Evaluation of hoof wall surface temperature as an index of digital vascular perfusion during the prodromal and acute phases of carbohydrate-induced laminitis in horses.
Authors: Hood, Wagner, Brumbaugh
Journal: American journal of veterinary research
Summary
# Editorial Summary Hood, Wagner and Brumbaugh's 2001 research established hoof wall surface temperature (HWST) as a reliable proxy for digital vascular perfusion by systematically validating the technique across three experimental conditions: environmental temperature acclimation, acute vascular occlusion via tourniquet application, and carbohydrate-induced laminitis in 30 horses. Using thermal measurement under controlled conditions, the authors demonstrated that HWST responds predictably to vascular changes—decreasing significantly during arterial occlusion and recovering during reperfusion—whilst also accounting for thermoregulatory confounders such as environmental acclimation. Most importantly, they identified digital hypothermia as a consistent marker during the prodromal phase of carbohydrate-induced laminitis, suggesting reduced digital blood flow or metabolic activity precedes acute laminar failure. For practitioners, these findings indicate that monitoring digit temperature may provide an early warning system during suspected laminitis risk periods, potentially creating a narrow therapeutic window for vasodilatory or perfusion-enhancing interventions before irreversible laminar damage occurs—though the technique requires careful standardisation of measurement conditions to avoid false interpretation from environmental influences.
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Practical Takeaways
- •HWST measurement provides a non-invasive, practical way to assess digital circulation in horses, particularly useful for detecting early vascular compromise during the prodromal laminitis phase.
- •Digital hypothermia detected early in laminitis development suggests a therapeutic window for intervention with perfusion-enhancing agents before acute phase damage occurs.
- •Environmental temperature and acclimation status significantly affect baseline HWST values, so these factors must be controlled when using this technique clinically.
Key Findings
- •Hoof wall surface temperature (HWST) significantly decreases during arterial occlusion and increases during reperfusion, validating HWST as an indirect indicator of digital perfusion.
- •Hot-acclimatized horses challenged with cold had significantly lower mean HWST than cold-acclimatized horses at all timepoints.
- •Digital hypothermia was observed during the prodromal phase of carbohydrate-induced laminitis, consistent with decreased digital vascular perfusion or metabolic activity.
- •Transient episodes of high HWST occurred during prolonged cold-induced vasoconstriction, suggesting compensatory vascular responses.