Numerical analysis of hemodynamic effect under different enhanced external counterpulsation (EECP) frequency for
Siwei Ye1, Ming Yang1, Yuanfei Zhu1
1Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.
Insights
Increasing the frequency of enhanced external counterpulsation (EECP) significantly boosts cerebral blood flow (CBF) in patients with cerebrovascular diseases. Higher EECP frequencies offer a safer approach to improving brain perfusion by optimizing blood flow dynamics.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Neurology
Background:
- Enhanced external counterpulsation (EECP) is known to reduce cardiac load and improve cerebral perfusion in patients with cerebrovascular diseases.
- However, elevated cerebral blood flow (CBF) can be linked to increased blood pressure and potential complications.
- Optimizing EECP parameters, such as frequency, is crucial for maximizing therapeutic benefits while minimizing risks.
Purpose of the Study:
- To investigate the impact of varying EECP frequencies on cerebral blood flow (CBF) perfusion in patients with cerebrovascular diseases.
- To evaluate the effectiveness of different EECP frequencies using a lumped parameter model (LPM) of the human circulatory system.
Main Methods:
- A lumped parameter model (LPM) incorporating cardiopulmonary circulation and eight systemic blood flow units with a cerebral autoregulation module was established.
- Hemodynamic simulations were performed using differential equations to analyze parameters under four EECP modes.
- The pressure frequency of EECP was systematically adjusted while other influencing parameters remained constant.
Main Results:
- Compared to traditional sequential EECP, increasing EECP frequency demonstrated a significant relative increase in CBF.
- At frequencies of 1 Hz, 2 Hz, and 3 Hz, the relative increase rates of CBF were 16.68%, 18.95%, and 21.21%, respectively.
- These findings indicate a dose-dependent relationship between EECP frequency and CBF augmentation.
Conclusions:
- Increasing EECP frequency is an effective strategy for enhancing cerebral blood flow perfusion.
- Numerical analysis validates that higher EECP frequencies improve cerebral perfusion, offering a potential advancement in managing cerebrovascular diseases.
- This study supports the optimization of EECP frequency as a therapeutic parameter for improving brain perfusion.
Abstract:
Based on the changes in phase characteristics of blood flow and pressure, enhanced external counterpulsation (EECP) reduces cardiac load and improves cerebral perfusion in patients with cerebrovascular diseases. However, increased cerebral blood flow (CBF) is associated with the rise in blood pressure and its complications. Increased EECP frequency is a valuable solution when combined with the electrical equivalent impedance characteristics of the lumped parameter model (LPM) of the human blood circulation system. Herein, to investigate the effect of different EECP frequencies on CBF perfusion, an LPM was established with cardiopulmonary circulation and eight systemic blood flow units with cerebral autoregulation module of ischemic stroke patients. Then, using differential equations, we analyzed those parameters through hemodynamic simulations in four EECP modes. With related influencing parameters remaining constant, we adjusted the pressure frequency of EECP and found that when compared to the traditional sequential EECP mode, the relative increase rate of CBF was 16.68%, 18.95%, and 21.21% from 1 to 3 Hz, respectively. This study validates the effect of improving blood prefusion with increasing EECP frequency through numerical analysis.
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