LEFT VENTRICULAR OUTFLOW TRACT OBSTRUCTION, AORTIC, SUBAORTIC, SUBVALVULAR STENOSIS
 
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   Eason BD et al. Influence of Beta Blockers on Survival in Dogs with Severe Subaortic Stenosis. Journal of Veterinary Internal Medicine 2014;28:857862 [Web Reference]
Ohad DG et al. The occurrence and suspected mode of inheritance of congenital subaortic stenosis and tricuspid valve dysplasia in Dogue de Bordeaux dogs. The Veterinary Journal 2013;197:351357 [Web Reference]
Visser LC, Scansen BA. Congenital bicuspid aortic valve in an English bulldog. Journal of Veterinary Cardiology 2013;15:87-92 [Web Reference]
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