management). Assays useda. Results must be interpreted in the context of the insulin assay used. (chemiluminescent assay, radioimmunoassay, or ELISA). Results. Results. Interpretationb. Recommendation. < 20 Î¼U/mL. Non-diagnostic. Dynamic test recommended to better assess. 20-50 Î¼U/mL. ID suspect. > 50 Î¼U/mL.
Recommendations for the Diagnosis and Treatment of Equine Metabolic Syndrome (EMS)
GROUP Recommendations for the Diagnosis and Treatment of Equine Metabolic Syndrome (EMS) June 2016 Prepared by the EMS Working Group Nicholas Frank (Group Coordinator; Tufts University), Simon Bailey (University of Melbourne), Andy Durham (Liphook Equine Hospital), Janice Kritchevsky (Purdue University), Nicola Menzies-Gow (Royal Veterinary College), and Lisa Tadros (Michigan State University)
Introduction Equine metabolic syndrome (EMS), which is characterized by insulin dysregulation, abnormal adipose distribution, and a high risk for laminitis, results from an interaction between genetics and environment. The risk of laminitis in the individual animal therefore depends on the relative weighting of genetic and environmental influences. We can identify high-genetic risk animals that develop EMS with only mild environmental influences, and early detection is essential in these animals. Other horses have a lower genetic influence, but can develop EMS through exposure to improper environments (diets that provide more calories than an animal requires and are high in non-structural carbohydrates). It might therefore be assumed that any horse can develop EMS if pushed far enough in the wrong direction by improper management and exposure to environmental factors. Epigenetic influences on gene expression might also further the development of EMS. The Equine Endocrinology Group (EEG) is composed of experts in the field of equine endocrinology who provide advice in the form of written guidelines to help veterinary practitioners diagnose and manage equine endocrine disorders. Guidelines are updated every two years or when new information becomes available, and can be found on the EEG web site: http://sites.tufts.edu/equineendogroup.
Table 1 – Definition of Terms Terms Insulin dysregulation (ID)
Any combination of fasting hyperinsulinemia, postprandial hyperinsulinemia (response to oral sugar test or consumed feeds), or tissue insulin resistance (IR).
Equine metabolic syndrome (EMS)
A clinical syndrome associated with an increased risk of laminitis that includes insulin dysregulation and any combination of increased generalized or regional adiposity, weight loss resistance, dyslipidemia, and altered adipokine concentrations.
GROUP Figure 1 – Algorithm for the diagnosis and management of EMS (June 2016) Horse, pony, or donkey presented for evaluation
Test for insulin dysregulation Refer to Tables 3 and 4
Manage obesity or PPID as appropriate
Clinical signs PPID
Typical (obese) EMS
EMS with PPID
Reduce body fat mass
Maintain body condition
Limit caloric intake Low-sugar/low-starch diet No grass Exercise
Lower sugar, lower starch, higher fat, good quality fiber diet Restrict access to grass Exercise
Lean Re-test insulin status to assess response Consider metformin treatment in refractory cases
Pergolide and diet appropriate for body fat mass (see boxes to the left)
GROUP Figure 2 – Algorithm for detection of insulin dysregulation (June 2016)
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