ϵ-Aminocaproic acid (EACA) is a lysine analogue antifibrinolytic drug used to treat bleeding disorders in humans and domestic animals. Use in zoological medicine is rare and dose recommendations are anecdotal, but EACA may be a valuable therapeutic option for bleeding disorders in exotic species, including Asian elephants (Elephas maximus). This study used an in vitro model of hyperfibrinolysis and a thromboelastograph-based assay to estimate the therapeutic plasma concentration of EACA in Asian elephants (61.5 μg/ml, 95% CI = 34.6–88.5 μg/ml). Substantial but incomplete inhibition of lysis was seen at relatively low concentrations of EACA (40 μg/ml). Asian elephants appear sensitive to EACA-mediated inhibition of hyperfibrinolysis. Doses published for domestic animals, targeting higher plasma concentrations, may be inappropriate in this species.
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