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Title: Ultrasonographic evaluation of adrenal gland size in two body weight categories of healthy adult cats
Authors: Pérez López, Laura Del Carmen 
Wägner, Ana María 
Saavedra Santana, Pedro 
Jaber, José Raduán 
Melián Limiñana, Carlos 
UNESCO Clasification: 310907 Patología
320502 Endocrinología
Keywords: Adrenal Gland Thickness
Body Weight
Reference Interval
Issue Date: 2021
Project: A grant from Consejo Social of the University of Las Palmas de Gran Canaria helped with the measurement of some of the biochemical parameters
Journal: Journal of Feline Medicine and Surgery 
Abstract: Objectives: Adrenal gland size and its association with body weight have been rarely evaluated in cats. This study was undertaken to assess the association between feline body weight and adrenal gland thickness, and to propose reference intervals (RIs) for adrenal gland thickness in healthy cats. Methods: This was a cross-sectional study in which 39 healthy cats were included. The cats were divided into two weight categories, classified as ⩽4.0 kg and >4–8 kg of ideal body weight (with 13 and 26 cats in each group, respectively), which took into consideration the body condition score of the cats. All cats underwent an ultrasound examination that was taken from a subcostal position. Maximum dorsoventral thicknesses of the left (MTL) and right (MTR) adrenal glands were measured in a sagittal plane. RIs were obtained for the maximum thickness (MT), which included the MTLs and MTRs of each cat. RIs with the 90% confidence intervals were calculated according to American Society for Veterinary Clinical Pathology guidelines on RIs. Results: No statistical differences for adrenal gland thickness were observed between the left and right (P = 0.543) adrenal glands or between male and female cats (P = 0.943). Mean MT was significantly greater in the group of cats weighing >4–8 kg compared with the group of cats weighing ⩽4 kg (3.7 ± 0.6 vs 3.2 ± 0.4 mm; P <0.005). The lower limit of the RI for MT was 2.4 mm (range 2.2–2.6 mm) in the group weighing ⩽4 kg and 2.6 mm (range 2.4–2.8 mm) in the group weighing >4–8 kg. The upper limit of the RI for MT was 3.9 mm (range 3.7–4.1 mm) in the group of cats weighing ⩽4 kg and 4.8 mm (range 4.6–5.1 mm) in the group of cats weighing >4–8 kg. Conclusions and relevance: The use of RIs based on two group sizes allows for a more accurate ultrasonographic evaluation of adrenal gland thickness in cats. The maximum normal adrenal gland thickness is lower in smaller cats (3.9 mm for those weighing ⩽4 kg and 4.8 mm for those weighing >4–8 kg).
ISSN: 1098-612X
DOI: 10.1177/1098612X20974962
Source: Journal of Feline Medicine and Surgery [ISSN 1098-612X], v. 23(8), p. 804-808
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