In an adult patient presenting with intermittent right sternal‑border chest pain and T‑wave inversion in lead III and V2, what is the appropriate immediate cardiac work‑up and management?

Immediate Cardiac Work-Up and Management

Obtain a 12-lead ECG within 10 minutes, measure high-sensitivity cardiac troponin immediately with results within 60 minutes, initiate continuous cardiac monitoring, and repeat ECGs if symptoms recur or within 90 minutes if initial ECG is nondiagnostic—this presentation requires urgent evaluation for acute coronary syndrome (ACS) with particular attention to Wellens' syndrome, posterior STEMI, or right ventricular involvement. 1, 2

Critical Initial Actions (First 10-60 Minutes)

ECG Acquisition and Interpretation

• Obtain 12-lead ECG within 10 minutes of presentation and have it interpreted immediately by an experienced physician 1, 2
• T-wave inversion in V2 with right sternal border pain raises multiple high-risk possibilities:
  • Wellens' syndrome: Biphasic or deeply inverted T-waves in V2-V3 indicate critical proximal LAD stenosis (95-99% occlusion) and impending extensive anterior MI 3, 4
  • Posterior STEMI: ST-depression in anteroseptal leads (V1-V3) may represent evolving posterior STEMI—obtain posterior leads (V7-V9) 1, 2
  • Right ventricular involvement: The T1T2T3/III pattern (T-wave inversion maximal in V1-V3 and lead III) may indicate pulmonary embolism with RV strain rather than ACS 5

Additional ECG Leads

• Obtain right-sided leads (V3R, V4R) if inferior involvement suspected 2
• Obtain posterior leads (V7-V9) given V2 changes with right sternal border location 1, 2

Laboratory Testing

• Measure high-sensitivity cardiac troponin immediately with results available within 60 minutes 2
• Use the 0h/1h algorithm with repeat troponin at 1 hour if available, or 0h/2h algorithm as alternative 2
• If initial two measurements inconclusive but clinical suspicion remains high, obtain additional testing at 3 hours 2
• Measure D-dimer given the differential of pulmonary embolism with the T1T2T3/III pattern 5, 6

Continuous Monitoring

• Initiate continuous rhythm AND ST-segment monitoring immediately 2, 7
• Admit to monitored unit 2
• Continue monitoring until ACS established or ruled out—intermittent ST-elevations may occur asymptomatically and be missed on routine 12-lead ECGs 7

Serial ECG Strategy

This is critical and often overlooked:

• Repeat ECG during any recurrent chest pain 1, 2
• Repeat ECG within 90 minutes if initial ECG nondiagnostic, as 11% of STEMI patients have initially nondiagnostic ECGs, and 72.4% show diagnostic changes within 90 minutes 1
• A nondiagnostic ECG does not rule out ACS—electrocardiographic abnormalities are dynamic 1
• Compare all ECGs to prior tracings 1

Risk Stratification Based on ECG Findings

High-Risk Scenario: Wellens' Syndrome

If T-wave changes in V2 are biphasic or deeply inverted during a pain-free period:

• This represents pre-infarction stage with critical proximal LAD stenosis 3, 4
• Do NOT perform stress testing—this can precipitate extensive anterior MI 4
• Urgent cardiology consultation and coronary angiography required regardless of troponin levels 3, 4
• Even if troponins are normal initially, this pattern mandates invasive evaluation 4

Alternative Diagnosis: Pulmonary Embolism

If T-wave inversion is maximal in V1-V3 AND lead III (T1T2T3/III pattern):

• Consider CT pulmonary angiography if D-dimer elevated and clinical features support PE 5, 6
• Check for deep vein thrombosis 6
• Echocardiography may show RV strain without LV regional wall motion abnormalities 6

Posterior STEMI Consideration

If ST-depression in V1-V3 with right sternal border pain:

• Obtain posterior leads immediately 1, 2
• If posterior STEMI confirmed, manage as STEMI equivalent with goal FMC-to-device time ≤90 minutes 1

Imaging

• Echocardiography to evaluate regional and global LV function, rule out differential diagnoses, and assess for RV involvement 2
• If troponin and ECG remain normal/inconclusive but suspicion persists, coronary CTA is recommended as alternative to invasive angiography for low-to-intermediate likelihood CAD 2

Common Pitfalls to Avoid

1. Dismissing isolated T-wave changes: Even subtle, isolated T-wave inversion in the setting of ongoing ischemic symptoms may represent early MI 8
2. Performing stress testing in Wellens' syndrome: This can precipitate extensive MI—recognize the pattern and proceed directly to angiography 4
3. Assuming normal initial troponin rules out ACS: Troponins may be normal early in Wellens' syndrome; the ECG pattern during pain-free period is diagnostic 3, 4
4. Missing intermittent ST-elevations: Continuous ST-segment monitoring detects asymptomatic transient elevations missed by routine ECGs 7
5. Anchoring on ACS when PE is the diagnosis: The T1T2T3/III pattern with elevated troponin can mimic ACS but represents RV strain from PE 5, 6

Immediate Management Pending Work-Up

• Aspirin, antiplatelet therapy, and anticoagulation if ACS suspected and no contraindications 2
• Avoid stress testing until high-risk ACS excluded 4
• Maintain NPO status pending potential urgent catheterization
• Cardiology consultation should occur early given the high-risk ECG patterns possible with this presentation