In March 2025, Paul Cahill settled a psychiatric negligence claim on behalf of a patient who was discharged from a hospital emergency department despite clinical signs of acute psychiatric illness that, on the standard of care, indicated the need for admission and treatment. Within 24 hours of discharge, the patient experienced a severe psychotic episode. During the episode, she sustained catastrophic injuries that left her paraplegic. The injuries also included multiple fractures and long-term medical complications that will require lifelong care. The case settled before trial. The terms are confidential.
A case of this kind sits at the intersection of two of the most difficult areas in medical malpractice litigation. The first is the emergency-department assessment of acute psychiatric illness, where the clinical task is to identify, in a time-limited encounter, a patient whose presentation may not include the markers of obvious dangerousness but who nevertheless requires admission. The second is the foreseeability analysis in psychiatric injury cases, where the harm that ultimately occurs is mediated by the patient’s own conduct during a period of illness and where the defence may argue that the chain of causation was not reasonably foreseeable. Ontario law on both questions is well-developed, and a case of this kind, when the public summary supports it, is one in which the breach and the causation analysis can both be made out.
The clinical context
Acute psychiatric illness encompasses a range of presentations that bring patients to emergency departments, including acute psychotic episodes (loss of contact with reality, often with delusions or hallucinations), severe mood episodes (acute major depressive episodes, manic episodes, mixed states), acute anxiety crises, and acute exacerbations of chronic psychiatric illness. Some of these presentations are accompanied by acute risk to the patient or to others; some are not. The clinical task in the emergency department is to identify which is which.
The published guidance from the Canadian Psychiatric Association, the Canadian Association of Emergency Physicians, and the American Psychiatric Association (often consulted in Canadian practice) describes a standard approach to the emergency-department assessment of acute psychiatric illness. The approach includes a focused psychiatric history (with particular attention to recent stressors, recent functional changes, prior psychiatric history, recent medication changes, and substance use), a mental status examination (with attention to mood, affect, thought content, thought process, perception, cognition, and insight), and a risk assessment. The risk assessment is the critical decision-making step: the clinician must decide whether the patient can be safely managed as an outpatient or whether admission is required.
The decision-making framework for admission of an acutely ill psychiatric patient in Ontario is shaped by the Mental Health Act, RSO 1990, c. M.7. The Act provides for two pathways to inpatient psychiatric admission. The first is voluntary admission, where the patient consents to admission and treatment. The second is involuntary admission, available where the clinical criteria are met and where the patient does not consent. The clinical criteria for involuntary admission include the patient’s likelihood of causing harm to self, the patient’s likelihood of causing harm to others, and the patient’s inability to care for themselves. The procedural framework includes Form 1 (an Application by Physician for Psychiatric Assessment, valid for 72 hours), Form 3 (a Certificate of Involuntary Admission, signed after the Form 1 assessment), Form 4 (Certificate of Renewal), and related procedural protections.
The standard of care for the emergency-department assessment of a psychiatric patient is not synonymous with the statutory criteria for involuntary admission. The standard of care is the standard of a reasonably prudent emergency physician or psychiatrist of equivalent training, assessed against the published guidance and the practice patterns that prevail. A patient who falls short of the legal threshold for involuntary admission may still be a patient whom the standard of care required to be admitted on a voluntary basis, or to be retained for further observation, or to be referred for urgent outpatient follow-up with specific protective arrangements. The published guidance recognizes that the decision to discharge an acutely ill psychiatric patient from the emergency department carries serious clinical risk and that the decision must be supported by a clinical assessment that documents the reasoning.
A particularly important concept in the standard-of-care analysis for psychiatric discharge decisions is the assessment of risk. The published guidance describes a structured approach to risk assessment that includes identification of dynamic risk factors (recent stressors, recent loss, recent psychiatric symptoms, recent functional decline), static risk factors (history of psychiatric illness, history of prior episodes of harm to self), and protective factors (social supports, engagement with treatment, treatment response). Where the risk assessment supports a conclusion that the patient is at elevated short-term risk, the standard of care generally requires either admission, structured outpatient follow-up with monitoring, or both. A discharge that occurs without an adequate risk assessment, or with a risk assessment that supports admission but is not acted upon, is the kind of clinical decision that may fall below the standard.
The patient and the breach
The patient was an adult woman experiencing acute psychiatric illness at the time she presented to the emergency department. The public summary describes her presentation as including “clear signs of acute psychiatric illness.” The summary does not specify the diagnosis, the presenting symptoms, or the specific clinical features that supported the case theory that admission was required, and the convention applied to confidential settlement reporting does not permit further description.
