[Myocardial protection during transplantation procedure following cold storage in Collins' solution]

Area of Science:

• Cardiology
• Transplantation Medicine
• Biochemistry

Background:

• Myocardial protection during heart transplantation is critical for graft survival.
• Collins' solution is a traditional preservation fluid, but its efficacy during the reperfusion phase is debated.
• The study investigates whether the intra-procedural ischemic time extends cold storage effects.

Purpose of the Study:

• To evaluate the myocardial protective effects of a novel cardioplegic solution versus Collins' solution during heart transplantation.
• To compare the functional recovery and biochemical markers of hearts preserved with two different solutions.

Main Methods:

• Utilized an isolated working rat heart model.
• Compared a novel cardioplegic solution (Group I) against Collins' solution (Group II).
• Assessed functional recovery (cardiac output), coronary vascular resistance, and creatine phosphokinase (CPK) release after 30 minutes of global ischemia at 25°C following 2 hours of cold storage.

Main Results:

• Group I showed significantly better functional recovery (% cardiac output: 61.1% vs. 42.4%, p<0.01).
• Group II exhibited elevated coronary vascular resistance and higher CPK release during reperfusion (1.92 IU vs. 0.41 IU, p<0.01).
• No significant differences were observed in myocardial metabolite content or energy charge between groups.

Conclusions:

• Collins' solution is detrimental to ischemic myocardium during the transplantation procedure, even after cold storage.
• The novel cardioplegic solution offers superior myocardial protection compared to Collins' solution.
• Findings suggest a need to re-evaluate preservation strategies in heart transplantation.