What is the appropriate evaluation and management for a pregnant patient presenting with chest pain and T‑wave inversion in the inferior leads?

Chest Pain in Pregnancy with T-Wave Inversion in Inferior Leads

A pregnant patient presenting with chest pain and inferior T-wave inversions requires urgent coronary angiography to differentiate between spontaneous coronary artery dissection (SCAD), coronary vasospasm, and atherosclerotic plaque rupture—the three primary causes of acute coronary syndrome in pregnancy—as management differs fundamentally based on etiology. 1

Initial Risk Stratification

Pregnancy increases acute coronary syndrome risk 3-4 fold compared to age-matched non-pregnant women, with incidence of 3-8 cases per 100,000 deliveries and mortality up to 7% 1. The presentation typically occurs in the third trimester or postpartum period 1.

Critical Historical Features to Elicit

Focus your history on these specific red flags 2, 1:

• Onset pattern: Sudden ripping pain radiating to the back suggests aortic dissection (not gradual anginal buildup)
• Character: Retrosternal pressure/heaviness building over minutes suggests ischemia; sharp pleuritic pain suggests pericarditis
• Timing: Third trimester or postpartum carries highest ACS risk 1
• Pre-existing conditions: Known coronary disease (10% risk of ischemic events in pregnancy), autoimmune disease (lupus, antiphospholipid syndrome increase vasospasm risk) 1, 3
• Smoking history and family history are critical risk factors 4

Diagnostic Workup Algorithm

Immediate Steps (Within Minutes)

1. Serial high-sensitivity cardiac troponins - Essential even with subtle ECG changes 2, 5

2. Complete 12-lead ECG - Inferior T-wave inversions may represent:

   • Acute coronary syndrome (most concerning in pregnancy)
   • Right ventricular involvement from pulmonary embolism 6
   • Coronary steal syndrome 7

3. Echocardiography - Assess for:

   • Regional wall motion abnormalities
   • Left ventricular function
   • Structural abnormalities 3, 8

Definitive Diagnostic Test

Coronary angiography is the gold standard and should be performed urgently if troponins are elevated or clinical suspicion is high 1, 9. This is essential because:

• SCAD is the leading cause of pregnancy-associated MI (cannot be treated with thrombolysis) 1
• Coronary vasospasm is the second most common cause (requires acetylcholine provocation testing for diagnosis) 3
• Atherosclerotic plaque rupture/thrombosis is third (requires different intervention strategy) 1

Use radial artery access to minimize radiation and bleeding risk 9.

Management Based on Angiographic Findings

If STEMI or High-Risk NSTEMI from Atherosclerosis/Thrombosis

• Immediate PCI is preferred over thrombolysis 1
• Do NOT use thrombolysis - coronary dissection is a leading cause in pregnancy and thrombolysis is contraindicated 1
• Antiplatelet therapy: Aspirin 325 mg + clopidogrel 600 mg loading dose 9
• Anticoagulation: Unfractionated heparin preferred over bivalirudin (reserve bivalirudin only for severe heparin allergy) 9
• Revascularization: Balloon angioplasty or bare metal stent preferred 9
• Beta-blocker therapy should be continued 1

If Spontaneous Coronary Artery Dissection (SCAD)

• Conservative management is typically preferred for low-risk presentations 1
• PCI only if high-risk features or ongoing ischemia
• Aspirin and beta-blocker therapy

If Coronary Vasospasm

• Calcium channel blocker (diltiazem 100 mg twice daily is safe during breastfeeding) 3
• ACE inhibitor may be added postpartum (enalapril 2.5 mg once daily safe for breastfeeding) 3
• Avoid beta-blockers alone as they may worsen vasospasm

Critical Pitfalls to Avoid

1. Do not withhold imaging due to pregnancy - ACOG Committee Opinion 656 states radiography should not be withheld from pregnant patients 10. Delayed diagnosis increases maternal and fetal mortality.

2. Do not assume demand ischemia from obstetric complications - Even with concurrent conditions like HELLP syndrome, true ACS must be ruled out with angiography 3

3. Do not dismiss isolated ECG changes as benign variants - Subtle findings with persistent symptoms require full workup including serial troponins 5

4. Do not use thrombolysis as first-line therapy - SCAD is too common in pregnancy and would be catastrophically worsened by thrombolytics 1

Post-Event Management

• Close outpatient cardiology follow-up is mandatory 4
• Multidisciplinary team including cardiology, obstetrics, and maternal-fetal medicine 3
• Future pregnancy counseling - Women with prior pregnancy-associated MI require careful risk stratification before subsequent pregnancies 1