Congenital Heart Disease in Cats- Aortic Stenosis

Aortic stenosis (SAS – standing for Sub-Aortic Stenosis) is a birth defect of the aortic valve.  Fixed SAS, which is most commonly seen in the dog, is extremely rare in cats with only sporadic cases noted over the past 40 years.  This birth defect causes narrowing of the aortic valve, or the tissue just below or above the valve.  This narrower “tube” is more difficult to move blood through, thereby making the left ventricle thickened (concentric hypertrophy).  Click here to learn more about the normal functioning of a cat heart.

Congenital Heart Disease in Cats- Aortic Stenosis
Cats most commonly experience dynamic SAS, which is caused by abnormal movement of the mitral valve.  This is most commonly in conjunction with hypertrophic cardiomyopathy (HCM).  This is not a birth defect.

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Dr Roger Johnson and Dr Kyle Marano

Roger K. Johnson, DVM, Diplomate ACVIM (internal medicine) is a board-certified veterinary internal medicine specialist. His professional interests include cardiology as well as using advanced diagnostics to help his patients. His particular favorites include echocardiography, abdominal ultrasonography, and endoscopy. Kyle Marano, DVM is a small animal veterinarian practicing out of Northern Colorado. He has written pieces ranging from sports commentary and analysis to quips on the every day life of veterinary medicine. His furry family includes a chocolate lab mix and an overly nosy cat.

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