicated (may precipitate occlusion)
- AHA 2009 recommendation: interpret this ECG pattern as consistent with severe proximal LAD stenosis and evaluate/treat urgently (sources/ecg-ischemia-aha-2009, rating: very high)
Differential Diagnosis
- Intracranial hemorrhage (CVA pattern): Identical deep T-wave inversions with QT prolongation in V2–V4; clinically differentiated by history, neuroimaging, and troponin pattern
- Giant T-wave inversion (>1.0 mV) entities: Hypertrophic cardiomyopathy, NSTEMI, neurological events — these are the three recognized causes of giant T-wave inversion per AHA classification (sources/ecg-sttu-aha-2009, rating: high)
- NSTEMI: T-wave inversions may look similar but usually occur in a different clinical context (ongoing ischemia with troponin elevation vs. post-ischemic pain-free state)
Relationship to OMI Paradigm
- Wellens pattern = recognized OMI-equivalent ECG finding not captured by standard STEMI criteria
- Represents one of the high-risk T-wave change patterns that expert interpreters and AI systems (PMCardio Queen of Hearts) use to identify culprit occlusion; see concepts/OMI-NOMI-Paradigm
- The standard STEMI criteria activated pathway fails to capture Wellens patients because ST elevation is absent at the time of presentation
Contradictions / Open Questions
- Mechanism of T-wave inversion (stunned myocardium, post-ischemic repolarization, or reperfusion) is not definitively established
- Original data from de Zwaan/Bär/Wellens (1982) predates high-sensitivity troponin, modern PCI, and systematic angiographic correlation; applicability to all modern ACS presentations is extrapolated
- No large multicenter prospective validation using contemporary imaging or hs-troponin; prevalence and reproducibility of pattern recognition in emergency settings is unknown
Connections
- Related to concepts/ST-T-Changes — T-wave pathology in post-ischemic state
- Related to concepts/OMI-NOMI-Paradigm — recognized OMI-equivalent beyond STEMI criteria
- Related to concepts/Hyperacute-T-waves — complementary acute T-wave pattern in early LAD occlusion
- Related to concepts/Cardiac-Repolarization — mechanism of post-ischemic T-wave inversion
- Related to concepts/Sgarbossa-Criteria — LBBB ischemia recognition (parallel OMI ECG toolkit)