Loop isolation-based uploading preconditioning to protect heart from damage: a proof-of-concept study

Area of Science:

• Cardiovascular Surgery
• Cardiac Anesthesia
• Myocardial Protection

Background:

• Limited understanding of indirect clamp releasing in coronary artery bypass grafting (CABG).
• Investigating the efficacy of a modified loop isolation-based uploading preconditioning (LiuPhD) strategy for myocardial protection.
• Examining the potential of LiuPhD to attenuate reperfusion injury following global myocardial ischemia.

Purpose of the Study:

• To evaluate the impact of the LiuPhD strategy on post-bypass times and myocardial protection during CABG.
• To compare the safety and efficacy of LiuPhD with conventional direct clamp releasing in CABG patients.

Main Methods:

• Post-hoc comparative analysis of a prospective single-arm trial versus a historical cohort.
• Inclusion of 60 multivessel-disease patients undergoing elective on-pump CABG using the LiuPhD strategy.
• 1:1 propensity score matching with historical controls from the same center.

Main Results:

• The LiuPhD group demonstrated significantly shorter post-bypass times (10 vs. 14 minutes; p=0.003).
• No significant difference in composite cardiac-specific interventions was observed between groups (38/60 vs. 44/60; p=0.29).
• Similar risk for major adverse cardiac and cerebrovascular events was found at follow-up (82.3% vs. 73.8% event-free survival).

Conclusions:

• The LiuPhD strategy is associated with reduced post-bypass times in CABG surgery.
• This modified preconditioning method provides comparable myocardial injury risk and overall safety to conventional direct clamp releasing.
• LiuPhD represents a potentially beneficial alternative for myocardial protection during CABG.