Behavioral Health

Violence risk assessment in clinical settings

Clinical Overview and When to Suspect Imminent Violence Risk

— Most psychiatric patients are not violent; mental illness alone accounts for only ~3-5% of population-level violence

— Risk concentrates in: active psychosis with persecutory delusions, substance intoxication/withdrawal, antisocial/borderline traits, acute mania, neurocognitive disorders with agitation, and TBI

— Substance use is a stronger predictor than primary psychotic illness

— Emergency department psychiatric holds

— Pre-discharge from inpatient psychiatry

— Outpatient threats voiced toward identifiable victims

— Workplace violence concerns in occupational medicine

— Forensic and correctional consults

— Domestic violence screening in primary care

— Patient verbalizes specific threat with identified target, time, and means

— Command auditory hallucinations directing harm

— Recent loss (job, relationship, custody) plus access to firearms

— Escalating agitation, pacing, clenched fists, invasion of personal space

— Stalking behavior or repeated boundary violations

— Prior violent acts — the single strongest predictor of future violence

Definition: Violence risk assessment is the structured clinical evaluation of a patient's likelihood of harming others in the near term (hours to weeks), distinct from long-term recidivism prediction used in forensic settings.

Epidemiology and base rates:

Clinical settings where assessment is mandatory:

When to actively suspect elevated risk:

Step 3 management: When violence risk is suspected, your first move is environmental safety (remove sharps, position yourself near exit, alert security) before formal interview — not labs, not medications. Document risk factors, protective factors, and clinical reasoning; a checklist alone is insufficient without narrative justification.

Board pearl: Static risk factors (age, sex, history) inform baseline risk; dynamic factors (intoxication, medication nonadherence, active symptoms) drive imminent risk and are the ones you actually modify.

Presentation Patterns and Key History

— Past violence: age at first violent act, frequency, severity, weapons used, victims (strangers vs. intimates), arrests, prior involuntary holds

— Current ideation: thoughts of harming others, specific targets, plan, means, intent, rehearsal behaviors

— Access to weapons: firearms in home, recent purchases, ammunition, knives, vehicles used as weapons

— Substance use: alcohol, stimulants (methamphetamine, cocaine), PCP, synthetic cannabinoids, anabolic steroids, withdrawal states

— Psychiatric symptoms: persecutory delusions, command hallucinations, paranoia about specific individuals, jealous delusions (Othello syndrome)

— Triggers and context: interpersonal conflict, perceived disrespect, custody battles, eviction, recent humiliation

— Young male with antisocial PD + stimulant use + firearm access + recent breakup

— Psychotic patient with persecutory delusions naming a specific neighbor or coworker

— Manic patient with grandiose-irritable mix, sleep deprivation, and disinhibition

— Demented patient with sundowning, misidentification syndromes, caregiver as target

— Patient with TBI affecting orbitofrontal cortex showing impulsive aggression

— Pathway behavior (research, planning, preparation)

— Fixation on a target

— Identification with prior attackers/warriors

— Novel aggression (testing capacity to harm)

— Energy burst before attack

— Leakage (telling third party about intent)

— Last resort signals (no other options)

Core history elements — the violence risk interview:

Collateral information is essential — family, prior records, police reports, probation officers; never rely on patient self-report alone.

High-risk presentation patterns:

Warning behaviors (Meloy's typology):

Key distinction: Affective (reactive) violence is impulsive, emotion-driven, autonomic arousal high — respond with de-escalation. Predatory (instrumental) violence is planned, goal-directed, low arousal — these patients require containment and law enforcement, not therapeutic alliance.

Board pearl: "Leakage" to a third party (text, social media post, comment to coworker) is one of the most actionable warning signs on Step 3 vignettes.

Behavioral Exam and Mental Status Findings

— Appearance: disheveled, intoxicated, dilated/constricted pupils, injected sclerae, knuckle abrasions

— Behavior: psychomotor agitation, pacing, refusing to sit, hypervigilance, scanning, clenched jaw

— Speech: loud, pressured, threatening, profanity, refusal to engage

— Affect: irritable, labile, suspicious, contemptuous, or eerily flat (concerning for predatory type)

— Thought content: persecutory delusions naming specific targets, command hallucinations to harm, homicidal ideation with plan

— Insight/judgment: externalization of blame, no remorse for prior acts, minimization

— Tachycardia, tachypnea, diaphoresis, mydriasis

— Reddened face, dilated nostrils

— Voice rising in pitch and volume

— Verbal threats escalating to vulgarity

— Sustained eye contact or fixed staring

— Sudden quieting (ominous — may precede attack)

— Vital signs (hyperthermia → sympathomimetic toxicity, NMS, serotonin syndrome)

— Glucose (hypoglycemia mimics agitation)

— Pupils, reflexes, clonus (serotonin syndrome)

— Neurologic exam for focal deficits suggesting TBI, stroke, encephalitis

— Skin: track marks, abscesses, trauma patterns

— Two exits from room ideally; never let patient between you and door

— Remove neckties, stethoscope from neck, pens from sight

— Maintain ~2 arm-lengths distance

— Security visible but not provocative

— Avoid touching, sudden movements, prolonged eye contact

Observe before you interview — gait, posture, facial tension, hand position, distance maintained.