What the public summary does support is the following sequence:
- The patient was assessed in the emergency department.
- The clinical signs of acute psychiatric illness were present and (on the plaintiff’s case) sufficient to require admission and treatment under the standard of care.
- The patient was discharged.
- Within 24 hours of discharge, the patient experienced a severe psychotic episode.
- During the episode, the patient sustained catastrophic injuries through self-harm.
The clinical injuries were severe. The patient sustained spinal cord injuries causing paraplegia. She sustained multiple fractures. She has long-term medical complications that will require lifelong care.
The case theory turned on two related propositions. The first was that the clinical signs present at the time of the emergency-department assessment supported, on the applicable standard of care, a decision to admit rather than discharge. The second was that the acute psychotic episode and the self-harm injuries that followed were a foreseeable consequence of the failure to admit. The first is a standard-of-care question; the second is a foreseeability question.
The standard of care
Description of the standard of care for emergency-department psychiatric assessment is general background. The actual standard in any particular case requires expert evidence from an emergency physician or psychiatrist of equivalent training. With that caveat, the general consensus can be sketched.
The applicable standard for specialists in Canada is the Supreme Court of Canada’s formulation in Ter Neuzen v Korn, [1995] 3 SCR 674: a specialist is expected to exercise the degree of skill of an average specialist in the field. For emergency-department psychiatric assessment, the average specialist is generally understood to follow the published assessment frameworks (the focused history, the mental status examination, the structured risk assessment), to document the assessment in sufficient detail to support the disposition decision, and to apply the principles of the Mental Health Act where the criteria for involuntary admission are met.
Where the clinical signs present at the time of assessment support a finding of acute psychiatric illness with elevated short-term risk, the standard of care generally requires either admission, structured outpatient follow-up with appropriate monitoring, or both. The specific decision among these options requires clinical judgment and depends on the patient’s specific presentation, the available outpatient resources, and the patient’s social context. A reasonable specialist exercising clinical judgment is entitled to choose between admission and structured outpatient follow-up where both are reasonable options. The standard is generally not met, however, where the patient is discharged without an adequate risk assessment, where the documented risk assessment supports admission but is not acted upon, or where the discharge occurs without arrangements for follow-up that match the severity of the presenting illness.
In this case, the case theory was that the standard required admission. The expert evidence at trial would have addressed the specific clinical features that supported this conclusion. The settlement reached before trial reflects the parties’ assessment of how that expert evidence would have developed.
Foreseeability and causation
The causation analysis in psychiatric injury cases involves both factual and legal causation. The factual causation analysis applies the “but for” test from Clements v Clements, 2012 SCC 32: but for the breach, would the injury have occurred? The legal causation analysis applies the foreseeability test from Mustapha v Culligan of Canada Ltd., 2008 SCC 27: was the harm of a kind, type, or class that was reasonably foreseeable as a result of the breach?
The foreseeability analysis in a case where the immediate cause of the patient’s injuries was the patient’s own conduct during a psychotic episode is sometimes treated by defendants as a separate doctrinal hurdle. The argument is that the chain of causation included the patient’s actions during the episode and that those actions were not reasonably foreseeable. The Ontario Court of Appeal’s reasoning in Hacopian-Armen Estate v Mahmoud, 2021 ONCA 545, although decided in a delayed-cancer-diagnosis context, supplies the controlling framework: the foreseeability inquiry asks whether the harm is of a kind, type, or class that was reasonably foreseeable as a result of the breach, not whether the precise sequence of events was foreseeable. Applied to a psychiatric case, the question is whether harm of the relevant kind (injuries sustained during an acute psychiatric crisis) was foreseeable as a result of the failure to admit a patient whose clinical signs supported admission. The published psychiatric and emergency medicine literature treats injuries during acute psychotic episodes as a recognized risk of inadequately treated psychiatric illness. Where the breach is the failure to admit a patient at elevated short-term risk, harm sustained during an acute episode within the foreseeable short-term window is generally within the “same class or kind” of foreseeable harm.
Factual causation in this case rested on the temporal relationship between the discharge and the episode (within 24 hours), on the clinical evidence that admission would have prevented the episode (because the patient would have been in a hospital setting with appropriate monitoring and treatment), and on the absence of any intervening cause that would have broken the causal chain. The defence position would have explored whether each element of the counterfactual was established on the balance of probabilities. The settlement reflects the parties’ assessment of how the evidence on each of these questions would have developed at trial.
