Anesthesia is one of the most consequential perioperative decisions made for a patient undergoing surgery. The choice of anesthetic technique, the management of its effects on the patient’s airway and cardiovascular system, and the discussion of the choice with the patient herself are all governed by a structured framework of professional standards. Where the choice is made in haste or without meaningful consideration of the alternatives, where the consequences of the chosen technique are not adequately managed, or where the patient is not given a real opportunity to participate in the decision, the framework supports a finding of negligence even where the underlying surgery was clinically indicated and urgent.
Crawford Estate v Aouida, 2025 NBKB 88, released by the Court of King’s Bench of New Brunswick on April 23, 2025, is a recent application of the framework. The patient, Ms. Darla Faye Crawford, was a 36-year-old woman with severe obesity and multiple comorbidities who developed sepsis from an obstructed kidney stone with pyelonephritis. Urgent surgery was clinically indicated. The anesthesiologist chose spinal anesthesia over general anesthesia. Shortly after the spinal anesthesia was tested and the patient was positioned for surgery, she went into respiratory arrest. She was resuscitated, the surgery was completed, and she was transferred to the intensive care unit. Six weeks later, after a course of progressive complications including kidney failure, fungal infection, and pressure ulcers, she died. The court found that the anesthesiologist had breached the standard of care in three independent ways and that the breaches directly caused her death.
The case is doctrinally important for several reasons. It is one of the clearest recent articulations of the anesthetic-choice framework in a high-risk patient context. It illustrates the application of the Reibl v Hughes informed consent framework specifically to the choice between general and spinal anesthesia. It addresses the “preparation versus management” question: an anesthesiologist who prepares for complications but fails to actually manage them when they occur has not satisfied the standard of care. And it adds the first New Brunswick case to the cluster of provincial anesthesia malpractice authorities.
The clinical context — anesthetic choice in the high-risk patient
A brief clinical overview is useful for the legal analysis.
General anesthesia. General anesthesia is a state of medically induced unconsciousness during which the patient does not feel pain, does not respond to surgical stimulation, and does not move. Modern general anesthesia typically involves intravenous induction agents (propofol, ketamine, or others), inhaled volatile anesthetics for maintenance, neuromuscular blocking agents to facilitate intubation and surgical access, and opioid or other analgesics. The patient’s airway is secured (typically by endotracheal intubation, sometimes by laryngeal mask airway) and ventilation is controlled by the anesthesia machine. The anesthesiologist maintains continuous monitoring throughout.
Spinal anesthesia. Spinal anesthesia (also called intrathecal anesthesia) involves injection of local anesthetic medication into the cerebrospinal fluid surrounding the spinal cord. The result is a temporary blockade of nerve conduction below the level of the injection. The patient remains awake (or lightly sedated) but does not feel surgical stimulation in the affected area. Spinal anesthesia is well-suited to lower abdominal, pelvic, and lower extremity surgery. The technique avoids airway instrumentation and the metabolic stress of general anesthesia. It has, however, predictable hemodynamic consequences.
The hemodynamic effects of spinal anesthesia. Local anesthetic in the cerebrospinal fluid blocks both sensory and motor nerves. It also blocks sympathetic nerves at the affected spinal levels. The sympathetic blockade produces vasodilation in the vascular beds below the block. The vasodilation can cause a substantial fall in blood pressure (hypotension). In healthy patients, the drop in blood pressure is typically modest and easily managed with intravenous fluids and (where needed) vasopressor medications. In high-risk patients (those with hemodynamic instability from sepsis, blood loss, or cardiac disease), the drop can be substantial and rapid. Anticipating and managing this effect is a core element of safe spinal anesthesia in high-risk patients.
The other major effect of high spinal anesthesia is on respiratory function. Where the level of the block extends high enough to affect the intercostal muscles or the diaphragm, the patient’s ability to breathe can be compromised. A “high spinal” or “total spinal” can cause respiratory arrest. The phenomenon is well-recognized and constitutes one of the recognized risks of the technique.
Severe obesity and airway management. Patients with severe obesity (body mass index 40 or greater, sometimes classified as “class III obesity” or historically as “morbid obesity”) present anesthesia challenges. The neck anatomy can make endotracheal intubation more difficult. The chest wall mechanics can make ventilation more difficult. The risk of perioperative hypoxia and aspiration is increased. Modern anesthesia practice has developed structured approaches to these challenges including specific intubation algorithms (difficult airway algorithms), specialized equipment (video laryngoscopes, supraglottic airway devices), and preparation for difficult intubation scenarios.
