| http://www.w3.org/ns/prov#value | - PTCA is a procedure wherein a small incision is made in the artery in the thigh or arm of the patient to leave the introducer sheath in the incision; a guidewire is first introduced through the lumen of the introducer sheath; a hollow tube called a guide catheter is inserted in the blood vessel and over the guidewire to place the guide catheter at the entrance of the coronary artery; the guidewire
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