1. Marriott HJL. Systolic murmurs. In: Bedside cardiac diagnosis. Philadelphia: JB Lippincott Co, 1992; 83–87.
2. Bronzetti G, Corzani A. The seven “S” murmurs: an alliteration about innocent murmurs in cardiac auscultation. Clin Pediatr (Phila) 2010; 49: 713.
3. Ettinger SJ, Suter PF. Heart sounds and phonocardiography. In: Canine cardiology. St Louis: Saunders-Elsevier, 1970; 12–39.
4. Pedersen HD, Häggström J & Falk T, et al. Auscultation in mild mitral regurgitation in dogs: observer variation, effects of physical maneuvers, and agreement with color Doppler echocardiography and phonocardiography. J Vet Intern Med 1999; 13: 56–64.
5. Root Kustritz M. History and physical examination of the weanling and adolescent. In: Peterson ME, Kutzler MA, eds. Small animal pediatrics. St Louis: Elsevier, 2011; 28–34.
6. Bélanger MC, Côté E. Innocent heart murmurs. In: Ettinger SJ, Feldman EC, eds. Textbook of veterinary internal medicine. 7th ed. St Louis: Elsevier, 2010; 255–258.
7. Buchanan JW. Prevalence of cardiovascular disorders. In: Fox PR, Sisson DD, Moïse NS, eds. Textbook of canine and feline cardiology. 2nd ed. Philadelphia: WB Saunders Co, 1998; 457–470.
8. Koplitz SL, Meurs KM, Bonagura JD. Echocardiographic assessment of the left ventricular outflow tract in the Boxer. J Vet Intern Med 2006; 20: 904–911.
9. Bavegems VC, Duchateau L & Polis IE, et al. Detection of innocent systolic murmurs by auscultation and their relation to hematologic and echocardiographic findings in clinically normal Whippets. J Am Vet Med Assoc 2011; 238: 468–471.
10. Lamb CR, Boswood A & Volkman A, et al. Assessment of survey radiography as a method for diagnosis of congenital cardiac disease in dogs. J Small Anim Pract 2001; 42: 541–545.
11. Tse YC, Rush JE & Cunningham SM, et al. Evaluation of a training course in focused echocardiography for noncardiology house officers. J Vet Emerg Crit Care (San Antonio) 2013; 23: 268–273.
12. Oyama MA, Sisson DD & Thomas WP, et al. Congenital heart disease. In: Ettinger SJ, Feldman EC, eds. Textbook of veterinary internal medicine. 7th ed. St Louis: Elsevier, 2010; 1250–1298.
13. Ljungvall I, Ahlstrom C & Höglund K, et al. Use of signal analysis of heart sounds and murmurs to assess severity of mitral valve regurgitation attributable to myxomatous mitral valve disease in dogs. Am J Vet Res 2009; 70: 604–613.
14. Höglund K, Häggström J & Bussadori C, et al. A prospective study of systolic ejection murmurs and left ventricular outflow tract in boxers. J Small Anim Pract 2011; 52: 11–17.
15. Chetboul V, Serres F & Tissier R, et al. Association of plasma N-terminal pro-B-type natriuretic peptide concentration with mitral regurgitation severity and outcome in dogs with asymptomatic degenerative mitral valve disease. J Vet Intern Med 2009; 23: 984–994.
16. Lord PF, Hansson K & Carnabuci C, et al. Radiographic heart size and its rate of increase as tests for onset of congestive heart failure in Cavalier King Charles Spaniels with mitral valve regurgitation. J Vet Intern Med 2011; 25: 1312–1319.
17. Wess G, Mäurer J & Simak J, et al. Use of Simpson's method of disc to detect early echocardiographic changes in Doberman Pinschers with dilated cardiomyopathy. J Vet Intern Med 2010; 24: 1069–1076.
18. Borgarelli M, Zini E & D'Agnolo G, et al. Comparison of primary mitral valve disease in German Shepherd Dogs and in small breeds. J Vet Cardiol 2004; 6: 27–34.
19. Epstein M, Kuehn NF & Landsberg G, et al. AAHA senior care guidelines for dogs and cats. J Am Anim Hosp Assoc 2005; 41: 81–91.
