Malformation of the canine mitral valve complex

Area of Science:

• Veterinary Cardiology
• Canine Pathology

Background:

• Mitral regurgitation (MR) is a significant cardiac condition in dogs.
• Understanding the specific pathological changes in young dogs with MR is essential for diagnosis and treatment.

Purpose of the Study:

• To describe the clinical and radiographic findings of mitral regurgitation in a cohort of young dogs.
• To detail the specific anatomical alterations of the mitral valve complex and associated cardiac anomalies.

Main Methods:

• Clinical and radiographic diagnosis of mitral regurgitation in 29 dogs.
• Detailed examination of the mitral valve complex, including anulus, leaflets, chordae tendineae, and papillary muscles.
• Identification of concurrent cardiac anomalies.

Main Results:

• Twenty-nine dogs (mean age 7.3 months) were diagnosed with MR, including Great Danes and German Shepherd Dogs.
• Observed mitral valve complex alterations: enlarged anulus, thickened leaflets, abnormal chordae tendineae, malpositioned papillary muscles, and endocardial fibrosis.
• Other cardiac anomalies found: tricuspid valve dysplasia, patent ductus arteriosus, aortic stenosis, and ventricular septal defect.

Conclusions:

• Young dogs diagnosed with mitral regurgitation exhibit a range of complex mitral valve and cardiac anomalies.
• These findings highlight the diverse pathological spectrum of MR in juvenile canine populations.
• Further research into the etiology and long-term implications of these anomalies is warranted.