Breech presentation in Spain, 1992: a collaborative study.
OBJECTIVE
The goals of the present work were to study the incidence of breech deliveries in Spain, the causes for breech presentation and its management and the incidence of cesarean sections and its correlation with the perinatal mortality rates among different centers.


METHODS
Data from 102,038 deliveries, 3829 of which were singleton breech deliveries attended in 1992, were obtained from 40 hospital centers located in different autonomic communities of Spain and analyzed using a computer statistical package (R-sigma, Horus Hardware).


RESULTS
The incidence of breech deliveries was 3.8%, although this proportion varied between different centers and regions. Up to 18% of the cases occurred in preterm. The most frequent causes were prematurity and uterine malformations. In its management, an increase in the tendency to perform elective cesarean section was noticed. The incidence of cesarean sections reached 14.9% of the total and 67.9% in breech deliveries. Perinatal mortality rate in breech deliveries was more than four times that of all deliveries, according to national standards, and more than three times according to international standards (47.8 versus 11.8 x 1000, and 24.7 versus 8 x 1000, respectively). The intrapartum and neonatal mortality in breech deliveries was 13 x 1000. No correlation between incidence of cesarean sections and perinatal mortality rates was found. Primiparity, deflexed head, macrosomia and prematurity were the most decisive parameters to indicate a cesarean section. Neither the external cephalic version nor the total breech extraction were common procedures.


CONCLUSIONS
The incidence of breech deliveries is variable between different centers (1.7%-5.1%) and Spanish regions (3.3%-4.3%), with a mean of 3.8% in overall and 11.4% in preterm deliveries. There is a tendency to perform cesarean sections, especially in primiparae. There is no correlation between the percentage of cesarean sections in each center and the perinatal mortality rate. External cephalic version and total breech extraction were uncommon procedures.
D001946:Breech Presentation; D002585:Cesarean Section / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007752:Obstetric Labor, Premature / Q000150:complications; D011247:Pregnancy; D013030:Spain; D014599:Uterus / Q000002:abnormalities