This articles presents a rare case of accidental insertion of an intravascular catheter into an artery by an experienced nurse (RN). Due to the patient's hypotension, this faulty positioning was misdiagnosed and a potential peripheral ischemic necrosis was, fortunately, avoided only because the anesthesia drug injection was performed through another vein. Clinical signs were also present but were also underestimated. After intra-arterial confirmation of the incorrect position, the catheter was subsequently removed. No further complications were observed.