Residency · Residency · Emergency Medicine

Acute Agitation: De-escalation and Chemical Sedation

Introduction

Acute agitation is a common and challenging presentation in the emergency department, occurring in an estimated 2 to 3 percent of all ED visits. Agitated patients pose a risk of harm to themselves, staff, and other patients, and the undifferentiated agitated patient may have a life-threatening medical etiology. The emergency physician must balance the imperative of rapid behavioral control with the obligation to identify and treat underlying causes. A structured approach emphasizing verbal de-escalation first, followed by appropriate pharmacological intervention when necessary, optimizes both patient and staff safety.

Etiology of Acute Agitation

Medical Causes (Must Be Excluded)

Hypoglycemia is the most rapidly reversible cause and warrants an immediate point-of-care glucose check. Other medical causes include hypoxia (from pneumonia, PE, or airway obstruction), CNS infection (meningitis, encephalitis), head injury (traumatic intracranial hemorrhage), toxic ingestion (sympathomimetics such as methamphetamine, cocaine, and synthetic cathinones, as well as anticholinergics, PCP, serotonin syndrome, and NMS), metabolic derangements (hyponatremia, hepatic encephalopathy, uremia, thyrotoxicosis), alcohol or sedative withdrawal (delirium tremens, benzodiazepine withdrawal), and postictal confusion and agitation following seizure.

Psychiatric Causes

Psychiatric etiologies include acute psychosis from schizophrenia, schizoaffective disorder, or bipolar mania, severe anxiety or panic, PTSD-related dissociation, and personality disorders with behavioral dysregulation.

Substance-Related Causes

Acute intoxication with alcohol, methamphetamine, cocaine, PCP, synthetic cannabinoids, or bath salts (synthetic cathinones) is a common cause. Withdrawal from alcohol, benzodiazepines, or opioids can also produce significant agitation.

Initial Assessment -- Rapid Safety Screen

Scene safety must be ensured first by having adequate staff present, clearing exits, removing potential weapons from the environment, and lowering stimulation including lights and noise. Vital signs should be obtained as soon as safely possible, as tachycardia, hyperthermia, and hypertension suggest a medical or toxicological etiology. Point-of-care glucose should be checked immediately, and hypoglycemia treated with IV dextrose. A rapid neurological assessment evaluates pupil size and reactivity, focal deficits, and signs of head trauma. The agitation should be categorized as cooperative (amenable to verbal redirection), agitated but redirectable, or severely agitated and combative (requiring immediate pharmacological intervention). A validated agitation scale such as the RASS (Richmond Agitation-Sedation Scale) or BARS (Behavioral Activity Rating Scale) should be used to track response to interventions.

<image>Emergency department agitation management flowchart showing initial rapid safety assessment, point-of-care glucose check, vital sign screening, and three-tiered intervention approach: verbal de-escalation for mild agitation, oral medications for moderate agitation, and parenteral sedation for severe agitation, with medication options and dosing at each tier</image>

Verbal De-escalation

Verbal de-escalation should be attempted in all patients before pharmacological intervention unless the patient is immediately dangerous. It is effective in up to 70 to 80 percent of agitated patients. The AAEP/ACEP recommended techniques include respecting personal space by maintaining at least two arm lengths distance and positioning at a slight angle rather than face-to-face, avoiding provocative language, commands, threats, or arguments, and not touching the patient without permission. The clinician should establish verbal contact by introducing themselves calmly, using the patient's name, and speaking in a low, steady, slow voice with concise language using short, simple sentences. Identifying wants and feelings with statements like "I can see you're upset. What do you need right now?" and listening actively without interruption allows the patient to express their concerns. Finding points of agreement, avoiding power struggles, offering choices and optimism, and setting clear limits calmly in terms of patient safety are all important techniques. After the event, the team and patient should be debriefed.

Pharmacological Management

Principles

The agent should be chosen based on the suspected etiology of agitation. The goal is calm cooperation, not unconsciousness, as oversedation increases risks of aspiration, respiratory depression, and missed diagnoses. Oral medications are preferred when the patient can be safely redirected to accept them, as they are as effective as IM medications for moderate agitation. IM medications are appropriate when the patient refuses oral medications or is too agitated for oral administration. IV medications offer the fastest onset and most precise titration but require vascular access, which may be difficult in combative patients.

Benzodiazepines

Benzodiazepines are preferred for alcohol and sedative withdrawal, stimulant intoxication (cocaine, methamphetamine), seizure-related agitation, and undifferentiated agitation. Lorazepam is dosed at 1 to 2 mg PO/IM/IV with an IM onset of 15 to 30 minutes and IV onset of 2 to 5 minutes, and may be repeated every 15 to 30 minutes. Midazolam at 2.5 to 5 mg IM or 1 to 2.5 mg IV has the fastest IM onset at 5 to 15 minutes and is the preferred IM benzodiazepine. Diazepam at 5 to 10 mg PO/IV should not be given IM due to erratic absorption. Advantages include effectiveness across most etiologies, reversibility with flumazenil, and the ability to treat withdrawal and seizures. Disadvantages include respiratory depression (especially with alcohol co-ingestion), paradoxical disinhibition in some patients, and less effectiveness for psychotic agitation alone.

