Investigation and inquest
The family requested me to refer to the deceased as Ellen. I will reflect that in this report. Ellen was 24 at the time of her death.
I conducted an inquest into the death of Ellen Mercer which concluded on 10th of April 2024. I recorded a narrative conclusion as follows:
Ellen’s death was caused by nitrous oxide use and immobility, which led to the development of pulmonary emboli.
Circumstances of the death
Ellen Mercer attended Wexham Park Hospital, Slough in Berkshire, arriving by ambulance in the early hours of 9 February 2023. The starting point for her deterioration and hospital attendance was her mental health and her use of nitrous oxide. The canisters she used had caused injuries to her legs and decreased her mobility.
Ellen arrived at Wexham Park Hospital at 00.48. She died there almost exactly 24 hours later, in the emergency department. No formal VTE risk assessment took place.
A post mortem examination revealed that her cause of death was :
1a Bilateral Pulmonary Artery Thromboembolus
1b Deep Vein Thrombosis
2 Long term complications of nitrous oxide abuse, including immobility
Coroner’s concerns
1. Patients are unfortunately waiting increasingly longer times in emergency departments – not just in waiting areas, but also after being seen by clinical staff and waiting for admission to a ward or discharge from the hospital. During this time, current policies do not require VTE risk assessment.
2. The policy for this trust suggests that the 24 hour period (during which VTE risk assessment must take place) starts only when a patient is “admitted” to hospital, i.e. when a decision is taken to admit them to a ward – which could be many hours after they have originally attended the emergency department.
3. The policy as currently drafted implies that VTE risk assessment is essentially not relevant for emergency department patients.
4. If current policies require VTE risk assessment to take place within 24 hours, the point at which that 24 hour period starts is not sufficiently clear and does not take long waits in emergency departments into account. I am concerned that policies may need to reflect the current reality on the ground.
5. I suspect that this issue may be a national one.