Acoustic Analyses of the Digital Doppler Allen Test

Area of Science:

• Vascular Ultrasound
• Acoustic Analysis
• Biomedical Engineering

Background:

• Assessing digital arterial circulation noninvasively is crucial for vascular health.
• Traditional methods may be invasive or limited in scope.
• Acoustic quantification of Doppler sounds offers a novel approach.

Purpose of the Study:

• To perform noninvasive acoustic quantification of digital arterial Doppler sounds.
• To evaluate the potential of acoustic assessment for determining digital arterial circulation.

Main Methods:

• Prospective study of 25 volunteers recording radial and ulnar digital artery Doppler sounds.
• Analysis using fast Fourier transform, measuring equivalent sound level (Leq), sound pressure difference (delta sound pressure), and frequency.
• Doppler sounds recorded under contralateral compression, ipsilateral compression, and no compression (control).

Main Results:

• Contralateral compression led to lower Leq and higher delta sound pressure, with high sensitivity and specificity.
• Ipsilateral compression resulted in significantly lower Leq and frequency.
• Doppler sounds in the contralateral compression group exhibited a staccato rhythm, with high inter-examiner agreement.

Conclusions:

• A staccato rhythm in digital artery Doppler sounds during contralateral compression suggests high digital artery patency.
• Acoustic assessment of Doppler sounds provides a promising noninvasive method for evaluating digital arterial circulation.