An Explorative Study of Haemostasis in Canine Steroid-Responsive Meningitis-Arteritis Using Viscoelastic Monitoring.

Canine steroid-responsive meningitis-arteritis (SRMA) is a systemic, immune-mediated, inflammatory disease which occasionally leads to spontaneous haemorrhage, both within and outside the central nervous system, as a possible complication. No previous studies have investigated the haemostatic profile in a cohort of dogs with SRMA using viscoelastic monitoring. The aim of this study was to assess haemostatic function in a cohort of dogs affected by SRMA using the Entegrion VCM (Viscoelastic Coagulation Monitor) Vet™ device. This was a multicentre prospective study conducted between April 2023 and April 2025 recruiting dogs with SRMA from four veterinary referral hospitals in the United Kingdom. All four research centres used the Entegrion VCM Vet™ device for evaluation of haemostasis. Twenty dogs were included in the study. One dog had a hypercoagulable VCM result, and two dogs were considered hyperfibrinolytic based on their VCM results. No dogs had any clinical signs of vascular complications (ischaemic and/or haemorrhagic stroke, haematomas, or haemorrhages). Although the pathophysiology of vascular events in dogs with SRMA remains unclear, the results of this study suggest that further investigations into the fibrinolytic system and endothelial structure in dogs affected by SRMA are warranted.