A Ten-Fold Insulin Error at 02:10 on a Short-Staffed Ward
It is 02:10 on a 28-bed medical ward. You are the only registered nurse, working with one healthcare assistant, caring for 12 patients. While checking the electronic medication record you realise that at 22:00 you gave 10 units of insulin aspart to Bed 12 instead of the prescribed 4 units; the 10-unit chart belonged to Bed 14, who has a similar surname. Bed 12 is 70 years old with type 2 diabetes and an eGFR of 38; his capillary glucose was 6.1 mmol/L at midnight and is 4.8 mmol/L now. He is awake, asymptomatic, and has no IV access. Two IV antibiotics are due at 02:30 for other patients. You have told no one. The healthcare assistant says, "If you write that in the notes, you'll be finished."
1. What are your immediate clinical actions for Bed 12, in order?
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Patient first - the paperwork can wait fifteen minutes.
- Recheck capillary glucose now and establish a monitoring interval of every 30–60 minutes. Insulin aspart peaks at roughly 1–3 hours; at 02:00 he is at 4.8 mmol/L and falling, with 10 units on board (2.5 times the intended dose), so the nadir is still ahead.
- Anticipate and prepare for hypoglycaemia. Keep 15–20 g of fast-acting oral carbohydrate at the bedside (glucose gel, juice) and give it if glucose falls below 4.0 mmol/L or he becomes symptomatic, then recheck in 15 minutes and repeat as needed, followed by a longer-acting carbohydrate snack. If he becomes drowsy or cannot swallow, treat as severe hypoglycaemia: call for help and give IV glucose (e.g. 10% glucose 150–200 mL or per protocol) - note he has no IV access, so obtaining a cannula or glucagon must be prepared in advance.
- Assess for symptoms and contributing factors - sweating, tremor, confusion, hunger, palpitations; note that beta-blockade or autonomic neuropathy can blunt warning signs, and reduced eGFR slows insulin clearance, prolonging the risk.
- Inform the nurse in charge/medical team and the covering doctor that a dose error has occurred, so a plan (glucose targets, monitoring frequency, IV access) is agreed and documented.
- If any sign of neuroglycopenia appears, treat first and document afterwards.
Do not give a "correcting" dose of anything, do not delay glucose monitoring to complete the drug round, and do not leave him unobserved in a side room.
2. What do you do about disclosure and reporting - to the patient, the prescriber, and the record?
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To the patient:
- Tell him, honestly and promptly, in plain language once he is clinically stable: "You were given a higher dose of insulin than prescribed at 10 pm. That can make your blood sugar drop, so we are checking it closely. You have not been harmed so far, and here is what we are doing."
- An open disclosure conversation is an ethical and professional obligation and is not an admission of legal liability. Answer what you can, do not speculate or blame others, and offer that the doctor will also speak with him.
- Apologise for the error, not for the system: "I'm sorry this happened."
To the prescriber and team:
- Inform the covering doctor and the nurse in charge immediately; document their advice. Hand over formally at shift change.
In the record:
- Document the facts in the clinical notes: the dose given, the dose prescribed, the time, the glucose readings, the treatment given, the clinicians notified, and the patient's response. The record must be contemporaneous and factual; never backdate, alter or omit.
- Complete a formal incident report through the hospital reporting system the same shift, describing what happened and the contributing factors. The incident report is a quality-improvement document and is not referenced in, or filed with, the clinical notes.
- Expect a root cause analysis / review and cooperate fully.
Why this matters: the alternative - staying silent and hoping glucose stays up - converts a correctable error into concealment, which is the part that ends careers and, more importantly, harms patients. The insulin error is a system and individual failure; the concealment would be a pure individual failure.
3. The healthcare assistant urges you to stay quiet, and you also have two IV antibiotics due at 02:30. How do you manage the situation, the workload, and the conversation with your colleague?
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Immediate leadership decisions:
- Do not accept the advice to stay silent, but do not humiliate the assistant either. A short, firm reply works: "I understand why you said that, but he needs watching tonight and it has to be recorded. I'd rather be disciplined for a mistake than for hiding one."
- Re-prioritise openly. Glucose monitoring for Bed 12 comes before routine antibiotics. The antibiotics due at 02:30 are time-sensitive but not more urgent than a patient at risk of hypoglycaemia - notify the nurse in charge so cover can be arranged, and document any delay. If there is genuinely no cover, escalate to the night nursing supervisor; a staffing shortfall is a management problem that must be named, not absorbed silently.
- Assign the assistant a defined task with a clear boundary: observation and prompt summoning, not clinical decision-making - for example, sit with Bed 12 while you draw up carbohydrate/obtain IV access, and call you immediately if he becomes sweaty, confused or drowsy.
- Call for additional help if the glucose drops below 4.0 mmol/L or he develops any neuroglycopenic sign.
Contributing factors to raise in the review (system, not excuse):
- Two patients with similar surnames in adjacent beds and a shared drug round.
- One registered nurse for 12 patients with a single assistant on a night shift.
- A drug round interrupted at 22:00 and completed under time pressure.
- No independent second-check for insulin, which is a high-alert medication.
Proposed safeguards: barcode scanning or two-nurse check for insulin, surname alerts on the eMAR, cohorting patients with similar names apart, and a protected drug round. Report these through the incident system - that is how a single nurse's error becomes a system fix.