The cardiac area open polygon (AREA-POL) values were: RL-AREA-POL: 6.78 ± 0.65 cm 2 LL-AREA-POL: 6.88 ± 0.68 cm 2 VD-AREA-POL: 7.20 ± 0.91 cm 2 and DV-AREA-POL: 7.57 ± 0.88 cm 2 for males and RL-AREA-POL: 4.28 ± 0.30 cm 2 LL-AREA-POL: 4.35 ± 0.35 cm 2 VD-AREA-POL: 4.72 ± 0.65 cm 2 and DV-AREA-POL: 4.79 ± 0.66 cm 2 for females, with similar differences noted from various radiographic projections. The new measurements based on determining the cardiac area were also marked by clear sexual dimorphism, as shown for the cardiac area-axis (AREA-AXIS): RL-AREA-AXIS: 3.82 ± 0.45 cm 2 LL-AREA-AXIS: 3.87 ± 0.41 cm 2 ventrodorsal (VD)-AREA-AXIS: 4.59 ± 0.64 cm 2 and DV-AREA-AXIS: 4.80 ± 0.50 cm 2 for males and RL-AREA-AXIS: 2.39 ± 0.23 cm 2 LL-AREA-AXIS: 2.41 ± 0.26 cm 2 VD-AREA-AXIS: 3.08 ± 0.45 cm 2 and DV-AREA-AXIS: 3.06 ± 0.47 cm 2 for females.

Regarding the sternebral heart scale (SHS), the values were: RL-SHS: 5.10 ± 0.20 s (sternebrae units) and LL-SHS: 5.11 ± 0.20 s for males and RL-SHS: 4.67 ± 0.24 s and LL-SHS: 4.67 ± 0.28 s for females. The results for the VHS were: right lateral VHS (RL-VHS): 5.52 ± 0.28 v (vertebrae units) left lateral (LL-VHS): 5.55 ± 0.28 v and dorsoventral VHS (DV-VHS): 6.22 ± 0.34 v for males and RL-VHS: 5.24 ± 0.2 v LL-VHS: 5.25 ± 0.20 v and DV-VHS: 5.97 ± 0.35 v for females. Results: Most of the cardiac measurements were significantly different between males and females. Cardiac measurements were also correlated to VHS and the cardiac dimension in the same projection. The measurements were made on right lateral, left lateral, ventrodorsal, and dorsoventral projections, using OsiriX MD medical imaging software, to evaluate sex effect and variance within the different heart scales. Methods: Forty healthy pet ferrets ( Mustela putorius furo) were used in this prospective study.

Objectives: To adapt the vertebral heart scale (VHS) for use in ferrets and identify new scales and tools that allow to establish the normal heart size by means of radiography more quickly and effectively.

2Departamento de Produccion Animal y Ciencia de los Alimentos, Universidad de Extremadura, Caceres, Spain.1Departamento de Medicina Animal, Facultad de Veterinaria, Universidad de Extremadura, Caceres, Spain.

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