Mental status exam high-yield findings:

Physiologic/autonomic signs of imminent aggression:

Medical exam — rule out organic causes of agitation:

Interview safety principles:

Step 3 management: If you see the autonomic prodrome (tachycardia, pacing, rising voice), offer PO medication and verbal de-escalation now — do not wait for the punch. Document the offer and response.

Board pearl: A previously agitated patient who becomes suddenly calm and focused is not improving — this is often the pre-attack quieting phase.

Structured Assessment Tools and Initial Workup

— HCR-20 (Historical-Clinical-Risk Management-20): 20 items across historical (10), clinical (5), and risk management (5) domains; gold standard SPJ tool

— VRAG (Violence Risk Appraisal Guide): actuarial, primarily forensic, long-term risk

— Brøset Violence Checklist (BVC): 6 items (confusion, irritability, boisterousness, verbal threats, physical threats, attacks on objects); designed for inpatient short-term (24h) prediction

— DASA (Dynamic Appraisal of Situational Aggression): inpatient, 7 items, similar 24h window

— MOAS (Modified Overt Aggression Scale): tracks aggressive events over time, useful for monitoring response to treatment

— COVR (Classification of Violence Risk): computerized actuarial tool for discharged psychiatric patients

— Fingerstick glucose

— CBC, BMP, LFTs, TSH

— Urine toxicology (cocaine, amphetamines, PCP, cannabinoids, opioids, benzos)

— Blood alcohol level

— Pregnancy test in females of reproductive age (affects medication choice)

— CT head if first-episode psychosis, focal deficits, trauma, age >40 with new behavioral change

— Consider ammonia, B12, RPR, HIV, ceruloplasmin per clinical context

— EEG if suspicion of complex partial seizures or encephalopathy

Why use structured tools: Unaided clinical judgment performs only modestly better than chance for violence prediction; structured professional judgment (SPJ) improves reliability and is defensible in court.

Commonly referenced instruments:

Medical workup of the agitated/threatening patient:

Key distinction: Structured tools augment clinical judgment; they do not replace it. A high HCR-20 score with no current target and protective factors may be lower imminent risk than a low-score patient with a loaded gun and a named victim tonight.

Board pearl: On Step 3, the answer to "what is the best predictor of future violence" is almost always history of past violence, not any score.

Advanced and Confirmatory Evaluation

— First-episode psychosis with violence

— New-onset aggression in patient >40 without psychiatric history

— Atypical features: olfactory hallucinations, focal neuro signs, seizures, autonomic instability

— Suspected autoimmune, paraneoplastic, or infectious encephalitis

— MRI brain (preferred over CT for tumor, MS, limbic encephalitis, frontotemporal dementia)

— LP with CSF studies: cell count, protein, glucose, anti-NMDA receptor antibodies, autoimmune encephalitis panel, HSV PCR, VDRL

— EEG: ictal aggression is rare but consider in stereotyped, brief, postictal-confusion presentations

— Neuropsychological testing: characterize executive dysfunction, impulsivity, frontal release signs in TBI or dementia

— Genetic/metabolic workup: if young patient with movement disorder + aggression (Huntington, Wilson, porphyria)

— PCL-R (Psychopathy Checklist-Revised) — used in forensic, not routine clinical settings; requires trained rater and extensive collateral

— Personality assessment (MMPI-3, PAI) when diagnostic clarity needed for malingering vs. genuine pathology

— Substance use assessment with structured tools (AUDIT, DAST)

— In workplace, school, or healthcare settings, multidisciplinary threat assessment teams (clinician, HR/admin, security, legal, law enforcement liaison) evaluate communicated threats

— Operate on threat assessment model (pathway to violence, warning behaviors) rather than profile-based prediction

When to extend the workup beyond initial labs:

Advanced studies to consider:

Psychometric/forensic evaluation:

Threat assessment teams:

CCS pearl: For the inpatient CCS case of escalating agitation, advance the clock with q1-2h BVC reassessments, document, and titrate interventions; do not order MRI in the middle of acute agitation — stabilize first, image later.

Key distinction: Risk assessment = probability estimate over a time window; threat assessment = case-specific analysis of a particular individual on a pathway toward a particular target. Boards may test the latter for school/workplace shooter prevention.

Risk Stratification and Management Logic

— Low: vague ideation, no plan, no target, no means, intact reality testing, engaged in care, protective factors present → outpatient management with safety planning

— Moderate: ideation with some plan or target, ambivalent, partial insight, recent stressors, some access to means → intensive outpatient, partial hospitalization, frequent follow-up, means restriction

— High/imminent: clear plan + target + means + intent, command hallucinations, recent rehearsal, refusal to engage → involuntary hospitalization, security, restraints if needed

1. Ensure environmental safety (positioning, security, remove means)

2. Verbal de-escalation — calm tone, validate, offer choices, set limits

3. Offer PO medication (oral lorazepam or olanzapine ODT)

4. IM medication if PO refused and risk continues

5. Physical/chemical restraint as last resort with continuous monitoring

— Respect personal space (2 arm-lengths)

— Do not be provocative; hands visible, calm posture

— Establish verbal contact (one clinician speaks)

— Be concise; use simple language

— Identify wants and feelings

— Listen closely

— Agree or agree to disagree

— Set clear limits

— Offer choices and optimism

— Debrief patient and staff after

— Imminent danger to others + mental illness → involuntary hold (state-specific statute, e.g., 5150 in CA, 9.39 in NY)

— Threat without mental illness → law enforcement notification, not psychiatric admission

— Identifiable third-party target → duty to warn/protect (Tarasoff)

Three-tier imminent risk stratification:

The five-step management algorithm:

Verbal de-escalation principles (Project BETA):

Disposition decision tree:

Step 3 management: The vignette of "agitated patient escalating in ED" — your ordered sequence is verbal de-escalation → offered PO meds → IM meds → restraints, with documentation at each step. Skipping steps without justification is the wrong answer.

