Medication Error Prevention with High-Alert Medications in a Busy Hospital Ward
A 70-year-old woman with heart failure and atrial fibrillation is admitted to a general medical ward. Her medications include digoxin 0.25 mg daily, warfarin 5 mg daily, and furosemide 40 mg daily. During a shift change, a nurse discovers that the patient received two doses of digoxin 0.25 mg within 2 hours due to a communication error. The patient's digoxin level is 2.8 ng/mL (therapeutic 0.5–2.0). She reports nausea and visual changes. The pharmacy team must manage the overdose and implement system changes to prevent recurrence.
1. Describe the immediate management of digoxin toxicity in this patient and the role of digoxin-specific antibody fragments.
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Assess severity: nausea, visual disturbances, and level 2.8 ng/mL indicate toxicity. Obtain ECG (look for bradycardia, heart block, arrhythmias), electrolytes (potassium, magnesium, renal function). Hold digoxin and correct contributing factors (hypokalemia, hypomagnesemia, renal impairment). For life-threatening arrhythmias or hyperkalemia (>5.5 mEq/L), administer digoxin immune Fab (DigiFab). Dosing: empiric 10–20 vials for acute overdose; or calculate based on level and weight: number of vials = (digoxin level ng/mL × weight kg) / 100, rounded up. For chronic toxicity, lower doses may suffice. Monitor potassium; avoid calcium. Provide supportive care. In this case, with stable vitals but symptoms, consider Fab if arrhythmias or worsening. Otherwise, monitor and hold digoxin. Pharmacist should review all medications for interactions (e.g., amiodarone, verapamil).
2. What system-based strategies would you recommend to prevent high-alert medication errors like this in the future?
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Implement a high-alert medication policy: independent double-check for digoxin, warfarin, and insulin before administration. Use barcode medication administration (BCMA) to verify patient and drug. Standardize digoxin order sets with clear dose and indication. Improve shift handoff communication using SBAR. Provide education to nursing staff on digoxin toxicity signs. Conduct a root cause analysis of the incident. Consider automated dispensing cabinets with profile restrictions. Encourage reporting through the hospital's pharmacovigilance system without blame. The pharmacist should lead medication reconciliation on admission and discharge, and participate in safety huddles. Ensure adequate staffing and reduce interruptions during medication preparation.