Left Ventricular Hemodynamics: Pre versus Post Mitral Valve Prolapse Repair

Area of Science:

• Cardiovascular Medicine
• Biomedical Engineering
• Medical Imaging

Background:

• Mitral valve prolapse (MVP) is a common valvular heart disease affecting 2-3% of US adults.
• Impaired mitral valve closure leads to regurgitation and impacts left ventricular (LV) function.
• Surgical interventions like mitral valve repair (MVRe) or replacement (MVRp) are definitive but require understanding hemodynamic effects.

Purpose of the Study:

• To investigate the impact of MVRe on LV hemodynamics, specifically diastolic filling vortices and pumping efficiency.
• To evaluate changes in LV flow patterns and cardiac remodeling post-MVRe using patient-specific modeling.
• To correlate LV hemodynamic characteristics with diastolic and systolic functional indices after MVRe.

Main Methods:

• Utilized a pipeline combining cine cardiac magnetic resonance imaging (CMR) and phase-contrast MRI (PC-MRI).
• Developed patient-specific fluid-structure interaction (FSI) models of the LV.
• Analyzed LV flow patterns, vortices, and volumetric kinetic energy in one MVP patient before and after MVRe.

Main Results:

• A reduction in the number of LV vortices was observed post-MVRe.
• Changes in LV volumetric kinetic energy were noted after mitral valve repair.
• The study demonstrated alterations in LV hemodynamic characteristics following MVRe.

Conclusions:

• FSI modeling of LV hemodynamics pre- and post-MVRe provides valuable insights into cardiac remodeling.
• Understanding these hemodynamic changes can aid in optimizing surgical design for MVP.
• This approach holds promise for improving outcomes in mitral valve surgery for MVP patients.