Board pearl: Restraints require continuous 1:1 observation, q15min vitals/circulation checks, and physician re-evaluation per CMS rules (q1h for violent restraints in adults).

Pharmacotherapy — Acute Agitation Management

— Lorazepam 1-2 mg PO — fastest acting benzo orally; useful when etiology unclear or alcohol/stimulant intoxication

— Olanzapine 5-10 mg ODT — rapid dissolving, good for psychosis-driven agitation

— Risperidone 1-2 mg PO (oral solution) — alternative

— Haloperidol 5 mg PO + lorazepam 2 mg PO + benztropine 1 mg ("B-52" oral variant) — combination for severe agitation

— Olanzapine 10 mg IM — effective, sedating; do not combine with IM benzodiazepine (risk of respiratory depression and hypotension)

— Haloperidol 5 mg IM + lorazepam 2 mg IM + diphenhydramine 50 mg or benztropine 1-2 mg IM — classic "5-2-1" or "B-52"; covers EPS prophylaxis

— Ziprasidone 10-20 mg IM — check QTc first

— Aripiprazole 9.75 mg IM — less sedating, useful when alertness needed

— Droperidol 2.5-5 mg IM — boxed warning for QT but fast and effective

— Alcohol/sedative withdrawal: benzodiazepines first (lorazepam, diazepam) — avoid antipsychotics that lower seizure threshold

— Stimulant intoxication (cocaine, meth): benzodiazepines first; antipsychotics second

— Psychotic agitation: antipsychotics first

— Delirium (medical): haloperidol low-dose or atypical; avoid benzodiazepines except in withdrawal (worsen delirium)

— Dementia-related agitation: non-pharm first; if needed, low-dose risperidone or quetiapine (boxed warning for mortality); avoid benzos (paradoxical disinhibition, falls)

— Pregnancy: haloperidol preferred IM; avoid benzos in first trimester if possible

— Continuous pulse oximetry, q15min vitals, airway, hydration

— ECG if QT-prolonging agent + risk factors

— Reassess for ongoing need; remove restraints at earliest safe moment

First-line oral options (preferred when patient cooperative):

IM regimens when PO refused:

Etiology-specific choices:

Monitoring during/after sedation:

Board pearl: Never give IM olanzapine + IM lorazepam together — combined cardiorespiratory depression is the classic test answer.

Containment, Restraint, and Procedural Management

— Environmental modification (quiet room, dim lights, reduce stimuli)

— Verbal de-escalation

— Voluntary time-out / open seclusion

— PO medication

— IM medication

— Locked seclusion

— Physical restraint (4-point or 5-point)

— Order by physician/LIP within 1 hour of initiation

— Time-limited orders: 4 hours adult, 2 hours ages 9-17, 1 hour <9

— Face-to-face evaluation within 1 hour by physician or trained RN

— Continuous 1:1 observation

— q15 minute documentation of circulation, ROM, vitals, hydration, toileting, behavior

— Renewal requires new order; discontinue at earliest safe moment

— Debrief patient and staff after every restraint episode

— Locked seclusion = same regulatory requirements as physical restraint

— Risk of unwitnessed deterioration; continuous video or in-person observation required

— Positional asphyxia (especially prone restraint — avoid prone or use only briefly)

— Aspiration if heavily sedated

— Rhabdomyolysis from struggle

— DVT from prolonged immobilization

— Psychological retraumatization

— Clinical justification (specific behaviors, less-restrictive measures tried)

— Time of initiation, medications given, response

— Q15 min checks

— Time of release and debrief

Hierarchy of containment (least to most restrictive):

Restraint indications: Imminent danger to self or others when less restrictive measures have failed or are not feasible. Never for staff convenience, punishment, or as a substitute for monitoring.

CMS/Joint Commission requirements (violent/self-destructive restraints, adults):

Seclusion-specific considerations:

Adverse events with restraint:

Documentation requirements:

Step 3 management: When the vignette asks "what is the next best step" after restraint placement — the answer is face-to-face evaluation within 1 hour and order written, not "leave restraints in place for the shift."

CCS pearl: On CCS, after ordering restraints, advance time in short increments (15-30 min) ordering reassessment, vitals, and removal as soon as criteria met — leaving restraints on too long loses points.

