When the treatment window closes.
Stroke is the most time-sensitive medical emergency in modern medicine. Treatment that is given in time can mean full recovery. Treatment given even an hour late can mean permanent disability or death. Paul Cahill represents Ontario patients and families harmed when strokes are missed at triage, dismissed as something else, or treated too late to make a difference.
Not every stroke is missed because of negligence. Some present in subtle, atypical ways. Posterior circulation strokes look like vertigo. Younger patients are not on the typical risk profile. Symptoms can fluctuate. Ontario law accounts for all of this. The legal question is not whether the diagnosis was hard. It is whether the clinician did what a reasonably competent practitioner would have done in the same circumstances: apply BE-FAST screening, order timely imaging, consult neurology, activate Code Stroke when indicated.
In stroke medicine there is a saying: time is brain. The brain loses about 1.9 million neurons every minute a stroke goes untreated.
That biology drives the law in these cases. The treatment window for clot-busting drugs (tPA) is generally 3 to 4.5 hours from symptom onset. Mechanical thrombectomy can be effective up to 24 hours in select patients. Outside those windows, the brain damage is largely permanent. When negligence causes the window to close, the harm is irreversible, and the law allows the patient or family to seek accountability.
These are the patterns Paul most commonly investigates. The presence of one of them does not, by itself, prove malpractice, but it is often the starting point for a meaningful legal review.
Facial droop, arm weakness, speech changes, or sudden visual loss not properly assessed using BE-FAST screening, often because the patient does not fit the expected profile.
Stroke symptoms attributed to less serious conditions, particularly in younger patients, women, and those presenting with isolated dizziness or balance problems.
Stroke protocol calls for door-to-CT within 25 minutes. Delays in obtaining imaging push patients past the window for thrombolytic and endovascular treatment.
Code Stroke protocols mobilize neurology, imaging, and treatment teams simultaneously. Failure to activate the protocol when symptoms warrant costs critical minutes.
Tissue plasminogen activator must generally be administered within 3 to 4.5 hours of symptom onset. Delays in workup, consultation, or decision-making routinely push patients past eligibility.
Mechanical thrombectomy can be effective up to 24 hours after onset for select patients with large-vessel occlusions. Failure to identify candidates or transfer to a stroke centre is a recurring problem.
Transient ischemic attacks resolve within hours but signal high near-term stroke risk. Discharging a TIA patient without workup and prevention misses the chance to stop the larger event.
Patients with atrial fibrillation, recent surgery, or known stroke risk who deteriorate in hospital and are not promptly recognized or treated when stroke symptoms develop.
Three legal elements must be proven on a balance of probabilities. In stroke cases, the timeline of every minute is the central evidence.
That the ER physician, triage nurse, neurologist, or radiologist failed to do what reasonably competent practitioners would have done. Stroke care has well-defined protocols (BE-FAST, Code Stroke, door-to-CT, door-to-needle) and these benchmarks are used by experts to assess care.
That timely diagnosis and treatment would have led to a better neurological outcome. Causation in stroke is supported by published outcomes data: patients treated earlier in the window have substantially better recovery rates than those treated later or not at all.
The compensable harm caused by the breach: lifelong care needs for a patient with permanent neurological injury, lost income, lost capacity, pain and suffering, and the impact on family caregivers who become long-term care providers.
Stroke claims are time-line cases. The minute-by-minute reconstruction of what happened (and when) is what wins or loses them. That demands a particular kind of preparation.
Symptom-onset time, arrival time, triage time, CT time, neurology consult time, treatment decision time. Each of these has to be reconstructed from records, witness accounts, and EMS reports. Documentation is often inconsistent or imprecise about timing in exactly the way that matters most.
The defence will argue the stroke would have caused the same damage regardless of treatment. To rebut this, the case needs expert evidence on what the patient's outcome would have been if treated earlier, drawing on published outcomes data, the patient's specific stroke type, and individual factors like age and comorbidities.
A stroke case typically needs a neurologist, an emergency physician, and a neuroradiologist as expert witnesses, each speaking to a different element. Securing experts of this calibre is difficult, expensive, and a meaningful obstacle for many lawyers taking on these cases.
Doctors are defended by the Canadian Medical Protective Association (CMPA), hospitals by HIROC. Both have substantial resources and a long-standing practice of defending strong cases at trial. Settlements are not freely offered, particularly when the defence sees a viable causation argument.
Ontario's Limitations Act, 2002 generally requires civil claims to be commenced within two years of when the injury and its likely cause are discovered or should reasonably have been discovered. Stroke records, EMS reports, and timing data degrade quickly, and witness recollections fade. Earlier review preserves your evidence and your options.
Stroke cases reward meticulous timeline reconstruction, neuroscience expertise, and a credible willingness to take complex causation to trial. Paul is built for all three.
Jury award in a birth injury case demonstrating Paul's willingness and ability to take complex medical claims through to trial.
Recognized by the Law Society of Ontario as a Certified Specialist in Civil Litigation, a designation held by a small fraction of Ontario lawyers.
Listed in Best Lawyers in Canada for Medical Negligence and Personal Injury Litigation, 2021 through 2026.
Retained as trial counsel by other Ontario lawyers on complex medical negligence files, a peer recognition of trial readiness.
Free, confidential consultations. Paul reviews every potential stroke case personally and tells you honestly whether it merits investigation. No pressure. No obligation.
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