Hemodynamic characterization of geometric cerebral aneurysm templates. Issue 11 (26th July 2016)

• Record Type: Journal Article
• Authors: Nair, Priya; Chong, Brian W.; Indahlastari, Aprinda; Lindsay, James; DeJeu, David; Parthasarathy, Varsha; Ryan, Justin; Babiker, Haithem; Workman, Christopher; Gonzalez, L. Fernando; Frakes, David
• Is Part Of: Journal of biomechanics. Volume 49:Issue 11(2016)
• Page Start: 2118
• Page End: 2126
• Publication Date: 2016-07-26
• Subjects: CA cerebral aneurysm -- DS dome size -- DNR dome-to-neck ratio -- PV-CA parent-vessel contact-angle -- WSS wall shear stress -- Vrms root-mean-square velocity magnitude -- CNF cross-neck flow -- CFD computational fluid dynamics -- PIV particle image velocimetry -- IBTA idealized basilar tip aneurysm -- ABTA anatomical basilar tip aneurysm -- SS sum of squares; Cerebral aneurysm -- Geometric template -- Hemodynamics -- Computational fluid dynamics -- Particle image velocimetry; Animal mechanics -- Periodicals; Biomechanics -- Periodicals; Biomechanics -- Periodicals; Mécanique animale -- Périodiques; Biomécanique -- Périodiques; Electronic journals; 571.4305
• DOI: 10.1016/j.jbiomech.2015.11.034
• Languages: English
• ISSNs: 0021-9290

Abstract

Abstract: Hemodynamics are currently considered to a lesser degree than geometry in clinical practices for evaluating cerebral aneurysm (CA) risk and planning CA treatment. This study establishes fundamental relationships between three clinically recognized CA geometric factors and four clinically relevant hemodynamic responses. The goal of the study is to develop a more combined geometric/hemodynamic basis for informing clinical decisions. Flows within eight idealized template geometries were simulated using computational fluid dynamics and measured using particle image velocimetry under both steady and pulsatile flow conditions. The geometric factor main effects were then analyzed to quantify contributions made by the geometric factors (aneurysmal dome size (DS), dome-to-neck ratio (DNR), and parent-vessel contact angle (PV-CA)) to effects on the hemodynamic responses (aneurysmal and neck-plane root-mean-square velocity magnitude ( V rms ), aneurysmal wall shear stress (WSS), and cross-neck flow (CNF)). Two anatomical aneurysm models were also examined to investigate how well the idealized findings would translate to more realistic CA geometries. DNR made the greatest contributions to effects on hemodynamics including a 75.05% contribution to aneurysmal V rms and greater than 35% contributions to all responses. DS made the next greatest contributions, including a 43.94% contribution to CNF and greater than 20% contributions to all responses. PV-CA and several factor interactions also made contributions of greater than 10%. The anatomical aneurysm models and the most similar idealized templates demonstrated consistent hemodynamic response patterns. This study demonstrates how individual geometric factors, and combinations thereof, influence CA hemodynamics. Bridging the gap between geometry and flow in this quantitative yet practical way may have potential to improve CA evaluation and treatment criteria. Agreement among results from idealized and anatomical models further supports the potential for a template-based approach to play a useful role in clinical practice.