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Development and Validation of a Simple-to-Use Nomogram for Predicting 5-, 10-, and 15-Year Survival in Asymptomatic Adults Undergoing Coronary Artery Calcium Scoring

Authors
 Bríain Ó Hartaigh  ;  Heidi Gransar  ;  Tracy Callister  ;  Leslee J. Shaw  ;  Joshua Schulman-Marcus  ;  Wijnand J. Stuijfzand  ;  Valentina Valenti  ;  Iksung Cho  ;  Jackie Szymonifka  ;  Fay Y. Lin  ;  Daniel S. Berman  ;  Hyuk-Jae Chang  ;  James K. Min 
Citation
 JACC-CARDIOVASCULAR IMAGING, Vol.11(3) : 450-458, 2018 
Journal Title
JACC-CARDIOVASCULAR IMAGING
ISSN
 1936-878X 
Issue Date
2018
Keywords
all-cause mortality ; coronary artery calcium scoring ; nomogram ; prediction
Abstract
OBJECTIVES: The purpose of this study was to develop and validate a simple-to-use nomogram for prediction of 5-, 10-, and 15-year survival among asymptomatic adults.

BACKGROUND: Simple-to-use prognostication tools that incorporate robust methods such as coronary artery calcium scoring (CACS) for predicting near-, intermediate- and long-term mortality are warranted.

METHODS: In a consecutive series of 9,715 persons (mean age: 53.4 ± 10.5 years; 59.3% male) undergoing CACS, we developed a nomogram using Cox proportional hazards regression modeling that included: age, sex, smoking, hypertension, dyslipidemia, diabetes, family history of coronary artery disease, and CACS. We developed a prognostic index (PI) summing the number of risk points corresponding to weighted covariates, which was used to configure the nomogram. Validation of the nomogram was assessed by discrimination and calibration applied to a separate cohort of 7,824 adults who also underwent CACS.

RESULTS: A total of 936 and 294 deaths occurred in the derivation and validation sets at a median follow-up of 14.6 years (interquartile range: 13.7 to 15.5 years) and 9.4 years (interquartile range: 6.8 to 11.5 years), respectively. The developed model effectively predicted 5-, 10-, and 15-year probability of survival. The PI displayed high discrimination in the derivation and validation sets (C-index 0.74 and 0.76, respectively), indicating suitable external performance of our nomogram model. The predicted and actual estimates of survival in each dataset according to PI quartiles were similar (though not identical), demonstrating improved model calibration.

CONCLUSIONS: A simple-to-use nomogram effectively predicts 5-, 10- and 15-year survival for asymptomatic adults undergoing screening for cardiac risk factors. This nomogram may be considered for use in clinical care.
Files in This Item:
T201804709.pdf.pdf Download
DOI
10.1016/j.jcmg.2017.03.018
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Chang, Hyuk-Jae(장혁재) ORCID logo https://orcid.org/0000-0002-6139-7545
Cho, Ik Sung(조익성)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/166798
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