SPECTRAL CHARACTERISTICS OF EMBOLIC HEART SOUNDS DETECTED BY PRECORDIAL DOPPLER ULTRASOUND DURING VENOUS AIR EMBOLISM IN DOGS

We have studied the frequency spectrum of embolic heart sounds as detected by precordial Doppler ultrasound after injecting air 0.01–0.1 ml into the external jugular vein of anaesthetized dogs (n = 7). At volumes of 0.05 ml and greater, there was a significant increase in both the maximum frequency...

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Veröffentlicht in:	British Journal of Anaesthesia 1993-11, Vol.71 (5), p.689-695
Hauptverfasser:	LUI, P.-W., LIN, Y.-M., CHAN, F.H.Y., TSOU, M.-Y., WANG, S., LAM, F.K., POON, P.W.F.
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals Biological and medical sciences Blood and lymphatic vessels Cardiology. Vascular system Diseases of the peripheral vessels. Diseases of the vena cava. Miscellaneous Dogs Embolism venous air Embolism, Air - diagnostic imaging Heart Sounds - physiology Jugular Veins Medical sciences Monitoring, Physiologic Monitoring: precordial Doppler ultrasound Spectrum Analysis Time Factors Ultrasonography
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Zusammenfassung:	We have studied the frequency spectrum of embolic heart sounds as detected by precordial Doppler ultrasound after injecting air 0.01–0.1 ml into the external jugular vein of anaesthetized dogs (n = 7). At volumes of 0.05 ml and greater, there was a significant increase in both the maximum frequency of the spectrum and the power of those high frequency components to greater than control values. Both changes correlated significantly with the volume of air injected (P < 0.05). Withrepeated injections of air at 5-min intervals, there was a small increase in the high frequency components in the control signal between injections (P
ISSN:	0007-0912 1471-6771
DOI:	10.1093/bja/71.5.689