Probability Model of Blood Transfusion for Cesarean Delivery Complicated by Placenta Previa
Objective: The aim of the study was to identify predictive factors for blood transfusion in women with placenta previa. Also, we construct the equation of probability of blood transfusion with placen ta previa. Methods: We retrospectively reviewed of 388 women with placenta previa who underwent cesarean section between January 2011 to December 2015 at the Department of Obstetrics and Gynecology, Chonnam National University Hospital. We analyzed the relationship between blood transfusion and
... transfusion and reproductive risk factors. The statistics were analyzed by Independent ttest, Pear son's chisquare test and Fisher's exact test. Logistic regression was used to assess the rela tionship between predictive factors and blood transfusion. Results: Threehundred and eightyeight women were selected. 278 (71.6%) women were received blood transfusion intraoperative or after operation. Multiparity, previous cesarean section, placenta previa totalis, low preoperative hemoglobin, adherent placenta, use of tocolytic agent, anteri or or anterior and posterior placenta location, history of antepartum hemorrhage, emergency operation, the presence of lacuna were more common in transfusion group. Conclusion: We concluded that multiparity, previous cesarean section, preoperative hemoglobin, placenta previa totalis, placenta location, and presence of lacuna are the strong antepartum risk factors for peripartum blood transfusion in women with placenta previa. The equation constructed by combining these variables was as follows: probability of blood transfusion in placenta previa= e x /1+e x X=2.731+0.193×Parity+0.343×previous Csec-0.324×preoperative Hgb+1.477×placenta previa totalis+1.311×ant placenta+1.021×ant & post placenta+1.796×presence of lacuna.