Introducer catheters (i.e., Cordis catheters) are used for the placement of devices, such as pulmonary artery catheters (PACs) and certain cardiac pacing devices as well as when extremely large volume resuscitations are needed or anticipated. Since PACs and pacers may need frequent manipulation of their position, they are placed through the hemostatic valve of the Cordis, which holds them in position and prevents back leakage of blood. Different devices require and are matched to different sizes of Cordis catheters and it is imperative that the device is appropriately matched to the Cordis diameter. Occasionally, practitioners will place a standard central line catheter through the Cordis when one of the aforementioned functions is not applicable. Despite it seeming reasonable to do so, standard single-, double-, and triplelumen central venous access catheters should not be placed through a Cordis for several reasons.