High preoperative C-reactive protein level is a risk factor for acute exacerbation of interstitial lung disease after non-pulmonary surgery.

Several studies have investigated the incidence of and risk factors for acute exacerbation (AE) in patients with interstitial lung disease (ILD) after lung resection surgery. However, the incidence and risk factors for AE-ILD after non-pulmonary surgery are not known. The aim of this study was to investigate the incidence of and risk factors for AE-ILD after non-pulmonary surgery.Eighty patients who were diagnosed with ILD on preoperative chest computed tomography (CT) imaging and underwent non-pulmonary surgery under general anesthesia at Hiroshima University Hospital between September 2011 and September 2017 were enrolled. We retrospectively compared the preoperative patient characteristics, laboratory findings, and factors associated with anesthetic management between the patients who developed AE-ILD and those who did not.The incidence of AE-ILD after non-pulmonary surgery was 6.3% and the mortality rate was 80%. Univariate logistic analysis showed that a usual interstitial pneumonia pattern on computed tomography, a high C-reactive protein (CRP) level, a long operating time, high blood loss, and blood transfusion during surgery were significant risk factors for AE-ILD. In multivariate analysis, only a high CRP level (odds ratio 2.556, 95% confidence interval 1.110-5.889, P = .028) was identified as an independent risk factor for AE-ILD after non-pulmonary surgery.The risk of AE-ILD should be kept in mind in patients with ILD and a high CRP level before non-pulmonary surgery. These patients should also be monitored carefully for development of AE-ILD after surgery.