Damages
The damages in a case of this kind are among the most substantial in medical malpractice litigation. The patient is paraplegic at a relatively young age, with a long remaining life expectancy. The damages framework includes:
- Past medical costs: acute care for the spinal cord injury, surgical management of fractures, rehabilitation, mental health care, and the ongoing medical management of the complications of spinal cord injury (including the management of bowel and bladder function, the management of skin integrity, the management of cardiovascular and metabolic complications, and the management of chronic pain).
- Future medical costs: attendant care over the patient’s remaining life expectancy, the cost of mobility aids (a wheelchair, replacements at standard intervals, vehicle modifications, home modifications including ramps and bathroom adaptations), the cost of physiotherapy and rehabilitation over the long term, the cost of ongoing mental health care, and the cost of managing the predictable complications of paraplegia over time.
- Past and future loss of income: depending on the patient’s employment history and earning capacity, the loss of income claim can be substantial. A patient who was working at the time of the events and who is now unable to return to work has a damages claim that extends to her retirement age and may extend beyond depending on the structure of the loss.
- Loss of housekeeping and family services: the patient’s inability to perform her usual household activities is compensable.
- Pain and suffering: constrained by the Supreme Court of Canada’s “trilogy” cap on non-pecuniary general damages, which sets an upper limit in real-dollar terms for pain and suffering, loss of enjoyment of life, and loss of expectation of life. Catastrophic injury cases of this kind typically attract pain and suffering awards at or near the cap.
The total damages in a young paraplegic patient with significant future care needs can run into the millions of dollars. The settlement in this case was confidential, but the structure of the damages framework explains why catastrophic injury cases of this kind typically attract substantial settlements before trial.
The resolution
The matter resolved by settlement in March 2025. The settlement was reached before trial. The terms are confidential. The settlement reflects both parties’ assessment of the strengths and weaknesses of the standard-of-care and causation evidence, weighed against the magnitude of the damages and the risks and costs of trial.
Why this matters
For patients and families navigating an emergency-department presentation for acute psychiatric illness, the lesson is that the discharge decision is a clinical decision that the patient and the family are entitled to question. Where a patient or family member is told that a person with acute symptoms is being discharged with outpatient follow-up, the appropriate questions include: what was the documented risk assessment, what are the warning signs that the patient or family should watch for in the short term, what is the plan for follow-up, and who is available for urgent contact if symptoms worsen. A patient or family member who is concerned about a discharge decision is entitled to ask for a second opinion, to request that the patient be retained for further observation, or to ask whether involuntary admission criteria are being considered.
For emergency physicians and psychiatrists, the case illustrates the importance of documentation in the discharge decision. The clinical documentation of the risk assessment, the rationale for the disposition decision, and the follow-up arrangements is doctrinally important for both medical and litigation purposes. A discharge decision that is supported by a documented risk assessment and a clear follow-up plan is significantly more defensible than a discharge decision that lacks this documentation, even if the underlying clinical judgment was the same in both cases. The clinical reality of emergency-department workflow makes thorough documentation difficult; the legal reality is that documentation is the principal evidence of the clinical reasoning at the time the decision was made.
For the broader practice of medical malpractice litigation in Ontario, this case is the first explicitly psychiatric-negligence case in the notable-cases library. It joins the catastrophic-injury sub-cluster, which already includes the November 2022 orthopedic follow-up amputation settlement (where a system failure produced a below-knee amputation) and the esophageal intubation case (where an airway management failure produced a hypoxic brain injury). The three cases together illustrate the recurring pattern in catastrophic-injury litigation: the breach is a discrete clinical decision or system failure, the immediate clinical event is severe and irreversible, and the damages extend over the patient’s remaining life expectancy with substantial ongoing care needs.
For prospective clients who have experienced a catastrophic injury following an emergency-department or inpatient psychiatric encounter, the threshold question is whether the standard of care for the assessment and disposition decision was met. The records of the emergency-department visit, the inpatient stay, the discharge documentation, and the timing of subsequent events are the starting points for the analysis. The two-year limitation period in Ontario runs from the date the patient or family knew or ought to have known that the injury was caused by an act or omission of the defendant. In a case involving an adult patient who has sustained injuries during a psychiatric crisis, the analysis of when the limitation period began can be complex; cases of this kind are best evaluated by a malpractice lawyer at the earliest opportunity.
Settlement Date: March 2025
Settlement Type: Confidential settlement before trial
Counsel for the plaintiff: Paul J. Cahill
