Enhancing outcomes in Langendorff-perfused rodent hearts through perfusion parameter optimization.

Area of Science:

• Cardiovascular Physiology
• Translational Research Models

Background:

• Cardiovascular diseases (CVDs) show a concerning lack of progress, with increasing mortality in certain groups due to aging and obesity.
• Current research models like cell lines lack biological accuracy, while animal models present excessive complexity.
• Ex vivo perfusion of isolated rodent hearts offers a balance, providing biological accuracy with reduced complexity.

Purpose of the Study:

• To demonstrate the versatility of ex vivo heart perfusion protocols for diverse experimental needs.
• To evaluate the impact of varying perfusion parameters on isolated heart function and homeostasis.
• To assess the efficacy of different perfusate compositions and pressures in maintaining cardiac health.

Main Methods:

• Utilizing ex vivo perfusion of isolated rodent hearts.
• Manipulating perfusion parameters including perfusate composition, flow rate, and coronary pressures.
• Assessing cardiac function through left ventricular (LV) pressures and evaluating organ damage and inflammation.

Main Results:

• Physiological perfusion pressures increased LV pressures but led to functional decline, suitable for organ assessment.
• Lower perfusion pressures maintained function over longer periods, ideal for extended experiments.
• Adenosine reduced edema and inflammation, while packed red blood cells induced inflammation and damage, especially at low pressures.

Conclusions:

• Ex vivo heart perfusion is a valuable tool for studying direct cardiac responses to stimuli.
• Perfusion pressure selection should be tailored to experimental duration and objectives.
• Perfusate choice significantly impacts cardiac outcomes, with adenosine showing protective effects and red blood cells causing adverse effects.