Updating the amniotic fluid index nomograms according to perinatal outcome

摘要

Background: The two most commonly used nomograms for amniotic fluid index (AFI) were developed by Moore and Cayle and Magann et?al. However, there are several inconsistencies between the two methods. Objective: The aim of the study was to determine whether these differences carry clinical significance. Methods: A retrospective cohort of women with singleton pregnancies evaluated for AFI during pregnancy at a tertiary medical center in 2007?2014 were divided into five groups: group A, definite oligohydramnios?AFI below the fifth percentile according to the nomograms of both Moore and Cayle and Magann et?al.; group B, intermediate oligohydramnios?AFI below the fifth percentile according to only one nomogram (Moore and Cayle); group C, euhydramnios?normal AFI according to both nomograms; group D, intermediate polyhydramnios?AFI above the 95th percentile according to one nomogram (Magann et?al.); group E, definite polyhydramnios?above the 95th percentile according to both nomograms. The association of group by maternal and perinatal outcomes was analyzed. Results: A total of 6987 women were included: group A, 996 (14%); group B, 1344 (19%); group C, 2561 (37%); group D, 1051 (15%); group E, 1034 (15%). Group B (intermediate oligohydramnios) was characterized by significantly lower rates of adverse perinatal outcomes than group A (definite oligohydramnios): small for gestational age neonate (12.3 versus 15.2%, p?=?.05), neonatal intensive care unit admission (11.1 versus 21.5%; p?