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Coronary Microvascular Dysfunction Predicts Long-Term Outcome in Simultaneous Pancreas-Kidney Transplantation.

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Coronary flow reserve (CFR) below 2 in simultaneous pancreas-kidney transplant (SPKT) patients may indicate major adverse cardiac events (MACE). However, this risk appears to decrease over time post-transplant, suggesting improved cardiovascular health.

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Area of Science:

  • Cardiology
  • Transplantation Medicine
  • Nephrology

Background:

  • Patients with diabetes face heightened cardiovascular risks.
  • Simultaneous pancreas-kidney transplantation (SPKT) is the preferred treatment for type 1 diabetes with diabetic nephropathy.
  • Coronary flow reserve (CFR) assessed via echocardiography can serve as a marker for major adverse cardiac events (MACE) in SPKT recipients.

Purpose of the Study:

  • To evaluate coronary flow reserve (CFR) as a predictor of major adverse cardiac events (MACE) in patients undergoing simultaneous pancreas-kidney transplantation (SPKT).
  • To investigate the relationship between abnormal CFR and the incidence of MACE in SPKT patients.
  • To assess the influence of time since transplantation on the predictive value of CFR for MACE.

Main Methods:

  • A study of 48 consecutive SPKT patients (mean age 54 ± 8 years) with a follow-up of 4.6 ± 1.8 years.
  • Coronary flow velocity in the left anterior descending artery was measured using Doppler echocardiography at rest and during adenosine infusion.
  • Coronary flow reserve (CFR) was calculated as the ratio of hyperemic to resting diastolic flow velocity; a CFR ≤ 2 indicated coronary microvascular dysfunction and was considered abnormal.

Main Results:

  • The average CFR was 2.55 ± 0.8, with 27% of patients exhibiting an abnormal CFR (≤ 2).
  • SPKT patients who experienced MACE had a significantly lower CFR (2.1 ± 0.7 vs. 2.7 ± 0.8, P = .03) and a higher incidence of CFR ≤ 2.
  • An abnormal CFR (≤ 2) was associated with lower MACE-free survival (P = .03) and independently predicted MACE risk, although this predictive power diminished when adjusted for time from transplantation.

Conclusions:

  • A CFR of 2 or less may serve as a reliable indicator of MACE in SPKT recipients, independent of coronary artery disease.
  • The predictive significance of an abnormal CFR for MACE appears to decrease over time following transplantation.
  • These findings suggest a potential gradual reduction in cardiovascular risk among SPKT patients as time from transplantation increases.