Coronial
QLDmental health

Inquest into the death of Tiesha Marie Derbyshire

Deceased

Tiesha Marie Derbyshire

Demographics

18y, female

Date of death

2021-01-30

Finding date

2026-01-29

Cause of death

Mixed drug toxicity

AI-generated summary

Tiesha Marie Derbyshire, an 18-year-old with complex mental health conditions including eating disorder, PTSD, and borderline personality disorder, died from mixed drug toxicity after intentionally overdosing on propranolol while admitted to an acute mental health unit under involuntary treatment. She had a documented history of medication stockpiling and multiple overdose attempts. Key clinical lessons: (1) propranolol and similar cardioactive medications pose particular risks in patients with eating disorders due to cardiovascular complications and high overdose lethality; (2) staged medication dispensing (weekly rather than 100-tablet supplies) should be considered for high-risk patients; (3) communication gaps between GPs and mental health services hampered coordinated care, as Tiesha 'doctor-shopped' to obtain medications; (4) invasive searching on admission was not undertaken due to her sexual trauma history, though this prevented discovery of concealed propranolol; (5) the therapeutic relationship and human rights considerations must be balanced against safety risks. The coroner found no systemic failures by individual clinicians but noted system-level improvements needed in GP-psychiatry communication and search procedure clarity.

AI-generated summary and tagging — may contain inaccuracies; refer to original finding for legal purposes.

Specialties

psychiatrygeneral practiceemergency medicine

Error types

communicationsystem

Drugs involved

propranololfluvoxaminediazepamlorazepamolanzapinequetiapinealprazolam

Clinical conditions

anorexia nervosa with bingingadjustment disorder with depressed moodpost-traumatic stress disorderborderline personality disorderunspecified anxiety disordersomatic symptom disordersubstance use disorderpostural orthostatic tachycardia syndromepostural hypotensionpostural tachycardiairon deficiency anaemiaECG changes secondary to eating disorderchronic suicidal ideationmixed drug toxicity

Procedures

nasogastric tube feeding

Contributing factors

  • Intentional overdose of propranolol (200 tablets)
  • Access to large quantities of propranolol prescribed by multiple GPs
  • Medication stockpiling behaviour
  • Concurrent use of multiple psychotropic medications at therapeutic or elevated levels
  • Failure to detect concealed medication on admission despite high documented suicide risk
  • Communication gaps between GP prescribers and mental health services
  • Patient's secretive and resourceful nature in obtaining medications
  • Doctor-shopping across multiple GP practices to obtain medications

Coroner's recommendations

  1. A copy of the findings be provided to the Deputy Secretary of Primary and Community Care Group, Australian Government Department of Health and Aged Care, to highlight to Primary Health Networks the need for system integration improvement and uptake of existing Medicare-funded case conferencing initiatives
  2. The Chair of the Royal Australian College of GPs (Queensland) be provided with a copy of the findings to highlight availability of case conferencing capability to Fellows
  3. The Office of the Chief Psychiatrist and Queensland Health be encouraged to take an active role in highlighting the availability of case conferencing initiative in statewide communications to services
  4. Publication of findings in the public domain to educate providers about utilisation of quality improvement initiatives for GP-psychiatry coordination
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