Arterial line complications: how do you recognize and respond to catheter occlusion or infiltration?

Arterial line complications: how do you recognize and respond to catheter occlusion or infiltration?

• A. Normal waveform with a stable trace.
• B. There is no need to check waveform.
• C. If occluded, continue to attempt high-flow flush without assessment.
• D. Absent or dampened waveform; flush patency with saline, reposition catheter, or remove if compromised; assess limb perfusion.

Answer: (D)

Recognizing arterial line problems comes down to how the signal looks and what happens when you try to use the line. An occluded or infiltrated catheter usually shows an absent or dampened arterial waveform, meaning the trace loses its normal sharp systolic peak and overall amplitude. That damped or flat trace signals that the catheter is not effectively sampling arterial blood and may be outside the vessel or blocked. The correct response is to test patency with a saline flush. If the flush restores a clear waveform, you’ve likely regained patency and can reposition the catheter or adjust its position to improve function, while continuing to monitor. If the flush does not restore patency or you meet resistance, the catheter is compromised or malpositioned, and you should remove or replace it, then reassess the limb. Along with these steps, always assess distal perfusion in the affected limb—look for color, warmth, capillary refill, and distal pulses—to ensure you’re not causing or masking ischemia. Avoid continuing a high-flow flush without assessment, as this can mask problems or cause injury if the line is infiltrated or severely occluded.

Recognizing arterial line problems comes down to how the signal looks and what happens when you try to use the line. An occluded or infiltrated catheter usually shows an absent or dampened arterial waveform, meaning the trace loses its normal sharp systolic peak and overall amplitude. That damped or flat trace signals that the catheter is not effectively sampling arterial blood and may be outside the vessel or blocked.

The correct response is to test patency with a saline flush. If the flush restores a clear waveform, you’ve likely regained patency and can reposition the catheter or adjust its position to improve function, while continuing to monitor. If the flush does not restore patency or you meet resistance, the catheter is compromised or malpositioned, and you should remove or replace it, then reassess the limb. Along with these steps, always assess distal perfusion in the affected limb—look for color, warmth, capillary refill, and distal pulses—to ensure you’re not causing or masking ischemia.

Avoid continuing a high-flow flush without assessment, as this can mask problems or cause injury if the line is infiltrated or severely occluded.