Wave intensity wall analysis: a novel noninvasive method to measure wave intensity

Area of Science:

• Cardiovascular Physiology
• Biomedical Engineering
• Medical Imaging

Background:

• Wave intensity analysis provides insights into heart-vascular system interactions.
• Traditional wave intensity analysis is invasive; noninvasive methods are sought.
• Speckle-tracking echocardiography measures arterial wall motion and deformation.

Purpose of the Study:

• To evaluate speckle-tracking derived arterial wall deformation as input for wave intensity calculations.
• To introduce and validate the novel Wave Intensity Wall Analysis (WIWA) algorithm.
• To compare WIWA with a validated invasive wave intensity system.

Main Methods:

• Utilized speckle-tracking echocardiography to measure longitudinal and radial arterial wall strain rates.
• Approximated flow changes (dU/dt) with longitudinal strain rate and pressure changes (dP/dt) with radial strain rate.
• Validated the WIWA algorithm against a standard wave intensity system in healthy individuals and coronary artery disease patients.

Main Results:

• Demonstrated good visual agreement between the WIWA system and the validated system.
• Found significant correlations in wave intensity peak intervals (W1-W2) for the total group (r=0.595) and diseased subgroup (r=0.797).
• Indicated that arterial wall mechanical properties measured by speckle tracking can serve as input for wave intensity calculations.

Conclusions:

• The WIWA concept, using speckle-tracking derived arterial wall deformation, is a viable noninvasive approach for wave intensity analysis.
• This novel method shows potential advantages over traditional techniques but requires further refinement and larger studies.
• The findings suggest a promising new avenue for assessing cardiovascular mechanics noninvasively.