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Assessment of Vascular Function in Patients With Chronic Kidney Disease
Published on: June 16, 2014
Cardiac disease in chronic uremia: clinical outcome and risk factors
1Division of Nephrology, Memorial University, St John's, Newfoundland, Canada.
Insights
Cardiac disease is a major killer in end-stage renal disease (ESRD). Key risk factors like hypertension, anemia, and hypoalbuminemia contribute to cardiac issues, but many are treatable.
Area of Science:
- Nephrology
- Cardiology
- Internal Medicine
Background:
- Cardiac disease is the leading cause of mortality in end-stage renal disease (ESRD) patients.
- Left ventricular (LV) abnormalities, including hypertrophy and dilatation, are prevalent at dialysis initiation and predict poor outcomes.
- Traditional cardiovascular risk factors have inconsistent associations with cardiac outcomes in ESRD.
Purpose of the Study:
- To identify independent risk factors for cardiac disease in patients initiating renal replacement therapy.
- To investigate the impact of uremic factors on cardiac health.
- To assess the effect of renal transplantation on cardiac abnormalities.
Main Methods:
- A prospective 10-year study involving 433 patients starting renal replacement therapy.
- Analysis of baseline clinical data and cardiac parameters.
- Longitudinal follow-up to assess cardiac outcomes and mortality.
Main Results:
- Hypertension, anemia, and hypoalbuminemia were identified as major independent risk factors for cardiac disease in ESRD.
- Hypertension was associated with LVH, LV dilatation, ischemic heart disease, and cardiac failure.
- Anemia and hypoalbuminemia were linked to LV dilatation, cardiac failure, and increased mortality.
- Renal transplantation significantly improved LV abnormalities, indicating a cardiotoxic uremic environment.
Conclusions:
- Hypertension, anemia, and hypoalbuminemia are significant, modifiable risk factors for cardiac disease in ESRD.
- The uremic environment is cardiotoxic, contributing to cardiac abnormalities and adverse outcomes.
- Interventions targeting these risk factors may reduce the substantial burden of cardiac disease in ESRD patients.
Abstract:
Cardiac disease is common and is the major killer in end-stage renal disease (ESRD). Cardiac failure is a highly malignant condition in ESRD patients. Cardiac failure mediates most of the adverse prognostic impact of ischemic heart disease. Left ventricular (LV) abnormalities are already present at initiation of dialysis therapy in approximately 80% of patients. These abnormalities (ie, systolic dysfunction in approximately 15%, LV dilatation with preserved systolic function in 30%, concentric LV hypertrophy [LVH] in 40%) independently predict ischemic heart disease and cardiac failure, and are the largest baseline predictor of mortality after 2 years on dialysis therapy. The associations between classical risk factors (eg, hyperlipidemia, smoking, hypertension) and cardiac outcomes in ESRD are inconsistent. "Uremic" risk factors represent a nascent, but potentially important field. In our prospective 10-year study of 433 patients starting renal replacement therapy, we identified the following as major independent risk factors for cardiac disease: (1) hypertension (concentric LVH, LV dilatation, ischemic heart disease, cardiac failure, inverse relationship with mortality); (2) anemia (LV dilatation, cardiac failure, death); and (3) hypoalbuminemia (ischemic heart disease, cardiac failure, death). Transplantation dramatically improved LV abnormalities, suggesting that a uremic environment is cardiotoxic. Multiple risk factors act in concert to produce cardiac disease in ESRD; many of these are avoidable, suggesting that the enormous burden of disease can be reduced considerably.
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