title: Use of hundreds of electrocardiographic biomarkers for prediction of mortality in postmenopausal women: the Women's Health Initiative.
abstract: 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.
authors.affiliation: Heart and Vascular Institute, Cleveland, OH, USA.
authors.forename: Eiran Z
authors.initials: EZ
authors.lastname: Gorodeski
authors.forename: Hemant
authors.initials: H
authors.lastname: Ishwaran
authors.forename: Udaya B
authors.initials: UB
authors.lastname: Kogalur
authors.forename: Eugene H
authors.initials: EH
authors.lastname: Blackstone
authors.forename: Eileen
authors.initials: E
authors.lastname: Hsich
authors.forename: Zhu-Ming
authors.initials: ZM
authors.lastname: Zhang
authors.forename: Mara Z
authors.initials: MZ
authors.lastname: Vitolins
authors.forename: Joann E
authors.initials: JE
authors.lastname: Manson
authors.forename: J David
authors.initials: JD
authors.lastname: Curb
authors.forename: Lisa W
authors.initials: LW
authors.lastname: Martin
authors.forename: Ronald J
authors.initials: RJ
authors.lastname: Prineas
authors.forename: Michael S
authors.initials: MS
authors.lastname: Lauer
mesh_terms: D000368:Aged; D000465:Algorithms; D015415:Biomarkers / Q000378:metabolism*; D002318:Cardiovascular Diseases / Q000175:diagnosis* / Q000453:epidemiology / Q000401:mortality / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D015233:Models, Statistical; D017698:Postmenopause / Q000502:physiology; D011379:Prognosis; D016019:Survival Analysis; D016387:Women's Health / Q000639:trends
chemical_list: D015415:Biomarkers