The Agitated Patient in a Crowded Resus: Sedation or Restraint?
A 34-year-old man is brought in by police at 01:00 after being found agitated and confused on a street. He is shouting, pacing, and pulling at his clothes. He has a laceration to his forehead. He is sweating profusely, his pupils are dilated, and his temperature is 39.1°C. HR 128, BP 156/92, SpO2 97% on room air. He will not allow examination. He has no identification and no known history. The resus bay is shared with a stable patient; two security staff are present. The nurse asks whether to give IM olanzapine or ketamine to settle him.
1. What is your immediate approach to this patient's agitation, and why is the choice of sedative not the first decision?
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The first decision is safety and diagnosis, not drug choice.
Immediate approach:
- Scene safety and team structure. Ensure adequate staff (security plus clinical staff), clear the shared resus bay of the stable patient if possible, and designate a team leader and a plan for physical restraint if needed.
- Recognise the medical emergency. This is not simply 'agitation'. The combination of hyperthermia (39.1°C), profuse sweating, dilated pupils, tachycardia, hypertension, and confusion suggests a toxidrome - most likely sympathomimetic (e.g. cocaine, amphetamine, or a synthetic cathinone) or serotonin syndrome, or anticholinergic toxicity. Neuroleptic malignant syndrome is also possible. Excited delirium / hyperactive delirium is a life-threatening state with a risk of sudden cardiac arrest, particularly with physical restraint.
- Do not give a sedative before considering the cause. Olanzapine can worsen anticholinergic toxicity, lower the seizure threshold, and cause QT prolongation. Ketamine can worsen sympathomimetic tachycardia and hypertension. The choice depends on the suspected toxidrome.
- Get help and monitor. Apply continuous cardiac monitoring, pulse oximetry, and a blood pressure cuff; obtain IV access if possible; check a capillary glucose; and prepare for rapid deterioration.
Key point: The patient's agitation is a symptom of a medical emergency. The priority is to identify and treat the cause while keeping the patient and staff safe.
2. The patient becomes more agitated and attempts to leave. What is your plan for chemical sedation, and how do you justify it?
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Plan for chemical sedation
Indication: Imminent risk of harm to himself or others, and failure of verbal de-escalation and environmental measures. This is a emergency situation, and sedation is justified to allow assessment and treatment.
Choice of agent - reasoned, not reflexive:
- If a sympathomimetic toxidrome is suspected (dilated pupils, sweating, tachycardia, hypertension, hyperthermia): benzodiazepines are first-line (e.g. titrated IV diazepam or midazolam, or IM midazolam if no IV access). They treat the underlying catecholamine surge and reduce the risk of arrhythmia and hyperthermia. Avoid antipsychotics as first-line because of QT prolongation and the risk of lowering the seizure threshold.
- If an anticholinergic toxidrome is suspected (dry skin, flushing, urinary retention, mydriasis): physostigmine may be considered in specialist hands, but benzodiazepines are still used for agitation; avoid antipsychotics.
- Ketamine can be used for rapid control if immediate sedation is required, but it may worsen tachycardia and hypertension; use with caution and at a lower dose.
- Olanzapine is reasonable for undifferentiated agitation without features of sympathomimetic or anticholinergic toxicity, but not as a first choice here.
Monitoring and aftercare: Continuous cardiac monitoring, pulse oximetry, temperature monitoring, IV access, and preparation for airway support. Reassess the diagnosis once sedated - glucose, ECG, blood gas, and toxicology screens as indicated.
Documentation: Record the indication, the agent and dose, the monitoring, and the reasoning for the choice.