Burning Arm at 12 Seconds: IV Contrast Extravasation in an Outpatient
An 81 kg outpatient comes for CT abdomen/pelvis with IV contrast. She reports that her veins "collapse" and has had four cannulation attempts in the past week. A 22-gauge catheter is placed in the right antecubital fossa with sluggish but present blood return. The order is for 100 mL of iodinated contrast at 3 mL/s. Twelve seconds into the injection the patient grimaces and says her arm feels "tight and burning." The site is visibly swollen by about 2 cm, and the injector has not reached its pressure limit. Last month's eGFR was 52. The technologist is alone at the console and the radiologist is reading in another room.
1. What do you do in the first 30 seconds, and roughly how much contrast do you assume entered the soft tissues?
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Stop the injection first, then think. Hit the injector stop/abort button before anything else - every additional second adds roughly 3 mL of extravasated contrast.
Estimate the volume. 12 s × 3 mL/s ≈ 36 mL delivered, and some fraction of that is in the tissues. Record the number; it drives later decisions and documentation.
Do not flush the line, massage the site, or re-use that catheter.
Then:
- Notify the radiologist immediately (this is a reportable event, not a tech-to-tech fix).
- Remove the catheter per department protocol, elevate the arm above heart level.
- Apply cold compresses for the first 24 hours (some protocols use warm after 24 h).
- Assess neurovascular status: capillary refill, radial pulse, color, sensation, pain out of proportion, and mark the margin of swelling with a pen and measure it.
- Document time, volume, contrast agent and concentration, gauge, site, symptoms, and interventions in the RIS and file an incident report.
Escalation triggers: blistering, skin breakdown, progressive swelling, numbness, or pain disproportionate to the volume → same-day surgical/ED evaluation for possible compartment syndrome. Extravasation of this volume is usually managed conservatively, but the judgment call is recognizing the small subset that is not.
2. The images are nondiagnostic for the liver lesion. The referring clinician calls and asks you to "just re-shoot it" this afternoon. How do you handle that request?
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You do not automatically re-inject the same arm, and you do not take the order from the referrer.
Reasoning chain:
- Re-puncturing an extremity that just received ~36 mL of extravasated contrast risks compounding tissue injury and is a radiologist-level decision, not a scheduling decision.
- A re-injection today is possible if there is a good alternative site - a larger bore (20–22 G) in the opposite arm or a forearm vein, ideally confirmed with a test flush - but a 22 G peripheral line running at 3 mL/s is already at the high end for that gauge, and the same failure mode may recur.
- Options to weigh, roughly in order: (a) rescan later the same day via a different, larger access site with the radiologist's approval; (b) delay 24–48 h to let the arm settle; (c) change route - power-injected central line if one exists; (d) change modality or defer, depending on the clinical question.
- Ask the referrer one question: what decision changes based on this answer today? If the lesion is being characterized for an elective workup, delay costs nothing. If there is an acute complication, the calculus changes and you escalate to the radiologist for a risk/benefit call.
The incorrect move is treating "re-shoot it" as an order you must fill, or silently rescheduling without telling the radiologist the study was nondiagnostic.
3. The patient is discharged from the department. What must be communicated, and by whom?
Read the worked answer
Documentation is part of the procedure, not an afterthought.
Required record:
- Contrast agent, concentration, volume delivered vs. volume prescribed; catheter gauge and site; time of onset.
- Objective findings: measured swelling, skin color, capillary refill, pulse, sensation, pain score.
- Interventions and the patient's status at discharge.
Communication:
- Radiologist: verbal, contemporaneous - they own the medical decision.
- Referring clinician: so the ordering provider knows the study is nondiagnostic and why, and so the event is in the patient's record.
- Patient: written and verbal discharge instructions - elevate the arm, cold compress, and specifically return for care if there is worsening pain, blistering, skin breakdown, numbness, or weakness. Give a phone number and a timeframe (first 24–48 h is when delayed reactions appear).
- Incident report per policy, and a note in the RIS so the next appointment is flagged for access planning.
Note that the eGFR of 52 is irrelevant to this event but was likely why the study was ordered with IV contrast - do not let the renal number distract from the extravasation management.