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Assessment of QT Interval and QT Dispersion for Prediction of All-Cause and Cardiovascular Mortality in American Indians: The Strong Heart Study
Open accessAbstract
Background —Both a prolonged QT interval and increased QT interval dispersion (QTD) have been proposed as surface ECG markers of vulnerability to ventricular arrhythmias and potential predictors of mortality. Methods and Results —The predictive values of QT prolongation and QTD were assessed in 1839 participants in the Strong Heart Study, a prospective study of cardiovascular disease in American Indians. ECGs were acquired at 250 Hz; QT intervals were measured by computer in all 12 leads and corrected for heart rate (QTc) by use of Bazett’s formula. QTD was calculated as the difference between the maximum and minimum QTc. After a mean follow-up of 3.7±0.9 years, there were 188 deaths from all causes, including 55 cardiovascular deaths. In univariate Cox analyses, prolonged QTc and increased QTD were significant predictors of all-cause mortality (χ 2 =53.0, P <0.0001; χ 2 =11.3, P =0.0008) and cardiovascular mortality (χ 2 =14.7, P =0.0001; χ 2 =26.5, P <0.0001). In multivariate Cox regression analyses controlling for risk factors, QTc remained a strong predictor of all-cause mortality (χ 2 =16.5, P <0.0001) and a weaker predictor of cardiovascular mortality (χ 2 =5.8, P =0.016); QTD remained a significant predictor of cardiovascular mortality only (χ 2 =12.5, P =0.0004). Conclusions —These findings support the value of computerized measurements of QTc and QTD in noninvasive risk stratification and suggest that these surface ECG variables may reflect different underlying abnormalities of ventricular repolarization.
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Cites
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Prolonged QTc Interval and Risk of Sudden Cardiac Death in a Population of Older Adults
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Measurement, interpretation and clinical potential of QT dispersion
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A common genetic variant in the NOS1 regulator NOS1AP modulates cardiac repolarization
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Coronary heart disease risk equivalence in diabetes depends on concomitant risk factors
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Self-citationRecovery of Heart Rate Variability and Ventricular Repolarization Indices Following Exercise
Lahiri, M. K., Chicos, A., Bergner, D., Ng, J., Banthia, S., Wang, N. C., Subačius, H., Kadish, A. H., & Goldberger, J. J. (2012) · Annals of Noninvasive Electrocardiology · doi:10.1111/j.1542-474x.2012.00527.x · Cited by 18
Metadata
- Authors
- Okin, P. M., Devereux, R. B., Howard, B. V., Fabsitz, R. R., Lee, E. T., & Welty, T. K.
- Venue
- Circulation
- Published
- 2000-01-04
- Volume
- 101
- Issue
- 1
- Pages
- 61-66
- ISSN
- 0009-7322 (ISSN-L)
- 1524-4539
- OpenAlex
- W1966545986
- Cited by
- 381
- References
- 30
- FWCI
- 12.46
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Okin, P. M., Devereux, R. B., Howard, B. V., Fabsitz, R. R., Lee, E. T., & Welty, T. K. (2000). Assessment of QT Interval and QT Dispersion for Prediction of All-Cause and Cardiovascular Mortality in American Indians: The Strong Heart Study. Circulation. https://doi.org/10.1161/01.cir.101.1.61
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