Ellen Mercer attended Wexham Park Hospital by ambulance in the early hours of 9 February 2023 after deterioration associated with her mental health, nitrous oxide use, leg injuries and reduced mobility. She died in the emergency department approximately 24 hours after arriving; a post-mortem examination identified bilateral pulmonary artery thromboembolus and deep vein thrombosis. The substantive concerns relate to the absence of a formal VTE risk assessment and uncertainty in hospital policies about when the 24-hour period for such an assessment begins, particularly for patients waiting in emergency departments.
Frimley Health NHS Foundation Trust
National Institute for Health and Care Excellence
NHS England