Acoustic radiation force impulse elastography of the eyes of brachycephalic dogs

Abreu, Thaís Guimarães Morato; Feliciano, Marcus Antônio Rossi; Renzo, Roberta; Kobashigawa, Karina Kamachi; Chacaltana, Flor Diana Yocoay Claros; Crivelaro, Roberta Martins; Silveira, Camila Pinho Balthazar da; Cruz, Nathan R Neves; Aldrovani, Marcela; Maronezi, Marjury Cristina; Silva, Priscila Del Aguila da; Thiesen, Roberto; Laus, José Luiz

doi:10.1590/1678-4162-9498

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…After the qualitative analysis, three regions of interest, covering the entire length of the lens both in the cortex and in the nucleus were defined by positioning the caliper over these areas. Using this methodology, the software automatically calculates the shear wave velocity (SWV) in m/s of each region and the mean of which was calculated for statistical analysis (Abreu et al 2018).…”

Section: Methodsmentioning

confidence: 99%

“…In general, more rigid tissues suffer less deformity and after cessation of the applied force, the tissue returns to its original shape. This technique is performed in real-time, non-invasively, and more often does not require sedatives or anesthetics (Carvalho et al 2015, Abreu et al 2018. Currently there is no study that uses the elastography for the diagnosis of cataracts in animals or humans.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy of ARFI elastography in the differentiation of cataract stages in dogs

et al. 2021

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Objective was to evaluate the accuracy of elastography in the differentiation between normal and cataract lenses One hundred forty-five eyes of 98 dogs were divided into groups according to cataract stage. Forty-twoeyes were submitted to phacoemulsification. Biometric parameters, echogenicity and echotexture patterns of the anterior, posterior and vitreous chambers, lens and retina-choroid-sclera complexes were evaluated by ocular ultrasound in modes A and B. Deformability, and color (blue color = indicated less rigid structures, color red = more rigid structures) of the lenses were evaluated by the elastogram. The shear wave velocity (SWV; m/s) was calculated in three regions of the lens, both in the cortex and in the nucleus. The SWV of nucleus was statistically different between the normal lenses and with cataracts, and between the stages of cataract (P<0.001). Healthy lenses and incipient cataracts had a more rigid nucleus. Mature cataracts presented lowest nuclear rigidity (P<0.001). On cortical region the SWV was significantly higher (P<0.01) in intumescent and incipient cataracts. SWV less than 2.67m/s indicates cataract with a sensitivity of 72% and specificity of 94%. Values lower than 2.23m/s suggest mature cataract, with sensitivity of 71% and specificity of 76%. SWV greater than 2.66 m/s are associated with normal lenses or incipient cataract, presenting sensitivity of 94% and specificity of 84%. Qualitative method allowed differentiation between healthy and affected lenses and the classification of evolutionary stages. There was a correlation between the degree of stiffness of lens in cortical and nuclear regions (p=00165, r=0.37) and between the balanced saline solution quantitative and surgical time (P<0.01, r=0.73). Degree of stiffness of lens did not correlate with parameters of phacoemulsification. Elastographic proved feasible for evaluating the lens of dogs, characterizing the types of cataracts, and demonstrating increased stiffness of the diseased lenses.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accuracy of ARFI elastography in the differentiation of cataract stages in dogs

et al. 2021

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“…The same study observed high rigidity in lenticular capsules, shown in dark grey (Figure 3). ARFI elastography also showed loss of mosaic patterns in dogs with different degrees of cataract ( Figure 4) (ABREU et al, 2018). , showing lens, ciliary body, vitreous humor (A and B) and fundus of eye (C and D), of eye of the Shih Tzu dog breed.…”

Section: Elastographymentioning

confidence: 97%

Ultrasound methods used for planning for cataract surgery in dogs

Abreu

Feliciano

Uscátegui

et al. 2019

AVB

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Cataract is an important disease on veterinary ophthalmology. Different techniques facilitate the classification of the cataracts, adding information obtained by the conventional eye exam. This review discusses different modalities of ultrasonography methods available for diagnosis and surgical planning in dogs with cataracts. A-Mode ultrasound is used to evaluate thickness and length of the lens. B-Mode also has the capacity to evaluate features of echogenicity, echotexture, position of the lens and the identification of retinal and vitreous degenerations. The ultrasonic biomicroscopy is useful in assessing the anterior capsule and the positioning of the lens. The Doppler method it is useful to detection of vascular changes in patients with cataracts. The elastography method however allows measuring the lens rigidity, which is extremely important for planning and surgical prognosis.

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“…Ultrasonographic measurements are within known normality standards, although there is no variety of studies other than brachycephalic (Kobashigawa et al, 2015;Abreu et al, 2018).…”

Section: Arqmentioning

confidence: 99%

Ophthalmic parameters in adult Pomeranian dogs

Fachini

Kobashigawa

Madruga

et al. 2022

Arq. Bras. Med. Vet. Zootec.

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The objective of this study was to establish ophthalmic parameters in the Pomeranian dog breed. Schirmer tear test (STT), tear breakup time test (TBUTT), Jones test (JT), aesthesiometry, biomicroscopy, tonometry, non-contact specular microscopy (SM), ophthalmoscopy and ultrasonography (US) were carried out 48 eyes of 24 male and female Pomeranian dogs from a breeding kennel. Descriptive statistics was applied for data analysis. Means and standard errors found for STT, TBUT, JT, esthesiometry and tonometry were 24.310±0.448mm/min, 14.570±0.406s., 8.420±1.571min, 3.667±0.157cm and 17.960±0.697mmHg, respectively. For biomicroscopy, 43.75% of the eyes presented caruncle trichiasis, 25% chromodacryorrhea, 25% medial entropion and 10,42% distichiasis. SM showed endothelial cells density of 1958.285±36.760 cells/mm². For hexagonality, endothelial cells area and central corneal thickness were 62.229±2.183%, 519.231±9.853mm², 0.567±0.006mm, respectively. Ophthalmoscopy presented a pattern described in other breeds. Amelanotic fundus was reported in 8.33% of the eyes. The US means and standard errors for axial length of the eyeball, lens thickness, anterior and vitreous chamber depth were 16.859±0.148mm, 6.651±0.081mm, 2.673±0.091mm and 7.485±0.101mm. Mild changes in the lacrimal evaluation parameters were influenced by eyelid changes in STT type I. Increased corneal sensitivity was observed in the breed.

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Acoustic radiation force impulse elastography of the eyes of brachycephalic dogs

Cited by 3 publications

References 17 publications

Accuracy of ARFI elastography in the differentiation of cataract stages in dogs

Accuracy of ARFI elastography in the differentiation of cataract stages in dogs

Ultrasound methods used for planning for cataract surgery in dogs

Ophthalmic parameters in adult Pomeranian dogs

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