Picking up exactly where first-hours neurologic resuscitation stopped, the patient has now reached the neuro-ICU with the fracture characterized, decompression and stabilization completed or planned, ventilation and circulation provisionally supported, and an individualized spinal-cord perfusion strategy underway. The dominant problem now changes. The cord injury is no longer only a motor and sensory lesion; it is a disconnection syndrome affecting respiratory mechanics, sympathetic control, venous flow, gastrointestinal motility, bladder emptying, skin integrity, and the ability to mobilize. Recent acute-care recommendations emphasize that preventing these secondary systemic complications is part of neurologic treatment, because hypoxemia, hypotension, infection, pulmonary embolism, pressure injury, and prolonged immobility can erase whatever recovery potential survived the original trauma.

This distinction matters whenever hypotension recurs. Warm extremities and bradycardia support neurogenic physiology, but they do not exclude hemorrhage, tension physiology, myocardial injury, sepsis, medication effect, or occult hypovolemia. Neurogenic shock should therefore remain a diagnosis made within a trauma differential, not a reflex explanation for every low blood pressure in a patient with tetraplegia. Bedside echocardiography, examination for ongoing blood loss, lactate trajectory, urine output, fluid responsiveness, ventilator pressures, and medication review remain necessary. Once euvolemia has been approached, repeated crystalloid boluses for persistent vasoplegia usually exchange hypotension for pulmonary edema, bowel edema, and worse secretion clearance. Norepinephrine remains physiologically attractive when both vascular tone and chronotropy are deficient, but persistent pressor dependence should repeatedly prompt the question of whether the cord injury still explains the entire phenotype.

The most important delayed threat after cervical SCI is often respiratory deterioration. The diaphragm is supplied predominantly through the phrenic nerves arising from C3 through C5, but preserved phrenic output is only one component of ventilation. The intercostal muscles stabilize and expand the chest wall, the abdominal muscles generate forced expiration and cough, and intact bulbar function protects the airway. A patient with a C5 lesion may therefore breathe quietly while awake yet be unable to take a deep breath, clear mucus, tolerate sleep, or compensate for pneumonia. A high thoracic lesion can preserve normal-appearing inspiration while nearly abolishing an effective cough. Respiratory failure is often the combined result of inspiratory weakness, expiratory paralysis, abnormal chest-wall mechanics, bronchial hypersecretion, atelectasis, aspiration, and fatigue rather than a single failed muscle.

The trajectory can worsen over the first several days as cord edema evolves, secretions accumulate, pain limits expansion, and previously recruited accessory muscles fatigue. A reassuring initial saturation is not enough. Serial vital capacity, inspiratory pressure, respiratory rate, tidal-volume pattern, cough strength, secretion burden, gas exchange, and chest imaging are more useful than any isolated threshold. These measurements are position dependent: in tetraplegia, vital capacity may paradoxically be better supine because the abdominal contents support the flaccid diaphragm, whereas sitting allows the abdominal contents to fall forward and flattens the diaphragm. An abdominal binder may therefore improve upright mechanics in selected patients. Conversely, supine positioning increases aspiration risk and may worsen oxygenation from atelectasis, so the best position remains a physiologic compromise rather than a rule.

The attending-level decision is whether the patient is maintaining ventilation with reserve. Falling vital capacity, increasingly shallow breathing, inability to count or speak without pauses, weak cough, progressive hypercapnia, recurrent desaturation, lobar collapse, or rapidly increasing suction requirements should move the team toward controlled intubation before a secretion crisis becomes a hypoxemic arrest. A single satisfactory negative inspiratory force does not protect against extubation failure if the patient cannot clear secretions. Diaphragm ultrasound and fluoroscopic or electrophysiologic testing can help in selected cases, but they should supplement rather than replace serial bedside physiology.

Airway clearance must be scheduled rather than ordered “as needed.” Humidification, appropriately performed suctioning, manually assisted cough, mechanical insufflation–exsufflation, lung-volume recruitment, chest physiotherapy, postural drainage, and—in selected centers—intrapulmonary percussive ventilation address different components of the problem. Bronchoscopy is appropriate for suspected mucus plugging, lobar collapse, airway obstruction, or diagnostic uncertainty, but repeated bronchoscopies should not substitute for an effective daily secretion strategy. Anticholinergic drugs may reduce vagally mediated bronchoconstriction or troublesome secretions, yet excessive drying can make mucus more tenacious. The treatment must therefore be judged by clearance, not simply by the amount of visible secretion.

