The potent vasodilator, ATP-MgCl2 was infused continuously into the distal phalanx of the left forefoot of six Standardbred racehorses for 48 h via intra-osseous infusion to promote persistent digital hyperthermia. The right forefoot was infused with saline solution and acted as an internal control. Clinical signs of lameness at the walk were not detected at 0 h, 24 h or 48 h post-infusion. Mean 卤 SE hoof wall temperatures of the left forefoot (29.4 卤 0.25 掳C) were higher (P < 0.05) than those on the right (27.5 卤 0.38 掳C). Serum insulin (15.0 卤 2.89 渭IU/mL) and blood glucose (5.4 卤 0.22 mM) concentrations remained unchanged during the experiment. Histopathological evidence of laminitis was not detected in any horse.
The results demonstrated that digital vasodilation up to 30 掳C for a period of 48 h does not trigger laminitis in the absence of hyperinsulinaemia. Thus, although digital hyperthermia may play a role in the pathogenesis of laminitis, it is not the sole mechanism involved.