Stroke Expert Witness and Vascular Neurology Review

Stroke cases can be difficult to review because many of the important decisions happen quickly, often with incomplete information. By the time a case is evaluated later, the diagnosis and outcome are already known. The treating team did not have that benefit.

A useful review therefore starts with what was known at the time, what treatment options were actually available, and whether a different course of care would likely have changed the neurologic outcome.

Dr. Cheung reviews the record in sequence, including the history before hospital presentation when relevant, emergency evaluation, neurologic assessment, imaging, treatment decisions, transfer, subsequent deterioration, and the remainder of the hospital course.

The goal is to understand the case as it unfolded rather than judge an isolated decision with the benefit of hindsight.

Acute ischemic stroke is the central focus of Dr. Cheung’s clinical practice.

Medical-legal questions may involve whether the patient’s symptoms were reasonably recognizable as stroke, how the neurologic examination was interpreted, when the patient was last known well, whether the presentation was changing, and whether additional evaluation or treatment should reasonably have been considered.

Not every neurologic deficit is caused by ischemic stroke, and not every stroke presents in the same way. Stroke mimics, fluctuating symptoms, posterior circulation presentations, and changes in the neurologic examination can all affect the decisions available to the treating team.

For that reason, the review considers the entire clinical picture rather than relying on a single symptom, one imaging result, or the diagnosis that became clear later.

Questions involving thrombolysis and mechanical thrombectomy require more than determining that a patient ultimately had an ischemic stroke.

Dr. Cheung reviews the information available when those treatment decisions were being made, including symptom timing, neurologic findings, imaging, treatment eligibility, potential contraindications, evidence of large vessel occlusion, and the resources available at the treating hospital.

This may include decisions involving thrombolytic therapy with alteplase or tenecteplase, evaluation for mechanical thrombectomy, recognition of large vessel occlusion, and transfer to a center capable of providing a higher level of stroke care.

An alleged missed or delayed treatment opportunity also becomes a causation question. Even if a delay occurred, it is still necessary to determine whether the patient was actually eligible for the treatment in question and whether receiving it earlier would likely have changed the neurologic outcome.

Time matters in acute stroke, but the timeline has to be reconstructed accurately and interpreted in context.

Important events may include symptom onset or last known well, recognition by family or emergency personnel, emergency department arrival, initial neurologic assessment, stroke activation, imaging acquisition, specialist consultation, treatment decisions, transfer discussions, departure from the referring hospital, arrival at the receiving center, and subsequent intervention.

Dr. Cheung reviews those events together with the neurologic examination and imaging rather than treating each timestamp as an isolated data point.

Interfacility transfer can be particularly important when a hospital does not have the resources required for thrombectomy, neurosurgical care, neurocritical care, or another higher level of neurologic treatment.

The relevant question is not simply whether a transfer took time. The review may need to determine whether the decisions made during that period were reasonable, whether earlier transfer would have changed treatment eligibility, and whether any alleged delay materially affected the neurologic outcome.

Neuroimaging is most useful when it is interpreted together with the neurologic examination and the clinical timeline.

Dr. Cheung reviews relevant CT, CT angiography, CT perfusion, and MRI studies as part of the medical record to evaluate diagnosis, vascular findings, treatment considerations, progression of injury, and the relationship between imaging and the patient’s clinical course.

In an ischemic stroke case, imaging may help clarify whether there was hemorrhage, a large vessel occlusion, established infarction, potentially salvageable tissue, or subsequent progression of cerebral injury.

Serial imaging may also be important because later studies can help show how the stroke evolved and when injury became more established.

The imaging is therefore not reviewed in isolation. It is placed back into the clinical timeline and considered in the context of the decisions available to the treating physicians at each stage of care.

Dr. Cheung’s vascular neurology practice also includes intracerebral hemorrhage and other acute cerebrovascular emergencies.

These cases may involve questions regarding recognition of hemorrhage, neurologic deterioration, blood pressure management, anticoagulant-associated bleeding, reversal of anticoagulation, transfer for a higher level of care, and the need for neurosurgical or neurocritical care evaluation.

