Percutaneous mitral valve dilatation: single balloon versus double balloon. A finite element study

Area of Science:

• Cardiovascular Engineering
• Biomedical Simulation
• Interventional Cardiology

Background:

• Percutaneous mitral valve (MV) dilatation is a standard treatment for mitral stenosis.
• Both single balloon (SB) and double balloon (DB) techniques are employed.

Purpose of the Study:

• To compare the efficacy of SB and DB techniques for MV dilatation using finite element (FE) analysis.
• To evaluate stress distribution and commissural splitting in simulated mitral stenosis.

Main Methods:

• A validated FE model of the MV was adapted to simulate stenosis (orifice area 180 mm²).
• FE models for a 30 mm SB and an 18 mm DB system were developed.
• Simulations assessed valve area changes and induced stresses.

Main Results:

• Both SB and DB techniques successfully relieved stenosis, increasing MV area (SB: 610 mm², DB: 560 mm²).
• The DB technique demonstrated more uniform stress distribution and effectively split fused commissures.
• The SB technique induced higher stress, particularly at the commissures, and had less success in splitting fused commissures.

Conclusions:

• FE modeling confirms both SB and DB techniques can achieve MV dilatation.
• The DB technique offers a higher likelihood of successful commissural splitting.
• DB may reduce the risk of MV leaflet damage from overstretching compared to SB.