Comparación de resultados obstétricos y perinatales del parto en postura vertical versus supina

background: Vertical position is an option to delivery to which several advantages have been attributed. This research exposes its related findings. Objective: To compare obstetric and perinatal outcomes between supine and vertical position at delivery. Patients and method: We performed a randomized double-blind study including healthy women assigned to the supine or upright posture (vertical) during labor with complications following the delivery in the puerperium stage. The variables evaluated were: blood loss, pain in the second period of labor and immediate postpartum, duration of the second period of labor, perineal and vaginal tears, need to forceps implement, accommodation in position and perinatal outcome. Articulo original Results: 164 patients were randomized into two groups, the vertical position (I) and the supine position (II). The losses were 5.4%, and the Caesarean rate was of 4.6%. Difference was found only for vaginal tears in the vertical posture, with a relative risk of 1.4 (CI 1.1-3.2), and shortening of the second period with a significant difference of 10 minutes on average (p < 0.05). Conclusions: The upright posture during childbirth provides no improvement in perinatal outcomes and fewer obstetric conditions. It shortens the second period of labor, but it is a risk factor for vaginal tears. The best position for birth is which offers more comfort to the patient.