The presence of these challenges does not categorically rule out general anesthesia. The challenges inform the planning. Where general anesthesia is chosen for a high-risk obese patient, the anesthesiologist plans for the difficult airway, has appropriate equipment available, and may employ different induction techniques (awake fibreoptic intubation, for example) to manage the risk safely.
Sepsis and anesthetic decision-making. Patients with sepsis have hemodynamic instability arising from the systemic inflammatory response. The blood pressure may be borderline or already requiring vasopressor support. The cardiac output may be elevated (early sepsis) or impaired (late sepsis with cardiomyopathy). The patient’s response to anesthetic agents is unpredictable.
In a septic patient, the anesthetic plan must specifically address the hemodynamic considerations. General anesthesia can be conducted safely with careful titration of agents and continuous hemodynamic support. Spinal anesthesia in a septic patient is particularly delicate: the sympathetic blockade can produce an additional drop in already-unstable blood pressure, the underlying infection may be associated with bacteremia raising theoretical concerns about seeding the spinal canal, and the patient’s coagulation status (which can be affected by sepsis) is relevant to the safety of spinal procedures.
The “modified lithotomy” position. The modified lithotomy position is used for many lower abdominal and pelvic surgeries. The patient is supine, with the legs supported in elevated holders such that the hips are flexed. The position has hemodynamic implications: the elevation of the legs can shift blood centrally, which can affect cardiac filling and blood pressure. Where the patient already has a spinal anesthetic with its associated hemodynamic effects, the positional change can compound the hemodynamic effects.
The integration of these considerations. The anesthetic decision for a patient like Ms. Crawford (36 years old, severe obesity, comorbidities, developing sepsis from urinary tract source, requiring urgent surgery) is a complex one. The patient is a high-risk candidate for both general and spinal anesthesia. The choice between them requires consideration of:
- The relative risks of each technique in this specific patient
- The available equipment and team expertise
- The patient’s specific anatomical and physiological features
- The urgency of the surgery
- The patient’s own preferences after appropriate informed consent
There is no categorical answer. The standard of care requires a meaningful comparative analysis, documentation of the reasoning, and active management of whatever consequences flow from the chosen technique.
The facts
The patient. Ms. Darla Faye Crawford was 36 years old at the time of her presentation. She had severe obesity and multiple comorbidities.
The initial presentation. On May 13, 2016, Ms. Crawford presented to the Miramichi Regional Hospital emergency department with right flank pain. The clinical picture and the initial investigations pointed toward urinary tract pathology.
The diagnosis. A CT scan performed on May 14, 2016 revealed:
- An obstructive stone at the uretero-vesical junction (where the ureter joins the bladder)
- Signs of pyelonephritis (infection of the kidney)
- Early indications of a potential abscess
The clinical picture is the classic “obstructed infected kidney” scenario. The combination of urinary tract obstruction and infection creates a urological emergency: the infected urine cannot drain, the infection can ascend into the kidney parenchyma, and the patient is at high risk for progression to sepsis. The standard of care requires urgent drainage of the obstruction (typically by ureteral stent or percutaneous nephrostomy) along with antibiotic therapy.
The progression to sepsis. Within the first 12 hours of admission, Ms. Crawford’s condition deteriorated. The clinical features were consistent with the development of sepsis. The expert evidence at trial confirmed this trajectory.
The urological consultation and surgical plan. Ms. Crawford was referred to a urologist, Dr. Vonkeman, for urgent assessment. Dr. Vonkeman determined that immediate surgery was required to remove the obstructive stone and to place a double J ureteral stent (a thin tube that holds the ureter open and allows urine drainage from the kidney to the bladder, bypassing the obstruction).
The anesthesia consultation. Dr. Aouida, an anesthesiologist at the hospital, conducted the pre-operative anesthesia consultation. The assessment included review of the hospital records, history-taking, and physical examination including airway assessment.
Dr. Aouida agreed with the urologist that surgery needed to proceed urgently. He expressed concern about the challenges of intubation under general anesthesia given Ms. Crawford’s severe obesity, and concern about the increased likelihood of anesthetic complications. On that basis, Dr. Aouida concluded that spinal anesthesia was the most appropriate anesthetic technique.
