Surgeon Experience and Outcomes: Specific, Analogy-Based and Cumulative Learning in Cardiac Surgery

Area of Science:

• Cardiac Surgery Outcomes
• Surgical Learning Curves
• Medical Education

Background:

• Surgical proficiency is critical for patient outcomes in complex procedures.
• Understanding how surgeons learn and improve is essential for optimizing training and practice.
• Cardiac surgery, including coronary artery bypass graft (CABG), aortic valve replacement (AVR), and mitral valve reconstruction (MVR), involves intricate techniques where learning plays a vital role.

Purpose of the Study:

• To evaluate the impact of specific learning mechanisms on surgical outcomes in CABG, AVR, and MVR.
• To investigate the influence of procedure-specific learning, analogy-based learning, and cumulative experience on patient safety and efficiency.
• To identify factors contributing to improved performance in high-volume cardiac procedures.

Main Methods:

• Analysis of 21,269 cardiac surgeries (CABG, AVR, MVR) performed by 46 surgeons between 2010 and 2023 in Germany.
• Surgical outcomes assessed using 30-day risk-adjusted mortality rate (RAMR) and risk-adjusted re-thoracotomy rate (RARR), adjusted with EuroSCORE II.
• Linear regression models employed to examine the association between learning mechanisms (procedure-specific volume, analogy-based learning, cumulative experience) and surgical outcomes.

Main Results:

• Increased procedure-specific volume in the prior quarter significantly lowered 30-day RAMR for CABG (0.49% decrease; P=0.014).
• Analogy-based learning showed cross-procedural effects for CABG, with prior volumes of related procedures (AVR, MVR) impacting RAMR.
• Greater cumulative experience significantly reduced RARR for MVR (P=0.028), while no significant volume-outcome associations were found for AVR.

Conclusions:

• Consistent, procedure-specific surgical practice is crucial for enhancing outcomes in cardiac surgery.
• Accumulating experience and leveraging analogy-based learning contribute to improved patient safety and reduced complications.
• Optimizing surgical training and practice patterns can lead to better results in CABG and MVR procedures.