Histologic characterization of canine dilated cardiomyopathy

Area of Science:

• Veterinary Cardiology
• Canine Pathology

Background:

• Dilated cardiomyopathy (DCM) is a prevalent heart disease in dogs, marked by chamber dilation and impaired heart function.
• Clinical diagnosis relies on echocardiography and Doppler exams, excluding other cardiac conditions.
• Echocardiographic criteria for DCM are not entirely specific, often necessitating histologic confirmation.

Purpose of the Study:

• To differentiate the distinct histologic forms of canine dilated cardiomyopathy.
• To investigate the potential for early detection of DCM through histologic changes.

Main Methods:

• Review of histologic findings in clinically diagnosed canine DCM cases.
• Classification of DCM into distinct histologic subtypes based on observed changes.

Main Results:

• Two primary histologic forms of DCM were identified: "fatty infiltration-degenerative" (common in Boxers, Doberman Pinschers) and "attenuated wavy fiber" (seen in various large breeds).
• Histologic changes of the "attenuated wavy fiber" type can manifest before clinical or echocardiographic evidence of DCM.

Conclusions:

• Histologic examination reveals at least two distinct forms of canine DCM.
• The "attenuated wavy fiber" form offers potential for earlier DCM diagnosis in dogs, preceding clinical manifestation.