[en] Ultrasonography of the left and right femoral artery and vein was performed in 5 conscious horses. Velocity waveforms, recorded using low pulse repetition frequency, were used to calculate time-averaged mean velocity (TAV), velocity of component a (TaVa), velocity of component b (TaVb) and volumetric flow. Waveform analysis included calculation of early diastolic deceleration slope (EDDS) and pulsatility index (PI) and subjective description of the waveform. Measurements were recorded at monthly intervals for 6 months. The repeated measurements were used to determine the within-horse variation. Horses were then anaesthetised with halothane and the same measurements recorded 60 min after induction. Differences between measurements recorded in conscious and anaesthetised horses were determined. Within-horse variability for diameters of femoral arteries and veins was small (CV<10%). Within variability for all other measurements was marked (CV>11%), with within-horse variability being the largest for femoral venous flow (CV>35%). Source of variability was measurement error and biological variation. Despite variability in conscious horses it was possible to detect changes in blood flow during anaesthesia. In the femoral arteries, volumetric flow was lower and EDDS and PI was higher in anaesthetised horses. In the femoral veins, volumetric flow was also lower in anaesthetised horses. Therefore Doppler ultrasound appears to be a useful technique for studying blood flow in conscious and anaesthetised horses
Disciplines :
Veterinary medicine & animal health Anatomy (cytology, histology, embryology...) & physiology
Author, co-author :
Raisis, Anthea L; The Centre for Equine Studies, The Animal Health Trust, PO Box 5, Newmarket, Suffolk CB8 8JH, UK
Young, L. E.; The Centre for Equine Studies, The Animal Health Trust, PO Box 5, Newmarket, Suffolk CB8 8JH, UK
Meire, H. B.; Department of Radiology, Kings College Hospital, Denmark Hill, London SE5 9RS, UK
Taylor, Polly M; Department of Clinical Veterinary Medicine, University of Cambridge, Madingly Road, Cambridge CB3 0ES, UK
Walsh, K.; The Centre for Equine Studies, The Animal Health Trust, PO Box 5, Newmarket, Suffolk CB8 8JH, UK
Lekeux, Pierre ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie - Doyen de la Faculté de Médecine vétérinaire
Language :
English
Title :
Variability of Doppler ultrasound measurements of hindlimb blood flow in conscious horses
Publication date :
2000
Journal title :
Equine Veterinary Journal
ISSN :
0425-1644
eISSN :
2042-3306
Publisher :
Equine Veterinary Journal Ltd, Newmarket Suffolk, United Kingdom
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