Special Populations — Elderly and Renal/Hepatic Impairment

— Always rule out delirium first — UTI, pneumonia, hypoxia, hyponatremia, medication side effect, fecal impaction, pain

— Underlying dementias: Alzheimer (later aggression), vascular (variable), Lewy body (sensitive to antipsychotics), frontotemporal (disinhibition, early aggression)

— Sensory deficits (hearing, vision) amplify confusion-driven agitation

— Avoid benzodiazepines — paradoxical agitation, falls, delirium, respiratory depression (Beers criteria)

— Antipsychotics carry boxed warning for increased mortality in dementia (mostly cardiovascular, infectious); use lowest dose, shortest duration, document risk-benefit discussion with family

— Avoid haloperidol high-dose IV — QT prolongation, torsades; if used, ECG monitoring

— Lewy body dementia: antipsychotics can cause severe neuroleptic sensitivity; quetiapine or pimavanserin preferred

— Anticholinergics (diphenhydramine, benztropine) worsen delirium — avoid as adjuncts in elderly

— Risperidone: active metabolite renally cleared, reduce dose if CrCl <30

— Paliperidone: 50% renally excreted, dose adjust

— Lithium: contraindicated in significant CKD

— Gabapentin (sometimes used for agitation): reduce dose

— Most antipsychotics hepatically metabolized; start low

— Lorazepam, oxazepam, temazepam (LOT) preferred benzos — glucuronidation only, no hepatic oxidation

— Avoid diazepam, chlordiazepoxide in cirrhosis

— Valproate, carbamazepine: avoid or monitor closely

— Reorientation, familiar objects, family presence, addressing unmet needs (pain, thirst, toileting), reducing tethers (Foleys, lines), promoting day-night cycle

Elderly with agitation — distinct considerations:

Pharmacologic cautions:

Renal impairment:

Hepatic impairment:

Non-pharmacologic first-line in elderly:

Board pearl: In dementia with agitation, non-pharmacologic interventions are first-line; if behavior poses imminent harm, low-dose risperidone is the most evidence-based choice — but counsel on boxed warning for mortality.

Key distinction: Sundowning ≠ delirium. Sundowning is circadian agitation in established dementia; delirium is acute, fluctuating, with inattention and altered consciousness from a medical cause.

Special Populations — Pregnancy, Pediatrics, and Other Subgroups

— Acute agitation: haloperidol preferred IM — long safety record; olanzapine also acceptable

— Avoid benzodiazepines in first trimester if possible (cleft lip association weak but cited); near term they cause neonatal floppy infant syndrome and withdrawal

— Avoid valproate (neural tube defects, neurodevelopmental impairment) and carbamazepine

— Lithium: cardiac (Ebstein anomaly) risk small; risk-benefit individualized

— Restraint use: lateral decubitus, not supine, to avoid IVC compression after 20 weeks

— Verbal de-escalation, parental presence, distraction first

— PO options: diphenhydramine, hydroxyzine for mild; risperidone, olanzapine ODT for moderate

— IM: olanzapine, ziprasidone (with ECG), or diphenhydramine + haloperidol; avoid droperidol in young children

— Restraint time limits stricter: 2 hours ages 9-17, 1 hour <9

— Always assess for trauma history, autism spectrum, ADHD, learning disability, abuse — agitation is often communication

— Autism spectrum: risperidone and aripiprazole FDA-approved for irritability/aggression

— Alcohol withdrawal–related agitation: benzodiazepines (CIWA-driven), thiamine, fluids

— Stimulant intoxication: benzodiazepines, cooling, hydration

— Opioid withdrawal: clonidine, lofexidine, buprenorphine — not typically violent but irritable

— Pain, constipation, ear infection, dental issues commonly present as aggression

— Establish baseline behavior with caregivers

— Behavioral interventions first; pharmacology as adjunct

— Heightened risk of malingering; collateral and observation essential

— Coordinate with correctional medical staff and security; chain custody for evidence (e.g., shanks, contraband)

— Hyperarousal-driven aggression; trauma-informed approach (predictable, choices, avoid surprise touch)

— Prazosin for nightmares; SSRIs for PTSD; avoid benzodiazepines long-term (worsen PTSD outcomes)

Pregnancy:

Pediatric agitation:

Substance use disorder patients:

Patients with intellectual or developmental disability:

Forensic/incarcerated patients:

Veterans/PTSD:

Step 3 management: Pregnant agitated patient — haloperidol IM, left lateral position, fetal monitoring per gestational age, OB consult.

Board pearl: In autistic children, risperidone and aripiprazole are the two FDA-approved agents for irritability/aggression.

Complications and Adverse Outcomes

— Restraint-related injuries: asphyxia (especially prone), brachial plexus injury, skin breakdown, fractures from struggle, rhabdomyolysis

— DVT/PE from prolonged immobilization

— Aspiration pneumonia in oversedated patient

— Neuroleptic malignant syndrome (NMS): hyperthermia, rigidity, autonomic instability, elevated CK after high-dose antipsychotics

— Dystonia, akathisia, EPS from haloperidol — akathisia can paradoxically worsen agitation

— QT prolongation, torsades with haloperidol, ziprasidone, droperidol — especially with hypokalemia, hypomagnesemia

— Oversedation, respiratory depression especially with benzodiazepine + opioid or IM olanzapine + IM benzo combinations

— Anticholinergic delirium from diphenhydramine, benztropine adjuncts

— Paradoxical disinhibition with benzodiazepines (elderly, brain-injured)

— Direct assault injuries (head, face, bites, needlesticks)

— Psychological sequelae: PTSD, burnout, vicarious traumatization in nursing/security staff

— Sharps and weapons brought into clinical area

— Homicide of identified target if duty-to-warn unmet

— Intimate partner violence escalation

— Workplace shootings if threat assessment inadequate

— Sentinel events trigger Joint Commission root cause analysis

— Litigation: failure to predict (limited duty), failure to assess and document (clear duty), failure to warn/protect identifiable victim (Tarasoff jurisdictions)

— Loss of license, criminal liability in egregious cases

Patient complications from agitation and its treatment:

Staff and bystander complications:

Third-party harm:

Systems-level adverse outcomes:

Step 3 management: Post-restraint, always debrief patient and staff, document precipitants, review whether interventions could have been earlier or less restrictive — this is a quality-improvement requirement, not optional.

