# A nurse is assessing a 35-year-old client who was admitted to the emergency department following a motor vehicle accident. The client appears anxious, has dilated pupils, elevated blood pressure (160/95 mmHg), and reports not sleeping for the past 3 days. The client's speech is rapid and pressured, and exhibits hypervigilance and paranoid ideation during the assessment interview. Which assessment finding would be most indicative of stimulant intoxication?

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## 문제

A nurse is assessing a 35-year-old client who was admitted to the emergency department following a motor vehicle accident. The client appears anxious, has dilated pupils, elevated blood pressure (160/95 mmHg), and reports not sleeping for the past 3 days. The client's speech is rapid and pressured, and exhibits hypervigilance and paranoid ideation during the assessment interview. Which assessment finding would be most indicative of stimulant intoxication?

The nurse observes the client exhibiting hypervigilance and paranoid ideation during the assessment interview.

## 보기

1. Elevated blood pressure and tachycardia
2. Hypervigilance and paranoid ideation **✔ 정답**
3. Dilated pupils and insomnia
4. Rapid, pressured speech patterns

**정답: 2**

## 해설

Hypervigilance and paranoid ideation are the most specific findings for stimulant intoxication (e.g., cocaine, methamphetamine), distinguishing it from other substances. Other options are common in stimulant use but less diagnostic.

## 심화 해설

Core Nursing Explanation
**Key Concept Analysis**: This question assesses the ability to identify the most specific clinical sign of Stimulant Intoxication. Stimulants like cocaine, methamphetamine, or amphetamines increase central nervous system (CNS) activity by boosting neurotransmitters like dopamine and norepinephrine. This leads to a classic syndrome of sympathetic nervous system overdrive and psychiatric symptoms. While many signs are present, the question asks for the finding *most indicative*, meaning the one most specific to stimulants and less common in other conditions.

**Answer Rationale**: Key Point! Hypervigilance (an enhanced state of sensory sensitivity and exaggerated scanning of the environment for threats) and Paranoid Ideation (unfounded or exaggerated distrust and suspicion of others) are hallmark **psychiatric** manifestations of stimulant intoxication. They result directly from excessive dopamine activity in the brain's reward and fear pathways. These symptoms are more specific to stimulants than the physical signs of sympathetic arousal, which can be seen in many other conditions (e.g., anxiety disorders, withdrawal from other substances, hyperthyroidism). Therefore, in a differential diagnosis, these psychiatric symptoms strongly point toward stimulant use.

**Distractor Analysis**:
Watch out for confusion! While all options are seen in stimulant intoxication, they are not equally specific.

• Option 1: Elevated blood pressure and tachycardia are classic signs of sympathetic activation. However, they are non-specific and can occur with many substances (e.g., caffeine, nicotine, withdrawal from opioids/benzodiazepines) and medical conditions (e.g., pain, anxiety, hyperthyroidism).

• Option 3: Dilated pupils (mydriasis) and insomnia are also common in stimulant use. Pupil dilation is a sympathetic response, and insomnia is due to CNS stimulation. However, dilated pupils can occur with anticholinergic drugs or brain injury, and insomnia is a ubiquitous symptom in many psychiatric and medical conditions.

• Option 4: Rapid, pressured speech is a key feature of a manic episode in Bipolar Disorder and can also be seen in stimulant intoxication. While it is a strong indicator of increased psychomotor activity, it is not as uniquely tied to stimulants as paranoid psychosis.

**Related Concepts**: It is crucial to differentiate stimulant intoxication from other psychiatric emergencies like an acute manic episode or schizophrenia. The acute onset in the context of a potential accident and the combination with clear physical signs (vital sign changes, pupil dilation) help point toward a substance-induced cause. The nursing priority is ensuring safety (due to paranoia and agitation) and managing acute physiological effects.

Concept Summary
• **Stimulant Intoxication**: CNS and sympathetic overdrive caused by drugs like cocaine, methamphetamine, or prescription amphetamines.

• **Core Mechanism**: Increased dopamine/norepinephrine → euphoria, increased energy, alertness, and, at high doses, psychosis.

