NLE Neurosensory Nursing — Spinal Cord and Peripheral Nerve DisordersSummary

Spinal cord injury results from traumatic damage (vehicular accidents, falls, diving, interpersonal violence) that compresses, contuses, lacerates, or transects the cord. The anatomical level determines the extent of neurologic deficit: cervical injuries (C1–C8) cause tetraplegia (quadriplegia)—impairment of all four limbs and trunk; thoracic injuries (T1–T12) cause paraplegia—impairment of the lower limbs and trunk; lumbar and sacral injuries cause lower limb weakness or loss. Critically, injuries above C4 damage the phrenic nerve (C3–C5), impairing the diaphragm and mandating ventilatory support. The mnemonic 'C3, 4, 5 keep the diaphragm alive' emphasizes this life-threatening threshold.

A complete spinal cord injury causes total loss of motor and sensory function below the level of injury, with permanent neurologic deficit below that point. An incomplete injury preserves some motor or sensory function below the level, offering potential for greater functional recovery with rehabilitation. Incomplete injuries have a better prognosis for rehabilitation and functional independence.

Central cord syndrome causes disproportionately greater motor weakness in the upper extremities compared to the lower extremities, with relatively preserved lower limb strength. It is the most common incomplete syndrome and typically results from hyperextension injuries in older adults with pre-existing cervical spondylosis. Anterior cord syndrome results in loss of motor function and pain/temperature sensation below the injury level, with preserved proprioception and vibration sense (posterior columns intact). Brown-Séquard syndrome (hemicord transection) causes ipsilateral (same-side) motor loss and loss of proprioception below the injury, with contralateral (opposite-side) loss of pain and temperature sensation due to crossing of spinothalamic tracts. Each syndrome has a distinct prognosis and functional outcome.

The initial traumatic impact is compounded by secondary injury mechanisms occurring within hours: edema, hemorrhage, ischemia, excitotoxicity (glutamate release), and inflammatory cascade damage the cord beyond the primary lesion. Early management aims to minimize secondary injury by maintaining spinal immobilization with a cervical collar and backboard; using log-rolling technique (turning the patient as one rigid unit) to keep the spine in neutral alignment; ensuring airway patency without cervical hyperextension (jaw-thrust maneuver); maintaining hemodynamic stability and adequate mean arterial pressure to perfuse the cord; and considering high-dose corticosteroids (though now controversial and not routinely recommended). Surgical decompression and stabilization may be indicated depending on imaging findings and neurologic status.

Spinal shock is a temporary neurologic phenomenon occurring immediately after acute spinal cord injury, characterized by complete loss of all reflexes, motor function, sensation, and autonomic function below the level of injury. Patients present with flaccid paralysis (not spastic), absent or diminished reflexes (including the bulbocavernosus reflex), anesthesia, and loss of bowel/bladder tone. Spinal shock resolves over days to weeks (variable timeline) as reflex arcs below the injury begin to function again, often replaced by spasticity and hyperreflexia. It is purely a neurologic phenomenon reflecting the sudden disruption of descending pathways that normally inhibit spinal reflexes.

Neurogenic shock is a hemodynamic (circulatory) emergency distinct from spinal shock, occurring with spinal cord injuries at or above the T6 level. Loss of sympathetic tone from interruption of descending sympathetic pathways results in unopposed parasympathetic activity and vasodilation. The classic triad is: (1) hypotension (systolic often <90 mmHg), (2) bradycardia (reflex from baroreceptor response to the hypotension—pulse may be 40–50 bpm), and (3) warm, dry skin from peripheral vasodilation and inability to vasoconstrict. This profile is opposite to hypovolemic (hemorrhagic) shock, which presents with tachycardia and cold, clammy skin. Management includes cautious IV fluid resuscitation (risk of pulmonary edema if aggressive), vasopressors (dopamine, norepinephrine) to restore vascular tone, and atropine for symptomatic bradycardia. Spinal cord perfusion pressure must be maintained (target mean arterial pressure ≥85 mmHg).

