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Development and validation of an ankle brachial index risk model for the prediction of cardiovascular events

Fowkes, F. G. R.; Murray, G. D.; Butcher, I.; Folsom, A. R.; Hirsch, A. T.; Couper, D. J.; DeBacker, G.; Kornitzer, M.; Newman, A. B. and Sutton-Tyrrell, K. C., et al. (2014) In European Journal of Preventive Cardiology 21(3). p.310-320
Abstract
Background The ankle brachial index (ABI) is related to risk of cardiovascular events independent of the Framingham risk score (FRS). The aim of this study was to develop and evaluate a risk model for cardiovascular events incorporating the ABI and FRS.



Design An analysis of participant data from 18 cohorts in which 24,375 men and 20,377 women free of coronary heart disease had ABI measured and were followed up for events.



Methods Subjects were divided into a development and internal validation dataset and an external validation dataset. Two models, comprising FRS and FRS + ABI, were fitted for the primary outcome of major coronary events.



Results In predicting events in the external... (More)
Background The ankle brachial index (ABI) is related to risk of cardiovascular events independent of the Framingham risk score (FRS). The aim of this study was to develop and evaluate a risk model for cardiovascular events incorporating the ABI and FRS.



Design An analysis of participant data from 18 cohorts in which 24,375 men and 20,377 women free of coronary heart disease had ABI measured and were followed up for events.



Methods Subjects were divided into a development and internal validation dataset and an external validation dataset. Two models, comprising FRS and FRS + ABI, were fitted for the primary outcome of major coronary events.



Results In predicting events in the external validation dataset, C-index for the FRS was 0.672 (95% CI 0.599 to 0.737) in men and 0.578 (95% CI 0.492 to 0.661) in women. The FRS + ABI led to a small increase in C-index in men to 0.685 (95% CI 0.612 to 0.749) and large increase in women to 0.690 (95% CI 0.605 to 0.764) with net reclassification improvement (NRI) of 4.3% (95% CI 0.0 to 7.6%, p = 0.050) and 9.6% (95% CI 6.1 to 16.4%, p < 0.001), respectively. Restricting the FRS + ABI model to those with FRS intermediate 10-year risk of 10 to 19% resulted in higher NRI of 15.9% (95% CI 6.1 to 20.6%, p < 0.001) in men and 23.3% (95% CI 13.8 to 62.5%, p = 0.002) in women. However, incorporating ABI in an improved newly fitted risk factor model had a nonsignificant effect: NRI 2.0% (95% CI 2.3 to 4.2%, p = 0.567) in men and 1.1% (95% CI 1.9 to 4.0%, p = 0.483) in women.



Conclusions An ABI risk model may improve prediction especially in individuals at intermediate risk and when performance of the base risk factor model is modest. (Less)
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European Journal of Preventive Cardiology
volume
21
issue
3
pages
310 - 320
publisher
SAGE Publications Inc.
external identifiers
  • wos:000331465400006
  • scopus:84896697287
ISSN
2047-4881
DOI
10.1177/2047487313516564
language
English
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yes
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56517f14-afcd-4156-8088-9082389a74f7 (old id 4470251)
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2014-07-01 07:39:30
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2017-08-13 04:12:33
@article{56517f14-afcd-4156-8088-9082389a74f7,
  abstract     = {Background The ankle brachial index (ABI) is related to risk of cardiovascular events independent of the Framingham risk score (FRS). The aim of this study was to develop and evaluate a risk model for cardiovascular events incorporating the ABI and FRS.<br/><br>
<br/><br>
Design An analysis of participant data from 18 cohorts in which 24,375 men and 20,377 women free of coronary heart disease had ABI measured and were followed up for events.<br/><br>
<br/><br>
Methods Subjects were divided into a development and internal validation dataset and an external validation dataset. Two models, comprising FRS and FRS + ABI, were fitted for the primary outcome of major coronary events.<br/><br>
<br/><br>
Results In predicting events in the external validation dataset, C-index for the FRS was 0.672 (95% CI 0.599 to 0.737) in men and 0.578 (95% CI 0.492 to 0.661) in women. The FRS + ABI led to a small increase in C-index in men to 0.685 (95% CI 0.612 to 0.749) and large increase in women to 0.690 (95% CI 0.605 to 0.764) with net reclassification improvement (NRI) of 4.3% (95% CI 0.0 to 7.6%, p = 0.050) and 9.6% (95% CI 6.1 to 16.4%, p &lt; 0.001), respectively. Restricting the FRS + ABI model to those with FRS intermediate 10-year risk of 10 to 19% resulted in higher NRI of 15.9% (95% CI 6.1 to 20.6%, p &lt; 0.001) in men and 23.3% (95% CI 13.8 to 62.5%, p = 0.002) in women. However, incorporating ABI in an improved newly fitted risk factor model had a nonsignificant effect: NRI 2.0% (95% CI 2.3 to 4.2%, p = 0.567) in men and 1.1% (95% CI 1.9 to 4.0%, p = 0.483) in women.<br/><br>
<br/><br>
Conclusions An ABI risk model may improve prediction especially in individuals at intermediate risk and when performance of the base risk factor model is modest.},
  author       = {Fowkes, F. G. R. and Murray, G. D. and Butcher, I. and Folsom, A. R. and Hirsch, A. T. and Couper, D. J. and DeBacker, G. and Kornitzer, M. and Newman, A. B. and Sutton-Tyrrell, K. C. and Cushman, M. and Lee, A. J. and Price, J. F. and D'Agostino Sr., R. B. and Murabito, J. M. and Norman, P. E. and Masaki, K. H. and Bouter, L. M. and Heine, R. J. and Stehouwer, C. D. A. and McDermott, M. M. and Stoffers, H. E. J. H. and Knottnerus, J. A. and Ogren, M. and Hedblad, Bo and Koenig, W. and Meisinger, C. and Cauley, J. A. and Franco, O. H. and Hunink, M. G. M. and Hofman, A. and Witteman, J. C. and Criqui, M. H. and Langer, R. D. and Hiatt, W. R. and Hamman, R. F.},
  issn         = {2047-4881},
  language     = {eng},
  number       = {3},
  pages        = {310--320},
  publisher    = {SAGE Publications Inc.},
  series       = {European Journal of Preventive Cardiology},
  title        = {Development and validation of an ankle brachial index risk model for the prediction of cardiovascular events},
  url          = {http://dx.doi.org/10.1177/2047487313516564},
  volume       = {21},
  year         = {2014},
}