Fast detection of venous air embolism in Doppler heart sound using the wavelet transform

The introduction of air bubbles into the systemic circulation can result in significant morbidity. Real-time monitoring of continuous heart sound in patients detected by precordial Doppler ultrasound is, thus, vital for early detection of venous air embolism (VAE) during surgery. In this study, the...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 1997-04, Vol.44 (4), p.237-246
Main Authors: Chan, B.C.B., Chan, F.H.Y., Lam, F.K., Ping-Wing Lui, Poon, P.W.F.
Format: Article
Language:English
Subjects:
Algorithms
Animals
Biological and medical sciences
Biomedical monitoring
Blood and lymphatic vessels
Cardiology. Vascular system
Continuous wavelet transforms
Detection algorithms
Diseases of the peripheral vessels. Diseases of the vena cava. Miscellaneous
Dogs
Embolism, Air - diagnostic imaging
Fourier Analysis
Heart
Heart Sounds
Humans
Injections, Intravenous
Medical sciences
Monitoring, Physiologic
Patient monitoring
Signal Processing, Computer-Assisted
Surgery
Ultrasonic imaging
Ultrasonography, Doppler
Wavelet transforms
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Summary:The introduction of air bubbles into the systemic circulation can result in significant morbidity. Real-time monitoring of continuous heart sound in patients detected by precordial Doppler ultrasound is, thus, vital for early detection of venous air embolism (VAE) during surgery. In this study, the multiscale feature of wavelet transforms (WT's) is exploited to examine the embolic Doppler heart sound (DHS) during intravenous air injections in dogs. As both humans and dogs share similar physiological conditions, the authors' methods and results for dogs are expected to be applicable to humans. The WT of DHS at scale 2/sup j/(j=1,2) selectively magnified the power of embolic, but not the normal, heart sound. Statistically, the enhanced embolic power was found to be sensitive (P
ISSN:0018-9294
1558-2531
DOI:10.1109/10.563293