Cerebroplacental Ratio as a Predictive Factor of Emergency Cesarean Sections for Intrapartum Fetal Compromise: A Systematic Review.

Background : This systematic review aimed to clarify the association between the cerebroplacental ratio (CPR) and emergency cesarean sections (CSs) due to intrapartum fetal compromise (IFC). Methods : Datasets of PubMed, ScienceDirect, CENTRAL, Embase, and Google Scholar were searched for studies published up to January 2024 regarding the relationship between the CPR and the rate of CS for IFC, as well as the predictive value of the CPR. Results : The search identified 582 articles, of which 16 observational studies were finally included, most of them with a prospective design. A total of 14,823 patients were involved. A low CPR was associated with a higher risk of CS for IFC. The predictive value of the CPR was very different among the studies due to substantial heterogeneity regarding the group of patients included and the time interval from CPR evaluation to delivery. Conclusions : A low CPR is associated with a higher risk of CS for IFC, although with a poor predictive value. The CPR could be calculated prior to labor in all patients to stratify the risk of CS due to IFC.