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Related Experiment Videos

Coronary microvascular endothelial dysfunction in transplanted children.

M Giulia Gagliardi1, F Crea, B Polletta

  • 1Paediatric Cardiology, Bambino Gesù Hospital, Rome, Italy.

European Heart Journal
|February 13, 2001
PubMed
Summary

Endothelial dysfunction in heart transplant recipients worsens over time, impacting coronary microcirculation. This progression is linked to longer follow-up periods and may inform strategies to prevent arteriosclerosis.

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Area of Science:

  • Cardiology
  • Pediatric Cardiology
  • Transplantation Medicine

Background:

  • Endothelial dysfunction is a risk factor for cardiovascular disease.
  • Assessing coronary microcirculation is crucial for monitoring heart transplant recipients.
  • Time-dependent changes in endothelial function post-transplant require investigation.

Purpose of the Study:

  • To evaluate coronary microcirculation response to acetylcholine and adenosine in pediatric heart transplant recipients.
  • To determine if endothelial dysfunction is time-dependent after heart transplantation.
  • To compare endothelial function between transplanted children and controls.

Main Methods:

  • Studied 26 asymptomatic pediatric heart transplant recipients and 10 controls.
  • Assessed coronary blood flow velocity using Doppler wire during intracoronary infusions.

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  • Administered acetylcholine (endothelium-dependent) and adenosine (endothelium-independent) vasodilators.

    • Main Results:

    • Transplanted children showed a blunted response to acetylcholine (peak/baseline ratio=1.17+/-0.22) compared to controls (1.76+/-0.73).
    • The acetylcholine response was inversely correlated with follow-up duration (r=-0.50; P=0.0078).
    • No significant difference in adenosine response was observed between groups (3.75+/-1.54 vs. 3.72+/-1.34).

    Conclusions:

    • Paediatric heart transplant recipients exhibit endothelial dysfunction.
    • This dysfunction becomes more pronounced with longer follow-up periods.
    • Findings may aid in preventing accelerated arteriosclerosis in these patients.