Association of Lipid Core Burden Index With Early Progression of Cardiac Allograft Vasculopathy in Patients After Heart Transplantation
Clinical Snapshot
PICO Framework
| P — Population | 12 consecutive heart transplant recipients undergoing surveillance imaging |
| I — Intervention | Near-infrared spectroscopy-intravascular ultrasound (NIRS-IVUS) measurement of lipid core burden index (LCBI) |
| C — Comparator | Higher versus lower maxLCBI4mm groups (stratified by median of 223) |
| O — Outcomes | Progression of maximal intimal thickness (MIT) during first post-transplant year |
Bottom Line
This small prospective study suggests that lipid core burden measured by NIRS-IVUS at one month post-transplant may predict early cardiac allograft vasculopathy progression. However, the extremely small sample size (n=12) severely limits the reliability and generalisability of these findings. While the concept of using advanced imaging biomarkers for CAV risk stratification is promising, this preliminary study requires validation in much larger, multicentre cohorts before clinical implementation. The lack of statistical detail, absence of confounder adjustment, and missing effect size estimates further limit the clinical utility of these results. Clinicians should continue using established CAV surveillance protocols while awaiting more robust evidence for NIRS-IVUS-guided risk stratification.
Key Findings
P Value: Not reported
Effect Size: Not quantified in abstract
Primary Outcome: Greater progression of maximal intimal thickness in higher maxLCBI4mm group
Nnt Or Sensitivity: Median maxLCBI4mm threshold of 223 for risk stratification
Confidence Interval: Not reported
Clinical Application
Limited by requirement for specialised NIRS-IVUS equipment and expertise Relevant to Australian heart transplant centres; NIRS-IVUS technology available but not routinely used for CAV surveillance under current guidelines Heart transplant recipients undergoing routine surveillance imaging
Abstract
BACKGROUND: The association of the lipid-core burden index (LCBI), measured using near-infrared spectroscopy-intravascular ultrasound (NIRS-IVUS), with early progression of cardiac allograft vasculopathy remains unclear. METHODS AND RESULTS: We prospectively examined 12 consecutive heart transplant recipients who underwent NIRS-IVUS and IVUS. Patients were stratified according to the median maximum LCBI in a 4-mm segment (maxLCBI4 mm) of 223 at 1 month. The magnitude of maximal intimal thickness (MIT) progression was greater in the higher maxLCBI4 mmgroup. CONCLUSIONS: Patients with a higher maxLCBI4 mmat baseline exhibited greater MIT progression during the first post-transplant year.
References
- 1.Otsuka, K., Takenaka, S., Nagai, T., Sato, T., Konishi, T., Tada, A., Hamaya, T., Mori, Y., Takahashi, A., Sasaki, S., Tamano, K., Tamura, T., Kazui, S., Yasui, Y., Kobayashi, Y., Temma, T., Kamiya, K., Wakasa, S., & Anzai, T. (2026). Association of Lipid Core Burden Index With Early Progression of Cardiac Allograft Vasculopathy in Patients After Heart Transplantation. Circulation Journal. https://doi.org/10.1253/circj.CJ-26-0175
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