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Published on: March 26, 2018
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Learning Curve Analysis of Minimally Invasive Mitral Valve Repair
Mohsyn Imran Malik1, Brandon Loshusan1, Michael W A Chu1
1Division of Cardiac Surgery, Department of Surgery, Western University, London, ON, Canada.
Innovations (Philadelphia, Pa.)
|May 22, 2025
Summary
This study shows that achieving optimal minimally invasive mitral valve repair outcomes requires approximately 60-85 cases. Focusing surgical training on repair quality, not just safety, is key for better results.
Area of Science:
- Cardiovascular Surgery
- Surgical Education
- Medical Devices
Background:
- Minimally invasive mitral valve (MV) repair learning curves often lack detailed quality outcome analysis.
- This study addresses the need for comprehensive learning curve assessment in MV repair.
Purpose of the Study:
- To investigate the learning curve for minimally invasive MV repair.
- To focus on clinical outcomes and evidence-based technical failure endpoints.
Main Methods:
- A single surgeon performed 362 MV repairs from 2008-2023.
- Patients were stratified into tertiles; failure defined as residual mitral regurgitation ≥ mild or 30-day composite outcome.
- Cumulative log-likelihood curves analyzed technical failure endpoints.
Main Results:
- Significant trends toward shorter cross-clamp time, cardiopulmonary bypass time, and hospital stay were observed across tertiles.
- Learning curve thresholds were identified at ~60 patients for acceptable regurgitation and ~85 patients for the composite outcome.
- No significant differences in adjusted risk scores were found across tertiles.
Conclusions:
- Optimal minimally invasive MV repair outcomes and durability are achieved around 60-85 cases.
- Surgical training should emphasize achieving optimal repair quality, not solely avoiding complications.
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