Direct, remote and combined ischemic conditioning in liver surgery

Area of Science:

• Hepatology
• Surgical Research
• Translational Medicine

Background:

• Liver ischemia-reperfusion injury significantly impacts outcomes after liver resection and transplantation.
• Ischemic conditioning, applied directly or remotely, has demonstrated protective effects in animal models.
• Existing protocols include preconditioning, perconditioning, and postconditioning, differing in timing relative to ischemia.

Purpose of the Study:

• To review the efficacy of various ischemic conditioning protocols in mitigating liver ischemia-reperfusion injury.
• To explore the underlying mechanisms of protection offered by direct and remote ischemic conditioning.
• To assess the clinical applicability and limitations of ischemic conditioning in liver surgery.

Main Methods:

• Review of animal studies investigating direct and remote ischemic conditioning protocols.
• Analysis of proposed mechanisms, including cytokine suppression, adenosine production, and apoptosis reduction.
• Evaluation of clinical trial data on the effectiveness of ischemic conditioning in human liver surgery.

Main Results:

• Animal studies suggest that ischemic conditioning can suppress inflammatory responses and reduce liver cell death.
• Mechanisms involve enhanced hepatoprotective adenosine and modulation of neural and humoral pathways for remote conditioning.
• Clinical evidence shows limited efficacy, with only a morbidity reduction in cirrhotic patients undergoing liver resection.

Conclusions:

• Ischemic conditioning presents a potential strategy for managing liver ischemia-reperfusion injury, supported by preclinical data.
• Current clinical translation is restricted, highlighting a gap between animal findings and human application.
• Further clinical trials with novel protocols and combined approaches are essential for integrating ischemic conditioning into clinical practice.