Clinical Scorecard: Case Study: An Emerging Etiology for ST-Segment Elevation in Lead aVR

At a Glance

Key Highlights

• ST-segment elevation in lead aVR can indicate extracoronary vascular lesions.
• Left subclavian artery stenosis can compromise LIMA graft flow.
• Inter-arm blood pressure differences can aid in diagnosis.
• Percutaneous intervention can resolve symptoms and ECG changes.
• Coronary-subclavian steal syndrome complicates 0.2% to 6.8% of LIMA graft cases.

Guideline-Based Recommendations

Diagnosis

• Consider extracoronary vascular lesions in post-CABG patients with unexplained ischemia.
• Evaluate inter-arm systolic blood pressure differences.

Management

• Perform angiography to assess for proximal inflow disease.
• Consider percutaneous transluminal angioplasty for significant stenosis.

Monitoring & Follow-up

• Regular ECG monitoring for ST-segment changes post-intervention.
• Monitor cardiac biomarkers for signs of ischemia.

Risks

• Risk of coronary-subclavian steal syndrome in patients with LIMA grafts.
• Potential for misdiagnosis if proximal lesions are overlooked.

Patient & Prescribing Data

74-year-old male with a history of coronary artery disease and CABG.

Endovascular treatment of left subclavian artery stenosis can rapidly alleviate symptoms.

Clinical Best Practices

• Maintain a high index of suspicion for proximal inflow disease in post-CABG patients.
• Utilize comprehensive imaging techniques to assess graft and native artery patency.

References

• Case Study Source