Related Experiment Videos
The surgical management of allograft coronary disease: a paradigm shift
L W Miller1, T J Donohue, T A Wolford
1Department of Internal Medicine, St. Louis University Health Sciences Center, MO 63110, USA.
Insights
Heart transplant recipients with coronary artery disease now have a new surgical option. Coronary bypass surgery may be viable if coronary flow reserve is normal, offering an alternative to retransplantation.
Area of Science:
- Cardiology
- Cardiac Surgery
- Transplantation Medicine
Background:
- Obstructive coronary artery disease (CAD) in heart allografts is a growing concern for long-term transplant survivors.
- Traditional surgical options like retransplantation offer worse outcomes and are limited by donor availability.
- Previous contraindications for coronary artery bypass grafting (CABG) in allografts stemmed from perceived diffuse disease and lack of runoff.
Purpose of the Study:
- To explore the feasibility of conventional coronary artery bypass grafting (CABG) in heart transplant recipients with allograft coronary disease.
- To evaluate the role of novel diagnostic techniques in identifying suitable candidates for CABG.
Main Methods:
- Utilized Doppler flow wire to measure coronary flow reserve (CFR) and assess physiological vasodilating capacity.
- Identified patients with normal CFR and adequate target epicardial vessels for potential CABG.
- Reviewed pathological findings and discussed alternative interventions like transmyocardial laser revascularization.
Main Results:
- Normal CFR indicates sufficient vasodilating capacity, potentially enabling CABG.
- Presence of adequate target epicardial vessels is crucial for successful bypass surgery.
- This approach offers a viable alternative to retransplantation for select patients.
Conclusions:
- Conventional CABG can be a reasonable surgical option for heart transplant recipients with allograft coronary artery disease.
- Measurement of CFR is a key diagnostic tool to determine eligibility for CABG.
- This strategy expands treatment options, potentially improving survival for patients who would otherwise face limited interventions.
Abstract:
The surgical options for heart transplant recipients who develop obstructive coronary artery disease in their allograft have historically been limited to retransplantation. Given the worse outcome in recipients of second grafts, often caused by recurrence of coronary disease, coupled with the significant increase in the number of patients on the transplantation waiting lists, has made retransplantation a limited option. However, as heart transplant recipients continue to live longer, there are an increasing number of patients who develop allograft coronary disease. Coronary bypass surgery has not been offered to these patients because of numerous pathology reports describing uniform involvement of the coronary vessel from its origin to the distal intramural branches, thereby eliminating any reasonable runoff vascular bed to handle increased flow that might be delivered with bypass conduits. However, new diagnostic techniques such as measurement of coronary flow reserve by Doppler flow wire can define the physiological vasodilating capacity or reserve which, if normal, should allow conventional bypass surgery if adequate target epicardial vessels are present. This approach would allow a more reasonable alternative to many patients who otherwise would die of this disease without any intervention. Other alternatives such as transmyocardial laser revascularization are discussed.