Liberation from ventilation should similarly be treated as a longitudinal process. The patient must demonstrate adequate spontaneous ventilation, manageable secretions, an effective spontaneous or assisted cough, airway protection, and stable gas exchange. Cervical surgery, edema, a rigid collar, prolonged intubation, and the injury itself all increase dysphagia and aspiration risk, so swallowing assessment should precede oral intake when clinically indicated. A passed spontaneous-breathing trial does not by itself establish extubation readiness. Conversely, a low vital capacity does not automatically prove permanent ventilator dependence if cough assistance, noninvasive support, and respiratory rehabilitation can bridge recovery.

When prolonged ventilation is likely, tracheostomy should be discussed as a respiratory-management decision rather than a statement about neurologic prognosis. Complete high cervical injury, persistent diaphragmatic dysfunction, repeated extubation failure, copious secretions, pneumonia, and associated chest or bulbar injury increase its likelihood. A 2022 systematic review found that earlier tracheostomy was associated with shorter mechanical-ventilation duration and ICU and hospital stays, and possibly less ventilator-associated pneumonia, but the evidence was predominantly observational and did not establish a mortality benefit or one universally optimal day. The practical question is whether continued translaryngeal intubation still offers a realistic near-term path to liberation. Anterior cervical fixation is not an absolute prohibition against tracheostomy, although operative approach, wound anatomy, and timing must be coordinated with the spine and airway teams. (Foran et al., 2022)

Respiratory care also intersects directly with cardiac risk. Cardiac sympathetic fibers arise largely from T1 through T5, whereas vagal input reaches the heart outside the cord. A high cervical lesion therefore removes sympathetic acceleration while preserving vagal braking. Sinus bradycardia is common, particularly with motor-complete cervical injuries, and the imbalance is often most pronounced during the first week before gradually improving over several weeks. Hypoxemia, endotracheal suctioning, laryngoscopy, coughing, turning, and defecation can provoke abrupt bradycardia, sinus pauses, or asystole. The event should not be dismissed as “expected SCI physiology,” because the same patient may also have hypoxia, myocardial contusion, electrolyte disturbance, medication toxicity, or pulmonary embolism.

High-risk patients require continuous telemetry, reliable oxygenation, and explicit preparation before known vagal stimuli. Suctioning should be necessary, preoxygenated, and no deeper or longer than required. Atropine should be immediately available, and selected patients with reproducible episodes may benefit from preprocedural atropine or glycopyrrolate. Recurrent symptomatic pauses or asystole despite correction of hypoxemia and other reversible triggers warrants early electrophysiology involvement and consideration of temporary pacing; permanent pacing is reserved for persistent or recurrent clinically important bradyarrhythmia rather than uncomplicated sinus bradycardia. Methylxanthines and enteral beta-agonists have been reported as adjuncts, but their evidence is largely limited to case reports and small series. They should not delay pacing when the rhythm is immediately dangerous. (Hector et al., 2013)

As vasopressors are reduced and mobilization begins, the same sympathetic disconnection appears as orthostatic hypotension. Venous pooling below the lesion, low plasma volume, impaired skeletal-muscle pumping, and absent reflex vasoconstriction can produce dramatic pressure drops without compensatory tachycardia. Gradual head elevation, compression garments, abdominal binding, carefully maintained volume status, and progressive tilt or mobilization are first-line measures. Midodrine or another pressor agent can be considered when nonpharmacologic measures are insufficient, but the objective is functional tolerance rather than normalization of every upright pressure.

Autonomic dysreflexia is the opposite pressure phenotype and must not be mislabeled as recurrent neurogenic shock. It most often occurs with lesions at or above T6 after spinal reflex activity begins returning, but it can appear during the acute hospitalization and can coexist with otherwise depressed reflexes. A noxious stimulus below the lesion generates an unmodulated sympathetic discharge, producing an abrupt blood-pressure increase—often more than 20 mm Hg above a characteristically low baseline—with headache, flushing and sweating above the lesion, piloerection, nasal congestion, anxiety, and either reflex bradycardia or tachycardia. Bladder distention or a kinked catheter is the most common trigger; fecal impaction, pressure injury, fracture, surgical pain, urinary infection, and restrictive devices are other frequent causes.