Board pearl: A patient who develops akathisia after IM haloperidol may appear more agitated; treat with propranolol or benztropine/lorazepam, not more haloperidol — this is a classic distractor.

Key distinction: NMS (rigidity, slow onset, days) vs. serotonin syndrome (clonus, hyperreflexia, GI, faster onset, hours) — both can present in agitated patients on polypharmacy.

Escalation of Care — Consult, Admission, and Transfer

— Any new homicidal ideation

— Persistent agitation despite first-line interventions

— Diagnostic uncertainty (primary psychiatric vs. medical)

— Need for involuntary hold decision

— Pre-discharge clearance after a violent incident

— Predatory threats or weapons present

— Active warrant or known forensic status

— Threat against identifiable victim outside the hospital (Tarasoff)

— Need for transport between facilities

— Mental illness AND

— Imminent danger to others (and/or self, and/or grave disability)

— Less restrictive alternatives insufficient

— Specific statutes vary by state (5150 in CA = 72h; similar in other states)

— Always offer voluntary admission first if patient has capacity to consent

— Convert to involuntary if patient refuses and meets criteria

— Document capacity assessment for treatment decisions separately from commitment criteria

— Medical floor with sitter: acute medical instability, delirium workup ongoing, withdrawal management

— Psych unit: medically stable, primary psychiatric driver

— ICU: severe NMS, serotonin syndrome, severe overdose, intubated post-sedation

— EMTALA: stabilize before transfer; ensure receiving facility accepts and has capacity

— Inter-facility violent patient transport requires secure transport (police, secure ambulance), sedation as needed

— Forensic patients require chain-of-custody handoff

When to consult psychiatry (if not already involved):

When to involve security/law enforcement:

Criteria for involuntary psychiatric hospitalization:

Voluntary vs. involuntary admission decision:

When to admit to medical floor vs. psychiatric unit:

Transfer considerations:

CCS pearl: On CCS, for the violent patient in the ED, sequence is: stabilize and de-escalate → labs and toxicology → psychiatry consult → involuntary hold paperwork → secure inpatient admission with sitter. Discharging an actively threatening patient is always wrong.

Step 3 management: If the patient meets criteria for involuntary hold but the receiving psychiatric facility has no beds (a real-world common scenario), the answer is continue to hold in ED with appropriate monitoring, not discharge — boarding is preferable to releasing a dangerous patient.

Key Differentials — Psychiatric Causes of Violent Behavior

— Schizophrenia/schizoaffective: persecutory delusions, command hallucinations; risk elevated during first episode, when nonadherent, with substance use, and in young males

— Delusional disorder, persecutory or jealous type: Othello syndrome (delusion of infidelity) carries high homicide risk toward partner

— Brief psychotic disorder, postpartum psychosis: infanticide/suicide risk

— Bipolar mania with irritable/mixed features: disinhibition, grandiosity, sleep deprivation

— Major depression with psychotic features: rare altruistic homicide-suicide (kills family "to spare them")

— Antisocial PD: instrumental aggression, callousness, criminal history; high recidivism

— Borderline PD: impulsive, affective aggression often toward intimates; usually self-directed but can be reactive interpersonal violence

— Narcissistic PD: rage in response to perceived humiliation

— Paranoid PD: persistent suspiciousness without frank psychosis

— Alcohol intoxication and withdrawal

— Stimulant intoxication (cocaine, methamphetamine — paranoid violent agitation)

— PCP, ketamine, synthetic cathinones ("bath salts"): extreme strength, analgesia, unpredictable violence

— Anabolic steroids: "roid rage"

— Cannabis-induced psychosis in vulnerable individuals

— PTSD: hyperarousal, flashbacks triggering defensive aggression

— Acute stress disorder

— Intermittent explosive disorder: recurrent, out-of-proportion outbursts not better explained by other diagnosis

— Conduct disorder/oppositional defiant disorder: adolescents

— Autism spectrum with aggression: often communication of distress

Primary psychotic disorders:

Mood disorders:

Personality disorders:

Substance use disorders:

Trauma- and stressor-related:

Neurodevelopmental:

Key distinction: Intermittent explosive disorder requires impulsive aggression disproportionate to provocation, recurrent, with distress/impairment, not attributable to another disorder — diagnosis of exclusion. SSRIs first-line; mood stabilizers second.

Board pearl: Postpartum psychosis is a psychiatric emergency with ~4% infanticide risk; mother and infant must be separated, mother hospitalized, regardless of insight or cooperation.

