Aortic dissection in four cats: clinicopathological correlations

Area of Science:

• Veterinary Cardiology
• Cardiovascular Pathology

Background:

• Aortic dissection (AD) involves bleeding within the aortic wall, creating a false lumen.
• AD in cats is often linked to systemic hypertension, but presentation varies.

Observation:

• This case series details four cats with ascending aorta AD and aortic insufficiency.
• Clinical signs ranged from acute cardiac tamponade to chronic presentations.
• One cat exhibited Marfan-like connective tissue abnormalities, and two had concurrent hypertrophic cardiomyopathy.

Findings:

• Histopathology confirmed AD features in two cats.
• Hypertrophic cardiomyopathy, a novel finding in feline AD, may trigger dissection via shear stress.
• Normal blood pressure at presentation contrasted with typical human hypotension in ascending aorta AD.

Implications:

• Transthoracic echocardiography is a valuable, non-invasive diagnostic tool for feline ascending aorta AD.
• Understanding feline AD pathophysiology may inform future treatment strategies.
• The association with hypertrophic cardiomyopathy warrants further investigation in feline cardiovascular disease.