20. Goodwin JK, Lombard CW. Patent ductus arteriosus in adult dogs: clinical features of 14 cases. J Am Anim Hosp Assoc 1992; 28: 349–354.
21. Detweiler DK, Patterson DF. The prevalence and types of cardiovascular diseases in dogs. Ann N Y Acad Sci 1965; 127: 481–516.
22. Serfass P, Chetboul V & Sampedrano CC, et al. Retrospective study of 942 small-sized dogs: prevalence of left apical systolic heart murmur and left-sided heart failure, critical effects of breed and sex. J Vet Cardiol 2006; 8: 11–18.
23. Kittleson MD. The approach to the patient with cardiac disease. In: Kittleson MD, Kienle RD. Small animal cardiovascular medicine. St Louis: Mosby, 1998; 195–217.
24. Côté E, Manning AM & Emerson D, et al. Assessment of the prevalence of heart murmurs in overtly healthy cats. J Am Vet Med Assoc 2004; 225: 384–388.
25. Paige CF, Abbott JA & Elvinger F, et al. Prevalence of cardiomyopathy in apparently healthy cats. J Am Vet Med Assoc 2009; 234: 1398–1403.
26. Wagner T, Fuentes VL & Payne JR, et al. Comparison of auscultatory and echocardiographic findings in healthy adult cats. J Vet Cardiol 2010; 12: 171–182.
27. Bonagura JD. Feline echocardiography. J Feline Med Surg 2000; 2: 147–151.
28. Dirven MJ, Cornelissen JM & Barendse MA, et al. Cause of heart murmurs in 57 apparently healthy cats. Tijdschr Diergeneeskd 2010; 135: 840–847.
29. Nakamura RK, Rishniw M & King MK, et al. Prevalence of echocardiographic evidence of cardiac disease in apparently healthy cats with murmurs. J Feline Med Surg 2011; 13: 266–271.
30. Rishniw M, Thomas WP. Dynamic right ventricular outflow obstruction: a new cause of systolic murmurs in cats. J Vet Intern Med 2002; 16: 547–552.
31. Payne JR, Borgeat K & Connolly DJ, et al. Prognostic indicators in cats with hypertrophic cardiomyopathy. J Vet Intern Med 2013; 27: 1427–1436.
32. Sleeper MM, Roland R, Drobatz KJ. Use of the vertebral heart scale for differentiation of cardiac and noncardiac causes of respiratory distress in cats: 67 cases (2002–2003). J Am Vet Med Assoc 2013; 242: 366–371.
33. Fox PR, Rush JE & Reynolds CA, et al. Multicenter evaluation of plasma N-terminal probrain natriuretic peptide (NT-pro BNP) as a biochemical screening test for asymptomatic (occult) cardiomyopathy in cats. J Vet Intern Med 2011; 25: 1010–1016.
34. Schober KE, Maerz I & Ludewig E, et al. Diagnostic accuracy of electrocardiography and thoracic radiography in the assessment of left atrial size in cats: comparison with transthoracic 2-dimensional echocardiography. J Vet Intern Med 2007; 21: 709–718.
35. Rush JE, Freeman LM & Fenollosa NK, et al. Population and survival characteristics of cats with hypertrophic cardiomyopathy: 260 cases (1990–1999). J Am Vet Med Assoc 2002; 220: 202–207.
36. Johnson MS, Martin M & Edwards D, et al. Pulmonic stenosis in dogs: balloon dilation improves clinical outcome. J Vet Intern Med 2004; 18: 656–662.
37. Eyster GE, Eyster JT & Cords GB, et al. Patent ductus arteriosus in the dog: characteristics of occurrence and results of surgery in one hundred consecutive cases. J Am Vet Med Assoc 1976; 168: 435–438.
38. Saunders AB, Gordon SG & Boggess MM, et al. Long-term outcome in dogs with patent ductus arteriosus: 520 cases (1994–2009). J Vet Intern Med 2014; 28: 401–410.
