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Radiographic evaluation of caudal vena cava size in dogs
L B Lehmkuhl1, J D Bonagura, D S Biller
1Department of Veterinary Clinical Sciences, Ohio State University, College of Veterinary Medicine, Columbus 43210-1089, USA.
Insights
Radiographic evaluation of the caudal vena cava (CVC) size can indicate right-sided heart disease in dogs. Specific CVC ratios compared to the aorta, vertebra, and rib can help identify these conditions.
Area of Science:
- Veterinary Radiology
- Cardiology
- Diagnostic Imaging
Background:
- Dilation of the caudal vena cava (CVC) on lateral thoracic radiographs is commonly associated with right-sided congestive heart failure.
- Accurate interpretation of CVC size is crucial for diagnosing cardiac abnormalities in canine patients.
Purpose of the Study:
- To quantitatively assess the diagnostic value of CVC diameter measurements on thoracic radiographs.
- To establish reliable radiographic ratios for identifying right-sided heart disease in dogs.
Main Methods:
- Compared CVC diameter to descending aorta (Ao), thoracic vertebral length (VL), and right fourth rib width (R4) in dogs with and without right heart disease.
- Utilized receiver operating characteristic curves and likelihood ratios to define diagnostic thresholds.
- Analyzed data from 35 dogs with right heart disease and 35 control dogs.
Main Results:
- All CVC ratios (CVC/Ao, CVC/VL, CVC/R4) were significantly larger in dogs with right heart disease.
- Established specific ratio cutoffs: CVC/Ao > 1.50, CVC/VL > 1.30, and CVC/R4 > 3.50.
Conclusions:
- These defined radiographic ratios are strongly suggestive of right-sided heart abnormalities in dogs.
- This quantitative approach enhances the clinical utility of thoracic radiographs for diagnosing right heart disease.
Abstract:
Dilation of the caudal vena cava (CVC) on lateral thoracic radiographs is often interpreted as suggestive of right-sided congestive heart failure. To quantitate the clinical utility of evaluating CVC size as an indicator of right-sided heart disease, we compared the ratio of the diameter of the CVC as measured on a left lateral thoracic radiograph to the descending aorta (Ao), length of the thoracic vertebra above the tracheal bifurcation (VL), and width of the right fourth rib (R4) in 35 dogs with right heart disease and 35 control dogs. Each CVC ratio (CVC/Ao, CVC/VL, CVC/R4) was statistically larger in dogs with right heart disease. Response operating characteristic curves and likelihood ratios were used to determine ratios helpful in identifying dogs with right heart disease. A CVC/Ao > 1.50, CVC/VL > 1.30, or CVC/R4 > 3.50 are strongly suggestive of a right-sided heart abnormality in a patient.