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Updated: Aug 9, 2026
Reduction in Left Ventricular Wall Stress and Improvement in Function in Failing Hearts using Algisyl-LVR
Published on: April 8, 2013
Ventricular radius reduction without resection: a computational analysis
1Department of Surgery, University of Cincinnati, Ohio, USA.
Insights
Geometric remodeling of the left ventricle (LV) using bimeridianal restraint offers a promising alternative to wedge resection. This technique preserves contractile mass and improves stroke volume more effectively than traditional methods.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Cardiac Mechanics
Background:
- Surgical reduction of a dilated left ventricle (LV) by wedge resection can lower wall stress but leads to limited stroke volume improvement and frequent functional deterioration.
- Negative outcomes of wedge resection are attributed to loss of circumference, contractile mass, and myocardial trauma.
Purpose of the Study:
- To evaluate the efficacy of geometric remodeling via bimeridianal restraint as an alternative to wedge resection for dilated left ventricles.
- To computationally analyze the impact of bimeridianal restraint on LV dimensions and projected stroke volume.
Main Methods:
- Bimeridianal restraint involves using two indenting bars to reshape the LV into two "lobes" of reduced radius.
- Computational analysis was performed on dilated LV dimensions from four pretransplant patients.
Main Results:
- A 20% radius reduction was projected using two bars (≤18 mm wide), with minimal epicardial indentation (≤8.3 mm) and outward displacement (≤6.4 mm).
- Geometric remodeling demonstrated significantly greater projected stroke volume improvement compared to resection, with potential increases of 1.36-2.14 times baseline.
Conclusions:
- Geometric remodeling preserves contractile mass and circumferential length, offering complete reversibility and minimal operative trauma.
- The findings support further investigation into implementing mechanical designs for geometric remodeling of the dilated left ventricle.
Abstract:
Reducing a dilated left ventricle's radius by wedge resection lowers wall stress, improving performance. However, compliance falls, stroke volume improvement is limited, and, later, both functional deterioration and serious dysrhythmias are frequent. These all may result from loss of circumference, loss of contractile mass, and myocardial trauma, none of which would occur in geometric remodeling. One specific technique is bimeridianal restraint, which uses two indenting bars to remodel the left ventricle (LV) as two widely communicating "lobes" of reduced radius. Computational analysis of this technique, applied to the dilated ventricular dimensions of four pretransplant patients, showed that 20% radius reduction would be accomplished by two < or =18 mm wide bars, indenting the epicardium < or =8.3 mm with < or =6.4 mm greatest outward displacement. Projected stroke volume (SV) for the subject ventricles was then modeled and compared with projections for resected ventricles. Assuming that equally improved contractile fraction will follow equal radius reduction, however that reduction is accomplished, improvement is dramatic: if postresection remodeling SV were 1.0, 1.2, or 1.5 times baseline, then postgeometric remodeling SV would be 1.36+/-0.06, 1.66+/-0.05, or 2.14+/-0.04 times baseline, respectively. These results, preservation of contractile mass and circumferential length, complete reversibility, and minimal operative trauma, warrant study of implementing mechanical designs.
