Spinal cord protection during open repair of thoracic and thoracoabdominal aortic aneurysms using profound hypothermia and circulatory arrest.

BACKGROUND: Reduced risk of paraplegia is argued as an advantage of endovascular repair of descending thoracic aortic aneurysms (DTA) and thoracoabdominal aortic aneurysms (TAAA); however, paraplegia rates with open repair vary widely. STUDY DESIGN: We identified consecutive patients undergoing open repair of TAAA or DTA with or without arch replacement using profound hypothermia and circulatory arrest as a spinal cord protection strategy on a single surgical service between June 1, 2001 and September 20, 2010. RESULTS: Ninety-nine procedures were performed in 94 patients with a mean age of 59 years (range 19 to 84 years), 56 of whom were male (60%). The extent of repair was TAAA in 37 (Crawford extent I in 6, extent II in 28, and extent III in 3), DTA in 37, and DTA plus arch in 25. Surgery was urgent or emergent in 25 patients (25%). Operative mortality (30-day) was 10% (10 of 99), including a mortality of 12% for arch DTA (3 of 26), 11% for TAAA (4 of 25), and 5% for isolated DTA (2 of 37). There were 11 (11%) strokes and 11 patients experienced renal failure (7 with dialysis). There were 15 late deaths and survival at 5 years was 74% (95% CI, 62.4-88.2%). No patients experienced paraplegia, although one had delayed paraparesis thought to be secondary to refractory hypotension postoperatively. CONCLUSIONS: Although the mortality and stroke risks for patients undergoing repair of DTA or TAAA using profound hypothermia and circulatory arrest are substantial, the risk for paraplegia is low. In appropriately selected patients, profound hypothermia and circulatory arrest should be the preferred technique for spinal cord protection for DTA and TAAA.

Variability in data: the Society of Thoracic Surgeons National Adult Cardiac Surgery Database.

OBJECTIVE: Since 1989, data have been reported to the Society of Thoracic Surgeons National Adult Cardiac Surgery Database for quality improvement. This information is also data mined for national quality indicators, policy initiatives, and research. Such use has important limitations, because data elements cannot be verified for accuracy. We determined variability of disease etiology and operative data database elements when abstracted by untrained physician abstractors. METHODS: We selected 30 patients who underwent cardiovascular surgery from January to December 2005 (10 each of coronary artery bypass grafting, mitral valve repairs, and aortic valve and associated aortic procedures). Four abstractors (2 cardiothoracic residents and 2 fellows) abstracted 28 variables. Results were compared with abstraction performed by a professional abstractor. RESULTS: Median percentage agreement among all cases was 89% (range, 42%-100%). Agreements were 94% (28%-100%) for mitral valve, 84% (48%-100%) for aortic valve, and 93% (35%-100%) for coronary artery bypass grafting. Among the aortic valve group, etiology of aortic valve disease had poor agreement (68%) because of cases in which multiple definitions could apply. Degree of valvular regurgitation also had poor agreement (median, 67%; range, 28%-95%). Number of internal thoracic artery grafts and absence of significant valvular disease were reported consistently. Agreements between types of aortic valve procedure and between methods of mitral valve repair (65% and 83%, respectively) were less than expected. CONCLUSIONS: We found variable agreement among untrained data abstractors. This has important implications regarding interpretation of database studies with de-identified data. Without good quality control and consistent standardized definitions, aggregate data in clinical databases may be suspect.