The preparation. Dr. Aouida prepared for potential complications:
- A difficult intubation cart was set up (in case the spinal failed and general anesthesia became necessary)
- Vasopressors were prepared (in anticipation of the hypotension associated with spinal anesthesia)
The adverse event. Shortly after the spinal anesthesia was tested and Ms. Crawford was positioned in the modified lithotomy position for surgery, she went into respiratory arrest. An attempt to ventilate her was unsuccessful. A code blue was called. The Cardiorespiratory Intensive Care protocol was initiated. After resuscitation, spontaneous circulation was restored.
The completion of surgery and ICU transfer. Once Ms. Crawford was stabilized, the surgery was completed and she was transferred to the intensive care unit. The surgical objective (stone removal and stent placement) was achieved.
The ICU course. Ms. Crawford’s ICU course was complicated by:
- Ongoing ventilation issues requiring several days of sedation
- Acute kidney failure
- Fungal infections
- Pressure ulcers
The pattern is the recognizable trajectory of a patient who has suffered a significant hypoxic-ischemic insult, who is critically ill from the underlying sepsis, and who is in the cascade of multi-organ dysfunction. The kidney failure may have been the original urological problem progressing to acute kidney injury, the hypoxic insult contributing further, or both. The fungal infection is a common complication of critical illness with prolonged antibiotic exposure. The pressure ulcers reflect the prolonged immobility.
The death. Ms. Crawford died on June 24, 2016, approximately six weeks after her initial presentation.
The action. The plaintiff, acting as administrator of Ms. Crawford’s estate, brought an action against Dr. Aouida alleging negligence in the administration of spinal anesthesia. The principal allegations were:
- Failure to take appropriate precautions despite the known risk factors (obesity, sepsis)
- Disregard of the increased risks of spinal anesthesia in patients with these comorbidities
- Failure to properly inform Ms. Crawford of the risks of spinal anesthesia
- Failure to manage the foreseeable cardiovascular consequences of the chosen technique
The legal framework
The case engages two interrelated frameworks: the standard of care for anesthesiologists and the informed consent framework.
The standard of care for anesthesiologists. The standard of practice for an anesthesiologist is that of a reasonable anesthesiologist in similar circumstances (the Wilson v Swanson, [1956] SCR 804 and ter Neuzen v Korn, [1995] 3 SCR 674 framework). The standard is not perfection. The standard is the level of skill and care that would be expected of a reasonable specialist in the field. The trier of fact assesses the standard against expert evidence about how reasonable anesthesiologists would have approached the relevant clinical decisions.
In the context of anesthetic choice, the standard typically requires the anesthesiologist to:
- Consider the available anesthetic techniques (general, spinal, regional, or combinations)
- Assess the relative risks and benefits of each in the specific patient
- Reach a reasoned conclusion about the most appropriate choice
- Document the reasoning
- Implement the chosen technique with the appropriate precautions
- Manage the predictable consequences of the technique throughout the procedure
In the context of the technical execution of an anesthetic, the standard requires:
- Proper preparation (equipment, medications, team)
- Appropriate monitoring
- Continuous vigilance throughout
- Active management of the predictable physiological effects of the technique
- Prompt response to unexpected events
The informed consent framework. The Supreme Court of Canada framework for informed consent in Hopp v Lepp, [1980] 2 SCR 192 and Reibl v Hughes, [1980] 2 SCR 880 requires the physician to disclose to the patient the material, special, or unusual risks of a proposed treatment, the available alternatives, and the consequences of not treating. The disclosure must be sufficient to permit the patient to make an informed decision. The framework applies the modified objective test: would a reasonable person in the patient’s position have made a different decision had the disclosure been adequate?
The framework applies specifically to anesthetic choice. Where two anesthetic techniques are available and the comparative risks and benefits matter, the patient is entitled to be informed of both options and to participate in the decision. The framework is doctrinally consistent across Canadian malpractice law and applies in New Brunswick the same way it applies in Ontario, British Columbia, or any other province.
The court’s findings
The court found three independent breaches of the standard of care, each of which alone would have supported a negligence finding.
Failure to meaningfully consider general anesthesia. The court found that Dr. Aouida had not meaningfully considered general anesthesia as an option. The challenges of intubation in a patient with severe obesity (which Dr. Aouida had identified as the basis for his choice of spinal anesthesia) were real challenges but did not categorically rule out general anesthesia. Modern anesthesia practice has structured approaches to difficult airway management. The standard of care required the anesthesiologist to weigh the relative risks of general anesthesia (with its difficult airway considerations) against the relative risks of spinal anesthesia (with its hemodynamic effects in a septic patient). The court found that this analysis had not been meaningfully undertaken.
