Hi, I had a pt who was a hard stick and the doctor ended up trying to insert the IV. The catheter and tubing was an arterial line set up but he was searching for a vein. He finally got it. I went to give meds and noticed it was pulsating. We then set up the pressure bag and the rest of the equipment to see if it was in fact in the artery. The monitor was giving inconsistent readings and we ended up with getting a PICCm on the other side. Regardless, how would one no for sure if it is in the artery or vein? (as we still dont know) Im assuming if it was in the artery the pressure would be reading much higher? Although her pressure was already 200s/140s.