Key result
Geriatric age links to higher intrarenal vascular resistance and reduced flow velocities on renal Doppler.
Why the study?
The physiological effects of aging on renal hemodynamics in dogs are not yet well defined.
Does aging alter renal hemodynamic parameters measured by Doppler ultrasonography in healthy small-breed dogs?
Observational (n=58)
Does aging alter renal hemodynamic parameters measured by Doppler ultrasonography in healthy small-breed dogs?
Characterizes physiological age-related renal hemodynamic changes in small-breed dogs using Doppler ultrasonography to aid in distinguishing normal aging from early renal vascular pathology.
Answers are grounded in this paper and cite their sources.
Age-related Doppler shifts in healthy geriatric dogs warrant age-adjusted norms; leaves open whether parameters aid pathology detection in clinical practice.
The physiological effects of aging on renal hemodynamics in dogs are not yet well defined. This prospective analytical study aimed to evaluate renal aging using Doppler ultrasonography by comparing renal hemodynamic parameters between healthy young adult and healthy geriatric small-breed dogs. Fifty-eight healthy small-breed dogs (≤10 kg) were divided into two groups (young adult and geriatric) and underwent renal Doppler ultrasonography to compare renal hemodynamic parameters between groups. A total of 116 kidneys were evaluated. Age-related hemodynamic changes were identified. Geriatric dogs exhibited lower aortic peak systolic velocity (PSV) and main renal artery end-diastolic velocity, as well as higher intrarenal resistive and pulsatility indices, compared with young adults. In addition, a trend towards lower PSV and higher resistive index in the main renal arteries, along with a higher renal-to-aortic ratio, was observed in geriatric dogs. These findings may provide valuable complementary information during routine ultrasonographic evaluation, contributing to the early detection of renal vascular alterations, monitoring of disease progression, and assessment of therapeutic response in renal disorders. Furthermore, they may support future research into renal vascular physiology and pathology.
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Álvarez et al. (2026) conducted an observational in Renal aging in healthy small-breed dogs (n=58). Geriatric age evaluated by renal Doppler ultrasonography vs. Healthy young adult small-breed dogs was evaluated on Renal hemodynamic parameters on Doppler ultrasonography (aortic PSV, main renal artery end-diastolic velocity, intrarenal resistive and pulsatility indices). Geriatric dogs exhibited lower aortic peak systolic and main renal artery end-diastolic velocities, alongside higher intrarenal resistive and pulsatility indices than young adults across 116 kidneys.
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