The doctrinal significance: the framework requires comparative analysis between available techniques, not a defensive choice that avoids one risk at the expense of insufficient consideration of the other. The anesthesiologist who chooses Technique A because Technique B is “too risky” must still articulate why Technique A is actually safer in the specific clinical context.
Failure to properly manage the foreseeable consequences of spinal anesthesia. Once the choice of spinal anesthesia was made, the standard of care required active management of its foreseeable consequences. The principal consequences in a high-risk patient include:
- Hypotension from sympathetic blockade and vasodilation
- Potential for the block to extend higher than intended, with respiratory consequences
- Patient positioning effects on hemodynamics
The court found that the management of these consequences was inadequate. The preparation alone (the difficult intubation cart, the vasopressors) did not satisfy the standard. The standard required active management: appropriate monitoring during induction and positioning, ready and active blood pressure support, vigilance for early signs of high block, and prompt response when the patient’s status deteriorated.
The doctrinal significance: preparation for complications is not equivalent to managing them. The framework requires actual management of the predictable consequences, with monitoring and intervention as they unfold.
Failure to obtain informed consent. The court found that Dr. Aouida had not adequately informed Ms. Crawford of the benefits of general anesthesia as an alternative. The framework requires that the patient be presented with the available options, their respective risks and benefits, and the reasoning for the recommended choice. Where the disclosure does not include the alternative with its corresponding analysis, the patient cannot meaningfully participate in the decision.
The doctrinal significance: the informed consent framework applies to anesthetic choice with the same force as it applies to surgical choice. The framework requires a substantive discussion that allows the patient to make an informed decision, not just a brief description of the chosen technique.
Causation. The court found that the breaches directly caused Ms. Crawford’s respiratory arrest and the subsequent cascade leading to her death. The framework operates through the standard balance-of-probabilities causation analysis, with consideration of:
- The hypoxic-ischemic insult from the respiratory arrest
- The progression through ICU complications
- The ultimate death six weeks later
The combination of breaches (inadequate consideration of general anesthesia; inadequate management of the spinal anesthesia consequences; inadequate informed consent) supported the causation finding. With appropriate care, the cascade that led to Ms. Crawford’s death would not have occurred on the balance of probabilities.
The doctrinal anchors
Several doctrinal anchors emerge from the case.
The anesthetic-choice framework. The choice between available anesthetic techniques is a structured analytical exercise that requires comparative consideration of the relative risks and benefits in the specific patient. The framework does not permit a defensive choice that avoids one risk at the cost of insufficient analysis of the alternative. Crawford makes the framework explicit in a plaintiff-favourable trial decision.
The “preparation versus management” distinction. Preparation for complications (setting up the difficult intubation cart, drawing up vasopressors) is necessary but not sufficient. The standard of care requires actual management of the complications as they unfold: monitoring, intervention, and dynamic response. Crawford is the principal cluster authority on the distinction.
The informed consent framework in anesthesia. The Reibl v Hughes framework applies to anesthetic choice with the same force as it applies to surgical choice. The patient is entitled to be informed of the available options and to participate in the decision. Where the disclosure does not include adequate information about the alternatives, the framework supports a finding of breach. Crawford joins the broader informed consent cluster on the application of the modified objective test to anesthetic decisions.
The high-risk patient framework. Patients with severe obesity, sepsis, multiple comorbidities, or other high-risk features require particular care in the anesthetic decision. The framework recognizes that the standard of care is calibrated to the patient’s specific circumstances. A high-risk patient is not entitled to perfect care, but is entitled to care that reflects the specific challenges and the specific tools available to address them.
The morbid obesity and difficult airway framework. Severe obesity is a recognized perioperative risk factor. Modern anesthesia practice has structured approaches to managing it. The challenges do not categorically rule out general anesthesia; they inform the planning. The framework supports a comparative analysis of techniques rather than a categorical rejection of one technique based on its specific challenges.
The sepsis and anesthetic hemodynamics framework. Patients with sepsis have hemodynamic instability that affects anesthetic management. The framework requires specific consideration of how the chosen anesthetic technique will interact with the septic physiology. Spinal anesthesia, with its sympathetic blockade and vasodilation, has particular risks in septic patients that the management plan must address.
