ICF Structural and Functional Impairments Following Craniotomy

ICF Framework Overview Applied to Craniotomy

1. Body Structures Impairment (ICF Chapter s1 - Nervous System)

s110 - Brain Structure

• Cortical tissue disruption at the surgical site (retraction injury, resection margins)
• White matter tract damage - particularly to association fibers, commissural fibers (corpus callosum), or projection tracts (corticospinal, thalamocortical)
• Cerebral edema - peri-operative brain swelling causing temporary structural distortion
• Contusion/hematoma at the operative site - epidural, subdural, or intracerebral hematoma post-operatively
• Infarction from vascular injury (compromise of perforating arteries, cortical veins)
• Gliosis/scarring at resection margins (scar tissue formation leading to later epileptogenesis)
• Hydrocephalus from impaired CSF flow (meningeal scarring, aqueductal stenosis post-surgery)
• Pneumocephalus - intracranial air causing mass effect

s120 - Spinal Cord and Related Structures

• Relevant in posterior fossa craniotomies involving the cervicomedullary junction or foramen magnum approaches

s1101 - Cerebral Cortex (specific locations affected by approach)

s140 - Sympathetic/Parasympathetic Nervous System

• Autonomic dysfunction - blood pressure instability, temperature dysregulation (relevant in hypothalamic or brainstem involvement)

s220 - Eyeball Structure (via cranial nerve involvement)

• Optic nerve or chiasm injury causing visual field defects

s730 - Scalp/Skull Integrity

• Bone flap resorption (aseptic or avascular necrosis of the flap)
• Wound dehiscence, surgical site infection, meningitis
• Cranial defect prior to cranioplasty causing "syndrome of the trephined" (neurological deterioration from the skull defect itself)

2. Body Functions Impairment (ICF)

b1 - Mental Functions

• Altered consciousness postoperatively - from anesthesia, edema, or hemorrhage
• Prolonged disorders of consciousness in severe cases

• Confusion, disorientation to time, place, person

• Generalized cognitive decline, especially after extensive resections or bilateral involvement

• Reduced sustained, selective, or divided attention (30% of brain tumor/post-craniotomy patients)
• Especially affected with frontal lobe approaches

• Verbal memory impairment (dominant temporal lobe surgery)
• Visual memory impairment (non-dominant temporal surgery)
• Working memory deficits (prefrontal involvement)
• Short-term memory loss is among the most common post-craniotomy cognitive complaints

• Impaired reasoning, problem-solving, concept formation
• "Frontal lobe syndrome" - disinhibition, impulsivity, or apathy

• Planning, goal-setting, cognitive flexibility impairments
• Affects 8% of patients as the primary domain

• Expressive aphasia (Broca's) - non-fluent speech, word-finding difficulties (left frontal/inferior opercula)
• Receptive aphasia (Wernicke's) - difficulty understanding speech (left temporal)
• Anomia - most common; word-finding problems
• Dysgraphia, dyslexia from parietal involvement

• Altered body schema, neglect phenomena (non-dominant parietal)

b2 - Sensory Functions and Pain

• Homonymous hemianopia (temporal/occipital approaches affecting optic radiations)
• Quadrantanopia (Meyer's loop injury in temporal craniotomy)
• Diplopia (oculomotor nerve damage)
• Papilledema from raised ICP

• Sensorineural hearing loss (suboccipital/translabyrinthine approaches, acoustic neuroma surgery)
• Tinnitus, vestibular dysfunction

• Dizziness, vertigo (posterior fossa surgery, VIII nerve involvement)
• Nystagmus, oscillopsia

• Anosmia/hyposmia (anterior cranial fossa approaches, cribriform plate manipulation)
• Taste loss from chorda tympani/VII nerve damage

• Post-craniotomy headache - acute (ICP fluctuation, meningeal irritation) and chronic
• Chronic post-surgical pain (nerve entrapment in scalp closure)
• Post-craniotomy pain affects up to 60% of patients acutely

b3 - Voice and Speech Functions

• Dysarthria - cerebellar (ataxic), pseudobulbar (spastic), or lower motor neuron (flaccid, from posterior fossa)
• Dysphagia - swallowing difficulty from IX, X, XII cranial nerve involvement (posterior fossa craniotomy)
• Dysphonia - voice quality changes (vagal involvement)
• Mutism - transient cerebellar mutism (particularly in children after posterior fossa surgery)

b4 - Cardiovascular, Haematological, Immunological and Respiratory

• Neurogenic cardiac arrhythmias from autonomic dysregulation
• Cardiac instability from brainstem manipulation

• Central apnea, irregular respiratory patterns (brainstem involvement)
• Aspiration risk from dysphagia

• Reduced endurance due to prolonged immobility, critical illness, steroid myopathy

b5 - Functions of the Digestive System

• Post-operative nausea/vomiting (PONV) - particularly from posterior fossa procedures, opioid analgesia

• Pituitary/hypothalamic dysfunction after suprasellar surgery - diabetes insipidus (DI), SIADH, panhypopituitarism, adrenal insufficiency

b6 - Genitourinary and Reproductive

• Neurogenic bladder (frontal lobe lesions) - urinary urgency/incontinence
• Urinary retention from altered consciousness/immobility

• Dysfunction from hypothalamic/limbic injury, medications, psychological factors

b7 - Neuromusculoskeletal and Movement-Related Functions

• Joint stiffness from immobility, heterotopic ossification (prolonged ICU stay)

• Contralateral hemiparesis/hemiplegia - motor cortex or corticospinal tract injury
• Monoparesis - depending on focal cortical involvement
• Proximal weakness from steroid-induced myopathy
• Fatigability

• Spasticity - upper motor neuron injury (corticospinal tract)
• Hypotonia - cerebellar injury
• Rigidity - basal ganglia involvement

• Hyperreflexia, Babinski sign (pyramidal tract injury)
• Absent/diminished deep tendon reflexes (LMN component or cerebellar)

• Ataxia - limb and gait (cerebellar or cerebellar peduncle damage)
• Tremor - intention tremor (cerebellum), resting tremor (basal ganglia)
• Dysdiadochokinesia (cerebellar)
• Apraxia - loss of learned, purposeful movement (parietal/frontal)

• Hemiparetic gait, ataxic gait, steppage gait (foot drop from peroneal palsy via positioning)
• Falls risk

b8 - Functions of the Skin

• Scalp wound healing impairment (from steroids, radiotherapy, or infection)
• Pressure sores from immobility

3. Activity Limitations and Participation Restrictions (ICF d-codes)

4. Summary Table: ICF Codes for Craniotomy

Clinical Note

1. Surgical location (frontal, temporal, parietal, occipital, posterior fossa)
2. Dominant vs. non-dominant hemisphere involvement
3. Underlying pathology (tumor, aneurysm, trauma, epilepsy)
4. Surgical complications (hemorrhage, infection, venous infarction)
5. Adjuvant treatments (radiation, chemotherapy add to cognitive and fatigue burden)