Neurologic Emergencies and Altered Mental Status - NREMT Paramedic Level

1. Identify the likely cause: AMS with diaphoresis, tachycardia, and glucose $45$ mg/dL.

   Hypoglycemia. Low glucose impairs brain energy supply, triggering sympathetic response with sweating and tachycardia to mobilize reserves.

2. What is the classic triad of increased intracranial pressure called?

   Cushing triad. Named after Harvey Cushing, this physiologic response signals critically elevated intracranial pressure requiring urgent intervention.

3. What is the immediate prehospital action when altered mental status is suspected to be hypoglycemia?

   Check blood glucose and treat if low. Hypoglycemia is a common, reversible cause of altered mental status, so rapid glucose assessment and correction prevent further neurologic deterioration.

4. Which breathing pattern is associated with increased intracranial pressure and brain injury?

   Cheyne–Stokes respirations. This pattern of cyclic breathing with periods of apnea reflects brainstem dysfunction from pressure or injury in neurologic emergencies.

5. Identify the likely cause: AMS with hot dry skin, mydriasis, urinary retention, and tachycardia.

   Anticholinergic poisoning. Anticholinergic effects block parasympathetic functions, causing dry skin, dilated pupils, retention, and accelerated heart rate with delirium.

6. Which assessment tool is used prehospital to rapidly screen for acute stroke?

   Cincinnati Prehospital Stroke Scale (CPSS). This tool evaluates facial droop, arm drift, and speech abnormalities to quickly identify potential large vessel occlusion strokes in the field.

7. Identify the likely toxidrome: bradypnea, miosis, and decreased mental status after pills found.

   Opioid toxidrome. Opioids depress respiration and consciousness while constricting pupils, with scene evidence supporting overdose as the cause.

8. Identify the likely diagnosis: fever, neck stiffness, photophobia, and altered mental status.

   Meningitis (suspected CNS infection). These symptoms suggest meningeal irritation from infection, where inflammation causes neck rigidity, light sensitivity, and encephalopathy.

9. What is the first-line medication class for actively seizing patients in the field?

   Benzodiazepines. These enhance GABA activity to rapidly terminate seizures, making them preferred for prehospital management due to efficacy and administration ease.

10. What is the standard prehospital blood glucose threshold that defines hypoglycemia?

    Blood glucose < $60$ mg/dL. This threshold indicates symptomatic hypoglycemia requiring intervention, as levels below it can cause altered mental status and necessitate glucose administration.

11. Which toxidrome is suggested by hyperthermia, agitation, mydriasis, and diaphoresis?

    Sympathomimetic toxidrome. Stimulants like cocaine or amphetamines cause excessive sympathetic activation, producing these signs of hyperadrenergic state in overdose.

12. Which stroke type is most associated with a sudden severe headache and rapid decline in mental status?

    Hemorrhagic stroke (intracranial hemorrhage). Bleeding into brain tissue causes rapid pressure buildup, leading to intense headache and swift neurologic deterioration compared to ischemic types.

13. What pupil finding suggests uncal herniation from increased intracranial pressure?

    Unilateral fixed, dilated pupil. This indicates compression of the oculomotor nerve on the affected side, signaling impending herniation and need for immediate ICP management.

14. What is the single most important historical detail for suspected stroke treatment decisions?

    Last known well time. This determines eligibility for time-sensitive therapies like thrombolysis, as treatment windows are based on symptom onset in acute stroke.

15. What pupil finding is classically associated with opioid toxidrome in altered mental status?

    Miosis (pinpoint pupils). Opioids cause central nervous system depression, leading to constricted pupils due to parasympathetic overstimulation in overdose scenarios.

16. Identify the likely condition: unilateral arm drift, facial droop, and slurred speech with normal glucose.

    Acute ischemic stroke (suspected). These focal neurologic deficits match CPSS criteria, pointing to vessel occlusion with normal glucose ruling out metabolic mimics.

17. What is the GCS total score range?

    $3$ to $15$. The Glasgow Coma Scale sums eye opening, verbal response, and motor response scores, providing a standardized measure of consciousness level.

18. What are the three findings in Cushing triad?

    Hypertension, bradycardia, irregular respirations. These signs result from brainstem compression, where hypertension compensates for pressure, bradycardia from vagal stimulation, and respirations become abnormal.

19. Which toxidrome is suggested by hyperthermia, delirium, mydriasis, and dry skin?

    Anticholinergic toxidrome. Blockade of muscarinic receptors leads to inhibited sweating, confusion, pupil dilation, and fever, as seen in atropine or antihistamine toxicity.

20. What GCS score defines severe traumatic brain injury?

    GCS $\leq 8$. Scores of 8 or below indicate coma and high risk of poor outcomes, guiding urgent interventions like airway management in trauma patients.

21. Which clinical state commonly follows a generalized tonic-clonic seizure and causes confusion?

    Postictal state. Following neuronal exhaustion from seizure activity, this phase involves recovery with transient confusion, amnesia, and lethargy.

22. What term describes a seizure lasting $\geq 5$ minutes or recurrent seizures without recovery?

    Status epilepticus. This definition captures prolonged or repeated convulsive activity, requiring prompt intervention to prevent neuronal damage and systemic complications.

23. Which GCS component assesses the best verbal response?

    V (Verbal response) component. This assesses orientation and language function, scoring from 1 (none) to 5 (oriented), reflecting brain function in altered mental status.

24. Which prehospital vital sign abnormality must be corrected first in any altered mental status patient?

    Hypoxia (low oxygen saturation). Adequate oxygenation is critical for brain function, and correcting hypoxia prevents secondary injury in patients with neurologic compromise.

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