The cascade-from-arrest-to-death framework. Where a patient suffers a significant intraoperative hypoxic-ischemic event and then progresses through a cascade of complications culminating in death weeks later, the causation analysis can support the death finding even with the temporal distance. The framework requires consideration of the cascade as a whole and the contribution of the original event to the trajectory.
The three-independent-breach pattern. Where the court finds multiple independent breaches of the standard of care, each of which alone would support the negligence finding, the causation analysis is correspondingly stronger. The framework supports a finding even where any one breach considered alone might leave room for alternative explanations. Crawford illustrates the framework operating with three independent breaches.
The New Brunswick application of federal frameworks. The substantive frameworks of Canadian malpractice law (the Wilson v Swanson standard of care; the Reibl v Hughes informed consent framework; the Snell v Farrell and Clements v Clements causation frameworks) apply consistently across Canadian provinces. Crawford applies these frameworks in New Brunswick the same way they would apply in Ontario. The doctrinal alignment across jurisdictions on the substantive frameworks of Canadian malpractice law is one of the consistent features of the modern field.
Why this case matters
For families considering similar cases. Anesthesia complications are an uncommon but recognized category of malpractice claim. The framework that Crawford applies is helpful for understanding when these claims are viable.
Some practical observations:
Anesthetic choice is a substantive medical decision. The choice between general and spinal anesthesia (or between other available techniques) is not just a technical preference. It is a substantive medical decision that has significant implications for the patient’s safety. Where the choice is made without meaningful comparative analysis or without adequate informed consent, the framework supports a finding of breach.
Preparation is necessary but not sufficient. An anesthesiologist who prepares for complications but fails to actively manage them when they occur has not satisfied the standard. The framework requires both the preparation and the active management.
Informed consent in anesthesia is substantive. The patient is entitled to a real discussion of the available anesthetic options, their respective risks and benefits, and the reasoning for the recommended choice. A brief description of the chosen technique is not adequate. Where this discussion did not occur, the informed consent framework supports a finding of breach.
Catastrophic anesthesia events have long causation chains. A patient who suffers a hypoxic-ischemic insult during anesthesia can have a clinical course that extends weeks before reaching the final outcome. The causation analysis can support the death finding even with the temporal distance, provided the cascade is traceable to the original event.
For more on the general framework for evaluating these cases, see Suing for Medical Malpractice in Ontario: What You Need to Know.
For physicians and clinical teams. A few practical observations:
Document the comparative analysis. The framework for anesthetic choice expects a documented comparative analysis of the available techniques. The documentation supports the standard of care analysis and provides the foundation for the informed consent discussion.
Active management is the standard. Preparation is the floor, not the ceiling. The framework requires active management of the predictable consequences of the chosen technique throughout the procedure. The monitoring, the intervention, and the dynamic response are all part of the standard.
Engage the patient meaningfully in the decision. Where two anesthetic techniques have meaningfully different risk profiles, the patient is entitled to participate in the choice. The framework supports a substantive discussion that allows the patient to make an informed decision.
The high-risk patient deserves particular care. Severe obesity, sepsis, multiple comorbidities, and other high-risk features require careful planning and execution. The framework does not require perfect outcomes; it requires care that is calibrated to the specific patient.
Decision Date: April 23, 2025
Jurisdiction: Court of King’s Bench of New Brunswick
Outcome: Judgment in favour of the plaintiff. The court found that the defendant anesthesiologist breached the standard of care in three independent ways: (1) by failing to meaningfully consider general anesthesia as an option and largely disregarding its potential benefits; (2) by failing to properly manage the foreseeable hemodynamic and respiratory consequences of the spinal anesthesia once that choice was made, including inadequate monitoring and cardiovascular support; and (3) by inadequately informing the patient of the benefits of general anesthesia, rendering her unable to make an informed decision about the anesthetic choice. The court further found that these breaches directly caused Ms. Crawford’s respiratory arrest during the spinal anesthesia administration, the subsequent hypoxic-ischemic insult and ICU course, and her death approximately six weeks later.
Key authorities: Wilson v Swanson, [1956] SCR 804 (standard for specialists); Crits v Sylvester, [1956] OR 132 (standard of care for medical practitioners); ter Neuzen v Korn, [1995] 3 SCR 674 (specialist standard); Hopp v Lepp, [1980] 2 SCR 192 and Reibl v Hughes, [1980] 2 SCR 880 (informed consent); Snell v Farrell, [1990] 2 SCR 311 (causation); Clements v Clements, 2012 SCC 32 (but-for causation framework).