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Prepared by the Working Group of the American College of Veterinary Internal Medicine Specialty of Cardiology on Incidentally Detected Heart Murmurs.
1. Marriott HJL. Systolic murmurs. In: Bedside cardiac diagnosis. Philadelphia: JB Lippincott Co, 1992; 83–87.
2. Bronzetti G, Corzani A. The seven “S” murmurs: an alliteration about innocent murmurs in cardiac auscultation. Clin Pediatr (Phila) 2010; 49: 713.
3. Ettinger SJ, Suter PF. Heart sounds and phonocardiography. In: Canine cardiology. St Louis: Saunders-Elsevier, 1970; 12–39.
4. Pedersen HD, Häggström J & Falk T, et al. Auscultation in mild mitral regurgitation in dogs: observer variation, effects of physical maneuvers, and agreement with color Doppler echocardiography and phonocardiography. J Vet Intern Med 1999; 13: 56–64.
5. Root Kustritz M. History and physical examination of the weanling and adolescent. In: Peterson ME, Kutzler MA, eds. Small animal pediatrics. St Louis: Elsevier, 2011; 28–34.
6. Bélanger MC, Côté E. Innocent heart murmurs. In: Ettinger SJ, Feldman EC, eds. Textbook of veterinary internal medicine. 7th ed. St Louis: Elsevier, 2010; 255–258.
7. Buchanan JW. Prevalence of cardiovascular disorders. In: Fox PR, Sisson DD, Moïse NS, eds. Textbook of canine and feline cardiology. 2nd ed. Philadelphia: WB Saunders Co, 1998; 457–470.
8. Koplitz SL, Meurs KM, Bonagura JD. Echocardiographic assessment of the left ventricular outflow tract in the Boxer. J Vet Intern Med 2006; 20: 904–911.
9. Bavegems VC, Duchateau L & Polis IE, et al. Detection of innocent systolic murmurs by auscultation and their relation to hematologic and echocardiographic findings in clinically normal Whippets. J Am Vet Med Assoc 2011; 238: 468–471.
10. Lamb CR, Boswood A & Volkman A, et al. Assessment of survey radiography as a method for diagnosis of congenital cardiac disease in dogs. J Small Anim Pract 2001; 42: 541–545.
11. Tse YC, Rush JE & Cunningham SM, et al. Evaluation of a training course in focused echocardiography for noncardiology house officers. J Vet Emerg Crit Care (San Antonio) 2013; 23: 268–273.
12. Oyama MA, Sisson DD & Thomas WP, et al. Congenital heart disease. In: Ettinger SJ, Feldman EC, eds. Textbook of veterinary internal medicine. 7th ed. St Louis: Elsevier, 2010; 1250–1298.
13. Ljungvall I, Ahlstrom C & Höglund K, et al. Use of signal analysis of heart sounds and murmurs to assess severity of mitral valve regurgitation attributable to myxomatous mitral valve disease in dogs. Am J Vet Res 2009; 70: 604–613.
14. Höglund K, Häggström J & Bussadori C, et al. A prospective study of systolic ejection murmurs and left ventricular outflow tract in boxers. J Small Anim Pract 2011; 52: 11–17.
15. Chetboul V, Serres F & Tissier R, et al. Association of plasma N-terminal pro-B-type natriuretic peptide concentration with mitral regurgitation severity and outcome in dogs with asymptomatic degenerative mitral valve disease. J Vet Intern Med 2009; 23: 984–994.
16. Lord PF, Hansson K & Carnabuci C, et al. Radiographic heart size and its rate of increase as tests for onset of congestive heart failure in Cavalier King Charles Spaniels with mitral valve regurgitation. J Vet Intern Med 2011; 25: 1312–1319.
17. Wess G, Mäurer J & Simak J, et al. Use of Simpson's method of disc to detect early echocardiographic changes in Doberman Pinschers with dilated cardiomyopathy. J Vet Intern Med 2010; 24: 1069–1076.
18. Borgarelli M, Zini E & D'Agnolo G, et al. Comparison of primary mitral valve disease in German Shepherd Dogs and in small breeds. J Vet Cardiol 2004; 6: 27–34.
