Use of hundreds of electrocardiographic biomarkers for prediction of mortality in postmenopausal women the women's health initiative

Eiran Z. Gorodeski, Hemant Ishwaran, Udaya B. Kogalur, Eugene H. Blackstone, Eileen Hsich, Zhu Ming Zhang, Mara Z. Vitolins, Jo Ann E. Manson, J. David Curb, Lisa W. Martin, Ronald J. Prineas, Michael S. Lauer

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Background-Simultaneous contribution of hundreds of electrocardiographic (ECG) biomarkers to prediction of long-term mortality in postmenopausal women with clinically normal resting ECGs is unknown. Methods and Results-We analyzed ECGs and all-cause mortality in 33 144 women enrolled in the Women's Health Initiative trials who were without baseline cardiovascular disease or cancer and had normal ECGs by Minnesota and Novacode criteria. Four hundred and seventy-seven ECG biomarkers, encompassing global and individual ECG findings, were measured with computer algorithms. During a median follow-up of 8.1 years (range for survivors, 0.5 to 11.2 years), 1229 women died. For analyses, the cohort was randomly split into derivation (n=22 096; deaths, 819) and validation (n=11 048; deaths, 410) subsets. ECG biomarkers and demographic and clinical characteristics were simultaneously analyzed using both traditional Cox regression and random survival forest, a novel algorithmic machine-learning approach. Regression modeling failed to converge. Random survival forest variable selection yielded 20 variables that were independently predictive of long-term mortality, 14 of which were ECG biomarkers related to autonomic tone, atrial conduction, and ventricular depolarization and repolarization. Conclusions-We identified 14 ECG biomarkers from among hundreds that were associated with long-term prognosis using a novel random forest variable selection methodology. These biomarkers were related to autonomic tone, atrial conduction, ventricular depolarization, and ventricular repolarization. Quantitative ECG biomarkers have prognostic importance and may be markers of subclinical disease in apparently healthy postmenopausal women.

Original languageEnglish (US)
Pages (from-to)521-532
Number of pages12
JournalCirculation: Cardiovascular Quality and Outcomes
Issue number5
StatePublished - Sep 2011
Externally publishedYes


  • Electrocardiography
  • Epidemiology
  • Prognosis
  • Women

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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