Radial Access, Spasm, and Loss of the Guidewire
You are scrubbed for a transradial diagnostic catheterization on a 60-year-old woman. After sheath placement and a single dose of intra-arterial verapamil and nitroglycerin, the operator advances a 5F diagnostic catheter over a 0.035-inch guidewire. The patient winces and reports forearm pain; the catheter meets resistance and will not advance, and the pressure waveform dampens. The operator pushes harder. You notice the guidewire tip has stopped moving on fluoroscopy and appears to be looping.
1. What complication is developing, and what signs point to it?
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Radial artery spasm with risk of guidewire trauma/looping.
Signs:
- Patient pain in the forearm during catheter advancement.
- Resistance to catheter passage and a damped pressure waveform (reduced flow through a narrowed, spasming artery).
- Fluoroscopic evidence of the wire tip not advancing and looping - the wire is meeting resistance and buckling rather than tracking.
Pushing harder against spasm risks arterial injury, dissection, or wire perforation. The correct response is to stop and treat the spasm, not to force passage.
2. What should be done now, in order?
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- Stop pushing - halt catheter and wire advancement; do not force.
- Treat spasm: ensure adequate intra-arterial verapamil and/or nitroglycerin (confirm the prior dose; give additional per protocol/physician order), and consider warm compresses and reassuring/analgesia for the patient.
- Withdraw the wire slightly to relieve the loop while keeping control of both ends; never lose hold of the wire.
- Wait and reassess - spasm often relaxes within minutes; recheck the waveform and fluoroscopy before re-advancing gently over the wire.
- If it persists: consider a smaller catheter, hydrophilic-coated wire, or converting to femoral access if radial cannot be salvaged.
- Monitor for hematoma, loss of radial pulse, or signs of dissection; document the event.
3. If the wire had been lost and the tip migrated distally, how would the management priorities change?
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A retained/lost guidewire is a serious adverse event requiring escalation:
- Do not blindly advance or retrieve with another device - this risks further vascular injury or embolization.
- Localize it fluoroscopically (and with a full-length view) to determine position: still in the radial/brachial artery vs. embolized centrally.
- Call for senior help and the physician immediately; notify the patient.
- Prevent embolization: if the wire is still accessible, maintain control of the proximal end and gently retrieve under fluoroscopy; consider vasodilators to reduce spasm that may be trapping it.
- If it embolizes or cannot be retrieved percutaneously, plan surgical or endovascular retrieval (snare) and document thoroughly.
- Anticoagulation status and vascular surgery consultation become relevant depending on location and dwell time.
The key judgment: a lost wire converts a routine case into an urgent retrieval problem - stop, localize, escalate, and avoid blind manipulation.