• **Key Psychiatric Symptoms**: Hypervigilance, paranoid delusions, agitation, anxiety, and in severe cases, formication (sensation of bugs crawling under the skin).

• **Key Physical Symptoms**: Tachycardia, hypertension, hyperthermia, mydriasis (dilated pupils), diaphoresis, tremors, and insomnia.

• **Nursing Focus**: Safety (prevent harm to self/others), monitor vital signs (especially temperature and cardiac status), provide a calm, low-stimulation environment, and use de-escalation techniques.

Side-by-Side Comparison!

| Feature | Stimulant Intoxication (e.g., Cocaine, Meth) | Opioid Intoxication | Acute Manic Episode (Bipolar) |
| --- | --- | --- | --- |
| Mental Status | Agitated, paranoid, hypervigilant, anxious | Sedated, euphoric then drowsy, apathetic | Elevated/expansive/irritable mood, grandiose, pressured speech |
| Pupils | Dilated (Mydriasis) | Pinpoint (Miosis) | Normal or possibly dilated |
| Vital Signs | ↑ HR, ↑ BP, ↑ Temp, ↑ RR | ↓ HR, ↓ BP, ↓ RR, ↓ Temp | May be elevated due to agitation |
| Psychomotor Activity | Increased, restless, repetitive behaviors | Decreased, lethargic, "nodding off" | Markedly increased, goal-directed activity |
| Key Differentiator | Paranoid psychosis + Sympathetic arousal | Respiratory depression + Pinpoint pupils | Mood disturbance is primary, not drug-induced |

Anatomy, Physiology & Pharmacology Points
• **Neurotransmitters**: Stimulants primarily block the reuptake or increase the release of Dopamine (reward, motor control, psychosis) and Norepinephrine (arousal, alertness, vital signs).

• **Brain Areas**: The Mesolimbic pathway (reward) and the Amygdala (fear, threat detection) are heavily involved, explaining the euphoria and paranoia.

• **Autonomic Nervous System**: Stimulants activate the Sympathetic "fight-or-flight" system, leading to increased cardiac output, bronchodilation, and pupillary dilation.

Memory Tips
• **Mnemonic for Stimulant Effects**: "**H**yper **P**aranoid **A**nd **T**achycardic" (HPAT) – links the key psychiatric (Hypervigilance/Paranoid) and physical (Agitation/Tachycardia) features.

• **Pupil Size**: Remember "**Stimulants = BIG pupils, BIG energy. Opioids = SMALL pupils, SMALL respirations.**"

• Think of the classic portrayal of someone on methamphetamine: constantly looking over their shoulder, thinking they're being watched (paranoia) and unable to sleep for days.

High-Frequency NCLEX Topics
The NCLEX-RN frequently tests the ability to **differentiate between substance intoxication syndromes**. You must know the classic triad for opioids (respiratory depression, coma, pinpoint pupils) and the classic presentation for stimulants (sympathetic arousal + psychosis). Questions often ask for the "most indicative," "priority," or "initial" finding, forcing you to prioritize specificity or urgency.

Watch Out for Question Variations!
• **Shift to Priority Nursing Diagnosis**: "Based on the assessment, which nursing diagnosis is *priority*?" → Answer: Risk for Injury or Risk for Other-Directed Violence related to paranoia and agitation.

• **Shift to Emergency Intervention**: "The client's temperature rises to 104°F (40°C). What is the nurse's *priority action*?" → Answer: Initiate cooling measures (hyperthermia is a life-threatening complication of stimulant overdose).

• **Shift to Medication**: "Which medication would the nurse anticipate administering for severe agitation?" → Answer: A benzodiazepine (e.g., lorazepam) for sedation, not an antipsychotic as first line for acute intoxication.

## 임상 시나리오

Nursing Clinical Practice Guide
**Clinical Scenario**: You are the triage nurse in the ED. A 35-year-old male is brought in by police after being found wandering near a highway, agitated and shouting about people following him. He is diaphoretic, cannot sit still, and his eyes are darting around the room. His initial BP is 168/102, HR 128, RR 28, Temp 38.6°C (101.5°F).

