The Toddler Who Ate Grandpa's Pills
A 3-year-old, 14 kg, is brought 90 minutes after being found with an open bottle of an unknown 'heart pill.' The parents bring a bottle labeled metoprolol tartrate 50 mg; an unknown number are missing. The child is drowsy but arousable, HR 62, BP 74/40, RR 18, SpO2 99%, glucose 88 mg/dL, temp 36.4 C. Capillary refill is 3 seconds, extremities cool. ECG shows sinus bradycardia with a PR interval at the upper limit of normal and no wide QRS. The child has vomited once en route. IV access is established. The local poison center is on hold and the on-call pharmacist is off-site.
1. What is your immediate pharmacologic sequence for this beta-blocker overdose, and how do you decide when to escalate?
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This is a symptomatic beta-blocker overdose with bradycardia and hypotension - treat the patient, not the number.
Immediate sequence:
- Airway/breathing and continuous cardiac monitoring; keep IV access.
- Atropine for symptomatic bradycardia (0.02 mg/kg IV, ~0.3 mg; minimum ~0.1 mg to avoid paradoxical bradycardia).
- IV fluid bolus (10–20 mL/kg) for hypotension, reassessing for pulmonary edema.
- Glucagon if atropine/fluids insufficient: 0.05–0.1 mg/kg IV (up to ~1–5 mg), an antidotal therapy that bypasses the beta receptor via cAMP.
- High-dose insulin with dextrose (hyperinsulinemia-euglycemia) for refractory cardiogenic shock, with frequent glucose monitoring.
- Vasopressors (e.g., norepinephrine/epinephrine infusion) for refractory hypotension; consider calcium and, in extremis, pacing or ECMO consultation.
Escalation logic: step up when there is inadequate perfusion (mental status, cap refill, urine output, lactate) or hemodynamic instability refractory to the prior step, not merely because the heart rate is low. A bradycardic child who is perfusing well may need only monitoring.
Judgment point: recognizing glucagon and high-dose insulin as antidotal therapies, and titrating to perfusion endpoints.
2. The poison center is on hold and no pharmacist is available. How do you manage the information gap and the decontamination decision?
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Information gap:
- Do not delay stabilization for a phone consult; treat the symptomatic child now.
- Attempt repeat poison-center contact and document the times; use institutional references/formulary for dosing.
- Call back the pharmacist or use an on-call clinical pharmacology resource; if unavailable, use a second clinician to verify doses (closed-loop communication).
- Document the uncertainty and the plan explicitly.
Decontamination decision:
- Activated charcoal: consider a single dose (1 g/kg, ~14 g) if the child is alert with a protected airway, presents within ~1–2 h, and the ingestion is potentially toxic. This child is drowsy, has vomited, and has a sustained-release vs immediate-release ambiguity (label says tartrate, but confirm) - airway protection is the gating factor. If mental status is depressed, do not give charcoal without securing the airway.
- Gastric lavage is generally not indicated and carries aspiration risk.
- Whole-bowel irrigation is not routine for this ingestion.
Judgment point: the exam tests airway-first decontamination reasoning and managing a system failure (unavailable consultants) without compromising care or skipping verification.