Modeling Human Systemic Arterial Tree with Electric Components in the 1960s and Today

Area of Science:

• Physiological modeling
• Cardiovascular dynamics
• Biomedical engineering

Background:

• Analog and theoretical models were foundational in 1960s physiological studies.
• The relevance of these historical modeling approaches in contemporary research is questioned.

Purpose of the Study:

• To re-evaluate the utility of 1960s analog and physical models in understanding the human body.
• To recreate and validate historical cardiovascular models using modern simulation techniques.

Main Methods:

• Developed an analog computing logic circuit simulation of the arterial tree.
• Reproduced blood flow, pressure, and ballistocardiogram (BCG) waveforms using the recreated model.

Main Results:

• Successfully reproduced waveforms described by Noordergraaf et al. and Westerhof et al., with minor variations.
• Identified potential sources of discrepancies in historical data acquisition (oscillometry sensitivity, component accuracy).

Conclusions:

• The recreated models demonstrate the robustness and accuracy of 1960s theoretical frameworks for cardiovascular dynamics.
• Historical analog and physical models offer enduring value for contemporary physiological research and understanding.