Treatment begins by confirming the pressure, elevating the head when spinal and hemodynamic conditions permit, loosening constrictive devices, and searching immediately for the trigger—bladder first, then bowel and skin. Blood pressure should be checked every few minutes. If severe hypertension persists, particularly with systolic pressure at or above approximately 150 mm Hg, a rapid-onset, short-duration antihypertensive should be used while trigger removal continues. Long-acting treatment is hazardous because pressure may collapse when the stimulus is relieved. Digital rectal manipulation itself can intensify dysreflexia and should be approached with appropriate topical anesthesia, monitoring, and blood-pressure control. These recommendations are based substantially on expert consensus and lower-level evidence, but failure to recognize the syndrome risks intracranial hemorrhage, seizure, myocardial ischemia, pulmonary edema, and death. (Krassioukov et al., 2021)

Temperature regulation is impaired for the same reason. Patients with high lesions lose vasomotor control and sweating over a large body surface and become partially poikilothermic. They may drift toward environmental hypothermia or develop disproportionate hyperthermia because they cannot dissipate heat. Nevertheless, “neurogenic fever” is a diagnosis of exclusion. Pneumonia, urinary infection, surgical-site infection, bacteremia, venous thromboembolism, drug fever, transfusion reaction, and occult abdominal disease are common enough that unexplained fever requires a real investigation. When no source is found and central thermoregulatory failure is suspected, environmental control and surface or intravascular cooling may be necessary because antipyretics cannot restore absent sweating and vasodilation.

Venous thromboembolism prevention cannot wait for rehabilitation. SCI combines profound venous stasis, trauma-associated hypercoagulability, endothelial injury, immobility, and often surgery or long-bone fracture. Mechanical prophylaxis should begin promptly when limb injuries permit, but it is not adequate long-term protection by itself. The 2017 acute-SCI guideline suggests routine anticoagulant prophylaxis with low-molecular-weight heparin or fixed low-dose unfractionated heparin and initiation within 72 hours of injury when feasible; adjusted-dose unfractionated heparin was discouraged because of bleeding risk. The SCI-specific Consortium guideline generally favors low-molecular-weight heparin once active bleeding has been excluded and recommends prophylaxis for at least eight weeks after injury in patients with limited mobility, with longer duration individualized for motor-complete injury, fractures, previous VTE, cancer, obesity, and other risks. These are weak recommendations supported by low-quality evidence, but the untreated risk is substantial. Timing around decompression, epidural or intraspinal devices, and evolving hemorrhage must be coordinated explicitly rather than allowing prophylaxis to be omitted indefinitely. Prophylactic inferior vena cava filters are not a substitute and are not recommended routinely. (Fehlings et al., 2017; Consortium for Spinal Cord Medicine, 2016)

The gastrointestinal tract initially behaves as though it is also in spinal shock. Gastric emptying and colonic motility decline, while trauma, opioids, electrolyte abnormalities, immobility, and vasopressors add further inhibition. Abdominal distention is not merely uncomfortable: it elevates the diaphragm, worsens ventilation, increases aspiration risk, and may provoke autonomic dysreflexia. Ileus should prompt correction of potassium and magnesium, reduction of unnecessary opioids and anticholinergics, decompression when clinically required, and evaluation for mechanical obstruction or intra-abdominal injury rather than automatic escalation of laxatives. Enteral nutrition should begin when the patient is hemodynamically stable and the gastrointestinal tract is usable.

A bowel program should then be established early and revised as spinal-shock physiology evolves. Reflexic and areflexic bowel patterns require different combinations of stool consistency management, oral agents, suppositories, digital stimulation, or manual evacuation; neurologic level alone does not perfectly predict the functional phenotype. The immediate ICU objective is regular, planned evacuation without impaction, incontinence, excessive straining, or prolonged procedures. A standardized regimen is useful, but the drug and rectal components must be adjusted to stool consistency, feeding, opioid exposure, lesion physiology, and autonomic-dysreflexia risk. The current bowel guideline emphasizes an individualized program rather than a universal checklist. (Johns et al., 2021)

Bladder management follows a similar transition. During acute spinal shock, the bladder is usually acontractile regardless of whether the eventual pattern will be suprasacral detrusor overactivity or sacral areflexia. An indwelling catheter is appropriate during active resuscitation, strict urine-output monitoring, major surgery, and severe hemodynamic instability, but it should not remain by inertia. Once the patient is stable, intermittent catheterization is generally preferred when hand function, staffing, anatomy, fluid intake, and caregiver support permit. Common practical targets are catheterization every four to six hours with volumes kept below approximately 500 mL, adjusted to intake and bladder capacity, to avoid overdistention and dysreflexia.

