# Psychiatric Emergency Assessment and Risk Stratification

## Introduction

Psychiatric emergencies demand rapid, structured assessment to ensure patient and staff safety while formulating an appropriate disposition. The psychiatric emergency department (PED) is a high-acuity environment where clinicians must simultaneously manage acute agitation, suicidal patients, psychotic decompensation, and intoxicated individuals. Effective **risk stratification** is the cornerstone of safe and efficient emergency psychiatric care.

## The Psychiatric Emergency Assessment

### Triage and Initial Safety

Ensure a **safe environment**: remove sharps, ligature points, and potential weapons. Conduct a **weapons search** and belongings check per institutional protocol. Assign appropriate observation level (1:1, line of sight, or general observation) Vital signs are mandatory; psychiatric presentations may have life-threatening medical causes. Obtain collateral information early: EMS reports, family contacts, outpatient providers, prior records.

### The Focused Psychiatric Interview

**Chief complaint and history of present illness**: onset, duration, precipitants, associated symptoms. **Safety assessment**: suicidal ideation, plan, intent, access to means; homicidal ideation; self-harm. **Substance use**: recent intoxication, withdrawal timeline, substances used. **Psychiatric history**: prior diagnoses, hospitalizations, medication trials, response to treatment. **Medical history**: concurrent medical conditions, current medications, recent changes. **Mental status examination**: appearance, behavior, speech, mood, affect, thought process, thought content, perceptions, cognition, insight, judgment.

![Checklist showing the essential components of a psychiatric emergency assessment](/images/psychiatry/psych-emergency-checklist.png)

## Medical Clearance

**Medical clearance** is the process of identifying and addressing acute medical conditions that may cause or complicate psychiatric presentations. No universal protocol exists; assessment should be guided by clinical presentation. Routine screening typically includes: vital signs, blood glucose, urine drug screen, pregnancy test (when applicable) Expanded workup when indicated: CBC, BMP, LFTs, thyroid function, blood alcohol level, urinalysis, ECG, head CT. Always evaluate for **delirium**: fluctuating consciousness, disorientation, visual hallucinations, acute onset. Common medical mimics: hypoglycemia, intoxication/withdrawal, head injury, infection, thyroid disease, medication side effects.

## Risk Stratification Frameworks

### Suicide Risk

Use a **structured approach** rather than relying solely on clinical intuition. Assess static (historical) risk factors: prior attempts, psychiatric diagnosis, family history of suicide. Assess dynamic (modifiable) risk factors: current ideation, hopelessness, agitation, insomnia, substance intoxication. Protective factors: social support, reasons for living, engagement in treatment, children in the home. Stratify as **low, moderate, or high risk** based on the totality of findings. Risk stratification guides disposition, not prediction.

### Violence Risk

History of violence is the strongest predictor of future violence. Acute risk factors: intoxication, psychosis with command hallucinations, paranoid ideation, agitation. Use structured clinical judgment rather than unstructured assessment.

### Involuntary Detention Criteria

Varies by jurisdiction but generally requires **imminent danger to self or others** or **grave disability**. The clinician must document the specific behaviors and clinical findings supporting involuntary hold. Know your state-specific statutes and time frames.

## Diagnostic Considerations in the Emergency Setting

### Psychotic Presentations

Differentiate primary psychotic disorder from substance-induced psychosis, delirium, and medical illness. First-episode psychosis requires thorough medical workup including neuroimaging and laboratory studies. **Catatonia** should be assessed with the Bush-Francis Catatonia Rating Scale; a lorazepam challenge may be diagnostic and therapeutic.

### Suicidal Presentations

Covered in detail in Lecture 49. Brief screening tools: **Columbia Suicide Severity Rating Scale (C-SSRS)**, **ASQ (Ask Suicide-Screening Questions)**.

### Agitated Presentations

Covered in detail in Lecture 50. Prioritize verbal de-escalation before pharmacological or physical interventions.

### Intoxication and Withdrawal

Alcohol withdrawal: use the **CIWA-Ar** protocol; benzodiazepines are first-line. Opioid overdose: naloxone administration; observe for re-sedation. Stimulant intoxication: supportive care, benzodiazepines for agitation and sympathomimetic symptoms.

![Flowchart showing the triage and risk stratification algorithm in the psychiatric emergency department](/images/psychiatry/ed-risk-stratification-flowchart.png)

## Disposition Planning

| Disposition | Indication | Risk Level | Key Considerations |
|-------------|-----------|-----------|-------------------|
| Inpatient psychiatric admission | High suicide/violence risk; inability to self-care; psychosis | High | Least restrictive effective level; document rationale |
| Crisis stabilization unit | May stabilize in 24-72 hours; moderate risk | Moderate-High | Short-stay alternative; brief observation |
| Partial hospitalization / IOP | Insufficient for inpatient; needs structure | Moderate | Requires adequate support system at home |
| Discharge with outpatient follow-up | Low risk; safety plan in place; support available | Low | Schedule follow-up within 7 days; provide crisis resources |
| Medical admission | Acute medical condition requiring treatment | Variable | Psychiatry consultation; 1:1 if suicidal |

**Inpatient psychiatric admission**: indicated for high suicide or violence risk, inability to care for self, psychosis requiring stabilization. **Crisis stabilization unit**: short-stay alternative for patients who may stabilize within 24-72 hours. **Partial hospitalization or intensive outpatient**: step-down for moderate-risk patients with adequate support. **Discharge with outpatient follow-up**: appropriate for low-risk patients with safety plans, support, and access to care. **Medical admission**: when acute medical conditions require inpatient medical treatment. Always ensure **continuity of care**: provide prescriptions, outpatient appointments, crisis resources at discharge.

## Documentation

Document the risk-benefit analysis for disposition decisions. Record specific risk and protective factors identified. Note the clinical reasoning for the chosen level of care. Document collateral sources contacted and information obtained. Include safety planning and discharge instructions.

![Template showing key elements of emergency psychiatric documentation including risk assessment, clinical reasoning, and disposition rationale](/images/psychiatry/ed-psych-documentation-template.png)

## Key Clinical Pearls

Vital signs are not optional in psychiatric emergencies; tachycardia, fever, or hypertension may signal a medical emergency masquerading as a psychiatric crisis. Risk stratification is about informing clinical decision-making, not predicting future events; document your reasoning, not a prediction. Collateral information is often the most valuable data in the emergency setting; always attempt to contact family, outpatient providers, and review prior records. The most dangerous moment in emergency psychiatry is premature closure: anchoring on a psychiatric diagnosis before adequately ruling out medical causes.

## References

1. Zun LS. Evidence-based evaluation of psychiatric patients. *J Emerg Med*. 2005;28(1):35-39.
2. Nordstrom K, Zun LS, Wilson MP, et al. Medical evaluation and triage of the agitated patient: consensus statement of the American Association for Emergency Psychiatry. *West J Emerg Med*. 2012;13(1):3-10.
3. Large M, Ryan C, Nielssen O. The validity and utility of risk assessment for inpatient suicide. *Australas Psychiatry*. 2011;19(6):507-512.
4. Stowell KR, Florence P, Harman HJ, Glick RL. Psychiatric evaluation of the agitated patient: consensus statement of the American Association for Emergency Psychiatry Project BETA. *West J Emerg Med*. 2012;13(1):11-16.