Braun, Stuart V.; Hedden, Douglas M.; Howard, Andrew W.
October 2006
Journal of Bone & Joint Surgery, American Volume;Oct2006, Vol. 88-A Issue 10, p2252
Academic Journal
Background: Superior mesenteric artery syndrome is a known complication associated with the correction of spinal deformity. Recent investigations of this disorder have focused on patient height and weight. We are not aware of any published study examining the degree of deformity, type of curve, or magnitude of correction, and to our knowledge all of the reported literature on this syndrome lacks control data. The purpose of this study was to examine the relationship between the correction of spinal deformity and the development of superior mesenteric artery syndrome in patients with scoliosis. Our hypothesis was that greater correction of spinal deformity would increase the risk of the development of superior mesenteric artery syndrome. Methods: A case-control study was performed over a five-year period. The primary outcome measure was the development of superior mesenteric artery syndrome. The predictor variables that were considered included demographic characteristics; preoperative height, weight, and body mass index; aspects of the deformity, including curve magnitude, Lenke curve classification, and correction; and operative factors, including surgical approach, estimated blood loss, and the presence of operative hypotension. Results: A review of the records on 364 surgical procedures for scoliosis identified seventeen cases of superior mesenteric artery syndrome. Thirty-four subjects who had had surgery for scoliosis but no superior mesenteric artery syndrome were randomly selected as controls. Eight of the seventeen subjects with superior mesenteric artery syndrome had undergone a two-stage procedure (compared with one of the thirty-four controls, p < 0.001), nine of the seventeen had had combined anterior and posterior procedures (compared with two of the thirty-four controls, p < 0.001), and seven of the seventeen had had a thoracoplasty (compared with two of the thirty-four controls, p < 0.001). No significant differences were noted between the groups with regard to demographic factors. Compared with the controls, the patients in whom superior mesenteric artery syndrome developed were shorter (by a mean of 7.1 cm, p = 0.03), weighed less (by a mean of 11.5 kg, p = 0.001), had a lower body mass index (p = 0.003), had a greater minimal thoracic curve magnitude achieved by bending (a mean of 12° greater [45° for subjects with superior mesenteric artery syndrome and 33° for controls], p = 0.015), had a lower percent correction of the thoracic curve on bending (a mean of 11% lower, p = 0.025), and had more lumbar lateralization (88%, compared with 61% in the control group, had a Lenke lumbar modifier of B or C instead of A, p = 0.008). Multivariate logistic regression analysis identified a staged procedure (odds ratio, 31.0), the lumbar modifier (odds ratio, 9.06), body mass index (odds ratio, 7.75), and thoracic stiffness (odds ratio, 6.67) as the most predictive of the development of superior mesenteric artery syndrome. Conclusions: Preoperative identification of the risk factors described above in conjunction with preoperative nutritional maximization should be considered in order to limit the prevalence of superior mesenteric artery syndrome in patients undergoing surgical correction of spinal deformity.


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