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Hazim J. Safi
Anders Winnerkvist
Michael J. Reardon
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Ann Thorac Surg 1998;66:1204-1208
© 1998 The Society of Thoracic Surgeons

Original articles: cardiovascular

Effect of extended cross-clamp time during thoracoabdominal aortic aneurysm repair

Hazim J. Safi, MDa, Anders Winnerkvist, MDa, Charles C. Miller, III, PhDa, Dimitrios C. Iliopoulos, MDa, Michael J. Reardon, MDa, Rafael Espada, MDa, John C. Baldwin, MDa

a Department of Surgery, Baylor College of Medicine and The Methodist Hospital, Houston, Texas, USA

Address reprint requests to Dr Safi, Department of Surgery, Baylor College of Medicine, 6550 Fannin, Suite 1603, Houston, TX 77030
e-mail: (hsafi{at}bcm.tmc.edu)

Presented at the Poster Session of the Thirty-fourth Annual Meeting of The Society of Thoracic Surgeons, New Orleans, LA, Jan 26–28, 1998.

Background. In previous studies of the neurologic outcome of patients undergoing thoracoabdominal aortic aneurysm repair with the simple cross-clamp technique, cross-clamp time of greater than 30 minutes was identified as an important risk factor. We retrospectively examined the effect of clamp time of 30 minutes or greater on outcome for patients undergoing repair with the addition of surgical adjuncts.

Methods. Between February 1991 and June 1996 we operated on 370 patients for thoracoabdominal or descending thoracic aortic aneurysm. Two hundred seventy-one of these patients with cross-clamp times of 30 minutes or greater were included in this study. One hundred twelve patients underwent simple cross-clamp repair, whereas 159 were operated on with the surgical adjuncts of distal aortic perfusion and cerebrospinal fluid drainage.

Results. By multivariate analysis, acute dissection, surgical adjuncts, and aneurysm extent proved most significant in overall patient outcome. The overall rate of early neurologic deficits was 23 of 271 (8.5%). For highest risk patients with type II thoracoabdominal aortic aneurysms, the rate of neurologic deficits was 11 of 29 (38%) for cross-clamp versus 6 of 82 (7.3%) for adjunct operation patients (odds ratio = 0.13; p < 0.001).

Conclusions. The adjuncts of cerebrospinal fluid drainage and distal aortic perfusion decreased the risk of extended cross-clamp time during thoracoabdominal aortic aneurysm repair, particularly for highest risk type II.




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