The impact of maternal anemia and labor on the obstetric Shock Index in women in a developing country

Background The Shock Index is a clinical tool to evaluate the hemodynamic status during hemorrhage. The impact of labor and pre-existing anaemia is unknown. The objective was to describe and discuss its clinical utility in this context. Methods This was a prospective cross-sectional study. The Shock Index (ratio between heart rate and systolic blood pressure) was measured in pregnant women at term, before or during labor. They were stratified according to the presence of anemia. Results The median Shock Index was significantly lower in women in labor than in those not in labor (0.72 (IQR: 0.64–0.83) vs. 0.85 (IQR: 0.80–0.94); p