Key Differentials — Medical and Neurologic Causes

— Hyperactive delirium presents with agitation, hallucinations, paranoia

— Causes: infection (UTI, pneumonia, sepsis), metabolic (hyponatremia, hypoglycemia, uremia, hepatic encephalopathy), hypoxia, medication (anticholinergics, steroids, benzos, opioids), withdrawal

— Hyperthyroidism/thyroid storm: tremor, tachycardia, agitation, psychosis

— Hypoglycemia: sweating, confusion, combative behavior

— Cushing syndrome: mood lability, psychosis

— Pheochromocytoma: episodic agitation with hypertension, headache, palpitations

— Traumatic brain injury (especially frontal/orbitofrontal): disinhibition, impulsive aggression

— Stroke (right hemispheric, frontal): emotional lability, aggression

— Dementias: frontotemporal (early aggression), Alzheimer (later), vascular, Lewy body

— Seizure disorders: postictal aggression (confused, brief, non-directed); ictal aggression is rare

— CNS infection: meningitis, encephalitis, neurosyphilis, HIV

— Autoimmune encephalitis: anti-NMDA receptor encephalitis — young woman, psychiatric symptoms, dyskinesias, autonomic instability, seizures; check ovarian teratoma

— Multiple sclerosis, brain tumors (especially frontal)

— Huntington disease: chorea, psychiatric symptoms, irritability

— Wilson disease: young patient, movement disorder, psychiatric symptoms, Kayser-Fleischer rings, low ceruloplasmin

— Heavy metal poisoning (lead, mercury)

— Carbon monoxide

— Hepatic encephalopathy (asterixis, elevated ammonia)

— Porphyria (abdominal pain, neuropsychiatric symptoms)

— Corticosteroid-induced psychosis (dose-related, especially >40 mg prednisone)

— Anticholinergic delirium (atropine, scopolamine, antihistamines)

— Levodopa, dopamine agonists (psychosis, impulse control)

— Interferon (depression, irritability)

Delirium: the single most common medical cause of new agitation in hospitalized patients

Endocrine:

Neurologic:

Toxic/metabolic:

Iatrogenic:

Key distinction: Anti-NMDA receptor encephalitis mimics primary psychosis but features prominent orofacial dyskinesias, autonomic dysfunction, and seizures; check anti-NMDAR antibodies in CSF and screen for ovarian teratoma — a high-yield Step 3 vignette.

Board pearl: New agitation in patient >40 without psychiatric history is medical until proven otherwise — order workup before labeling psychiatric.

Secondary Prevention and Long-Term Risk Reduction

— Medication adherence (long-acting injectable antipsychotics for nonadherent psychotic patients with violence history: paliperidone, aripiprazole, risperidone Consta, haloperidol decanoate)

— Substance use — integrated dual diagnosis treatment, MAT for alcohol (naltrexone, acamprosate) and opioid (buprenorphine, methadone)

— Symptom control — clozapine has unique evidence for reducing aggression and suicidality in schizophrenia

— Sleep, nutrition, structure

— Firearm removal — Extreme Risk Protection Orders (ERPO / "red flag laws") in many states allow temporary removal

— Voluntary safe storage with family or law enforcement

— Counseling and documentation of firearm access discussion

— Knife, medication, vehicle considerations

— Cognitive behavioral therapy for anger/aggression

— Dialectical behavior therapy for borderline PD with affective aggression

— Trauma-focused CBT, EMDR for PTSD-driven aggression

— Schema therapy, mentalization-based therapy for personality disorders

— Anger management programs — best when CBT-based, individualized

— Clozapine — uniquely effective for treatment-resistant schizophrenia with aggression; requires ANC monitoring (REMS)

— Mood stabilizers (lithium, valproate, carbamazepine, oxcarbazepine) for impulsive aggression, IED, bipolar

— SSRIs for IED, irritability in depression/PTSD

— Beta-blockers (propranolol) for TBI-related aggression, akathisia

— Naltrexone for alcohol-driven aggression

— Stable housing (Housing First models)

— Employment support, financial assistance

— Family psychoeducation

— Assertive Community Treatment (ACT) for high-risk patients with frequent crisis utilization

— Mental health courts and forensic diversion programs

Modifiable dynamic risk factors — target these:

Means restriction — critical and often tested:

Therapy modalities with evidence:

Pharmacologic maintenance:

Social and systemic:

Step 3 management: For schizophrenia with multiple violent episodes on oral medication, the next step is long-acting injectable antipsychotic; if still violent despite adequate trials of two antipsychotics, transition to clozapine.

Board pearl: Firearm access discussion and means restriction counseling are standard of care for any patient with violence or suicide risk — documented in chart.

Follow-Up, Monitoring, and Aftercare

— Psychiatry follow-up within 7 days of discharge after violence-related admission (HEDIS quality measure)

— Telephone outreach within 48-72 hours

— Case management/ACT contact for high-risk patients

— Substance use treatment linkage same week

— PCP follow-up within 2-4 weeks for medical comorbidities

— Antipsychotics: weight/BMI, waist circumference q3 months; fasting glucose/HbA1c, lipids at baseline, 12 weeks, then annually; prolactin if symptomatic; ECG for QT-prolonging agents

— Clozapine: ANC weekly × 6 months, biweekly × 6 months, then monthly (REMS); metabolic monitoring; cardiac (myocarditis early, cardiomyopathy late); seizure threshold; constipation/ileus

— Lithium: levels q3-6 months, TSH, BUN/Cr q6-12 months

— Valproate: levels, LFTs, CBC, ammonia if symptomatic

— Carbamazepine: levels, CBC, LFTs, sodium

— Track aggression incidents (MOAS or behavioral logs)