19. Epstein M, Kuehn NF & Landsberg G, et al. AAHA senior care guidelines for dogs and cats. J Am Anim Hosp Assoc 2005; 41: 81–91.
20. Goodwin JK, Lombard CW. Patent ductus arteriosus in adult dogs: clinical features of 14 cases. J Am Anim Hosp Assoc 1992; 28: 349–354.
21. Detweiler DK, Patterson DF. The prevalence and types of cardiovascular diseases in dogs. Ann N Y Acad Sci 1965; 127: 481–516.
22. Serfass P, Chetboul V & Sampedrano CC, et al. Retrospective study of 942 small-sized dogs: prevalence of left apical systolic heart murmur and left-sided heart failure, critical effects of breed and sex. J Vet Cardiol 2006; 8: 11–18.
23. Kittleson MD. The approach to the patient with cardiac disease. In: Kittleson MD, Kienle RD. Small animal cardiovascular medicine. St Louis: Mosby, 1998; 195–217.
24. Côté E, Manning AM & Emerson D, et al. Assessment of the prevalence of heart murmurs in overtly healthy cats. J Am Vet Med Assoc 2004; 225: 384–388.
25. Paige CF, Abbott JA & Elvinger F, et al. Prevalence of cardiomyopathy in apparently healthy cats. J Am Vet Med Assoc 2009; 234: 1398–1403.
26. Wagner T, Fuentes VL & Payne JR, et al. Comparison of auscultatory and echocardiographic findings in healthy adult cats. J Vet Cardiol 2010; 12: 171–182.
27. Bonagura JD. Feline echocardiography. J Feline Med Surg 2000; 2: 147–151.
28. Dirven MJ, Cornelissen JM & Barendse MA, et al. Cause of heart murmurs in 57 apparently healthy cats. Tijdschr Diergeneeskd 2010; 135: 840–847.
29. Nakamura RK, Rishniw M & King MK, et al. Prevalence of echocardiographic evidence of cardiac disease in apparently healthy cats with murmurs. J Feline Med Surg 2011; 13: 266–271.
30. Rishniw M, Thomas WP. Dynamic right ventricular outflow obstruction: a new cause of systolic murmurs in cats. J Vet Intern Med 2002; 16: 547–552.
31. Payne JR, Borgeat K & Connolly DJ, et al. Prognostic indicators in cats with hypertrophic cardiomyopathy. J Vet Intern Med 2013; 27: 1427–1436.
32. Sleeper MM, Roland R, Drobatz KJ. Use of the vertebral heart scale for differentiation of cardiac and noncardiac causes of respiratory distress in cats: 67 cases (2002–2003). J Am Vet Med Assoc 2013; 242: 366–371.
33. Fox PR, Rush JE & Reynolds CA, et al. Multicenter evaluation of plasma N-terminal probrain natriuretic peptide (NT-pro BNP) as a biochemical screening test for asymptomatic (occult) cardiomyopathy in cats. J Vet Intern Med 2011; 25: 1010–1016.
34. Schober KE, Maerz I & Ludewig E, et al. Diagnostic accuracy of electrocardiography and thoracic radiography in the assessment of left atrial size in cats: comparison with transthoracic 2-dimensional echocardiography. J Vet Intern Med 2007; 21: 709–718.
35. Rush JE, Freeman LM & Fenollosa NK, et al. Population and survival characteristics of cats with hypertrophic cardiomyopathy: 260 cases (1990–1999). J Am Vet Med Assoc 2002; 220: 202–207.
36. Johnson MS, Martin M & Edwards D, et al. Pulmonic stenosis in dogs: balloon dilation improves clinical outcome. J Vet Intern Med 2004; 18: 656–662.
37. Eyster GE, Eyster JT & Cords GB, et al. Patent ductus arteriosus in the dog: characteristics of occurrence and results of surgery in one hundred consecutive cases. J Am Vet Med Assoc 1976; 168: 435–438.
38. Saunders AB, Gordon SG & Boggess MM, et al. Long-term outcome in dogs with patent ductus arteriosus: 520 cases (1994–2009). J Vet Intern Med 2014; 28: 401–410.
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