Indução do trabalho de parto na America Latina : inquerito hospitalar / Induction of labor in Latin America : a hospital survey

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Objective: To evaluate the prevalence of both medical and elective labor induction as well as employed methods, success rates, associated factors and maternal and perinatal outcomes in eight Latin American countries. Methods: it was performed an analysis on labor induction in the database of the "2005 WHO global survey on maternal and perinatal health" on deliveries occurring in eight randomly allocated Latin American countries. Data of all women who gave birth to children in the 120 included institutions during the period of the study were collected. The indications for labor induction according to the country, the success rate for each method, the factors associated with labor induction as well as maternal and perinatal outcomes were compared with deliveries with spontaneous onset of labour (Approach 1). A second independent analysis on elective induction compared with spontaneous onset of labor in low-risk pregnancies was performed in order to evaluate factors associated with elective labor induction and also maternal and perinatal outcomes (Approach 2). The odds ratios (OR) for possible factors associated with labor induction and the risk ratios (RR) for maternal and perinatal outcomes, with respective confidence interval (95%CI) for all types of labor induction and for elective induction were estimated. Additionally, multiple logistic regressions were applied to adjust the estimated risks. Results: Among the total 97,095 deliveries included in the survey, 11,077 (11.4%) underwent labor induction. Public hospitals accounted for 74.2% of them. Premature rupture of membranes (25.3%) and elective induction (28.9%) were the most frequent indications. The success rate in obtaining vaginal delivery was 70.4%. Oxitocin and misoprostol - the most employed methods - had success rates of 69.9% and 74.8%, respectively. Labor induction occurred more frequently in women older than 35 years, with a partner, nulipara, without cesarean section in the last pregnancy, ruptured membranes, hypertension, low fundal height, diabetes, severe anemia, vaginal bleeding, few prenatal visits, post term, cephalic presentation and those who gave birth in social security hospitals. The most frequent maternal complications associated with labor induction were need for uterotonic agents in postpartum period, perineal laceration, need for hysterectomy, and admission to intensive care unit, length of hospital stay above seven days and increased need of anesthetic/analgesic procedures. The most frequent adverse perinatal outcomes were low 5-minute Apgar score, very low birth-weight, admission to neonatal intensive care unit and delayed initiation of breastfeeding. Concerning elective induction in low-risk pregnancies there was no difference in cesarean section rate or perinatal outcome. However, there were increased needs for uterotonic agents in the postpartum period and for analgesic/anesthetic procedures, and a further than fivefold risk for postpartum hysterectomy. Conclusions: In Latin America, the overall labor induction rate was slightly more than 10%, while for elective indication among low risk pregnancies it was 4.9%. The vaginal delivery rate was high irrespective of the method or indication. However, there are some maternal and perinatal risks associated with this intervention, in spite of medically or electively indicated

ASSUNTO(S)

trabalho de parto labor perinatology induced (obstetrics) pregnancy risks factors fatores de risco pregnancy gravidez labor (obstetrics) gravidez - complicações trabalho de parto induzido perinatologia

ACESSO AO ARTIGO

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