Two Vasoactives, Two Pumps, and an Unlabeled Syringe
Your team is at a level II nursery to transport a 2.6 kg, 12-day-old infant in septic shock. He has dopamine at 10 mcg/kg/min running at 1 mL/hr (1600 mcg/mL) through a 24-gauge IV in the right hand, plus a scalp IV. BP is 48/26. The nursery nurse wants to add epinephrine at 0.05 mcg/kg/min and proposes piggybacking it into the dopamine line through a 3-way stopcock to save pump channels, because your transport pack carries two syringe pumps. She hands your partner a syringe labeled only 'EPI' in marker. The handoff sheet lists 'dopamine 10' with no units. Transport is 70 minutes by ground, and the infant is not intubated.
1. Calculate the current dopamine rate and the proposed epinephrine rate at 10 mcg/mL. What does the arithmetic tell you about the proposed piggyback setup?
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Dopamine: 10 mcg/kg/min x 2.6 kg = 26 mcg/min. At 1600 mcg/mL, that is 0.016 mL/min, which is 0.98 mL/hr - so the existing infusion and the stated rate agree. That check is itself useful; it confirms the current pump is programmed correctly.
Epinephrine: 0.05 mcg/kg/min x 2.6 kg = 0.13 mcg/min. At 10 mcg/mL, that is 0.013 mL/min, or 0.78 mL/hr.
What the arithmetic means:
- Dead space dominates delivery. A stopcock manifold plus extension tubing holds roughly 1.5-3 mL. At 0.78 mL/hr, that represents 2-4 hours of drug before the epinephrine ever reaches the patient - longer than the entire transport. The infant would effectively receive nothing, and the team would conclude the drug was ineffective and escalate the dose without effect.
- The drugs become coupled. A change in the dopamine rate would alter the epinephrine delivery, and every rate change adds another lag.
- They become indistinguishable. In an emergency, two vasoactives sharing one line and one manifold is a line-tracing error waiting to happen.
Conclusion: one dedicated pump channel per vasoactive, shortest possible tubing, stopcock directly at the hub, and verify the pump's minimum deliverable rate and its occlusion-alarm sensitivity at these flows before you leave.
2. Your partner is handed a syringe labeled 'EPI' in marker and a sheet that says 'dopamine 10.' What do you do, and what is the standard for a safe medication handoff here?
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Refuse the syringe. An unlabeled or partially labeled infusion is never accepted, no matter how busy the handoff. You cannot verify what you cannot read.
What must be confirmed, out loud, with the referring nurse and a second person:
- Drug, diluent, and concentration
- Dose in mcg/kg/min, not '10'
- Actual rate and pump programming
- Which line and which lumen
- Time started and when the syringe must be changed
Recompute the rate yourself from the concentration and the weight; do not trust a pump display you did not verify. If the concentration cannot be confirmed by pharmacy or the prescriber, have a new syringe prepared with a proper label before departure, or have the drug replaced if the infant cannot wait. Relabel, double-check, and document the concentration, dose, and rate on the transport record. Then trace every line from pump to patient hub, one at a time, before the wheels move.
3. The scalp IV is positional and the hand IV is the only reliable route. What access decisions do you make before moving, and what is your extravasation plan?
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Risk assessment: a neonate on a high-dose peripheral vasoactive with exactly one reliable line, being moved into a confined space where the hand is hard to watch, is the highest-risk access scenario in neonatal transport.
Before departure:
- Secure the existing line with a clear dressing positioned so the site can be inspected without undressing the hand, and inspect it hourly en route.
- Attempt one additional site with a time limit - antecubital is preferable to scalp, which is harder to monitor and easier to extravasate unnoticed.
- If no second site is obtainable, place an intraosseous line while at the referring hospital. Do not plan to place an IO in a moving vehicle if the line fails.
- Umbilical access is not an option at 12 days.
Extravasation plan: stop the infusion, do not flush, aspirate back, elevate the limb, and infiltrate phentolamine 0.1-0.2 mg/kg diluted in 1-2 mL of saline into the site (per local protocol), ideally within 12 hours. Have the phentolamine drawn up before you move. Watch for compartment syndrome - a tense, cold, painful limb needs surgical evaluation. Restart the vasoactive through the other line, and document the site, drug, concentration, time, and intervention.