Shadow of complications in neurosurgery

While the present definition of “complication” is “a circumstance that complicates something,” it is fundamental and prone to unintended interpretation. It does not adequately distinguish between inherent risks, mitigable events, and truly preventable errors, leading to ambiguity and misclassification[1].

The term “complication” is often vague and subjective. There is no general agreement on what really counts as a “complication,” an expected outcome, or a “sequela.” This ambiguity leads to a conflation of unavoidable risks and genuine errors and complicates efforts to learn, measure quality, and improve care. Given the morbidity of neurosurgical adverse events, paralysis, cognitive loss, or death, clearer language is urgently needed not just academically, but for patient safety and progress.

The psychological impact of “complication” terminology on neurosurgeons

The term “complication” not only describes a problem but often comes across as an accusation. This blanket labeling significantly contributes to the “second victim” phenomenon, where neurosurgeons themselves suffer greatly after an adverse event[2]. Over 90% of neurosurgeons are deeply concerned about their patients, and more than 60% struggle with feelings of guilt, anxiety, and profound disappointment even when they had no control over the events. Experience significant doubt, some surgeons become overly cautious or risk-averse; others suffer from depression or even suicidal thoughts. The expectation to cope with it alone makes it worse[3].

The term “complication” acts as a hidden trap. It indicates fault and deviation, wrongly blaming the surgeon for issues that may be unavoidable or based on the system itself. The fear of being blamed silences free debate and reporting since surgeons’ fear career consequences or emotional distress. We urgently need to move from fault-finding to fact-finding. Creating psychological safety through clearer, fairer language is about more than just protecting surgeons’ well-being; it is the foundation of learning, quality improvement, and patient safety. Everyone gains from surgeons being able to speak honestly and freely.

Bridging the gap: speaking to patients about risk

To patients, the word “complication” often sounds like “mistake.” This misunderstanding is made worse when doctors and studies use the term inconsistently[4]. While patients, nurses, and physicians usually agree on how serious a condition is, they often differ in how they describe risk. Saying a side effect is “uncommon” is far less clear than explaining it affects “3 out of 100 people.” Terms like “rare” or “unlikely” mean different things to different people—but numbers like “3%” are much clearer and more consistent.

This communication gap undermines truly informed consent. Patients cannot make meaningful decisions regarding their care unless they completely understand the hazards. Clear communication requires straightforward language; avoid complex jargon such as “complication”; describe what might actually happen (e.g., “infection” or “bleeding”). Clear numbers of specific probabilities (like “1% chance”) instead of vague terms (“rare”) and use visual aids or decision guides proven to boost understanding and reduce confusion.

Better, patient-focused language is not just polite but is essential. It builds trust, meets ethical obligations, and sets realistic expectations. When patients utterly understand the risks upfront, both they and their surgeons are better equipped to manage challenges if they arise.

Limitations of current severity classification: focusing on intervention over outcome

Current classification systems, such as Clavien-Dindo, are simple yet have significant gaps in the high-stakes field of neurosurgery[5]. They neglect the important reason behind an occurrence. Was the error avoidable or unavoidable? They overlook issues that arise during the surgery itself. Worse, they assess severity solely by the treatment needed to correct it (e.g., “Did it need another operation?”), completely disregarding the actual injury to the patient (e.g., “Did it cause permanent paralysis?”).

The constant focus on “what fixed it” rather than “why it broke” obscures the facts. Consider a patient who develops a new, debilitating neurological deficit that alters their life forever. Under current standards, if it does not require invasive treatment, it may be classified as “mild,” which distorts its true severity. What was the result? We cannot truly learn from mistakes or effectively target improvements. A helpful system must answer three key questions: Was this a preventable incident? What actually went wrong? How negative was the patient’s real-life outcome? Without this understanding, we will be perpetually trapped in addressing symptoms (the “what”) while neglecting the underlying cause (the “why”)^[6-8].

Proposal: the neurosurgical adverse event spectrum (NAES)

The cumulative deficiencies identified terminological ambiguity, Individual culpability focus impeding psychological safety, suboptimal risk communication with patients, and inadequate severity assessment in current classification systems, necessitate a reconceptualized framework. Guided by the fundamental principles of transparency and patient-centered care, we propose the Neurosurgical Adverse Event Spectrum (NAES), a novel classification framework designed to provide a more comprehensive, actionable, and ethically sound approach to identifying, categorizing, and communicating adverse events in brain and spine surgery. It develops from a single “complication” designation to a more comprehensive examination. The NAES replaces the imprecise “complication” classification with a three-tiered approach that emphasizes why things happen rather than what happened. This transition is critical to both learning and justice.

Inherent risks: “sometimes, bad things happen even when everything goes perfectly”

Unavoidable outcomes related to anatomy, disease, or recognized operation hazards, such as edema after removing a brain tumor near crucial locations.

Mitigable Events: “Better skill and attention can reduce the risk, but not erase it.” Risks are decreased by technique, attentiveness, or technology, such as a spinal fluid leak during difficult spine surgery. Meticulous closure decreases the risk but cannot ensure zero leakage.

Systemic Vulnerabilities: “This should not have occurred.” The system failed. Preventable errors are caused by human error, procedural gaps, or organizational defects, such as incorrect-level surgery due to poor planning or communication breakdowns.

Stop blaming individuals for unavoidable dangers, NAES, and focus on addressing the most pressing issues. Patient discussions about inherent dangers should be more transparent. Mitigatable occurrences necessitate sharper skills. Systemic issues necessitate system-wide fixes. This framework prioritizes systemic learning over individual blame, advancing safety culture (Table 1).

Table 1.

