Neurologic Emergencies - NREMT AEMT Level

1. What is the first-line AEMT medication class for active generalized convulsive seizure?

   Benzodiazepine. These agents enhance GABA activity to rapidly terminate seizure activity, serving as the initial pharmacologic choice due to efficacy and prehospital availability.

2. What is the target oxygen saturation for most neurologic emergencies when oxygen is indicated?

   Maintain $SpO_2 \geq 94\%$. Maintaining this level prevents hypoxia-induced secondary brain injury without causing vasoconstriction from excessive oxygen in neurologic emergencies.

3. What initial assessment priority best prevents secondary brain injury in neurologic emergencies?

   Airway, oxygenation, and ventilation (prevent hypoxia and hypercapnia). These interventions are critical to mitigate secondary brain injury by ensuring adequate cerebral perfusion and preventing exacerbations from hypoxia or hypercapnia.

4. Which stroke type is most associated with sudden severe headache and signs of increased intracranial pressure?

   Hemorrhagic stroke (intracerebral or subarachnoid hemorrhage). Bleeding into brain tissue or subarachnoid space causes rapid pressure increase, leading to severe headache and meningeal irritation unlike ischemic strokes.

5. What is the hallmark clinical feature of meningitis that should raise suspicion prehospital?

   Fever with headache and neck stiffness (meningismus). Meningeal inflammation from infection causes these symptoms, prompting suspicion for bacterial meningitis and need for droplet precautions and rapid transport.

6. What is the preferred immediate action for a seizing patient with clenched jaw and ineffective ventilation?

   Provide BVM ventilation with adjuncts; do not force objects into mouth. BVM supports oxygenation during tonic-clonic activity when jaw clenching prevents oral airways, while avoiding oral objects prevents injury and aspiration.

7. What is the minimum GCS score that typically indicates need to consider advanced airway control?

   GCS $\leq 8$. Scores at or below this level signify coma and inability to protect the airway, necessitating advanced measures to secure ventilation and oxygenation.

8. What is status epilepticus in the prehospital setting?

   Seizure activity lasting $\geq 5$ minutes or recurrent without recovery. This definition captures prolonged or repeated seizures without neurologic recovery, requiring immediate intervention to prevent neuronal injury and systemic complications.

9. Which complication is most important to prevent during and after seizures in the field?

   Hypoxia from airway obstruction or hypoventilation. Seizures increase oxygen demand while impairing ventilation, making hypoxia a primary risk that exacerbates neuronal damage if not promptly addressed.

10. Which bedside test should be performed as soon as possible for any suspected stroke patient?

    Blood glucose measurement. Rapid glucose assessment identifies hypoglycemia as a reversible stroke mimic, guiding treatment and preventing delays in true stroke management.

11. What is the key prehospital time metric for acute ischemic stroke treatment eligibility?

    Last known well (time patient was last normal). This metric establishes the onset of symptoms, determining eligibility for time-sensitive interventions like thrombolysis within therapeutic windows.

12. What is the preferred prehospital positioning for suspected increased intracranial pressure when not hypotensive?

    Head of bed about $30^\circ$ with midline head/neck. This positioning optimizes venous drainage from the brain to reduce intracranial pressure while maintaining spinal alignment and avoiding hypotension-related ischemia.

13. What is the most appropriate prehospital ventilation strategy for suspected brain herniation with signs of impending arrest?

    Brief controlled hyperventilation to $EtCO_2$ about $30$ to $35\ \text{mmHg}$. Temporary mild hypocapnia induces cerebral vasoconstriction to rapidly decrease intracranial pressure during acute herniation signs, buying time for transport.

14. What finding most strongly suggests spinal cord injury with neurogenic shock rather than hemorrhagic shock?

    Hypotension with bradycardia after spinal trauma. Neurogenic shock from sympathetic disruption causes vasodilation and relative bradycardia, contrasting with tachycardia in volume-loss hemorrhagic shock.

15. What is the definition of a transient ischemic attack (TIA)?

    Transient focal neurologic deficit without persistent infarction. TIA represents reversible ischemia without tissue damage, necessitating urgent evaluation to prevent progression to full stroke.

16. What is the most appropriate next step when a postictal patient is unresponsive but breathing adequately?

    Place in lateral recovery position and monitor airway and breathing. This position facilitates airway patency and drainage of secretions in the confused postictal state, reducing aspiration risk while allowing ongoing assessment.

17. What end-tidal $CO_2$ range is generally targeted to avoid worsening cerebral ischemia in head injury?

    Maintain $EtCO_2$ about $35$ to $45\ \text{mmHg}$. This normocapnic range supports cerebral autoregulation, avoiding vasodilation from hypercapnia or vasoconstriction from hypocapnia that could worsen ischemia.

18. What is the most appropriate prehospital care for suspected spinal cord injury regarding movement and alignment?

    Minimize movement; maintain neutral spinal alignment during extrication. Immobilization prevents further cord damage from unstable vertebrae, prioritizing spinal stability during all handling and transport phases.

19. Which neurologic deficit pattern most strongly suggests a stroke rather than a mimic?

    Sudden focal deficit (face/arm weakness or aphasia) without trauma. This presentation aligns with acute vascular occlusion, distinguishing it from gradual or global deficits seen in metabolic, infectious, or traumatic mimics.

20. What is the classic triad associated with increased intracranial pressure from CNS infection or bleed?

    Altered mental status, vomiting, and headache. These symptoms reflect pressure effects on brain structures, common in infections like meningitis or hemorrhages causing edema and impaired cerebrospinal fluid flow.

21. What Glasgow Coma Scale (GCS) score range defines severe traumatic brain injury?

    GCS $\leq 8$. This score indicates severe impairment in eye, verbal, and motor responses, correlating with high mortality and need for aggressive intervention in traumatic brain injury.

22. What is the single most important stroke mimic to rule out immediately in the field?

    Hypoglycemia. Low blood sugar can mimic stroke symptoms through focal neurologic deficits, requiring immediate correction to avoid misdiagnosis and inappropriate therapy.

23. What prehospital tool is commonly used to screen for stroke using facial droop, arm drift, and speech?

    Cincinnati Prehospital Stroke Scale (CPSS). This validated scale rapidly identifies large vessel occlusions by assessing asymmetry in facial muscles, upper extremity strength, and language function.

24. Which vital sign pattern best matches Cushing reflex from increased intracranial pressure?

    Hypertension, bradycardia, irregular respirations. This triad reflects compensatory responses to rising intracranial pressure, with hypertension maintaining cerebral perfusion against bradycardia and respiratory changes.

25. What pupil finding is most concerning for uncal herniation in a head-injured patient?

    Unilateral fixed, dilated pupil. This sign reflects compression of the oculomotor nerve due to temporal lobe herniation through the tentorial notch, indicating urgent intracranial pressure elevation.

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