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Palpate the radial artery with three fingers. Introduce the intravenous cannula at an angle of 30–45° while feeling the pulse under the pulp of finger, simultaneously look at the hub of cannula, there will be flash of blood as it enters the artery. Depress the cannula about 10–15° and withdraw the needle a little, continuous flow of blood will be seen at the hub. Stabilize the needle and advance the catheter over it. Remove the needle and attach the 3-way with a syringe-filled with heparinized flush to the hub. Attach the pressure transducer tubing to it. Secure the catheter with suture or adhesive tape.