Description    Aortic Stenosis can be supravalvular, valvular, or subvalvular; subvalvular stenosis is a common congenital heart defect in dogs. Narrowing of the ventricular outflow tract results in ventricular hypertrophy with severity related to the degree of stenosis. Many canine breeds have been affected; a genetic mode of inheritance is documented or suspected in several. There is typically a crescendo-decrescendo murmur loudest at the left-side heart base. A sudden death syndrome in young dogs might be due to inadequate perfusion of ventricular myocardium.
Species   Canine, Feline
Signs   Absent p waves, Ascites, Atrial enlargement, Atrial fibrillation, Coughing, Dyspnea, Exercise intolerance, Generalized weakness, Heart murmur, Hindfoot swelling, Hindlimb swelling, Increased respiratory rate, Lack of growth or weight gain, Palpable precordial thrill, Seizures or syncope, Sudden death, Tachycardia, Ventricular enlargement, Ventricular premature beat, Ventricular tachycardia, Weak pulse
References   Côté E. Management of incidentally detected heart murmurs in dogs and cats. Journal of Veterinary Cardiology 2015;17:245–261 [Web Reference]
Schrope DP. Prevalence of congenital heart disease in 76,301 mixed-breed dogs and 57,025 mixed-breed cats. Journal of Veterinary Cardiology 2015;17:192–202 [Web Reference]
Eason BD et al. Influence of Beta Blockers on Survival in Dogs with Severe Subaortic Stenosis. Journal of Veterinary Internal Medicine 2014;28:857–862 [Web Reference]
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