Evolution of Minimally Invasive Coronary Artery Bypass Grafting: Learning Curve

Area of Science:

• Cardiovascular Surgery
• Minimally Invasive Techniques
• Surgical Outcomes

Background:

• Coronary artery bypass grafting (CABG) is a standard treatment for coronary artery disease.
• Minimally invasive CABG offers potential benefits over traditional sternotomy.
• Reproducibility and optimization of minimally invasive CABG are crucial for widespread adoption.

Purpose of the Study:

• To evaluate the safety and reproducibility of minimally invasive coronary surgery (MICS) CABG for multivessel revascularization.
• To analyze a single surgeon's experience with MICS CABG over a decade.
• To identify factors influencing operative time, number of bypasses, and conversion rates to sternotomy.

Main Methods:

• Prospective review of 700 consecutive MICS CABG procedures performed by a single surgeon (2005-2013).
• Comparison of early (1-200) versus late (201-700) cases to assess learning curve effects.
• Propensity Score Matching analysis to control for patient and procedural variables.
• Standardized anterolateral left thoracotomy approach for vessel harvesting and anastomoses.

Main Results:

• The number of bypasses per patient increased significantly from 2.3 to 2.7 (P < 0.0001) in later cases.
• Conversion to sternotomy decreased dramatically from 6% to 0.6% (P < 0.0001).
• Prolonged intubation rates decreased (10% to 5%, P = 0.0236), and length of stay was shortened (P = 0.0268).

Conclusions:

• Increasing surgical experience refines the technique for MICS CABG, optimizing outcomes.
• MICS CABG is a safe and reproducible procedure for multivessel revascularization.
• The learning curve for MICS CABG leads to improved efficiency and reduced complications.