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"Arterial puncture with a small “finder” needle is usually benign and occurs in up to 11% of cases of IJV cannulation" Arora and Lee (2022).
Inadvertent carotid artery cannulation

Extract:

“Arterial cannulation during placement of a central venous catheter can cause significant morbidity. Complications from arterial misplacement include bleeding, hematoma formation, hemothorax, pseudoaneurysm formation, arteriovenous fistula formation and stroke. Arterial puncture with a small “finder” needle is usually benign and occurs in up to 11% of cases of IJV cannulation. On the other hand, arterial misplacement of venous cannulasis a much more morbid complication and is known to occur in 0.1% to 0.8% cases of IJV cannulation. Unintended arterial cannulation can occur with or without the catheter traversing the IJV.”

Reference:

Arora V, Lee A. Posterior wall puncture of internal jugular vein and inadvertent carotid artery cannulation. Med Ultrason. 2022 Aug 31;24(3):375-376. doi: 10.11152/mu-3727. PMID: 36047415.