Autonomic dysreflexia is an exaggerated, uncontrolled sympathetic response occurring in patients with spinal cord injury at or above T6 (typically after the acute phase once spinal shock has resolved and reflexes have returned). A noxious stimulus below the level of injury triggers massive sympathetic activation that the brain cannot regulate or downregulate because sensory signals cannot cross the lesion. The presentation includes: (1) sudden, severe, pounding headache (often the first warning sign); (2) severe, dangerous hypertension (systolic often >200 mmHg, risking stroke, myocardial infarction, seizure, death); (3) bradycardia (compensatory baroreceptor reflex); (4) profuse diaphoresis and flushing above the level of injury; (5) pallor and coolness below the level of injury; (6) nasal congestion, blurred vision, chest/back pain, and acute anxiety. The most common triggers are visceral distension: a distended or obstructed urinary bladder (kinked/blocked catheter, urinary retention) is the #1 cause, followed by fecal impaction/constipation, and skin stimuli (pressure injuries, tight clothing, ingrown toenails, urinary tract infection). Management demands a specific priority sequence: (1) immediately elevate the head of the bed or sit the patient upright (orthostatic effect lowers BP acutely); (2) loosen all tight or constrictive clothing and devices; (3) locate and remove the trigger (check the bladder/catheter first for kinks/blockage, catheterize if needed; then check for and disimpact fecally using anesthetic lubricant); (4) monitor blood pressure frequently; (5) if BP remains dangerously elevated after trigger removal, give a rapid-acting antihypertensive (nifedipine sublingual, nitrate spray/paste). Prevention is paramount: maintain a bowel program, keep the bladder draining freely, prevent pressure injuries, and educate patient and caregivers on recognition and emergency response.

Acute and ongoing nursing care targets prevention of secondary injury and the cascade of immobility complications: (1) Respiratory care for high cervical injuries—monitor ventilation, use incentive spirometry, assist with coughing (high injuries lose abdominal muscles); (2) Skin integrity—frequent repositioning (every 2 hours), pressure relief, skin inspection, moisture management, and prevention of pressure injuries (Stage III/IV ulcers are common in SCI patients); (3) Thromboembolism prophylaxis—sequential compression devices, early mobilization when stable, anticoagulation (prophylactic enoxaparin or fondaparinux); (4) Bowel and bladder management—consistent scheduled bowel program (stool softeners, adequate fiber/fluids, regular evacuation times) to prevent impaction (a dysreflexia trigger); intermittent straight catheterization on a schedule (preferred over indwelling catheters due to infection risk and dysreflexia risk from overdistension) with monitoring for bladder compliance and reflux; (5) Range of motion—passive and active ROM to prevent contractures, splinting of extremities; (6) Orthostatic hypotension management—gradual mobilization with compression stockings/abdominal binders, tilt tables; (7) Psychosocial support—adjustment counseling, depression screening, sexual function counseling, vocational rehabilitation planning.

Spinal cord injury disrupts normal voluntary control of the bladder and bowel. The neurogenic bladder can be spastic (reflex) or flaccid, depending on the level: upper motor neuron lesions (above S2–S4 conus) result in a spastic reflex bladder that empties involuntarily when full, risking overdistension, reflux, and infection; lower motor neuron lesions (conus or cauda equina) result in a flaccid bladder that fails to empty and becomes overdistended, requiring manual expression or catheterization. Management focuses on preventing overdistension, infection, and autonomic dysreflexia through intermittent straight catheterization on a scheduled basis (e.g., every 4–6 hours), fluid management, and monitoring residual urine volumes. For bowel management, a consistent program (scheduled evacuation time, stool softeners, adequate fiber and water intake, digital stimulation if needed) prevents impaction, which is a major dysreflexia trigger. Both programs require patient and caregiver education and long-term adherence.

A herniated disc occurs when the soft nucleus pulposus protrudes through the annulus fibrosus and compresses one or more spinal nerve roots, most commonly at L4–L5 or L5–S1 (lumbar herniation, causing sciatica—low back pain radiating into the leg, numbness, tingling, weakness) or in the cervical spine (causing neck and arm pain and weakness). Diagnosis is confirmed by MRI. Most patients improve with conservative management: limited initial rest (not prolonged bed rest), physical therapy, heat/cold application, NSAIDs, muscle relaxants, analgesics, and education on proper body mechanics and activity modification. Cauda equina syndrome is a surgical emergency presenting with bowel and/or bladder dysfunction (urinary retention or incontinence, loss of anal tone), saddle anesthesia (sensory loss in the perianal/perineal area), and bilateral leg weakness or paralysis. This represents massive compression of the cauda equina nerve roots and requires urgent surgical decompression (within 24–48 hours) to prevent permanent neurologic damage and loss of continence. Post-operative care includes strict log-rolling and spinal alignment, neurovascular checks of the lower limbs, monitoring for CSF leak, and after spinal fusion, avoiding twisting, bending, and heavy lifting. Pain management and rehabilitation are ongoing.

