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Detection and quantification of venous air embolism by wavelet analysis of Doppler heart sound

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6 Author(s)
Chan, F.H.Y. ; Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong ; Chan, B.C.B. ; Lam, F.K. ; Poon, P.W.F.
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The wavelet analysis of the Doppler heart sound detected under controlled venous air embolism at sub-clinically and clinically significant volumes was studied in anaesthetized dogs. Signal processing with wavelet enhances the Dower of embolic signal and facilitates the simple detection and extraction of embolic heart beats by thresholding. The cumulative power of the extracted embolic heart beats is found to be linearly related to the volume of embolic air on the log-log scale, suggesting that it is feasible to estimate clinically significant volume of embolic air in human subjects by linearly extrapolating from sub-clinical embolic volumes

Published in:

Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE  (Volume:3 )

Date of Conference:

31 Oct-3 Nov 1996