Replication of the Frank-Starling response in a mock circulation loop

Area of Science:

• Cardiovascular physiology
• Biomedical engineering
• Medical device testing

Background:

• Mock circulation loops (MCLs) are essential for pre-clinical cardiovascular device evaluation.
• Current MCLs lack human autoregulatory responses, limiting their predictive accuracy.
• Accurate simulation of cardiac function is crucial for reliable device testing.

Purpose of the Study:

• To develop and implement a functional left and right ventricular Frank-Starling response within an MCL.
• To enhance MCLs with human-like autoregulation for more realistic cardiovascular simulations.
• To validate the simulated Frank-Starling response against established human physiological data.

Main Methods:

• A proportional controller regulated pneumatic ventricular driving pressure based on end-diastolic volume.
• Ventricular pressure-volume loops were generated under various physiological conditions.
• Simulated cardiac contractility was assessed by analyzing end-systolic pressure-volume relationships.

Main Results:

• A non-linear Frank-Starling response was successfully implemented in the MCL.
• The simulated response demonstrated accurate alterations in ventricular contractility with changing preload.
• Generated data showed strong agreement with previously reported human physiological data.

Conclusions:

• The enhanced MCL accurately simulates the Frank-Starling mechanism, a key aspect of human cardiac function.
• This improved test rig offers a more physiologically relevant platform for cardiovascular device refinement.
• The study successfully reduced the reliance on in-vivo trials by providing a validated simulation.