Coronial
NTother

Inquest into the death of John Roberts

Deceased

John Roberts

Demographics

37y, male

Date of death

2016-02-20

Finding date

2017-10-13

Cause of death

water intoxication and olanzapine toxicity in association with schizophrenia

AI-generated summary

A 37-year-old Aboriginal male prisoner with a long history of treatment-resistant schizophrenia died at the Darwin Correctional Precinct. He was on high-dose olanzapine (15mg twice daily) and zuclopenthixol when he developed acute water intoxication and died from a seizure. Toxicology revealed olanzapine concentration of 0.40mg/L, consistent with fatal overdose cases. He had reported excessive thirst and consumed large quantities of water in weeks before death. The coroner found his death resulted from combined water intoxication and olanzapine toxicity, with the precise mechanism difficult to separate. Care was deemed appropriate despite his rare presentation of psychogenic polydipsia (excessive water drinking), not yet well-recognised in custodial settings. Resuscitation attempts were hampered by excessive pulmonary fluid. The coroner found no causative failures in medical care but noted the Top End Health Service appropriately implemented improvements.

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

Specialties

psychiatryemergency medicinegeneral practicepathology

Drugs involved

olanzapinezuclopenthixol

Clinical conditions

schizophreniatreatment-resistant schizophreniawater intoxicationhyponatremiapsychogenic polydipsiaseizure

Procedures

airway managementsuctioncardiopulmonary resuscitation

Contributing factors

  • treatment-resistant schizophrenia
  • high-dose olanzapine therapy (15mg twice daily)
  • excessive water intake/psychogenic polydipsia
  • hyponatremia
  • zuclopenthixol co-medication
  • lack of early recognition of excessive water consumption as risk factor
  • pulmonary fluid aspiration complicating resuscitation
Full text

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