Agitated Overdose with a Narrowing Airway
A 24-year-old woman is brought in by friends at 02:00 after ingesting an unknown quantity of an antidepressant and alcohol at a party. She is agitated, combative, and yelling. Vitals: HR 132 and irregular, BP 156/94, RR 26, SpO2 94% on room air, T 38.2 C, pupils dilated. She is sweating profusely and her skin is hot and dry. She intermittently clutches her chest and reports 'my heart is jumping.' She will not tolerate a nasal cannula or allow an IV. Security is one officer, the department is at full capacity, and two nurses are on shift. Her friends say she takes 'some pill for depression' but do not know the name.
1. Differentiate the likely toxidrome and identify the immediate life threats. What is your first priority given she is refusing interventions?
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Likely toxidrome: anticholinergic/serotonergic overlap with sympathomimetic features. Dilated pupils, hot dry flushed skin, agitation, tachycardia, and hyperthermia fit an anticholinergic picture; the irregular pulse, hyperreflexia-like agitation, and reported 'heart jumping' raise concern for a serotonergic component and arrhythmia. Alcohol confounds sedation and airway risk.
Immediate life threats, ranked:
- Airway and aspiration - decreasing consciousness plus combativeness plus possible co-ingestants means she can lose her airway abruptly.
- Arrhythmia - irregular tachycardia at 132 with possible QT prolongation from a tricyclic or other antidepressant; torsades or wide-complex rhythm is the feared event.
- Hyperthermia - 38.2 C with agitation and sweating can escalate to severe hyperthermia and rhabdomyolysis.
- Agitation-driven harm - to herself and staff.
First priority: safety and airway, not the IV. Move her to a monitored resuscitation space with a clear exit, remove ligature and sharp hazards, and use verbal de-escalation with a calm single speaker. Do not wrestle for an IV while she is combative; instead:
- Apply continuous cardiac monitoring and pulse oximetry noninvasively if she tolerates it.
- Position her semi-upright and suction-ready.
- Call for additional staff and the physician before any restraint decision.
- Treat hyperthermia with cooling and encourage oral fluids only if airway is protected.
- Once she is calmer or if her mental status declines, place the IV and obtain an ECG, glucose, electrolytes, and a tox screen.
Document capacity and refusal carefully; a patient with altered mental status from intoxication generally lacks capacity, which supports necessary treatment under emergency doctrine per policy.
2. Her ECG shows a QTc of 520 ms and a run of wide-complex tachycardia that resolves spontaneously. She then becomes drowsy. Outline your management sequence and the monitoring disposition.
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Interpretation: QTc 520 ms plus a transient wide-complex run in a suspected antidepressant overdose is a high-risk arrhythmia signal. New drowsiness means the airway is now the dominant problem.
Sequence:
- Airway first: reposition, suction, apply supplemental oxygen, and prepare for bag-mask ventilation and intubation. Do not wait for respiratory failure to declare itself.
- IV access now justified: declining consciousness makes access both clinically necessary and easier; draw glucose, electrolytes including magnesium and potassium, renal function, and a 12-lead ECG.
- Treat the QT: correct hypokalemia and hypomagnesemia; give sodium bicarbonate per physician order if a tricyclic or sodium-channel blockade is suspected; avoid drugs that prolong QT.
- Continuous monitoring with defibrillation and pacing capability at the bedside; treat torsades per protocol (magnesium, overdrive pacing, or defibrillation if unstable).
- Temperature and muscle: monitor for hyperthermia and rhabdomyolysis; check CK and urine output.
- Consult toxicology and poison control early for the specific agent and antidote guidance.
Disposition: admit to a monitored bed (ICU or step-down with continuous ECG), not a psychiatric unit. She needs serial ECGs, electrolyte correction, and observation for delayed arrhythmia. Psychiatric evaluation occurs only after medical stabilization and return of normal mentation.