Skin preservation begins on admission, not after the patient reaches rehabilitation. Sensory loss removes protective discomfort, motor paralysis prevents spontaneous repositioning, autonomic injury alters tissue perfusion, and vasopressors, hypoxemia, edema, moisture, malnutrition, and anemia further reduce tolerance to pressure and shear. Every turn should include inspection of the occiput, chin and collar interfaces, scapulae, elbows, sacrum, trochanters, heels, and device contact points. A pressure-redistributing surface, heel off-loading, moisture control, correctly fitted cervical orthosis, and scheduled repositioning with spinal alignment are essential. Spinal precautions do not mean immobility; they mean controlled movement. A rigid transport board should be removed as soon as safely possible, and surgical fixation does not exempt the patient from turning. Pressure injury can delay mobilization and rehabilitation for weeks, turning a preventable complication into a major determinant of outcome. (Vecin & Gater, 2022)

Rehabilitation therefore begins in the ICU, although intensive rehabilitation begins only when the patient is medically stable enough to tolerate it. Early physiatry involvement, positioning, passive and active-assisted range of motion, hand and ankle splinting, respiratory-muscle and cough training, communication support, swallowing therapy, gradual upright tolerance, and preservation of shoulder mechanics are not cosmetic additions to critical care. They prevent contractures, atelectasis, pressure injury, deconditioning, and upper-limb overuse while establishing the functional baseline from which recovery will be measured. The 2017 rehabilitation guideline recommends offering rehabilitation once medical stability and tolerance are achieved, but explicitly acknowledges that this timing recommendation rests on expert opinion rather than comparative trials. Early activity should therefore not be advertised as proven neuroregeneration; its immediate evidence-based value is the prevention of avoidable secondary disability. (Fehlings et al., 2017)

Throughout this course, the neurologic examination remains dynamic. Sedation, pain, edema, spinal shock, peripheral nerve injury, fractures, and critical illness can all change apparent strength or reflexes. Serial ISNCSCI examinations should document sacral sensation and voluntary anal contraction rather than relying on casual limb testing. Any new motor or sensory loss, ascending level, unexplained respiratory deterioration, or change after surgery demands reassessment for residual compression, epidural hematoma, hardware or alignment problems, cord edema, vascular injury, or another surgically actionable process. “The patient has a complete injury” is not an acceptable reason to ignore neurologic worsening unless completeness has been established correctly and the new change truly has no management consequence.

The neuro-ICU endpoint is therefore not simply survival through a seven-day blood-pressure protocol. It is a patient whose lungs remain recruited and clearable, whose airway plan matches the expected recovery trajectory, whose bradyarrhythmias and dysautonomia are anticipated rather than discovered during arrest, whose VTE prophylaxis is active, whose bowel and bladder are managed without overdistention or impaction, whose skin and joints remain intact, and whose neurologic examinations are reliable enough to support the next phase of decision-making. The next installment will address neurologic recovery and prognostication after traumatic SCI: how serial ISNCSCI findings, sacral sparing, AIS conversion, MRI lesion features, injury level, age, and time modify probability—and what still cannot be responsibly predicted during the first days.

