CCRN — Adult Critical Care
CCRN Neurology Practice Questions (ICP, Stroke, Status Epilepticus)
Neurologic critical care on the CCRN centers on protecting an injured brain from secondary injury — the insults (hypoxia, hypotension, abnormal CO2, fever, hypoglycemia, seizures) that a nurse can detect and prevent. The exam tests ICP/CPP management, herniation recognition, the divergent care of ischemic versus hemorrhagic stroke, and the emergencies (status epilepticus) where minutes change outcomes.
This guide reviews the high-yield neuro patterns with practice questions and rationales. Educational review only — pressure targets, osmotherapy agents, and stroke protocols follow your institution's policies and current guidelines; verify before applying.
ICP, CPP, and herniation
The math: cerebral perfusion pressure equals mean arterial pressure minus intracranial pressure (CPP = MAP − ICP). Normal ICP is under ~15 mmHg; injured brains need CPP maintained per target (commonly 60–70 mmHg in adults). The Monro-Kellie doctrine explains the danger: the skull's volume is fixed (brain, blood, CSF), so an expanding mass first displaces CSF and venous blood, then ICP climbs steeply once compensation is exhausted. Nursing care works both sides of the equation — support MAP and lower ICP.
ICP-lowering nursing measures: head of bed elevated ~30° and the head midline (to optimize venous drainage), avoiding neck flexion/tight tube ties and collars, adequate sedation/analgesia (noxious stimuli and agitation spike ICP), normocapnia via controlled ventilation (hyperventilation only as a brief temporizing measure for active herniation — routine hyperventilation causes ischemia), osmotherapy per protocol (hypertonic saline or mannitol), seizure and fever control, and careful clustering of care. Herniation signs: a unilaterally dilated/fixed pupil, Cushing's triad (hypertension, bradycardia, irregular respirations), motor posturing (decorticate progressing to decerebrate), and rapid decline in level of consciousness — recognize and escalate immediately.
Stroke and status epilepticus
Ischemic versus hemorrhagic: the two diverge sharply in blood-pressure management. Acute ischemic stroke (before/without thrombolysis) often tolerates permissive hypertension to perfuse the penumbra, with strict pressure ceilings after thrombolytics and bleeding surveillance; hemorrhagic stroke generally calls for tighter blood-pressure control to limit hematoma expansion and reversal of anticoagulation. Both require rapid recognition (last-known-well time custody, NIH stroke scale), glucose check (hypoglycemia mimics stroke), aspiration precautions/NPO until swallow screened, and neuro checks on an interval. Thrombectomy and thrombolysis windows drive time-critical decisions.
Status epilepticus is a neurologic emergency — prolonged or repeated seizures without recovery cause neuronal injury and systemic complications (hyperthermia, rhabdomyolysis, acidosis, airway compromise). Management is time-driven: protect the airway and oxygenate, benzodiazepines first-line, then a second-line antiepileptic per protocol, identify and treat causes (hypoglycemia, hyponatremia, missed medications, intracranial pathology, eclampsia), and escalate to anesthetic infusions for refractory cases. The nursing throughline across neuro care: detect deterioration early, prevent secondary insults, and act fast when the window is short.
Practice questions with answers & rationales
Q1. A patient has a MAP of 70 and an ICP of 22. Calculate the CPP and state whether it meets a typical target.
Answer: CPP = MAP − ICP = 70 − 22 = 48 mmHg — below the commonly targeted 60–70 mmHg, meaning the injured brain is being underperfused. The interventions work both variables: raise MAP (fluids/vasopressors per protocol) and lower ICP (head up/midline, sedation, normocapnia, osmotherapy, fever/seizure control). The exam expects you to name both levers — fixing only MAP or only ICP is an incomplete answer.
Q2. Why is routine hyperventilation harmful in a patient with elevated ICP?
Answer: Hyperventilation lowers ICP by causing cerebral vasoconstriction — which reduces cerebral blood flow and can cause ischemia of already-vulnerable tissue. So lowering CO2 trades an ICP number for reduced perfusion; guidelines reserve brief hyperventilation as a temporizing bridge during active herniation, not as routine management. The standard is controlled normocapnia (~35–45 mmHg) monitored with capnography, with the herniation exception clearly bounded.
Q3. Your neuro patient develops a fixed dilated left pupil, rising blood pressure, and bradycardia. What is happening and what do you do?
Answer: Herniation with Cushing's response — a true emergency. Optimize the basics immediately (airway/oxygenation, head midline and elevated, ensure venous drainage isn't obstructed, adequate sedation), give osmotherapy per protocol, institute brief hyperventilation to the protocol target now that herniation is active, and notify the provider/neurosurgery emergently for definitive intervention. Recognizing the triad and escalating without delay is the tested priority.
Q4. How does blood-pressure management differ between acute ischemic and hemorrhagic stroke?
Answer: Ischemic stroke (without/before thrombolysis) often permits higher pressures to maintain perfusion to the penumbra, with strict ceilings after thrombolytics and vigilant bleeding monitoring. Hemorrhagic stroke generally requires tighter blood-pressure control to limit hematoma expansion, plus anticoagulation reversal as indicated. The exam tests this divergence directly — applying ischemic permissive-hypertension thinking to a bleed (or vice versa) is the planted error.
Q5. A patient has been seizing for several minutes without regaining consciousness between episodes. What is this and what are the priorities?
Answer: Status epilepticus — a neurologic emergency. Priorities: protect the airway and oxygenate, give first-line benzodiazepines promptly, follow with a second-line antiepileptic per protocol, check glucose and electrolytes (hypoglycemia and hyponatremia are reversible causes), identify other causes (missed meds, intracranial pathology, eclampsia in pregnancy), and escalate to anesthetic infusions if refractory. Time matters — ongoing seizures injure neurons and cause systemic complications.
Q6. Why is glucose checked on every patient with stroke-like symptoms or new altered mentation?
Answer: Hypoglycemia is a common, immediately reversible mimic of stroke and other neurologic catastrophes — treating it can resolve the deficit entirely, and missing it wastes time on the wrong pathway (or delays a true stroke's care). It's a fast, cheap test that changes the differential, which is why 'check glucose' is a near-universal early step in neuro assessment and a frequent CCRN answer.
Q7. What nursing measures optimize cerebral venous drainage and avoid ICP spikes?
Answer: Keep the head of bed elevated around 30°, the head and neck midline (avoid rotation/flexion), ensure cervical collars and endotracheal tube ties aren't compressing neck veins, provide adequate sedation/analgesia to blunt responses to noxious stimuli, cluster care and avoid prolonged stimulation, manage fever and seizures, and minimize Valsalva/coughing where possible. These low-tech, nurse-controlled measures are first-line and frequently the correct answer before pharmacologic escalation.
Common mistakes to avoid
- Treating only MAP or only ICP instead of both sides of the CPP equation.
- Routinely hyperventilating elevated-ICP patients — it causes ischemia and is reserved for active herniation.
- Applying ischemic-stroke permissive-hypertension logic to a hemorrhagic stroke (or vice versa).
- Missing herniation signs (blown pupil, Cushing's triad, posturing) or delaying escalation.
- Forgetting the glucose check in stroke-like presentations and new altered mentation.
- Neglecting venous-drainage basics (head midline/elevated, non-constricting collars/ties) before reaching for drugs.