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  • Author or Editor: James W. Buchanan x
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Abstract

Objective—To determine relative heart size in clinically normal puppies and assess whether relative heart size changes with growth.

Design—Prospective radiographic study.

Animals—11 puppies without evidence of disease.

Procedure—Standardized measurements of the long and short axes of the heart, midthoracic vertebrae, and other structures were made at 3, 6, 12, and 36 months of age. Measurements were recorded in millimeters and number of thoracic vertebral lengths spanned by each dimension, measured caudally from T4 on lateral radiographic views. The long and short axis measurements of the heart, expressed in vertebral lengths, were added to yield vertebral heart size.

Results—Mean ± SD vertebral heart sizes on lateral radiographic views at 3, 6, 12, and 36 months of age were 10.0 ± 0.5, 9.8 ± 0.4, 9.9 ± 0.6, and 10.3 ± 0.6 vertebrae, respectively. Significant differences were not detected.

Conclusions and Clinical Relevance—Vertebral heart size measurements in puppies are within the reference range for adult dogs (9.7 ± 0.5 vertebrae) and do not change significantly with growth to 3 years of age. Standards for determining cardiac enlargement are similar in puppies and adult dogs. (J Am Vet Med Assoc 2001;219:57–59)

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in Journal of the American Veterinary Medical Association

Abstract

Objective—To determine absolute and relative heart size in clinically normal cats by correlating heart size and selected skeletal structures.

Design— Prospective radiographic study.

Animals—100 cats that did not have thoracic radiographic abnormalities.

Procedure—Standardized measurements of the long and short axes of the heart, midthoracic vertebrae, and other structures were made. Measurements were recorded in millimeters and number of thoracic vertebral lengths spanned by each dimension, measured caudally from T4 in a lateral radiograph. The long- and short-axis measurements of the heart, expressed in vertebral lengths, were added to yield vertebral heart size.

Results—Mean ± SD vertebral heart size in lateral radiographs was 7.5 ± 0.3 vertebrae. The long-axis dimension correlated with the length of 3 sternebrae, measured from S2 to S4. The cardiac short-axis dimension correlated moderately with the length of 3.2 vertebrae, measured from T4 to T6. The cardiac short-axis dimension in ventrodorsal radiographs was 3.4 ± 0.25 vertebrae.

Conclusions and Clinical Relevance—The vertebral heart-size method is easy to use, allows objective assessment of heart size, and may be helpful in determining cardiomegaly and comparing heart size in sequential radiographs. ( J Am Vet Med Assoc 2000;216:210–214)

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in Journal of the American Veterinary Medical Association