The Critical Diagnostic Trap
A 54-year-old male presents to the DMCH emergency room with a history of severe retrosternal squeezing chest pain that began two hours earlier while walking upstairs. By the time he reaches the triage physician, his chest pain has completely resolved.
His vitals are stable, and initial cardiac troponin levels return normal. An electrocardiogram is obtained while the patient is pain-free.
[!WARNING] Do NOT discharge or exercise-stress this patient! Wellens syndrome represents severe, critical proximal Left Anterior Descending (LAD) coronary artery stenosis that can progress to massive anterior wall myocardial infarction within days.
The Two Wellens ECG Patterns
Type A: Biphasic T Waves (25% of cases)Type A
- Prominent biphasic T waves in leads V2 and V3 (initial positivity followed by sharp terminal negativity).
- Seen during the pain-free interval following an acute ischemic episode.
Type B: Deep, Symmetrical T-Wave Inversions (75% of cases)Type B
- Deep, symmetric, inverted T waves in precordial leads V1 through V4 (and occasionally V5-V6).
- Often misdiagnosed as non-specific repolarization abnormalities or past ischemia.
Diagnostic Criteria Checklist
| Criterion | Clinical Requirement |
|---|---|
| 1. T-Wave Morphology | Deeply inverted or biphasic T-waves in V2-V3 (often V1-V4) |
| 2. Symptom Status | ECG recorded during a PAIN-FREE interval |
| 3. ST-Segment Elevation | Absent or minimal (<1 mm) |
| 4. Pathologic Q Waves | No precordial Q-waves preserved R-wave progression |
| 5. Cardiac Biomarkers | Normal or minimally elevated cardiac enzymes |
Management Pitfalls: Why Exercise Stress Testing is Contraindicated
Performing an exercise treadmill test (ETT) in patients with Wellens syndrome can trigger acute thrombotic occlusion of the critical proximal LAD lesion, causing refractory ventricular tachycardia, cardiogenic shock, or sudden cardiac death.
Correct Strategy: Admit directly for telemetry monitoring, start dual antiplatelet therapy and anticoagulation, and expedite urgent coronary angiography.