— Family/caregiver check-ins

— Probation/parole coordination if forensic

— Random urine drug screens in substance use comorbidity

— Vocational rehabilitation

— Supported employment

— Anger management, social skills training

— Victim restitution programs where applicable

— Couples/family therapy when intimate partner violence (with safety planning — never joint sessions if active IPV)

— Identify warning signs

— Internal coping strategies

— Social contacts for distraction

— People and professionals to call in crisis

— Means restriction

— Reasons for living/protective factors

— 30-day readmission rate

— 7-day follow-up compliance

— ED utilization

— Treatment adherence rates

Post-discharge follow-up cadence (Step 3 outpatient thinking):

Monitoring parameters on maintenance medications:

Behavioral monitoring:

Rehabilitation and counseling:

Safety planning components:

Quality and value-based care metrics:

Step 3 management: A patient discharged after violence-related psychiatric admission who misses 7-day follow-up — the correct response is active outreach (phone, home visit, ACT team), not waiting passively for next scheduled appointment.

Board pearl: Clozapine is the only antipsychotic with evidence for reducing suicide and aggression independent of psychosis control — but requires lifelong ANC monitoring.

Ethical, Legal, and Patient Safety Considerations

— Originated in California (Tarasoff v. Regents, 1976); now adopted in some form in most US states (varies: duty to warn, duty to protect, permissive disclosure)

— Triggered by serious threat of physical violence against an identifiable victim

— Clinician obligations may include: warning the victim, notifying law enforcement, hospitalizing the patient, intensifying treatment

— Know your state's statute; "no duty" states still permit disclosure

— Document threat assessment, reasoning, and actions

— HIPAA permits disclosure to prevent imminent serious harm (45 CFR 164.512(j))

— Disclose minimum necessary information to appropriate parties

— Inform patient of limits of confidentiality at outset of treatment

— Capacity assessment for treatment refusal is separate from involuntary commitment criteria — a patient can be committed and still refuse non-emergency medications absent a separate court order for involuntary treatment (Rogers hearing in MA, Rivers in NY)

— Emergency medication can be given without consent if imminent danger; document

— Consent for restraint is not required when criteria met (emergency exception)

— Due process requires least restrictive alternative

— Time-limited initial hold; judicial review within statutory window

— Patient retains rights (counsel, communication, refusal of non-emergency treatment)

— Child abuse, elder/dependent adult abuse: mandatory in all states when reasonable suspicion

— Domestic violence: varies by state (mandatory reporting of injuries from weapons; some states mandate IPV reporting, most do not)

— Gunshot/stab wounds: mandatory law enforcement notification in most states

— Impaired drivers: state-specific

— Highest risk for violence and suicide is the first 1-2 weeks post-discharge

— Medication reconciliation, warm handoff to outpatient provider, 48-72 hour phone contact, 7-day appointment all reduce risk

— Communicating risk factors to next provider is essential (releases, structured handoff)

— Workplace violence prevention plans (OSHA guidance, Joint Commission)

— Staff training in de-escalation and restraint

— Incident reporting and root cause analysis

Tarasoff and duty to protect:

Confidentiality limits:

Informed consent edge cases:

Involuntary commitment:

Mandatory reporting:

Transition-of-care safety risks:

Patient safety/system issues:

Step 3 management: A patient threatens to kill a named ex-partner during outpatient visit — your immediate steps are: assess seriousness, attempt voluntary hospitalization, initiate involuntary hold if refused, warn the identified victim, notify law enforcement, document the entire chain of reasoning. Doing nothing or only documenting is the wrong answer.

Board pearl: "Duty to protect" includes more than warning — hospitalization or intensified treatment may discharge the duty without breaking confidentiality.

High-Yield Associations and Rapid-Fire Facts

— Past violence (single strongest)

— Young age, male sex

— Substance use (alcohol, stimulants)

— Antisocial personality, psychopathy

— Access to firearms

— Recent loss/stressor

— Treatment nonadherence

— Stable housing, employment

— Treatment engagement

— Sober support

— Family/social connection

— Reasons for living

— PCP, "bath salts" (synthetic cathinones) → violent, analgesic, hyperthermic agitation

— Methamphetamine → paranoid violent psychosis

— Anabolic steroids → irritable aggression

— Alcohol withdrawal → DTs, agitation, seizures

— Othello syndrome (delusional jealousy) → high homicide risk toward partner

— Postpartum psychosis → infanticide risk ~4%, psychiatric emergency

— Anti-NMDA receptor encephalitis → young woman, psychosis, dyskinesias, teratoma

— Frontotemporal dementia → early disinhibition and aggression

— Lewy body dementia → antipsychotic sensitivity (use quetiapine/pimavanserin)

— Intermittent explosive disorder → SSRI first-line

— Autism with irritability → risperidone or aripiprazole (FDA-approved)

— B-52 = Benadryl 50 mg + Haldol 5 mg + Ativan 2 mg IM

— Never combine IM olanzapine with IM benzodiazepine

— Clozapine uniquely reduces aggression and suicide in schizophrenia

— Propranolol for TBI-related aggression and akathisia

— Haloperidol safest IM in pregnancy

— Tarasoff: duty to protect identifiable victim

— CMS: face-to-face evaluation within 1 hour of violent restraint

— Restraint time limits: 4h adult, 2h ages 9-17, 1h <9

— ERPO ("red flag") laws allow firearm removal

— HEDIS: 7-day post-discharge follow-up

— Inpatient short-term: BVC, DASA

— Forensic long-term: HCR-20, VRAG, PCL-R

— Post-discharge: COVR

Strongest predictors of future violence:

Strongest protective factors:

Drug-specific associations:

Diagnosis-specific high-yield:

Pharmacology pearls:

Legal/regulatory pearls:

Tools by setting:

Board pearl: Imminent quiet calm in a previously agitated patient = pre-attack quieting, not improvement.

