JAVMA spotlights IV regional limb perfusion in anesthetized foals

JAVMA has published a technical tutorial video on intravenous regional limb perfusion in the anesthetized foal, giving clinicians a step-by-step guide to performing IVRLP through the cephalic or saphenous vein in patients from neonatal age to weaning that aren't suitable for standing, sedated procedures. The piece by P. David Wallace and Mike J. Schoonover packages a familiar equine infection-control technique into a neonatal-focused procedural resource, with emphasis on patient positioning, tourniquet placement, catheter choice, and perfusate preparation. (avma.org)

That focus is timely because IVRLP is well established in adult horses, but foals bring different practical and pharmacologic challenges. Reviews and reference texts have long described regional limb perfusion as a useful adjunct for septic arthritis, osteomyelitis, and localized limb sepsis in foals, especially when high local antimicrobial concentrations are needed in poorly perfused tissues. At the same time, neonatal sepsis remains a major cause of early foal death, and antimicrobial decisions are complicated by age-specific physiology, renal considerations, and changing bacterial susceptibility patterns. (onlinelibrary.wiley.com)

The tutorial’s core technique is straightforward: place a pneumatic or wide-rubber tourniquet around the proximal antebrachium or gaskin, dilute the chosen antimicrobial with physiologic saline to a total volume of 30 mL, and infuse it through a small catheter or butterfly set in the cephalic or saphenous vein. That approach aligns with broader equine IVRLP literature showing that effective perfusion depends heavily on basics such as proximal tourniquet placement, adequate occlusion, and practical tourniquet duration. Oklahoma State conference proceedings authored by Schoonover note that both pneumatic and wide-rubber tourniquets can be effective, narrow rubber tourniquets are not recommended, and 30 minutes remains a commonly used clinical target, even though some studies suggest shorter times may still achieve useful concentrations. (aaep.org)

The article also fits into a larger body of work from the same group on antimicrobial delivery in neonatal foals. In a 2025 JAVMA study, Wallace, Schoonover, and colleagues evaluated concurrent systemic amikacin plus IVRLP in healthy neonatal foals and found mean synovial fluid amikacin concentrations of 238.5 μg/mL at 30 minutes after perfusion and plasma concentrations of 66.3 μg/mL at 30 minutes after systemic dosing. The authors concluded the protocol could achieve therapeutic plasma and synovial concentrations, but they also reported variability, with some foals not reaching synovial targets in all joints studied. That nuance matters: a polished technique video may help reduce one source of variability, but it doesn't eliminate the pharmacokinetic uncertainty that can come with neonatal patients. (pubmed.ncbi.nlm.nih.gov)

Expert and industry commentary around IVRLP has generally emphasized exactly that point: technique is inseparable from outcome. A 2021 review of field applications described IVRLP as widely used for equine orthopedic infections, while a best-practices review highlighted key decision points including route, antimicrobial choice, dose, perfusate volume, tourniquet type, sedation versus anesthesia, and treatment frequency. The same review also cautioned that proving therapeutic concentrations in the intended tissue is difficult in clinical practice, which raises both efficacy questions and antimicrobial stewardship concerns. (pubmed.ncbi.nlm.nih.gov)

Why it matters: For veterinary professionals, this tutorial is useful because it addresses a narrow but high-stakes gap: how to perform IVRLP in small, often critically ill foals that are already anesthetized and may need aggressive local therapy for septic joints or bone infection. Foals aren't just small horses. Reviews of neonatal antimicrobial therapy note that first-line systemic treatment for sepsis often still centers on ampicillin plus an aminoglycoside, but bacterial profiles can shift during hospitalization, and use of protected antimicrobials should be justified by culture and susceptibility testing whenever possible. In that context, better execution of local delivery techniques may help clinicians maximize drug exposure at the site of infection while staying more disciplined about systemic antimicrobial escalation. (beva.onlinelibrary.wiley.com)

There’s also an operational angle. Older JAVMA guidance on regional limb perfusion noted that performing the procedure during general anesthesia can be practical when a horse is already anesthetized for joint lavage or surgical debridement, because movement is eliminated and clinician safety may improve. For foals that cannot tolerate a standing procedure, a neonatal-specific tutorial may help referral hospitals and equine practices standardize training across surgeons, anesthetists, house officers, and technicians. (avmajournals.avma.org)

What to watch: The next step is likely more outcomes-focused evidence, not just technique demonstration. Areas to watch include comparative data on forelimb versus hindlimb access, protocol refinements for different antimicrobials, and clinical studies tying IVRLP technique to survival, limb function, repeat-lavage rates, or antimicrobial use patterns in septic foals. Given the stewardship pressure around equine neonatal antimicrobials, any future work that links precise local delivery with reduced reliance on higher-priority systemic drugs will get attention. (pubmed.ncbi.nlm.nih.gov)