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Published on: July 18, 2014
Change in First-year Intravascular Ultrasound Results Predicts Adverse Events in Heart Transplant Recipients:
Osamu Seguchi1,2, Babak Azarbal1, James Mirocha3
1Department of Cardiology, Cedars-Sinai Smidt Heart Institute, Los Angeles, CA.
Insights
Intravascular ultrasound can predict adverse events after heart transplantation (HTx). Baseline intimal thickness and changes in plaque volume 1 year post-HTx are key indicators for patient outcomes.
Area of Science:
- Cardiology
- Transplant Medicine
- Medical Imaging
Background:
- Heart transplantation (HTx) is a vital treatment for end-stage heart failure.
- Assessing long-term outcomes after HTx is crucial for patient management.
- This study investigates the predictive value of intravascular ultrasound (IVUS) in the modern HTx era.
Purpose of the Study:
- To re-evaluate if intravascular ultrasound (IVUS) variables can predict adverse events following heart transplantation (HTx).
- To identify specific IVUS measurements associated with poor outcomes in HTx recipients.
Main Methods:
- One hundred HTx recipients with serial IVUS data of the left anterior descending artery were analyzed.
- Follow-up averaged 5.7 years, with a primary endpoint composite of death, major adverse cardiac events, and cardiac allograft vasculopathy.
- IVUS examinations were performed 4-8 weeks and 1 year post-HTx.
Main Results:
- Forty-three patients experienced primary endpoint events.
- Baseline maximal intimal thickness (≥0.64 mm) independently predicted adverse events (HR, 8.24).
- Increased plaque atheroma volume (>1.05 mm³/mm) and intimal thickness (>0.27 mm) at 1 year also independently predicted events (HRs, 2.75 and 2.63, respectively).
Conclusions:
- Intravascular ultrasound parameters are significant predictors of adverse outcomes in heart transplant recipients.
- IVUS measurements, including baseline and changes in intimal thickness and plaque volume, offer valuable prognostic information.
- These IVUS findings may serve as important endpoints in future clinical trials for heart transplantation.
Background:
Heart transplantation (HTx) is an established therapeutic option for patients with advanced heart failure who are refractory to conventional guideline-directed treatments. This study aimed to reassess whether intravascular ultrasound variables could predict adverse events after HTx in the modern era.
Methods:
One hundred primary HTx recipients with available serial intravascular ultrasound examination results of the left anterior descending artery 4-8 wk and 1 y after HTx were enrolled, with an average follow-up duration of 5.7 y. The primary endpoint was a composite of all-cause death, nonfatal major adverse cardiac events, and angiographic cardiac allograft vasculopathy.
Results:
Forty-three patients developed primary endpoints. The baseline maximal intimal thickness was independently associated with the primary endpoint (hazard ratio, 8.24; 95% confidential interval [CI], 3.21-21.21; P < 0.001), and the optimal cutoff value was 0.64 mm. A change in the plaque atheroma volume in a proximal 20-mm segment from the left anterior descending artery bifurcation >1.05 mm 3 /mm (hazard ratio, 2.75; 95% CI, 1.28-5.89; P = 0.009) and a change in the first-year maximal intimal thickness >0.27 mm (hazard ratio, 2.63; 95% CI, 1.05-6.56; P = 0.04) were independent predictors of the primary endpoint 1 y after intravascular ultrasonography.
Conclusions:
The aforementioned important clinical implications of intravascular ultrasound parameters are useful predictors of outcomes, which may be considered endpoints in modern clinical HTx trials.
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