As with ischemic stroke, the analysis depends on the information available at the time, the severity and location of the underlying neurologic injury, and whether different care would likely have changed the patient’s course.

Acute stroke treatment depends not only on an individual physician but also on the system in which that physician is working.

As Stroke Medical Director at a Comprehensive Stroke Center, Dr. Cheung is involved in hospital and system-wide stroke protocols, hyperacute treatment pathways, quality measures, and the clinical processes used in stroke care.

Medical-legal review may therefore include the interaction between emergency department evaluation, stroke-team activation, imaging workflows, neurologic consultation, thrombolytic treatment, thrombectomy evaluation, interfacility transfer, escalation of care, and communication between treating teams.

A systems issue and an individual clinical decision are not necessarily the same question. When that distinction matters, Dr. Cheung evaluates both.

He also serves as an investigator on multiple stroke clinical trials, with research interests that include acute stroke treatment and novel approaches to secondary stroke prevention.

Standard of care and causation are related, but they are not the same question.

A standard-of-care analysis asks whether the evaluation and treatment were reasonable under the clinical circumstances that existed at the time.

A causation analysis asks a different question: whether an alleged delay, missed diagnosis, or treatment decision actually changed the patient’s neurologic outcome.

That distinction can be particularly important in stroke.

A patient may have had a severe stroke despite appropriate care. An earlier diagnosis does not necessarily mean that a particular treatment would have been available. A treatment opportunity may have existed without establishing that the treatment would probably have changed the final degree of neurologic injury.

There are also cases in which timing, treatment eligibility, or progression of disease becomes central to understanding the outcome.

Dr. Cheung evaluates these questions separately, considering the natural history and severity of the underlying stroke, available treatment opportunities, imaging findings, progression of injury, subsequent neurologic course, and the medical literature and clinical guidelines relevant to the case.

Where the available record does not support a conclusion, he identifies that limitation rather than forcing one.

Depending on the facts of the matter, stroke review may address questions such as:

• Was the patient’s presentation reasonably recognizable as an acute stroke?
• What was known about symptom onset or last known well?
• Was thrombolytic treatment appropriately considered?
• Was there evidence of a large vessel occlusion?
• Was mechanical thrombectomy evaluation appropriate?
• Was transfer to a higher level of stroke care reasonably timely?
• Did an alleged delay actually change treatment eligibility?
• What do the CT, CTA, CTP, or MRI studies show in the context of the clinical timeline?
• When did neurologic injury become established or progress?
• Was subsequent neurologic deterioration reasonably recognized and addressed?
• Was the care consistent with accepted stroke practice under the circumstances?
• Would different care likely have changed the degree of neurologic injury or disability?

The specific questions depend on the medical record. An adverse neurologic outcome by itself does not establish either a deviation from the standard of care or causation.

Through Crux Neurology, Dr. Cheung provides:

• Early case screening and consultation
• Medical record review
• Clinical timeline reconstruction
• Neuroimaging review
• Standard-of-care analysis
• Neurologic causation analysis
• Review of opposing expert opinions
• Written expert opinions and reports
• Deposition testimony
• Trial testimony

Medical-legal consulting and expert witness services are provided through Crux Neurology, PLLC.

Dr. Cheung is board-certified in Neurology and Vascular Neurology and practices as a neurohospitalist with a primary focus on acute stroke and other neurologic emergencies.

He serves as Stroke Medical Director at a Comprehensive Stroke Center and has more than six years of independent clinical practice. His current clinical work includes acute stroke diagnosis and treatment, thrombolytic decision-making, mechanical thrombectomy evaluation, neuroimaging review, interfacility transfer, neurologic deterioration, and stroke systems of care.

His Neurology residency and Vascular Neurology fellowship were completed at the University of Texas Southwestern Medical Center in Dallas, where he also served as Chief Resident during his final year of residency.

Learn more about Ryan Cheung, DO →

Attorneys, insurers, and other professional organizations may contact Crux Neurology regarding a potential stroke matter.

Every inquiry is reviewed. CV and fee schedule materials will be sent following review.

Please do not submit protected health information, patient names, medical records, or other confidential case information through the initial inquiry form.