• 1
    Kriz NG, Hodgson DR, Rose RJ. Prevalence and clinical importance of heart murmurs in racehorses. J Am Vet Med Assoc 2000;216:14411445.
  • 2
    Young LE, Wood JLN. The effects of age and training on murmurs of atrioventricular valvular regurgitation in young Thoroughbreds. Equine Vet J 2000;32:195199.
  • 3
    Patteson MW, Cripps PJ. A survey of cardiac auscultatory findings in horses. Equine Vet J 1993;25:409415.
  • 4
    Young LE, Rogers K, Wood JL. Left ventricular size and systolic function in Thoroughbred racehorses and their relationships to race performance. J Appl Physiol 2005;99:12781285.
  • 5
    Levine SA, Harvey WP. Clinical Examination of the Heart. Philadelphia, PA: WB Saunders; 1950:2430.
  • 6
    Blissitt KJ, Bonagura JD. Colour flow Doppler echocardiography in horses with cardiac murmurs. Equine Vet J 1995;Suppl 19:8285.
  • 7
    Smetzer DL, Bishop S, Smith CR. Diastolic murmur of aortic insufficiency. Am Heart J 1966;72:489487.
  • 8
    Lightfoot GJ, Rogers K, Newton R, Young LE. An echocardiographic and auscultation study of right heart responses to race training in young National Hunt Thoroughbreds. Equine Vet J 2006;Suppl 36:153158.
  • 9
    Helwegan MGHJ, Young LE, Rogers K, Wood JLN. Measurements of right ventricular size and their relationships to the severity of tricuspid valve regurgitation in National Hunt Thoroughbreds. Equine Vet J 2006;Suppl 36:171177.
  • 10
    Michelsen S, Hurlen M, Otterstad JE. Prevalence of tricuspid and pulmonary regurgitation diagnosed by Doppler in apparently healthy women. Possible influence on their physical performance? Eur Heart J 1988;9:6167.
  • 11
    Douglas PS, Berman GO, O'Toole ML, et al. Prevalence of multivalvular regurgitation in athletes. Am J Cardiol 1989;64:209212.
  • 12
    Macchi C, Catini C, Catini CR, et al. A comparison between the heart of young athletes and of young healthy sedentary subjects: A morphometric and morpho-functional study by echo-color-Doppler method. Ital J Anat Embryol 2001;106:221231.
  • 13
    Pollak SJ, McMillan SA, Knopff WD, et al. Cardiac evaluation of women distance runners by echocardiographic color-Doppler flow mapping. J Am Coll Cardiol 1988;11:8993.
  • 14
    Akasaka T, Yoshikawa J, Yoshida K, et al. Age-related valvular regurgitation: A study by pulsed Doppler echocardiography. Circulation 1987;76:262265.
  • 15
    Macchi C, Lova RM, Giannelli F, et al. Physical activity, heart and ageing: A morpho-functional study by echo-color-Doppler in sedentary and nonsedentary healthy subjects. Ital J Anat Embryol 2003;108:129136.
  • 16
    Buhl R, Ersboll AK, Eriksen L, Koch J. Use of color Doppler echocardiography to assess the development of valvular regurgitation in Standardbred trotters. J Am Vet Med Assoc 2005;227:16301635.
  • 17
    Douglas PS, O'Toole M. Aging and physical activity determine cardiac structure and function in the older athlete. J Appl Physiol 1992;72:19691973.
  • 18
    Nakayama T, Wakao Y, Takiguchi S, et al. Prevalence of valvular regurgitation in normal Beagle dogs detected by color Doppler echocardiography. J Vet Med Sci 1994;56:973975.
  • 19
    Vasconcelos DF, Junqueira Jr LF, Sanchez Osella OF. Doppler echocardiographic comparison of valvular dynamics in bicycling, running, and football athletes, and sedentary subjects. Arq Bras Cardiol 1993;61:161164.
  • 20
    Constable PD, Hinchcliff KW, Olson J, Hamlin RL. Athletic heart syndrome in dogs competing in a long-distance sled race. J Appl Physiol 1994;76:433438.
  • 21
    Macchi C, Orlandini SZ, Orlansini GE. An anatomical study of the healthy human heart by echocardiography with special reference to physiological valvular regurgitation. Anat Anz 1994;176:8186.
  • 22
    Armstrong WF. Echocardiography. In: Zipes DP, Libby P, Bonow RO, Braunwald E, eds. Braunwald's Heart Disease. Philadelphia, PA: Elselvier Saunders; 2005:187261.
  • 23
    Otto CM. Valvular regurgitation. In: Otto CM, ed. Textbook of Clinical Echocardiography. Philadelphia, PA: Elselvier Saunders; 2004:315355.
  • 24
    Tribouilloy CM, Enriquez-Sarano M, Bailey KR, et al. Quantification of tricuspid regurgitation by measuring the width of the vena contracta with Doppler color flow imaging: A clinical study. J Am Coll Cardiol 2000;36:472478.
  • 25
    Suzuki Y, Kambara H, Kadota K, et al. Detection and evaluation of tricuspid regurgitation using a real-time, two-dimensional, color-coded, Doppler flow imaging system: Comparison with contrast two-dimensional echocardiography and right ventriculography. Am J Cardiol 1986;57:811815.
  • 26
    Mugge A, Daniel WG, Herrmann G, et al. Quantification of tricuspid regurgitation by Doppler color flow mapping after cardiac transplantation. Am J Cardiol 1990;66:884887.
  • 27
    Braunwald E, Perloff JK. Physical examination of the heart and circulation. In: Zipes DP, Libby P, Bonow RO, Braunwald E, eds. Braunwald's Heart Disease. Philadelphia, PA: Elselvier Saunders; 2005:77106.
  • 28
    Reef VB. Heart murmurs in horses: Determining their significance with echocardiography. Equine Vet J Suppl 1995;19:7180.
  • 29
    Blissitt KJ, Patteson M. Cardiac murmurs in horses—clinical evaluation. In Prac 1996;18:367373.