The Horse

MAR 2019

The Horse:Your Guide To Equine Health Care provides monthly equine health care information to horse owners, breeders, veterinarians, barn/farm managers, trainer/riding instructors, and others involved in the hands-on care of the horse.

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A8 March 2019 The Horse | AAEP Wrap-Up MICHELLE ANDERSON ALEXANDRA BECKSTETT ERICA LARSON E ach year at the AAEP convention, three veterinarians review their picks for the top equine studies pub- lished in the past year. The 2018 edition of this session, called the Kester News Hour, featured Wes Sutter, DVM, MS, Dipl. ACVS, a surgeon at Rood & Riddle Equine Hospital in Lexington, Kentucky, presenting on lameness and surgery stud- ies; Regina Turner, VMD, PhD, Dipl. ACT, chief of the Section of Reproduction and Behavior at the University of Pennsylva- nia's (Penn Vet) New Bolton Center, in Kennett Square, on reproduction; and Rob MacKay, BVSc, PhD, Dipl. ACVIM, a professor of large animal internal medi- cine at the University of Florida's College of Veterinary Medicine, in Gainesville, on medicine. RLP Duration: Finding the Sweet Spot Equine vets use regional limb perfu- sion (RLP) to treat lower limb injuries and infections. Due to the area's limited blood supply, they place a tourniquet and inject antibiotics into a vein below it to deliver drugs where they need to go for a specified time. But finding a balance be- tween allowing enough time for the drug to reach appropriate levels and not treat- ing longer than necessary is challenging. University of California, Davis, re- searchers evaluated the time it takes for the antibiotic amikacin to reach peak synovial concentration in healthy adult coffin joints via RLP with a tourniquet placed just above the knee. Concentra- tions peaked 15 minutes after administra- tion, then began to decrease, suggesting this is an ideal RLP time for this drug. MRI to Diagnose Hock Lesions Colorado State University vets studied MRIs of 125 limbs on 103 horses to bet- ter describe injuries to the distal tarsus (lower hock joints), proximal metatarsus (upper hind-limb cannon bone), and sur- rounding structures. They knew 73 limbs had a blocking (diagnostic analgesia) history and abnormal MRIs. Blocking had localized 73% of lesions to the high suspensory ligament (numbing that area made the horses go sound); MRI revealed a major distal tarsus abnormality in 47% of these. Sutter's take-home: Nearly half the horses with lameness localized to the high suspensory had lower hock injury, imply- ing the block was specific for this region. Tieback Surgery: Anatomy and Risks An international research team described the anatomy of the equine esophageal entrance and assessed the risk of penetrating its layers during laryngoplasty (tieback surgery). This is a common treatment for recurrent laryn- geal neuropathy (roaring) that involves placing one or two very strong sutures be- tween the base of the arytenoid cartilage and the cricoid cartilage (the ring around the trachea). The team dissected cadaver horses to describe the area's anatomy. Then, surgeons performed laryngoplasty on the cadavers; two of the three didn't know the researchers were studying surgical risks. Sutter said the team confirmed it's pos- sible to puncture the esophageal entrance tissue layers during surgery and that bet- ter familiarity with anatomy can reduce the risk. He also noted that infection, difficulty swallowing, and chronic cough are com- mon laryngoplasty complications, with these punctures as possible causes. COURTESY AAEP The Top Equine Studies of 2018 Dr. Wes Sutter (right) shared the year's top lameness and surgery studies, while Drs. Robert MacKay and Regina Turner covered medicine and reproduction, respectively.

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