Assessing the Incremental Value of Blood Oxygen Saturation (SpO2 ) in the miniPIERS (Pre-eclampsia Integrated Estimate of RiSk) Risk Prediction Model

• Published in: Journal of obstetrics and gynaecology Canada Vol. 37; no. 1; pp. 16 - 24
• Main Authors: Payne, Beth A., PhD, Hutcheon, Jennifer A., PhD, Dunsmuir, Dustin, MSc, Cloete, Garth, MEng, Dumont, Guy, PhD, Hall, David, MD, Lim, Joanne, MASc, Magee, Laura A., MD, Sikandar, Rozina, MD, Qureshi, Rahat, MD, Papendorp, Erika van, RN, Mark Ansermino, J., MD, Dadelszen, Peter von, MBChB
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Inc 2015
• Subjects: Adult; Blood Gas Monitoring, Transcutaneous; Female; Humans; Obstetrics and Gynecology; Oxygen - blood; Pre-Eclampsia - blood; Pre-Eclampsia - diagnosis; Preeclampsia; Pregnancy; prognosis; Prospective Studies; pulse oximetry; recalibration; Risk Assessment; Young Adult; pulse oximetry; recalibration; prognosis; Preeclampsia; preeclampsia
• ISSN: 1701-2163
• DOI: 10.1016/S1701-2163(15)30358-3

Abstract Objective To assess the incremental value of blood oxygen saturation (SpO2 ) as a predictor in the miniPIERS model, a risk prediction model for adverse outcomes among women with a diagnosis of hypertensive disorder of pregnancy (HDP) in low-resourced settings. Methods Using data from a prospective cohort including 852 women admitted to hospital for a HDP, the association between SpO2 and adverse maternal outcome was assessed using logistic regression. The miniPIERS model was recalibrated and extended to include SpO2 . The incremental value of adding SpO2 to the model was measured using a net reclassification index (NRI), sensitivity, specificity, positive and negative predictive values, and likelihood ratios. Results SpO2 of < 93% was associated with a 30-fold increase in risk (95% CI 14 to 68) of adverse maternal outcome compared to women with SpO2 > 97%. After recalibration and extension, the miniPIERS model including SpO2 (vs. not including SpO2 ) had improved sensitivity (32.8% vs. 49.6%) at the cost of minimally decreased specificity (91.5% vs. 96.2%) with a NRI of 0.122. Conclusion SpO2 is a significant independent predictor of risk in women with a HDP. Adding SpO2 to the miniPIERS model improved the model’s ability to correctly identify high-risk patients who would benefit most from interventions.