Monitoring acute equine visceral pain with the Equine Utrecht University Scale for Composite Pain Assessment (EQUUS-COMPASS) and the Equine Utrecht University Scale for Facial Assessment of Pain (EQUUS-FAP): A validation study.
Authors: VanDierendonck Machteld C, van Loon Johannes P A M
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary: EQUUS-COMPASS and EQUUS-FAP Pain Scales for Acute Equine Colic Quantifying visceral pain in horses with colic remains clinically challenging, yet accurate assessment directly influences treatment decisions and welfare outcomes. VanDierendonck and van Loon validated two newly developed observational pain scales—EQUUS-COMPASS (a composite assessment combining multiple pain indicators) and EQUUS-FAP (a facial expression-based tool)—in a cohort of 46 horses, comparing 23 acute colic cases against 23 healthy controls, with stratification between medically managed and surgically treated animals. Both scales demonstrated strong discriminatory capacity, with EQUUS-COMPASS achieving 87% sensitivity and 71% specificity, whilst EQUUS-FAP showed 77% sensitivity and notably high specificity at 100%, and neither required weighted scoring of parameters to maintain diagnostic performance. These validated tools offer farriers, veterinarians and equine physiotherapists objective, reproducible frameworks for pain monitoring during acute episodes—particularly valuable for identifying animals requiring escalated intervention and tracking analgesic efficacy during recovery, though practical adoption will depend on their ease of use in field settings compared to existing assessment methods.
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Practical Takeaways
- •EQUUS-FAP offers excellent specificity (100%) for confirming colic diagnosis, making it particularly useful as a screening tool to rule out pain when negative
- •EQUUS-COMPASS provides superior sensitivity (87%) and may be more practical for detecting subtle pain in colic cases requiring careful monitoring
- •Both scales are validated tools that can help predict severity and treatment requirements (medical vs. surgical) in acute equine colic
Key Findings
- •EQUUS-COMPASS showed 87% sensitivity and 71% specificity in differentiating horses with colic from healthy controls
- •EQUUS-FAP showed 77% sensitivity and 100% specificity for acute colic detection
- •Both pain scales significantly differentiated between conservatively treated colic cases and those requiring surgery or euthanasia
- •Weighting factors applied to individual parameters did not substantially alter the sensitivity and specificity of either scale