Neurological Concerns

Core Concepts

The neurological assessment

The neurologic exam is the nurse's window into the brain:

• Level of consciousness (LOC) — the single most sensitive indicator of brain function. Screened with AVPU (Alert, Voice, Pain, Unresponsive) and measured in detail with the Glasgow Coma Scale (GCS) — eye opening, verbal response, and motor response, scored 3 (deeply unresponsive) to 15 (fully alert). Document the component scores, not just the total — the motor score carries the most localizing information.
• Pupils — size, equality, and reaction to light; a newly dilated or sluggish pupil with a declining LOC warns of rising pressure in the skull.
• Motor function — strength and symmetry of all four limbs; new one-sided weakness or a drifting arm (pronator drift) is a red flag for stroke.
• Speech and cranial nerves — screening as indicated: language, facial symmetry, swallowing.

Frequency is ordered per protocol — commonly every 1 to 2 hours, more often in acute decline. The rules that make it work: assess the same things the same way each time, compare to baseline, and report any change immediately — a trend of small declines is a bigger warning than any single finding.

Altered level of consciousness and its causes

A falling LOC means the brain is not getting what it needs or is being directly injured. Causes are many and overlapping — trauma, stroke, hypoxia, hypoglycemia and other metabolic derangements, drugs and alcohol, infection, seizures, and increased intracranial pressure. The clinical approach matters more than memorizing lists: ABC first (a falling LOC puts the airway at risk), a bedside glucose check (hypoglycemia is common, dangerous, and rapidly reversible), and protecting the patient — airway-safe positioning, aspiration and seizure precautions, and frequent reassessment while the cause is investigated.

Stroke: ischemic and hemorrhagic

A stroke is an interruption of blood flow to brain tissue. Ischemic stroke — a vessel is blocked (by a clot or plaque) and downstream tissue is starved of oxygen. Hemorrhagic stroke — a vessel ruptures, and blood injures the tissue and occupies space inside the fixed skull, raising pressure.

Both are emergencies, and the first step is recognition. Public-awareness screening uses the FAST approach — Face drooping, Arm weakness, Speech difficulty, Time to call for help — and critical-care nurses use structured assessments to detect new deficits. Time is brain: treatments are time-critical and facility-dependent, so rapid recognition and activation of the stroke response are nursing priorities.

Increased intracranial pressure (ICP)

The skull is a fixed box containing brain tissue, blood, and cerebrospinal fluid. The Monro-Kellie doctrine states that if one grows, something else must shrink — when the brain swells (from injury, bleeding, tumor, or fluid) or blood collects, the box cannot stretch and pressure rises. Rising pressure first squeezes veins, then arteries, starving the brain, and can eventually push brain tissue through the skull's openings — herniation — which is life-threatening.

Classic signs (with individual variation): worsening headache, vomiting, declining level of consciousness, pupil changes, and, late in the course, the Cushing triad — rising blood pressure, slowing heart rate, and abnormal respirations. Nursing care is built around reducing pressure and its triggers:

• Head of the bed elevated and the head kept midline to promote venous drainage.
• Avoiding noxious stimuli and clustering care so the patient gets rest periods; avoiding Valsalva maneuvers (straining, coughing).
• Seizure and aspiration precautions, with frequent scheduled neuro checks and immediate reporting of any change.

In some facilities, pressure is measured directly with an invasive monitor; positioning, monitoring, and treatment practices follow institutional protocols and orders.

Seizures in the critically ill

A seizure is a burst of abnormal electrical activity in the brain. Generalized tonic-clonic seizures involve the whole body: the person loses consciousness, stiffens, and convulses. Status epilepticus — a seizure that does not stop, or repeated seizures without recovery — is a medical emergency that can injure the brain. Critical illness creates seizure risk: metabolic derangements, hypoxia, drug withdrawal, infection, and head injury.

Nursing care during a seizure: stay with the person, protect the head, remove nearby hazards, loosen tight clothing, and time the seizure. The nurse does not hold the person down, put anything in the mouth, or try to stop the movements. Afterward, note onset, body parts, and duration; turn the person to the side if possible to protect the airway; and report — a first seizure or a change in pattern is always significant. Person-first language applies: a person who had a seizure, not "a seizure."

Delirium in the ICU

Delirium is an acute, fluctuating disturbance of consciousness and attention — the person is confused, may be agitated or withdrawn, and the confusion comes and goes. It is extremely common in critically ill patients and is not "just confusion": it is associated with longer stays and worse outcomes. Risk factors cluster around everything the ICU does: illness severity, sedation, sleep deprivation, immobilization, and sensory overload.

Nursing interventions are practical and powerful: frequent reorientation (clock, calendar, familiar voices), protecting sleep at night, early mobility as soon as it is safe, returning glasses and hearing aids, and involving family. Sedation is minimized and screening tools (such as CAM-ICU) are used per facility protocol; medications, when needed, are provider-directed.

Brain death determination (concept)

When catastrophic injury destroys all function of the brain, death can be declared by neurological criteria — "brain death." This is not a treatment decision but a diagnosis of death. The determination is a formal process performed by qualified clinicians: the cause of the coma must be known, brainstem reflexes must be absent, and testing (including an apnea test) must be done under strict legal and institutional criteria that vary by jurisdiction.

The nurse's role is profound and practical: support the family through one of the hardest moments in medicine and communicate clearly that this determination is a diagnosis, not a choice to withdraw care. Families need plain language, time, and compassion — and sometimes a nurse who simply sits with them.

Common Confusions