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Thromb Haemost 2022; 122(01): 142-150
DOI: 10.1055/a-1467-2993
Stroke, Systemic or Venous Thromboembolism

Improving Stroke Risk Prediction in the General Population: A Comparative Assessment of Common Clinical Rules, a New Multimorbid Index, and Machine-Learning-Based Algorithms

Gregory Y. H. Lip 
1   Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart and Chest Hospital, Liverpool, United Kingdom
,
Ash Genaidy
2   Anthem Inc., Indianapolis, Indiana, United States
,
George Tran
3   IngenioRX, Indianapolis, Indiana, United States
,
Patricia Marroquin
2   Anthem Inc., Indianapolis, Indiana, United States
,
Cara Estes
2   Anthem Inc., Indianapolis, Indiana, United States
,
Sue Sloop
2   Anthem Inc., Indianapolis, Indiana, United States
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Abstract

Background There are few large studies examining and predicting the diversified cardiovascular/noncardiovascular comorbidity relationships with stroke. We investigated stroke risks in a very large prospective cohort of patients with multimorbidity, using two common clinical rules, a clinical multimorbid index and a machine-learning (ML) approach, accounting for the complex relationships among variables, including the dynamic nature of changing risk factors.

Methods We studied a prospective U.S. cohort of 3,435,224 patients from medical databases in a 2-year investigation. Stroke outcomes were examined in relationship to diverse multimorbid conditions, demographic variables, and other inputs, with ML accounting for the dynamic nature of changing multimorbidity risk factors, two clinical risk scores, and a clinical multimorbid index.

Results Common clinical risk scores had moderate and comparable c indices with stroke outcomes in the training and external validation samples (validation—CHADS2: c index 0.812, 95% confidence interval [CI] 0.808–0.815; CHA2DS2-VASc: c index 0.809, 95% CI 0.805–0.812). A clinical multimorbid index had higher discriminant validity values for both the training/external validation samples (validation: c index 0.850, 95% CI 0.847–0.853). The ML-based algorithms yielded the highest discriminant validity values for the gradient boosting/neural network logistic regression formulations with no significant differences among the ML approaches (validation for logistic regression: c index 0.866, 95% CI 0.856–0.876). Calibration of the ML-based formulation was satisfactory across a wide range of predicted probabilities. Decision curve analysis demonstrated that clinical utility for the ML-based formulation was better than that for the two current clinical rules and the newly developed multimorbid tool. Also, ML models and clinical stroke risk scores were more clinically useful than the “treat all” strategy.

Conclusion Complex relationships of various comorbidities uncovered using a ML approach for diverse (and dynamic) multimorbidity changes have major consequences for stroke risk prediction. This approach may facilitate automated approaches for dynamic risk stratification in the significant presence of multimorbidity, helping in the decision-making process for risk assessment and integrated/holistic management.

Keywords

machine learning - cardiovascular/noncardiovascular multimorbidity - stroke

Data Availability

Data are available as presented in the article. According to U.S. laws and corporate agreements, our own approvals to use the Anthem and IngenioRx data sources for the current study do not allow us to distribute or make patient data directly available to other parties.


The review process for this paper was fully handled by Christian Weber, Editor in Chief.


Supplementary Material



Publication History

Received: 19 March 2021

Accepted: 23 March 2021

Accepted Manuscript online:
25 March 2021

Article published online:
28 May 2021

© 2021. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

Comment to this article:

A New Paradigm of “Real-Time” Stroke Risk Prediction and Integrated Care Management in the Digital Health Era: Innovations Using Machine Learning and Artificial Intelligence ApproachesThromb Haemost 2022; 122(01): 005-007
DOI: 10.1055/a-1508-7980

 

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