Canine mitral valve size as measured by computed tomography

Area of Science:

• Veterinary Cardiology
• Medical Imaging
• Canine Anatomy

Background:

• Mitral valve dysfunction is a common cardiac condition in dogs.
• Accurate measurement of the mitral annulus is crucial for assessing disease severity and guiding treatment.
• Computed tomography (CT) offers high-resolution imaging for cardiovascular assessment.

Purpose of the Study:

• To establish reliable methods for measuring the canine mitral annulus using CT.
• To assess the interobserver reliability of these measurements.
• To provide reference values for normal canine mitral annulus dimensions.

Main Methods:

• Thoracic CT scans from 233 dogs without heart disease were analyzed.
• Five investigators used multiplanar reformatting to measure mitral valve dimensions and T4 length.
• Interobserver reliability was assessed by having all investigators measure 10 randomly selected animals.

Main Results:

• Excellent interobserver agreement (intraclass correlations > 0.9) was achieved for all measurements.
• Reference ranges for trigone-to-trigone distance (17.2 ± 4.7 mm) and circumference (79.0 ± 17.5 mm) were established.
• Normalized circumference by T4 length was 5.7 ± 0.7 mm, providing a standardized metric.

Conclusions:

• CT-based measurements of the canine mitral annulus are reproducible and consistent.
• This study provides essential anatomical data for diagnosing and managing canine mitral valve disease.
• Findings can aid in developing targeted therapies for mitral valve dysfunction and annular enlargement.