Safe evolution towards routine off-pump coronary artery bypass: negotiating the learning curve

Area of Science:

• Cardiovascular Surgery
• Surgical Outcomes
• Minimally Invasive Procedures

Background:

• Off-pump coronary artery bypass (OPCAB) aims to reduce morbidity associated with cardiopulmonary bypass.
• Concerns exist regarding the technical difficulty and learning curve associated with OPCAB adoption.
• This study examines patient selection trends during a surgeon's transition to routine OPCAB.

Purpose of the Study:

• To analyze the evolution of patient selection in OPCAB surgery over time.
• To assess clinical outcomes during the learning curve of a single surgeon adopting OPCAB.
• To determine the feasibility of routine OPCAB in isolated coronary artery bypass grafting (CABG).

Main Methods:

• Prospective data collection and retrospective review of 1479 consecutive isolated CABG patients (10/1/96 - 12/31/01).
• Examination of trends in OPCAB adoption versus conventional CABG with cardiopulmonary bypass.
• Analysis of patient characteristics and outcomes in both OPCAB and on-pump groups.

Main Results:

• The practice shifted from 90% conventional CABG to 93% OPCAB.
• Mortality was lower in the OPCAB group (1.0%) compared to the on-pump group (2.1%).
• Initial OPCAB excluded patients with depressed ejection fraction, left main disease, or complex three-vessel disease, with criteria expanding as experience grew.

Conclusions:

• Routine OPCAB can be achieved with good patient outcomes, despite a learning curve.
• Advancements in surgical techniques and devices facilitate OPCAB application for most CABG candidates.
• Careful patient selection is crucial for maintaining acceptable outcomes during the OPCAB learning phase.