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Predicting coronary heart disease in renal transplant recipients: a prospective study
Didier Ducloux1, Amir Kazory, Jean-Marc Chalopin
1Department of Nephrology and Renal Transplantation, Saint-Jacques Hospital, University of Franche-Comté, Besançon, France. dducloux@chu-besancon.fr
Insights
Cardiovascular risk calculators need validation in kidney transplant patients. Nontraditional factors like C-reactive protein and hyperhomocysteinemia increase ischemic heart disease risk in this population.
Area of Science:
- Nephrology
- Cardiology
- Transplantation Medicine
Background:
- Cardiovascular risk calculators lack validation in renal transplant recipients.
- Ischemic heart disease is a significant concern in this patient group.
- Assessing traditional and nontraditional risk factors is crucial.
Purpose of the Study:
- Determine ischemic heart disease incidence and risk factors in renal transplant recipients.
- Evaluate the Framingham Heart Study risk calculator's relevance in this population.
Main Methods:
- Prospective study of 344 renal transplant recipients without prior vascular disease.
- Coronary events tracked and analyzed against cardiovascular risk factors.
- Framingham Heart Study formula used to assess coronary event risk.
Main Results:
- Follow-up averaged 72 months; 7.8% experienced coronary events.
- C-reactive protein and hyperhomocysteinemia identified as independent risk factors.
- Framingham Heart Study model did not accurately predict overall risk.
Conclusions:
- Nontraditional factors significantly increase ischemic heart disease risk in transplant patients.
- Preventive care must address these nontraditional factors to reduce absolute risk.
- Framingham score underestimates risk in high-risk transplant patients but is accurate for low-risk individuals.
Background:
Current cardiovascular risk calculators, widely used in the general population, have not yet been validated in renal transplant recipients. We conducted a prospective study to determine the incidence and risk factors for ischemic heart disease in renal transplant recipients and to assess the relevance of the Framingham Heart Study risk calculator in this population.
Methods:
Three hundred and forty four consecutive renal transplant recipients free of vascular disease were enrolled. Coronary events were registered and analyzed with respect to traditional and nontraditional cardiovascular risk factors. The risk of coronary events was assessed through the Framingham Heart Study formula and the relevance of this equation was then analyzed.
Results:
The patients were followed for a mean duration of 72 +/- 14 months. Twenty seven coronary events occurred in 27 patients (7.8%). In addition to risk factors included in the Framingham Heart Study score, C-reactive protein (CRP) level (P= 0.009), and hyperhomocysteinemia (P= 0.01) were found to be independent risk factors for ischemic heart disease events in renal transplant recipients. The Framingham Heart Study model did not predict absolute ischemic heart disease risk in the transplant population as a whole.
Conclusion:
Nontraditional cardiovascular risk factors greatly contribute to increased incidence of ischemic heart disease events in renal transplant recipients. They should therefore be considered in preventive care of these patients which relies on reduction of overall absolute risk. Although the Framingham Heart Study score has an excellent predictive value in low-risk renal transplant recipients, it tends to underestimate the real cardiovascular risk in high-risk patients.
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