Prosthetic heart valves: waveform comparisons and average value disposition for pulsatile flow in vitro

Area of Science:

• Biomedical Engineering
• Cardiovascular Devices
• Medical Device Testing

Background:

• Standardization and continuous improvement of in vitro heart valve testing methods are increasingly important.
• Current methods face challenges in waveform comparison and average value analysis.
• Accurate assessment of heart valve performance under pulsatile flow is critical for clinical application.

Purpose of the Study:

• To address problems in waveform comparison and average value analysis for in vitro heart valve testing.
• To propose a synthetic approach considering both mean values and waveforms for complete pulsatile characteristic reflection.
• To evaluate the feasibility of classifying and judging heart valve quality using advanced data analysis methods.

Main Methods:

• Utilized a pneumatic pulsatile model to measure pressures (pre- and post-valve) and flow rate as three one-dimensional variates.
• Calculated mean values according to Food and Drug Administration (FDA) and International Organization for Standardization (ISO) guidelines.
• Employed numerical filtering for waveform treatment and the constellation graphical method for multivariate analysis of mean values.

Main Results:

• Experimental waveform analysis revealed distinct flow curves for different valve types, even with similar pressure and flow rate ranges.
• A synthetic consideration of mean values and time-domain waveforms provided a more complete reflection of pulsatile valve characteristics.
• Numerical filtering enhanced the comparability of measured results from different devices.

Conclusions:

• Integrating mean values and waveform analysis is essential for a comprehensive evaluation of heart valve pulsatile performance.
• The constellation graphical method offers a feasible approach for classifying valves and assessing their quality under pulsatile flow conditions.
• Improved standardization and analytical methods are key to advancing in vitro heart valve testing.