An improved perfusion apparatus for small animal hearts

Area of Science:

• Cardiovascular Physiology
• Pharmacology
• Biomedical Engineering

Background:

• Studying cardiac function in small animals requires specialized equipment for mechanical and electrophysiological assessments.
• Existing methods may limit the ability to perform rapid, multi-agent drug testing on isolated hearts.

Purpose of the Study:

• To describe a new perfusion apparatus designed for comprehensive studies of small animal hearts.
• To enable simultaneous mechanical and electrophysiological measurements with rapid drug application capabilities.

Main Methods:

• The apparatus utilizes a Langendorff perfusion system with individual chambers for solution application.
• Aortic root perfusion pressure is precisely controlled via oxygenating gas (5% CO2 in O2).
• Left ventricular pressure is monitored using a compliant balloon, and epicardial ECGs are recorded with atraumatic electrodes.

Main Results:

• The system successfully maintains heart function for extended periods.
• The multichamber design allows for rapid sequential application of different solutions and drugs.
• High-voltage, noise-free ECG recordings are achievable across the entire epicardium.

Conclusions:

• This perfusion apparatus is suitable for detailed mechanical and electrophysiological studies in small animal hearts.
• Its design facilitates rapid pharmacodynamic analysis through multi-drug application.
• The apparatus supports long-term cardiac function maintenance for comprehensive research.