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   Norgate DJ. Emergency intraoperative transcutaneous pacing in a dog undergoing a high-pressure balloon inflation to relieve severe subaortic stenosis. Vet Rec Case Reports 2018;6:e000451 [Web Reference]
Belanger JM. Correlation of neuter status and expression of heritable disorders. Canine Genet Epidemiol 2017;4:6 [Web Reference]
Shen L. Aortoseptal angle and pressure gradient reduction following balloon valvuloplasty in dogs with severe subaortic stenosis. J Vet Cardiol 2017;19:144 [Web Reference]
Caivano D. Murmur intensity in adult dogs with pulmonic and subaortic stenosis reflects disease severity. J Small Anim Pract 2017;Oct [Web Reference]
Pinkos A. High-pressure balloon dilation in a dog with supravalvular aortic stenosis. J Vet Cardiol 2017;19:88 [Web Reference]
Côté E. Management of incidentally detected heart murmurs in dogs and cats. J Vet Cardiol 2015;17:245 [Web Reference]
Schrope DP. Prevalence of congenital heart disease in 76,301 mixed-breed dogs and 57,025 mixed-breed cats. J Vet Cardiol 2015;17:192 [Web Reference]
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