Intravenous Regional Limb Perfusion in Standing and Recumbent Horses: A Comparative Radiographic Study.
Authors: Garcia Adriana F S, Dória Renata G S, Arantes Julia A, Reginato Gustavo M, Neubauer Fernanda G, Ribeiro Gesiane
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Intravenous Regional Limb Perfusion Position Matters Intravenous regional limb perfusion (IRLP) is a valuable technique for delivering high drug concentrations to infected or inflamed equine limb tissues, yet clinical practice has remained unclear about whether performing the procedure in standing versus recumbent horses affects actual drug distribution. Using radiographic contrast as a perfusion marker, researchers administered IRLP via the cephalic vein in ten horses under two conditions—standing with sedation and recumbent under general anaesthesia—with a two-week interval between treatments, capturing sequential radiographic images over 50 minutes. Contrast reached the hooves significantly faster in standing horses (114 ± 15 seconds versus 236 ± 29 seconds), with standing animals also demonstrating more uniform vascular distribution and greater soft tissue uptake throughout the imaging period, whilst recumbent horses showed preferential lateral digital vein pooling with reduced hoof perfusion. These findings suggest that performing IRLP in standing position substantially improves drug delivery efficiency and tissue penetration—practical knowledge that could optimise therapeutic outcomes in orthopedic infections where adequate antimicrobial penetration is critical, though clinicians must weigh perfusion advantages against the safety and restraint challenges of standing procedures in compromised horses.
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Practical Takeaways
- •Perform intravenous regional limb perfusion (IRLP) in standing, sedated horses rather than under general anesthesia and recumbency to achieve faster and more uniform drug delivery to infected tissues
- •Standing position IRLP delivers medication more effectively to distal structures including the hooves, which is critical for treating deep orthopedic infections in the foot
- •Consider horse position as a modifiable variable to optimize therapeutic efficacy when treating orthopedic infections via regional perfusion techniques
Key Findings
- •Contrast reached the hooves 2.1 times faster in standing horses (114 ± 15 seconds) compared to recumbent horses (236 ± 29 seconds)
- •Standing position resulted in more uniform perfusion of limb vasculature, while recumbent position showed preferential deposition in the lateral digital vein with reduced hoof perfusion
- •Soft tissue radiopacity increased more markedly in standing animals from 10 minutes onward and persisted through 50 minutes
- •IRLP in standing position demonstrates superior pharmacokinetic distribution characteristics compared to recumbent positioning