**Nursing Intervention Strategy**:

1. **Safety First**: Place the client in a quiet, private room with minimal stimuli. Remove any potentially harmful objects. Ensure adequate staff are present for de-escalation if needed. Constant observation may be required.

2. **Comprehensive Assessment**: Perform a thorough physical and mental status exam. Use a calm, non-confrontational tone. Ask direct questions about substance use, but be aware paranoid ideation may make him distrustful.

3. **Monitor & Manage Physiology**: Continuously monitor cardiac rhythm, vital signs (watch for hyperthermia and hypertensive crisis), and oxygenation. Provide cool fluids and a cool environment if hyperthermic.

4. **Pharmacological Management**: Anticipate orders for benzodiazepines (e.g., lorazepam IV) to reduce agitation, anxiety, and autonomic hyperactivity. Antipsychotics (e.g., haloperidol) may be used for psychosis but are secondary.

5. **Patient Education & Disposition**: Once stabilized, provide non-judgmental education on the risks of stimulant use. Collaborate with social work or addiction services for referral to detox or treatment programs.

**Patient Safety and Precautions**:
• Key Point! **Never** use physical restraints as a first-line intervention; they can increase agitation, risk of injury, and cause fatal complications like rhabdomyolysis or cardiac arrest in an overheated, stimulant-intoxicated patient.

• Be cautious with antipsychotics like haloperidol, as they can lower the seizure threshold, which is already elevated in stimulant intoxication.

• Monitor for Stimulant Withdrawal: After intoxication subsides, the client may crash into a state of depression, fatigue, and intense craving.

Nursing Procedure & Medication Flow
**Managing Acute Agitation in Stimulant Intoxication**:

1. **De-escalation**: Verbal techniques first. "I can see you're upset. You're safe here. We want to help you."

2. **Medication Administration (Benzodiazepine - Lorazepam)**:

• **Route**: IV preferred for rapid effect in acute settings. IM is an alternative if IV access is difficult and the client is a danger.

• **Dose**: Typically 1-2 mg IV, titrated to effect. Monitor respiratory status closely after administration.

• **Rationale**: Calms the CNS, reduces anxiety and agitation, and can help lower elevated vital signs.

3. **Monitoring Post-Medication**: Continuous monitoring of level of consciousness, respiratory rate (12-20 breaths/min is target), oxygen saturation, and vital signs.

A Word from Your Senior Nurse
"In the chaos of the ED, the patient with stimulant intoxication can be one of the most challenging. Their paranoia makes them see you as a threat, not a helper. Your calm, confident demeanor is your most powerful tool. Remember, the hypertension and tachycardia are scary, but the real immediate danger often comes from their behavior—they can hurt themselves or others. Your nursing assessment, identifying that specific paranoid hypervigilance, is the first critical step in connecting their behavior to a cause, which guides the entire treatment plan. On the NCLEX and in practice, think: 'What makes this picture unique?' That's how you move from task-doer to diagnostician."

## 핵심 개념

- **Stimulant Intoxication** — A clinical syndrome resulting from the recent use of stimulant drugs (e.g., cocaine, amphetamines), characterized by psychological and behavioral changes (euphoria, hypervigilance, paranoia, agitation) and physiological signs (tachycardia, hypertension, pupillary dilation, hyperthermia).
- **Hypervigilance** — An enhanced state of sensory sensitivity accompanied by an exaggerated intensity of behaviors whose purpose is to detect threats. It is a hallmark of stimulant intoxication and PTSD.
- **Paranoid Ideation** — Unfounded or exaggerated distrust and suspicion of others, ranging from mild wariness to severe delusions of persecution. A key psychiatric symptom in stimulant-induced psychosis.
- **Sympathetic Nervous System** — The part of the autonomic nervous system responsible for the "fight-or-flight" response. Stimulant drugs cause excessive activation, leading to increased heart rate, blood pressure, respiratory rate, and pupillary dilation (mydriasis).
- **Differential Diagnosis** — The process of distinguishing a particular condition or disease from others that present with similar clinical features. In this case, distinguishing stimulant intoxication from a primary psychiatric disorder (e.g., manic episode, schizophrenia) or intoxication with other substances.

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