Key distinction: Affective/reactive aggression → de-escalate, treat acutely; predatory/instrumental aggression → contain, secure, involve law enforcement.

Board Question Stem Patterns

"A 32-year-old man with schizophrenia tells you during outpatient visit that he plans to kill his neighbor John Smith tonight because he believes Smith is poisoning his food..." → Answer: Hospitalize (voluntary or involuntary) AND warn the identified victim/law enforcement. Distractors: maintain confidentiality, document only, increase medication and reschedule.

"Agitated psychotic patient refuses PO medications, threatening staff..." → Answer: IM haloperidol + lorazepam + diphenhydramine (or IM olanzapine alone). Distractor: IM olanzapine + IM lorazepam (wrong — respiratory depression risk).

"Nursing home patient with Alzheimer dementia becomes aggressive during bathing..." → Answer: Non-pharmacologic interventions first (change caregiver, address pain/toileting, modify environment). If medication needed, low-dose risperidone with mortality counseling.

"After placing a 35-year-old in 4-point restraints for assaulting staff, what is the next required step?" → Answer: Face-to-face physician evaluation within 1 hour and time-limited order (≤4 hours).

"22-year-old woman with subacute psychosis, orofacial dyskinesias, autonomic instability, seizures..." → Answer: CSF anti-NMDA receptor antibodies and pelvic imaging for ovarian teratoma.

"Elderly man with parkinsonism, visual hallucinations, and fluctuating cognition develops severe rigidity after haloperidol..." → Answer: Lewy body dementia; use quetiapine or pimavanserin.

"Day 5 postpartum, mother with delusions that baby is the devil..." → Answer: Immediate hospitalization, separate from infant; psychiatric emergency.

"Which factor most strongly predicts future violence?" → Answer: History of past violence.

"Patient given haloperidol becomes more restless and pacing..." → Answer: Akathisia; treat with propranolol or benztropine, NOT more antipsychotic.

"Discharging patient with recent homicidal ideation, gun at home..." → Answer: Firearm removal/safe storage counseling and documentation; consider ERPO.

"Schizophrenia patient with multiple violent admissions despite trials of risperidone and olanzapine..." → Answer: Clozapine.

Pattern 1 — Tarasoff trigger:

Pattern 2 — Acute agitation choice:

Pattern 3 — Dementia agitation:

Pattern 4 — Restraint regulatory:

Pattern 5 — Anti-NMDA receptor encephalitis:

Pattern 6 — Lewy body sensitivity:

Pattern 7 — Postpartum psychosis:

Pattern 8 — Strongest predictor:

Pattern 9 — Akathisia mimic:

Pattern 10 — Means restriction:

Pattern 11 — Treatment-resistant aggression:

Step 3 management: Look for vignettes that test sequencing — the right answer is rarely the most aggressive option; it's the next least restrictive effective step with proper documentation.

Board pearl: When in doubt, assess capacity, document reasoning, choose least restrictive option that ensures safety, and warn identifiable victims — these four moves cover most stems.

One-Line Recap

Violence risk assessment is a structured, dynamic, documented clinical process combining past history (strongest predictor), current symptoms, access to means, and protective factors to choose the least restrictive intervention that ensures safety of patient, staff, and identifiable third parties.

Predict and stratify: Past violence + substance use + access to weapons + active psychosis with target + treatment nonadherence = highest imminent risk; use structured tools (BVC inpatient, HCR-20 forensic) to augment — never replace — clinical judgment with explicit documentation of dynamic risk factors and protective factors.

Acute management hierarchy: Environmental safety → verbal de-escalation (Project BETA) → offered PO medication (lorazepam, olanzapine ODT) → IM medication (haloperidol + lorazepam + diphenhydramine, or IM olanzapine alone — never IM olanzapine + IM benzo) → seclusion/restraint as last resort with CMS-compliant 1-hour face-to-face evaluation, time-limited orders (4h adult, 2h teen, 1h child), q15min monitoring, and post-event debrief.

Legal and ethical core: Tarasoff duty to protect identifiable victims (warn, hospitalize, or intensify treatment); HIPAA permits disclosure to prevent imminent serious harm; involuntary commitment requires mental illness plus dangerousness plus failure of less restrictive alternatives; capacity for treatment refusal is assessed separately from commitment criteria; firearms means restriction (including ERPO) and 7-day post-discharge follow-up are standard of care.

Special situations: Postpartum psychosis = emergency with infanticide risk; anti-NMDA receptor encephalitis = young woman with psychosis + dyskinesias + teratoma; Lewy body dementia = quetiapine/pimavanserin not haloperidol; pregnancy = haloperidol IM with lateral positioning; treatment-resistant aggression in schizophrenia = clozapine.

Step 3 management: Sequence matters more than aggressiveness — the correct answer is the next least restrictive intervention that ensures safety, paired with thorough documentation of reasoning, capacity, and disposition rationale.