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Cardiac allograft vasculopathy--coronary interventions and surgical options
K Pethig1, B Heublein, A Haverich
1Department of Thoracic and Cardiovascular Surgery, Div. of Surgery, Hannover Medical School, 30623 Hannover, Germany. Klaus.Pethig@t-online.de
Insights
Stent implantation effectively treats obstructive allograft vasculopathy after heart transplantation, offering a high success rate and low restenosis. Coronary artery bypass grafting is an alternative for select patients.
Area of Science:
- Cardiology
- Transplantation Medicine
- Interventional Cardiology
Background:
- Obstructive allograft vasculopathy is a primary cause of late mortality after heart transplantation.
- Previous angioplasty (PTCA) for this condition yielded disappointing results due to significant early recoil.
- Intravascular ultrasound identified extensive early recoil as the main driver of restenosis in dilated lesions.
Purpose of the Study:
- To evaluate the efficacy of stent implantation as a therapeutic alternative for focal luminal obstruction in graft coronary arteries.
- To compare stent implantation outcomes with existing treatments for obstructive allograft vasculopathy.
Main Methods:
- A single-center study involving 41 patients with 75 treated lesions using 85 stents.
- Patients were managed with aspirin (ASS) and Ticlopidine.
- Follow-up included control angiography at 6 months.
Main Results:
- Stent implantation achieved a 98% success rate with no observed acute or subacute stent thromboses.
- The 6-month restenosis rate was 14.1%, establishing stent implantation as a preferred method for focal obstruction.
- Coronary artery bypass grafting (CABG) is a potential alternative for carefully selected patients unsuitable for interventional therapy.
Conclusions:
- Stent implantation is a highly effective treatment for focal luminal obstruction in graft coronary arteries post-heart transplantation.
- The procedure demonstrates a favorable success rate and low restenosis, making it the method of choice.
- Coronary artery bypass grafting remains a viable option for specific patient subsets not amenable to interventional procedures.
Abstract:
Despite improved results early after heart transplantation (HTX) obstructive allograft vasculopathy still remains the leading cause of death late after HTX. Studies in the past, focused on angioplasty (PTCA), presented with disappointing results. Using intravascular ultrasound an extensive early recoil could be shown to be the major cause for re/rest-stenosis in dilated lesions. Stimulated by these observations, stent implantation was recently shown to be an effective therapeutical alternative in focal luminal obstruction in graft coronary arteries. Treatment of 41 patients in a single center experience (75 lesions, 85 stents) resulted in a success rate of 98%; no acute or subacute stent thromboses were observed (protocol with ASS and Ticlopidine). Control angiography revealed a 6-month restenosis rate of 14.1% defining stent implantation as the method of choice for relief of focal luminal obstruction. Only limited experience is available regarding the surgical approach with coronary artery bypass grafting. In selected patients (focal obstruction not suitable for interventional therapy, adequate peripheral vessels) it might represent a therapeutical alternative.