Pulsed wave Doppler echocardiography in normal horses

Reference values were established for selected Doppler derived variables from a group of 40 normal Thoroughbred and Thoroughbred cross horses. Standard two-dimensional (2-D) images used for guiding the Doppler sampling site allowed accurate alignment with flow. Tricuspid inflow velocities during rap...

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Bibliographic Details
Published inEquine veterinary journal. Supplement no. 19; p. 38
Main Authors Blissitt, K J, Bonagura, J D
Format Journal Article
LanguageEnglish
Published United States 01.09.1995
Subjects
Aging - pathology
Aging - physiology
Animals
Aorta - diagnostic imaging
Aorta - physiology
Body Weight - physiology
Echocardiography, Doppler, Pulsed - methods
Echocardiography, Doppler, Pulsed - veterinary
Female
Heart - anatomy & histology
Heart - physiology
Heart Murmurs - diagnostic imaging
Heart Murmurs - physiopathology
Heart Murmurs - veterinary
Heart Ventricles - anatomy & histology
Heart Ventricles - diagnostic imaging
Horse Diseases - diagnosis
Horse Diseases - diagnostic imaging
Horse Diseases - physiopathology
Horses - anatomy & histology
Horses - physiology
Male
Pulmonary Artery - diagnostic imaging
Pulmonary Artery - physiology
Regional Blood Flow
Ventricular Function
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Summary:Reference values were established for selected Doppler derived variables from a group of 40 normal Thoroughbred and Thoroughbred cross horses. Standard two-dimensional (2-D) images used for guiding the Doppler sampling site allowed accurate alignment with flow. Tricuspid inflow velocities during rapid filling (E) and atrial contraction (A) were significantly higher when recorded from a right parasternal angled view than from a right parasternal long-axis view. In 8 horses the tricuspid inflow peak A velocity was higher than the peak E velocity. The peak acceleration of blood flow was higher (P = 0.000) in the aorta (mean 8.01 m/s/s) than in the pulmonary artery (4.45 m/s/s). Significant differences were also noted in the pre-ejection period, ejection time and acceleration time between the 2 vessels. Horses with functional ejection murmurs had lower peak aortic acceleration and a longer acceleration time than horses without flow murmurs. Horses with filling murmurs over the left hemithorax had a significantly higher peak mitral E velocity than horses without such murmurs. Measurements from Doppler waveforms were repeatable and may prove useful in assessing ventricular function in this species.