References

• Aude, C. A., Dishong, D. M., Menta, A., Jo, J., Khalifeh, J., Hughes, L., Azad, T. D., Burnett, A. L., & Theodore, N. (2025). Catheterization method and functional recovery of neurogenic bladder in spinal cord injury. JAMA Network Open, 8(7), e2522030. https://doi.org/10.1001/jamanetworkopen.2025.22030
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• Berney, S., Bragge, P., Granger, C., Opdam, H., & Denehy, L. (2011). The acute respiratory management of cervical spinal cord injury in the first 6 weeks after injury: A systematic review. Spinal Cord, 49(1), 17–29. https://doi.org/10.1038/sc.2010.39
• Consortium for Spinal Cord Medicine. (2006). Bladder management for adults with spinal cord injury: A clinical practice guideline for health-care providers. The Journal of Spinal Cord Medicine, 29(5), 527–573. https://doi.org/10.1080/10790268.2006.11753901
• Consortium for Spinal Cord Medicine. (2016). Prevention of venous thromboembolism in individuals with spinal cord injury: Clinical practice guidelines for health care providers (3rd ed.). Topics in Spinal Cord Injury Rehabilitation, 22(3), 209–240. https://doi.org/10.1310/sci2203-209
• Fehlings, M. G., Tetreault, L. A., Aarabi, B., Anderson, P., Arnold, P. M., Brodke, D. S., Chiba, K., Dettori, J. R., Furlan, J. C., Harrop, J. S., Hawryluk, G., Holly, L. T., Howley, S., Jeji, T., Kalsi-Ryan, S., Kotter, M. R. N., Kurpad, S., Kwon, B. K., Marino, R. J., … Burns, A. S. (2017). A clinical practice guideline for the management of patients with acute spinal cord injury: Recommendations on the type and timing of rehabilitation. Global Spine Journal, 7(3_suppl), 231S–238S. https://doi.org/10.1177/2192568217701910
• Fehlings, M. G., Tetreault, L. A., Aarabi, B., Anderson, P., Arnold, P. M., Brodke, D. S., Burns, A. S., Chiba, K., Dettori, J. R., Furlan, J. C., Hawryluk, G., Holly, L. T., Howley, S., Jeji, T., Kalsi-Ryan, S., Kotter, M. R. N., Kurpad, S., Kwon, B. K., Marino, R. J., … Harrop, J. S. (2017). A clinical practice guideline for the management of patients with acute spinal cord injury: Recommendations on the type and timing of anticoagulant thromboprophylaxis. Global Spine Journal, 7(3_suppl), 212S–220S. https://doi.org/10.1177/2192568217702107
• Foran, S. J., Taran, S., Singh, J. M., Kutsogiannis, D. J., & McCredie, V. (2022). Timing of tracheostomy in acute traumatic spinal cord injury: A systematic review and meta-analysis. Journal of Trauma and Acute Care Surgery, 92(1), 223–231. https://doi.org/10.1097/TA.0000000000003394
• Hatton, G. E., Mollett, P. J., Du, R. E., Wei, S., Korupolu, R., Wade, C. E., Adams, S. D., & Kao, L. S. (2021). High tidal volume ventilation is associated with ventilator-associated pneumonia in acute cervical spinal cord injury. The Journal of Spinal Cord Medicine, 44(5), 775–781. https://doi.org/10.1080/10790268.2020.1722936
• Hector, S. M., Biering-Sørensen, T., Krassioukov, A., & Biering-Sørensen, F. (2013). Cardiac arrhythmias associated with spinal cord injury. The Journal of Spinal Cord Medicine, 36(6), 591–599. https://doi.org/10.1179/2045772313Y.0000000114
• Johns, J., Krogh, K., Rodriguez, G. M., Eng, J., Haller, E., Heinen, M., Laredo, R., Longo, W., Montero-Colon, W., & Korsten, M. (2021). Management of neurogenic bowel dysfunction in adults after spinal cord injury: Clinical practice guideline for healthcare providers. The Journal of Spinal Cord Medicine, 44(3), 442–510. https://doi.org/10.1080/10790268.2021.1883385
• Krassioukov, A., Linsenmeyer, T. A., Beck, L. A., Elliott, S., Gorman, P., Kirshblum, S., Vogel, L., Wecht, J., & Clay, S. (2021). Evaluation and management of autonomic dysreflexia and other autonomic dysfunctions: Preventing the highs and lows—Management of blood pressure, sweating, and temperature dysfunction. Topics in Spinal Cord Injury Rehabilitation, 27(2), 225–290. https://doi.org/10.46292/sci2702-225
• Krueckel, J., Kerschbaum, M., Alt, V., & Lang, S. (2025). Clinical recommendations for the acute care of patients with traumatic spinal cord injury. Deutsches Ärzteblatt International, 122(22), 611–616. https://doi.org/10.3238/arztebl.m2025.0148
• Meregildo-Rodríguez, E. D., Vásquez-Tirado, G. A., Quispe-Castañeda, C. V., Cuadra-Campos, M. del C., Contreras-Cabrera, J. M., & Pinedo-Portilla, J. L. (2024). High vs. low tidal volume and pulmonary complications in patients with cervical spinal cord injury on mechanical ventilation: Systematic review. Frontiers in Medicine, 11, 1362318. https://doi.org/10.3389/fmed.2024.1362318
• Vecin, N. M., & Gater, D. R. (2022). Pressure injuries and management after spinal cord injury. Journal of Personalized Medicine, 12(7), 1130. https://doi.org/10.3390/jpm12071130
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