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Elevated temporal QT variability index in patients with chronic renal failure
Mats Johansson1, Sinsia A Gao, Peter Friberg
1Department of Clinical Physiology, Sahlgrenska University Hospital, Göteborg, Sweden. m.johansson@medfak.gu.se
Clinical Science (London, England : 1979)
|August 20, 2004
Summary
Patients with chronic renal failure (CRF) exhibit increased cardiac repolarization lability, indicated by a higher QT variability index (QTVI). This heightened QTVI is linked to diabetes and coronary artery disease, increasing sudden death risk in CRF patients.
Area of Science:
- Cardiology
- Nephrology
- Medical Diagnostics
Background:
- Chronic renal failure (CRF) patients face elevated cardiovascular disease risks, with sudden death accounting for 60% of mortality.
- Abnormalities in myocardial repolarization are implicated in ventricular arrhythmia risk.
Purpose of the Study:
- To assess the temporal QT variability index (QTVI) as a measure of myocardial repolarization lability in CRF patients.
- To identify factors associated with QTVI in the CRF population.
Main Methods:
- ECGs were recorded from 153 CRF patients (hemodialysis, peritoneal dialysis, conservative treatment) and 39 healthy controls.
- QTVI was calculated using the logarithm of the ratio between normalized QT and RR interval variances.
- Multiple linear regression analysis identified independent predictors of QTVI.
Main Results:
- CRF patients showed a 47% increase in QTVI compared to healthy subjects (P<0.01).
- QTVI was significantly higher in CRF patients with diabetes compared to non-diabetic patients (P<0.01).
- Diabetes and coronary artery disease were independent predictors of elevated QTVI in CRF patients.
Conclusions:
- Elevated QTVI in CRF patients is associated with diabetes and coronary artery disease.
- Repolarization instability, as indicated by QTVI, may contribute to ventricular arrhythmia and sudden death in CRF.
- QTVI serves as a potential biomarker for cardiovascular risk in chronic renal failure.