Oligohydramnios

Preterm Premature Rupture of Membranes (PPROM) before 37 weeks of pregnancy is responsible for 40% of preterm births in the United States. The PPROM Registry aims to identify possible causes of PPROM, evaluate trends in expectant management, measure maternal and fetal care, and to review short term and long term outcomes of affected pregnancies and births.

Based on previous studies, Both sildenafil and L-arginine helped to improve idiopathic oligohydramnios. In this study, Level of improvment of oligohydramnios will be compared. As well as, NICU admission to neonates of pregnancies complicated by idiopathic oligohydramnios. The end goal is to help physicians use the best drug for their patients.

The present trial intends to assess the diagnostic accuracy of symphysis fundal height (SFH) as opposed to SFH combined with point of care ultrasound to measure the fetal abdominal circumference (POC-US-AC) in identifying small and large for gestational age infants (SGA and LGA infants) among low-risk pregnant women cared for by midwives after 35 weeks' gestation. Low risk pregnancies will be evaluated at 35-38, 40, 41, and 41+ weeks' gestation by midwives trained in SFH measurement and POC-US. Formal obstetric US performed by a perinatologist (i.e high risk obstetrician) will be performed in case SFH and/or POC-US suspect fetal growth or amniotic fluid abnormalities. Prenatal evaluations will be compared to actual birthweights.