COMBINED USE OF CEREBRAL SPINAL-FLUID DRAINAGE AND NALOXONE REDUCES THE RISK OF PARAPLEGIA IN THORACOABDOMINAL ANEURYSM REPAIR

Purpose: This report summarizes our experience with the use of cerebra l spinal fluid drainage (CSFD) and naloxone for prevention of postoper ative neurologic deficit (paraplegia or paraparesis). Methods: We revi ewed 110 consecutive patients with 86 thoracoabdominal aneurysms and 2 4 thoracic aneurysms. The status of 47 patients (43%) was acute (ruptu re or dissection), and the status of 52 (47%) was Crawford type I or I I. None of the patients had intercostal artery reimplantation. There w ere two patient groups for analysis of neurologic deficit risk. Group A (61 patients) received naloxone and CSFD, and group B (49 patients) did not. Results: One deficit occurred in group A and 11 deficits occu rred in group B (p = 0.001). By multiple logistic regression analysis, the variables acute status, Crawford type II, or group B classificati on were significant factors for deficit risk. Use of the same logistic regression analysis on the subgroup of 47 patients with acute aneurys ms and 33 patients with Crawford type 2 aneurysms confirmed the protec tive effect of combined CSFD and naloxone (group A) and that clinical presentation and extent of aorta replaced are the primary risk factors for development of deficit. To test this conclusion we developed a hi ghly predictive model (correlation coefficient 0.997 with 16 series of thoracoabdominal aneurysms) for neurologic deficit. We applied our da ta to this model. Group B had the predicted number of deficits, and gr oup A had substantially fewer deficits than predicted. Conclusions: We conclude that the combined use of CSFD and naloxone offers significan t protection from neurologic deficits in patients undergoing thoracoab dominal and thoracic aortic replacement.