Epidural catheters of the multi-orifice type: dangers and complications.

A study on epidural catheters of the multi-orifice type, investigating their tendency to epidurovasal (with an intravascularly positioned catheter tip) and epidurosubarachnoid (with the catheter tip inserted in the subarachnoid space) malpositioning, was conducted on 113 patients using clinical and radiological criteria as controls. Of the improperly placed catheters, 13 were in an epidurovasal (11.5%) and one was in an epidurosubarachnoid (0.9%) position. The findings demonstrate the occasional hazardous dual compartmental misplacement of multi-orifice catheters, in which a distal opening can lie intravascularly or within the subarachnoid space, while a proximal orifice simultaneously retains normal access to the epidural space. The insufficiency of controlling or even recognizing such improperly placed catheters which are only partially in the epidural space, as well as the danger of causing a secondary dural or vascular perforation with epidural catheters, is discussed. Since epidural catheters of the multi-orifice type apparently represent an inherent, vital danger due to their construction (regardless of the catheter material and workmanship), they should no longer be used.