Abstract
Background
Intracranial aneurysms at the posterior communicating artery (PCOM) are known to have high rupture rates compared to other locations. We developed and internally validated a statistical model discriminating between ruptured and unruptured PCOM aneurysms based on hemodynamic and geometric parameters, angio-architectures, and patient age with the objective of its future use for aneurysm risk assessment.
Methods
A total of 289 PCOM aneurysms in 272 patients modeled with image-based computational fluid dynamics (CFD) were used to construct statistical models using logistic group lasso regression. These models were evaluated with respect to discrimination power and goodness of fit using tenfold nested cross-validation and a split-sample approach to mimic external validation.
Results
The final model retained maximum and minimum wall shear stress (WSS), mean parent artery WSS, maximum and minimum oscillatory shear index, shear concentration index, and aneurysm peak flow velocity, along with aneurysm height and width, bulge location, non-sphericity index, mean Gaussian curvature, angio-architecture type, and patient age. The corresponding area under the curve (AUC) was 0.8359. When omitting data from each of the three largest contributing hospitals in turn, and applying the corresponding model on the left-out data, the AUCs were 0.7507, 0.7081, and 0.5842, respectively.
Conclusions
Statistical models based on a combination of patient age, angio-architecture, hemodynamics, and geometric characteristics can discriminate between ruptured and unruptured PCOM aneurysms with an AUC of 84%. It is important to include data from different hospitals to create models of aneurysm rupture that are valid across hospital populations.
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Funding
This study was funded by the National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH-NINDS, grant no. R21NS094780).
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The authors declare that they have no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
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This manuscript investigates whether a geometry and flow-based risk assessment could improve our ability to identify aneurysms at risk of rupture from the currently available risk factor-based scoring and practice. The major limitation of this study is the case-control type study design comparing ruptured and unruptured aneurysms, which setting is prone to bias because the geometry and flow conditions of an aneurysm that has ruptured may have been very different before the rupture. In spite of this limitation, the results of this study are highly interesting and contribute significantly to our knowledge on risk factor for aneurysm rupture and demonstrate that a detailed analysis of geometry and flow conditions may help to identify those aneurysms in which aberrant flow conditions will trigger pathological wall remodelling that eventually leads to rupture.
Juhana Frosen
Finland
This article is part of the Topical Collection on Vascular Neurosurgery - Aneurysm
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Detmer, F.J., Chung, B.J., Mut, F. et al. Development of a statistical model for discrimination of rupture status in posterior communicating artery aneurysms. Acta Neurochir 160, 1643–1652 (2018). https://doi.org/10.1007/s00701-018-3595-8
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DOI: https://doi.org/10.1007/s00701-018-3595-8