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The Annals of Thoracic Surgery, Vol 58, 19-22, Copyright © 1994 by The Society of Thoracic Surgeons

ARTICLES

Graft replacement of the descending thoracic aorta: results of "open" distal anastomosis

SA Scheinin and DA Cooley
Division of Cardiovascular Surgery, Texas Heart Institute, Houston 77225.

With the advent of rapid autotransfusion, we began to repair aneurysms of the descending thoracic and thoracoabdominal aorta by using an "open" technique, in which a single cross-clamp is placed proximal to the aneurysm to exsanguinate the lower body. To determine whether open distal anastomosis effectively protects against spinal cord injury, we studied 71 consecutive patients (50 men, 21 women) who underwent this procedure beginning in April 1989. The patients ranged in age from 31 to 83 years (mean, 63.3 years). Most patients were hypertensive (n = 61; 86%) and symptomatic (n = 54; 76%). Most had been diagnosed with medial degeneration (n = 45; 63.4%) or aortic dissection (n = 16; 22.5%). Five patients (7.0%) were admitted with aortic rupture. We replaced the entire descending thoracic aorta in 31 (43.7%), the thoracoabdominal aorta in 21 (29.6%), and a segment of the descending thoracic aorta in 19 (26.7%). The average distal ischemic time was 22.4 minutes (range, 11 to 42 minutes). The amount of blood returned through the autotransfusion device averaged 2,099 mL. Eight patients (11.3%) died within 30 days (multiple organ failure, 3; hemorrhage, 2; coexisting ischemic heart disease, 3). Spinal cord dysfunction occurred in 6 patients (8.5%) (lower extremity paraparesis, 4; paraplegia, 2). Renal insufficiency requiring dialysis occurred in 4 patients (5.6%). We believe that the low incidence of spinal cord injury and renal insufficiency in this series may have resulted from the free draining of the intercostal and lumbar arteries during aortic occlusion, which decreases cerebrospinal fluid and central venous pressures.(ABSTRACT TRUNCATED AT 250 WORDS)

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