Vasopressor and inotrope infusions: line, pump, titrating to a goal, extravasation and never flushing the line
- Safe practice
Vasopressors and inotropes run on their own line, on a smart pump, titrated to a goal the team sets; the line is never flushed and the site is watched.
What it is
Vasopressors raise blood pressure by tightening the blood vessels; inotropes make the heart pump more strongly. Both are high-alert medicines given as continuous infusions in the ICU, and small changes in flow cause large changes in blood pressure. The nurse checks the order and the standard concentration, programs a smart pump from its drug library, gives the infusion through a dedicated line, titrates to the goal the team wrote (for example a MAP target), watches the patient and the site, and changes syringes or bags without a gap. Vasopressors can be started in a large peripheral vein when waiting for a central line would delay them, but the site needs close watching. This page has no doses: the arithmetic of concentrations and rates is on the calculation pages, and the drugs on their Pharmacology pages.
What it requires
- A written goal (MAP or another target) and titration limits from the medical team.
- A standard concentration and an independent double check where the institution requires it for high-alert medicines.
- A dedicated lumen or line and a smart pump with the drug library; the line is identified as the institutional protocol says.
- Continuous ECG and, ideally, invasive arterial pressure; the Surviving Sepsis Campaign suggests an arterial line as soon as practical.
How it is applied (and why)
- Check the order: drug, concentration, goal and titration limits; ask if any is missing — titrating without a goal is unsafe.
- Do the independent double check and program the pump from the drug library — it blocks many programming errors.
- Use a dedicated line or lumen, identified as the institutional protocol says — other drugs or flushes in the same line push the vasoactive drug in as a bolus.
- Peripheral line: forearm vein, catheter 20 G or larger, blood return before starting — distal and poorly placed catheters extravasate more.
- Check the peripheral site hourly for pain, swelling, redness or coldness and record it — early extravasation is easy to miss.
- Titrate in small steps, wait for the effect and check the arterial pressure and perfusion — the drugs act fast but not instantly.
- Prepare the next syringe or bag before the current one runs out, and change it the way the protocol says — gaps and double doses cause swings in pressure.
- Never flush, bolus or pause the line — the drug in the tubing goes in at once and the pressure swings.
- Watch for arrhythmias, chest pain, cold pale fingers or toes and low urine output — the drugs can cause arrhythmias and too much vasoconstriction.
- Wean as ordered, in small steps, and recheck the pressure after each change — the drugs act fast, in both directions.
In nursing practice
- Peripheral infusions are kept short; the evidence summary for nurses suggests about 24 hours or less, and a central line when the need continues.
- Do not run a vasopressor in the same limb as a blood pressure cuff, over a joint, or in a swollen, infected or burned area.
- If doubts about the infusion arise (an occluded line, a pump alarm), the patient may receive too little drug: check the line from the pump to the vein.
- Hand off the drug, the rate, the goal, the last titration and the state of the site at every change of shift.
- Before an inotrope is started, the team usually corrects hypovolaemia; report signs that the patient is still dry.
Common mistakes
- Flushing the vasopressor line after giving another drug through it.
- Running other infusions or taking blood from the vasopressor lumen.
- Letting the syringe run empty before preparing the next one.
- Titrating to the blood pressure alone while the perfusion signs worsen.
- Checking a peripheral vasopressor site only at the start of the shift.
Test yourself
Think of the answer, then tap the question to see it.
Why is a vasopressor line never flushed?
Flushing pushes the drug in the tubing into the patient all at once, which can cause a sudden rise in blood pressure.
How often is a peripheral vasopressor site checked?
At least hourly, with the findings recorded, because extravasation can cause serious tissue injury.
What are the first steps when a vasopressor extravasates?
Stop the infusion, aspirate what remains, remove the catheter, mark the area, raise the limb and call; the antidote follows the protocol.
Can a vasopressor be started before a central line is in place?
Yes. The Surviving Sepsis Campaign suggests starting it in a large peripheral vein rather than delaying, with close watching of the site.
Elsewhere in DurgiPedia
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In Pharmacology3
Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.
Sources: Summary of best evidence for safe management of vasopressors through peripheral intravenous catheters (Chen G et al., BMC Nursing 2025;24:1000) (BMC Nursing, open access in PubMed Central, 2025); Changeovers of vasoactive drug infusion pumps: impact of a quality improvement program (Argaud L et al., Crit Care 2007;11(6):R133) (Critical Care, open access in PubMed Central, 2007); Feasibility and Safety of Peripheral Intravenous Administration of Vasopressor Agents in Resource-limited Settings (Padmanaban A et al., J Crit Care Med 2020;6(4):210-216) (The Journal of Critical Care Medicine, open access in PubMed Central, 2020); Surviving Sepsis Campaign: international guidelines for management of sepsis and septic shock 2021 (Evans L et al., Intensive Care Med 2021;47:1181-1247) (Society of Critical Care Medicine and European Society of Intensive Care Medicine, open access in PubMed Central, 2021).
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Representative model, for educational purposes only.