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Published on: November 29, 2024
Diastolic dysfunction and mortality in diabetic patients on hemodialysis: a 4.25-year controlled prospective study
Lerida M A Zaslavsky1, Antonio F Pinotti, Jorge L Gross
1Endocrine Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Brazil.
Insights
Diabetic patients on hemodialysis face higher mortality, primarily from cardiovascular issues. Echocardiographic abnormalities, specifically left ventricular diastolic dysfunction, predict death in these patients.
Area of Science:
- Nephrology
- Cardiology
- Diabetology
Background:
- Patients undergoing hemodialysis have elevated mortality rates, particularly diabetic individuals, often due to cardiovascular complications.
- Diabetes exacerbates cardiovascular risks in hemodialysis patients, necessitating better predictive tools for mortality.
Purpose of the Study:
- To assess the predictive value of echocardiographic abnormalities for mortality in diabetic patients initiating hemodialysis.
- To identify specific echocardiographic patterns associated with increased mortality risk in this population.
Main Methods:
- A 4.25-year prospective study involving 40 diabetic and 28 nondiabetic patients starting hemodialysis.
- Cardiovascular assessment included ECG, myocardial scintigraphy, and M-mode/Doppler echocardiography to evaluate left ventricular diastolic function (LVDD).
- Survival analysis utilized Kaplan-Meier curves and Cox proportional-hazards models to identify mortality predictors.
Main Results:
- Overall mortality was significantly higher in diabetic patients (47.5%) compared to nondiabetic patients (7.1%).
- Pseudonormal and restrictive left ventricular diastolic filling patterns were significant predictors of mortality (HR: 3.2).
- The presence of diabetes itself was also associated with increased mortality risk (HR: 4.7).
Conclusions:
- Left ventricular diastolic dysfunction (LVDD) emerged as the primary predictor of mortality in both diabetic and nondiabetic patients starting hemodialysis.
- Intensified management of cardiovascular risk factors before and during dialysis may improve survival rates for diabetic patients.
- Echocardiographic evaluation of LVDD is crucial for risk stratification in hemodialysis patients, especially those with diabetes.
Abstract:
Among patients on hemodialysis, the mortality rate is higher in individuals with diabetes than in nondiabetic individuals, especially due to cardiovascular causes. The objective of the present study was to evaluate the role of echocardiographic abnormalities to predict mortality in diabetic patients starting hemodialysis. A 4.25-year prospective study was carried out with 40 diabetic and 28 nondiabetic patients starting hemodialysis in five dialysis centers in the metropolitan area of Porto Alegre, Brazil, between August 1996 and June 1999. Cardiovascular status was evaluated based on World Health Organization criteria, resting electrocardiogram (ECG), myocardial scintigraphy (at rest and after dipyridamole administration), and M-mode and Doppler echocardiography. Left ventricular diastolic function was classified into the following filling patterns: normal, impaired relaxation, pseudonormal, or restrictive. The survival rate was analyzed by Kaplan-Meier curves and predictors of death by Cox's proportional-hazards model. At the end of the study, the overall mortality rate was higher in patients with diabetes [19/40 (47.5%)] than in those without diabetes [2/28 (7.1%), P=.0013, log rank test]. Pseudonormal and restrictive filling patterns (HR: 3.2; 95% CI: 1.2-8.8; P=.02) and presence of diabetes (HR: 4.7; 95% CI: 1.03-21.4; P=.04) were associated with mortality. In conclusion, left ventricular diastolic dysfunction (LVDD) was the main predictor of mortality in this cohort of diabetic and nondiabetic patients starting dialysis. Intensive treatment of cardiovascular risk factors before the start of dialysis and during the treatment might reduce the mortality rate in diabetic patients.
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