Symptomatic coronary-subclavian steal corrected by carotid-subclavian bypass

Area of Science:

• Cardiovascular Surgery
• Interventional Cardiology
• Vascular Surgery

Background:

• Coronary artery bypass grafting (CABG) is a common procedure for treating coronary artery disease.
• Internal mammary artery grafts are frequently used due to their long-term patency rates.
• Complications can arise, necessitating further investigation and intervention.

Observation:

• A patient experienced recurrent angina following a left internal mammary artery-to-left anterior descending coronary artery bypass graft.
• Subtotal stenosis in the proximal left subclavian artery was identified as the cause of reversed flow in the patent internal mammary artery graft.
• This reversed flow resulted in an angiographic 'steal' phenomenon, compromising myocardial perfusion.

Findings:

• The subclavian artery stenosis led to steal phenomenon from the internal mammary artery graft.
• Angina and myocardial ischemia were directly linked to the compromised graft flow.
• Successful reoperation involved multiple bypass procedures, including carotid-subclavian bypass and additional coronary artery bypasses.

Implications:

• Subclavian artery stenosis can critically affect the function of ipsilateral internal mammary artery grafts.
• The 'steal phenomenon' is a significant, albeit rare, complication that can cause myocardial ischemia.
• Comprehensive surgical revascularization, addressing all stenotic lesions, is crucial for symptom relief and improved outcomes in complex cardiovascular cases.