Antipsychotics

Antipsychotics are preferred for primary psychotic agitation, delirium (non-alcohol-withdrawal), and agitation without seizure risk. Haloperidol at 5 to 10 mg IM (2 to 5 mg in elderly patients) has an onset of 20 to 40 minutes IM and can be combined with a benzodiazepine and diphenhydramine in the "B52" combination: Benadryl 50 mg plus haloperidol 5 mg plus lorazepam 2 mg IM. Droperidol at 2.5 to 5 mg IM/IV has an onset of 5 to 10 minutes and is faster and possibly more effective than haloperidol; the 2001 black box warning for QTc prolongation is clinically insignificant at standard doses and should not prevent its appropriate use. Olanzapine at 10 mg IM has an onset of 15 to 30 minutes with a favorable side-effect profile, but it must not be administered within 1 hour of parenteral benzodiazepines due to the risk of severe respiratory depression and death. Ziprasidone at 10 to 20 mg IM has an onset of 15 to 30 minutes and is effective for psychotic agitation. Risks of antipsychotics include QTc prolongation (an ECG should be obtained when possible, especially with IV haloperidol), extrapyramidal symptoms (treated with diphenhydramine 50 mg or benztropine 1 to 2 mg), and neuroleptic malignant syndrome (rare).

Ketamine

Ketamine is preferred for severe agitation requiring immediate control, particularly combative, undifferentiated agitation unresponsive to other agents. The dose is 4 to 5 mg/kg IM or 1 to 2 mg/kg IV, with an IM onset of 2 to 5 minutes, making it the fastest IM onset of any agent. It provides dissociative sedation while maintaining airway reflexes and respiratory drive. Risks include laryngospasm (rare), emergence reactions (mitigated with midazolam 0.1 mg/kg), hypersalivation, and transient hypertension. Ketamine is increasingly used as a first-line agent for severe undifferentiated agitation in both prehospital and ED settings.

<image>Comparison chart of chemical sedation agents for acute agitation showing five columns for midazolam, haloperidol, droperidol, olanzapine, and ketamine, with rows for route of administration, onset time, typical dose, mechanism of action, advantages, disadvantages, and special considerations, using color-coding for preferred etiology</image>

Physical Restraints

Physical restraints are used when immediate safety is at risk and pharmacological intervention has not yet taken effect. They must always be combined with pharmacological sedation, as restraints alone are never the definitive treatment. Four-point soft restraints are applied with the patient supine, with one arm up and one arm down to allow lateral positioning for airway protection. Monitoring includes continuous pulse oximetry, cardiac monitoring, and checks of restraint tightness and neurovascular status every 15 minutes, with reassessment of the need for restraints every 1 to 2 hours. The indication, time of application, and reassessment findings should be documented. Restraints carry risks including positional asphyxia, rhabdomyolysis, aspiration, skin breakdown, and psychological trauma.

Post-Sedation Management

Continuous monitoring with pulse oximetry, cardiac monitoring, and capnography (if available) is essential. Vital signs, level of sedation (using RASS), airway integrity, and response to medications should be reassessed every 15 to 30 minutes. Once the patient is safely sedated, the underlying cause should be investigated with laboratories (glucose, BMP, CBC, lactate, toxicology screen, ethanol level), ECG, and CT of the head if there is trauma, focal deficits, or unexplained altered mental status. Medical causes require admission, primary psychiatric etiologies warrant psychiatric evaluation, and substance-related agitation may be appropriate for ED observation and discharge once the patient is sober and safe.

Clinical Pearls

Always check blood glucose immediately in any agitated patient, as hypoglycemia is the most rapidly reversible cause of agitation. Verbal de-escalation is effective in the majority of agitated patients and should always be attempted before pharmacological intervention. Droperidol has the fastest onset and highest efficacy of the traditional antipsychotics for agitation, and the black box warning should not prevent its appropriate use. IM olanzapine must never be combined with parenteral benzodiazepines due to the risk of fatal respiratory depression. Ketamine IM is the fastest-acting agent for severe undifferentiated agitation when immediate control is essential for safety.

References

1. Richmond JS, Berlin JS, Fishkind AB, et al. Verbal de-escalation of the agitated patient: consensus statement of the American Association for Emergency Psychiatry Project BETA De-escalation Workgroup. West J Emerg Med. 2012;13(1):17-25.
2. Mankowitz SL, Regenberg P, Kaldan J, et al. Ketamine for rapid sedation of agitated patients in the prehospital and emergency department settings: a systematic review and proportional meta-analysis. J Emerg Med. 2018;55(5):670-681.
3. Calver L, Drinkwater V, Isbister GK. A prospective study of high dose sedation for rapid tranquilisation of acute behavioural disturbance in an acute mental health unit. BMC Psychiatry. 2013;13:225.
4. Wilson MP, Pepper D, Currier GW, et al. The psychopharmacology of agitation: consensus statement of the American Association for Emergency Psychiatry Project BETA Psychopharmacology Workgroup. West J Emerg Med. 2012;13(1):26-34.

Read this lecture as Markdown