Source-linked AI summary
From Simulation to Suture Lines: Computational Fluid Dynamic Simulation-Guided Baffle Construction for Complex Biventricular Repair
Alexander K. Reed, Elena Sabdy Martinez, Alexander D. Kaiser, Amit Sharir, Caio Carcaioli Bonin, Perry S. Choi, Shiraz A. Maskatia, Alison L. Marsden, Michael R. Ma
TL;DR
The paper applies preoperative CFD to baffle design for biventricular repair, where predicted outflow performance and pressure gradients matter. A semi-automated, area-preserving template was used prospectively, and the implanted baffle showed strong concordance with the plan.
Problem
Baffle design for biventricular septation must account for predicted outflow-tract performance and pressure gradients in the new subaortic anatomy.
Source: Discussion · p. 6Method
The team combined surgeon-defined baffle margins with semi-automated area-preserving geometry and CFD analysis to produce a patient-specific template.
Source: Methods · p. 3, Discussion · p. 6Results
The implanted baffle showed strong concordance with the CFD-guided template.
Source: Results · p. 5, Discussion · p. 6Takeaways & Limitations
An intraoperative template permits implantation of a patch optimized for systole and simplifies baffle construction on the arrested heart.
Source: Discussion · p. 6Future simulations should account for pericardial-patch anisotropic elasticity, cardiac contraction, and baffle dynamics throughout the cardiac cycle.
Source: Discussion · p. 6
Abstract
from arXiv · showhide
Biventricular repair is favored for children with complex double-outlet right ventricle (DORV) to eliminate the long-term morbidity of single ventricle physiology. However, creating a baffle that maintains adequate cross-sectional area while limiting incursion on the tricuspid valve apparatus is challenging in a distorted, arrested heart. Three-dimensional (3D) models have aided baffle design with anatomic visualization but analytic approaches, including computational fluid dynamic (CFD) simulation support, have not yet been incorporated into clinical workflows. We present the preoperative, prospective construction of a DORV repair baffle guided by a semi-automated area-preserving algorithm and CFD analysis.
Corresponding:
The listed topics center on CFD-guided biventricular repair and intraventricular baffle planning for DORV.
Corresponding:
- The topic list links computational fluid dynamics and cardiac simulation with biventricular repair, DORV, and intraventricular baffle planning.Source: Corresponding · p. 2
Methods
The team used patient-specific imaging and surgeon-defined margins to create an area-preserving baffle template, then prepared it for CFD analysis and intraoperative use.
Methods
- A 15-month-old boy with DORV and a subpulmonic VSD was referred for biventricular repair after prior palliation and increasing cyanotic episodes.Source: Methods · p. 3
- End-systolic CTA was segmented into a 3D model, reviewed with the surgeon, and used to define the baffle margins interactively.Segmentation accuracy was confirmed by a pediatric cardiovascular imaging expert.Source: Methods · p. 3
- The patient-specific baffle template maintained a minimum target cross-sectional area of 80.12 mm2, derived from the mean aortic annular diameter for body surface area (10.1mm, Z-score=0, Boston Z-score database).Source: Methods · p. 4
- A 1.25 mm suture-line rim was added before the baffle was extruded, printed in biocompatible resin, sterilized, and marked for orientation.The model was also assessed postoperatively by CTA alignment using VSD and aortic-cap centers and normals, followed by projection of both boundaries onto a shared best-fit plane.Source: Methods · p. 4
Results
The CFD-guided template was closely reproduced during repair, with postoperative imaging showing no significant baffle leak or tricuspid-valve encroachment.
Results
- 4.39 mmHg was the predicted pressure gradient across the computationally planned baffle.Source: Results · p. 4
- Preoperative construction facilitated intraoperative baffle preparation, with no cross-clamp reapplication or patch revision reported.The cross-clamp and cardiopulmonary bypass times were 161 and 306 minutes, respectively.Source: Results · pp. 4–5
- The implanted baffle showed strong concordance with the CFD-guided template, with no significant leak or tricuspid-valve encroachment on postoperative CTA.The peak baffle gradient on POD18 was 2 mmHg, in line with predicted postoperative values.Source: Results · p. 5
- 1.05±0.89 mm was the measured template-to-implant distance, and the implanted baffle perimeter was 99.41 mm, 1.96% below the template.Source: Results · p. 5
Discussion
The planned template and implanted baffle showed strong concordance, while postoperative CTA found no significant leak or tricuspid-valve encroachment. The approach combines semi-automated, area-preserving geometry with CFD and an intraoperative template; future simulations and studies must address model omissions and quantify benefits.
Discussion
- Unlike prior prospective CFD applications in Fontan palliation and aortic reconstruction [3, 4], this is the first reported intracardiac baffle template to directly guide intraoperative construction.Source: Discussion · pp. 5–6
- Modifications to interactive boundary selection [5] enable semi-automated, area-preserving geometry with simulation-ready output.Source: Discussion · p. 6
- Preoperative CFD assesses predicted postoperative left ventricular outflow performance and pressure gradients for clinical acceptability in the new subaortic anatomy.Source: Discussion · p. 6
- The template supports a patch optimized for systole and off-pump construction; reduced cross-clamp duration is a theoretical benefit, given its association with post-cardiotomy shock [6].Source: Discussion · p. 6
- Postoperative CTA showed strong template-to-implant concordance, with no significant baffle leak or tricuspid-valve encroachment.The authors report the postoperative findings as consistent with the CFD-guided template.Source: Discussion · p. 6
- Future simulations should model patch anisotropic elasticity, cardiac contraction, and baffle dynamics; future studies should quantify intra- and postoperative benefits.Source: Discussion · p. 6