Peripheral neuropathy is damage to peripheral nerves causing sensory, motor, and autonomic dysfunction. The most common cause globally and in the Philippines is diabetes mellitus (diabetic peripheral neuropathy), followed by alcohol use disorder, vitamin B12 deficiency, chemotherapy-induced neuropathy, and other metabolic or infectious causes. The classic presentation is a stocking-glove distribution of sensory loss (starting distally in the feet and hands, progressing proximally), with numbness, tingling, burning pain, and progressive loss of protective sensation. Motor involvement causes weakness and diminished reflexes. Autonomic involvement may produce orthostatic hypotension, gastroparesis, and bladder dysfunction. Assessment includes monofilament testing (using a 10-gram monofilament to assess loss of protective sensation—inability to feel the filament indicates significant neuropathy and high risk of foot ulcers), vibration sense testing, tendon reflexes, and electrodiagnostic studies (nerve conduction studies and electromyography) to quantify nerve damage. Blood glucose, HbA1c, and vitamin B12 levels identify underlying causes. The central danger is loss of protective sensation: patients cannot perceive injuries, burns, or pressures, leading to unnoticed wounds, ulcers (particularly in the feet in diabetes), and amputation. Management targets the underlying cause (tight glycemic control in diabetes is essential—HbA1c <7% is the standard goal) and symptom relief. Pharmacotherapy for neuropathic pain includes first-line agents: gabapentin (300–3600 mg/day in divided doses) or pregabalin (150–600 mg/day); second-line options include tricyclic antidepressants (amitriptyline 25–100 mg at bedtime) or serotonin-norepinephrine reuptake inhibitors (duloxetine 60 mg daily); ordinary analgesics and NSAIDs are often ineffective for neuropathic pain.

Comprehensive education is central to long-term outcomes. For SCI, teaching includes: recognition of autonomic dysreflexia symptoms as an emergency and immediate response (elevate head, loosen clothing, find trigger); bowel and bladder program adherence; skin inspection and pressure relief; safe transfer and mobility techniques; prevention of contractures through ROM; management of spasticity; adaptive equipment use; sexual function and fertility counseling; vocational rehabilitation planning; and psychosocial adjustment resources. For peripheral neuropathy (especially diabetic), teaching emphasizes: daily foot inspection using a mirror to visualize all surfaces, including between toes and soles; avoiding going barefoot; wearing well-fitting protective footwear (no high heels, tight shoes, or open-toed sandals); testing water temperature with a thermometer or elbow (not feet) to prevent burns; proper nail care (cut straight across, not too short); maintaining excellent foot hygiene; controlling blood glucose through diet, medications, and monitoring; reporting any redness, swelling, warmth, drainage, or wound promptly to prevent progression to ulceration and amputation. Family involvement is critical for both conditions to ensure long-term adherence and safety.

Common nursing diagnoses for SCI include: Risk for Further Spinal Cord Injury (related to improper handling/movement); Ineffective Breathing Pattern or Impaired Spontaneous Ventilation (for high cervical injuries); Autonomic Dysreflexia or Risk for Autonomic Dysreflexia (related to noxious stimuli below level of injury); Neurogenic Bowel or Constipation (related to loss of voluntary control); Neurogenic Bladder or Urinary Retention (related to loss of voluntary control); Risk for Pressure Injury (related to immobility and sensory loss); Risk for Thromboembolism (related to immobility); Ineffective Coping (related to life-altering injury); Sexual Dysfunction (related to loss of motor/sensory function); Deficient Knowledge (regarding bowel/bladder program, skin care, equipment use). For peripheral neuropathy: Altered Sensory Perception or Neuropathic Pain (related to nerve damage); Risk for Injury (related to loss of protective sensation); Risk for Ineffective Peripheral Tissue Perfusion (related to autonomic dysfunction); Deficient Knowledge (regarding foot care and glycemic control). Each diagnosis guides specific interventions and expected outcomes.