Proposed neurosurgical adverse event spectrum (causality & preventability framework)

NAES category	Definition	Neurosurgical examples
Inherent risk (unavoidable)	Events intrinsic to the patient’s pathology, anatomy, or the known, irreducible risks of the procedure, even with optimal care. Often considered “sequelae.”	Post-resection edema in eloquent cortex after tumor removal; transient neurological deficits after complex AVM resection in motor cortex; expected post-operative pain/fatigue.
Mitigatable event	Events where optimal technique, pre-operative optimization, intraoperative vigilance, or technological adjuncts can significantly reduce, but not eliminate, the risk.	Dural tear in revision spine surgery; minor vascular injury in aneurysm clipping; CSF leak; post-operative infection (reduced by sterile techniques); intraoperative bleeding; position-related nerve palsies.
Systemic vulnerability (preventable)	Events linked to deviations from standard care, human factors (lapses, errors), or organizational/systemic deficiencies. Direct targets for quality improvement.	Wrong-level surgery; implant malposition due to poor planning; medication errors; equipment failure; communication breakdowns; inadequate staffing/resources; surgeon fatigue; lack of proper training/supervision.

Current grading systems focus too much on the medical response and not enough on the human consequences. The NAES modifies this. By assessing not just the necessary treatment but also the neurological damage and the real-life impact on a patient’s independence and well-being, it ensures that the true severity of a problem is understood from both the clinician’s and, more importantly, the patient’s perspectives (Table 2).

Table 2.

Conceptual NAES—severity & functional impact grading.

NAES severity grade	Therapeutic intervention required	Neurological impact	Functional outcome (long-term)	Illustrative neurosurgical examples
Grade 0	None	None	No impact on QoL/Autonomy	Uneventful recovery.
Grade I	None (e.g., analgesics, antiemetics, physiotherapy)	Transient/Fully Recovered	No impact on QoL/Autonomy	Mild headache resolving with medication; transient nausea.
Grade II	Pharmacological (e.g., antibiotics, blood transfusion, TPN)	Minor Persistent Deficit	Minor functional limitation	Wound infection requiring oral antibiotics; mild, persistent sensory deficit.
Grade IIIa	Minor Invasive (e.g., bedside drainage, endoscopy without GA)	Minor Persistent Deficit	Moderate functional limitation/reduced autonomy (Barthel Index score 60–80)	Seroma requiring aspiration; persistent mild weakness affecting fine motor skills.
Grade IIIb	Major Invasive (e.g., re-operation under GA, interventional radiology)	Major Persistent Deficit	Moderate functional limitation/reduced autonomy (Barthel Index score 60–80)	Hematoma requiring surgical evacuation; persistent hemiparesis requiring an assistive device.
Grade IVa	Life-threatening, Single Organ Failure (ICU management)	Severe/Life-Altering Deficit	Severe functional limitations/dependent (Barthel Index score 21–80)	Post-op stroke with severe aphasia requiring ICU; single organ dysfunction (e.g., renal failure).
Grade IVb	Life-threatening, Multi-Organ Failure (ICU management)	Severe/Life-Altering Deficit	Severe functional limitations/Total Dependency (Barthel Index score 0–20)	Multi-organ dysfunction requires a prolonged ICU stay.
Grade V	Death	Death	Death	Postoperative death.

When things go wrong in neurosurgery, it is rarely due to a single mistake. It is frequently a complex web of hidden traps within the system, such as inadequate communication, a lack of resources, or confusing protocols. Pursuing individual culpability is resource-intensive and ineffective. Instead, we need to find facts rather than faults.

The NAES uses established methods to dive into four crucial areas:

1. Team Culture: “Do people feel safe speaking up? Is it encouraged to share mistakes?

2. Things to consider: “Did we have enough staff, the right tools, and working tech?”

3. Processes: “Was the checklist clear?” Did communication break down?

4. Human Limits: “Was fatigue, stress, or inexperience a factor?”

Treating “errors” as symptoms of underlying system faults eliminates the toxic blame game. It turns terrifying experiences into meaningful teachings. By addressing the underlying culture, resources, and processes, we can create stronger, safer neurosurgery. Adopting NAES does not just change the way we learn, communicate, and improve.

Safer Culture, Stronger Surgeons: By replacing vague “complications” with clear categories (Inherent Risk, Mitigatable Event, Systemic Vulnerability), NAES reduces stigma and fear. Surgeons can finally report issues openly without fear of disproportionate reprisal. Morbidity and mortality conferences shift from finger-pointing to problem-solving: “How do we fix this system?” instead of “Who messed up?” This protects the surgeon’s well-being and unlocks vital learning.

Truly Informed Patients, Real Trust: NAES provides surgeons with specific words to discuss risks. Instead of calling them “possible complications,” put it this way: “Because your tumor is near the speech area, there is a 3% inherent risk of temporary word-finding difficulty (Grade II impact).” Patients understand when presented with numbers and distinct classifications. This promotes trust and gives shared decisions meaning. Adopting NAES changes more than just the way we learn, communicate, and improve.

We urge collaborative validation trials and policy reforms to integrate NAES into national registries. The development and implementation of systems like NAES enhances patient safety while simultaneously supporting surgical teams and advancing neurosurgical practice.

Ethical approval

Ethics approval was not required for editorial.

Consent

Informed consent was not required for this editorial.

Sources of funding

Not applicable.

Author contributions

Study concept or design, data collection: S.A., B.C. Data analysis or interpretation, writing the paper: L.A.B.B., Y.B.R.

Conflicts of interest

None.

Guarantor

Bipin Chaurasia.

Research registration unique identifying number (UIN)

Not applicable.

Provenance and peer review

Ok.

Data availability statement

None.