A microcomputer system for haemodynamic measurements in isolated, working rat hearts

Area of Science:

• Physiology
• Biomedical Engineering
• Computational Biology

Background:

• Assessing hemodynamic variables in isolated working hearts is crucial for cardiovascular research.
• Real-time analysis of cardiac function provides dynamic insights into heart performance.
• Traditional methods for calculating hemodynamic variables can be time-consuming and less precise.

Purpose of the Study:

• To describe the application of an Apple IIe microcomputer system for on-line hemodynamic calculations in an isolated working rat heart model.
• To enable the rapid assessment of hemodynamic variables under controlled changes in preload and afterload.
• To introduce a novel electrogram detection method for accurate cardiac cycle initiation.

Main Methods:

• Utilized an Apple IIe microcomputer with a pre-processor for data acquisition and analysis.
• Continuously calculated key hemodynamic variables including heart rate, pressures, and aortic flow.
• Implemented a new procedure for electrogram detection to synchronize cardiac cycle analysis.

Main Results:

• Successfully performed on-line calculation of hemodynamic variables in an isolated working rat heart.
• Quantified rapid changes in cardiac function in response to alterations in preload and afterload.
• Achieved continuous data printing at intervals as short as 6 seconds.

Conclusions:

• The Apple IIe microcomputer system provides an effective platform for real-time hemodynamic monitoring in isolated working rat hearts.
• This approach allows for precise measurement of cardiac responses to physiological challenges.
• The developed electrogram detection method enhances the accuracy and efficiency of cardiac cycle analysis.