Background: Uterine involution assessments are critical for the prevention of postpartum hemorrhage. Various methods have been used worldwide.
Methods: The PUUS (Postpartum Uterine Ultrasonographic Scale) method evaluates, by transabdominal ultrasonography, the length of the endometrium of the uterine cavity occupied by blood or debris, from grade 0 (no blood) to grade 4 (over three-quarters of the endometrial length occupied by blood/debris). A total of 131 consecutive patients admitted for delivery in the Elena Doamna Obstetrics and Gynecology University Hospital in Iasi, Romania, were prospectively evaluated using the PUUS method. The mean age was 27.72 years old, and they were examined during the first 24-48 h after vaginal delivery, or in the first 48-72 h after cesarean delivery. For patients with a PUUS grade greater than 1, re-examination was preformed daily in the following days, until the PUUS grade decreased to 1 or 0.
Results: By standardizing uterine involution in a numerical fashion, we precisely demonstrate that uterine involution varied with the method of delivery (vaginal/cesarean) and with the number of vials of oxytocin received intrapartum, but not with the number of vials of ergometrine maleate received, and not with the origin of the parturient (rural/urban).
Keywords: endometrial length; obstetric delivery; postpartum hemorrhage; uterine retraction; uterine ultrasonography.