Risk factors for pulmonary complications after spine surgery

Study design: Registry study with prospectively collected data Objective: To determine risk factors for pulmonary complications in spine surgery. Methods: The Spine End Results Registry 2003–2004 is an exhaustive database of 1,592 patients who underwent spine surgery at the University of Washington Medical Center or Harborview Medical Center. Detailed information regarding patient demographic, medical comorbidity, and comorbidities, surgical invasiveness and adverse outcomes were prospectively recorded. The primary outcome measure was the occurrence of a pulmonary complication following surgery. Univariate relative risks and 95% confidence intervals for each of the risk factors were determined. Multivariate log binomial regression analysis was performed to investigate the association between each risk factor and a pulmonary complication, while controlling for other important risk factors. Results: Altogether, there were 199 pulmonary complications after spine surgery. The cumulative incidence of a respiratory complication after spine surgery was 9% (144 patients). Multivariate analysis suggested gender, chronic obstructive pulmonary disease, congestive heart failure, diabetes, age, diagnosis, surgical invasiveness and surgery in the thoracic spine are significant risk factors for pulmonary complications after spinal surgery. Conclusions: The results of the present study suggest numerous statistically significant risk factors for pulmonary complications after spine surgery. These results may aid the clinician with preoperative risk stratification and patient counseling. [Table: see text] The definiton of the different classes of evidence is available on page 73.