IL6 and atrial fibrillation: Furthermore a study by Yoon et al. of patients presenting with preterm labor and intact membranes demonstrated that AF IL-6 concentration > 2.6 ng/mL had an AUC of 0.84 for the detection of MIAC and that sterile intra-amniotic inflammation was more common than IAI (21% vs. 10%, p < 0.001), indicating the strong prevalence of sterile inflammation in this cohort [3].