Fetal Position and Presentation Abnormalities — Clinical Implications of Fetal Positioning During Delivery
Citation(s)
Ahmad A, Webb SS, Early B, Sitch A, Khan K, Macarthur C Association between fetal position at onset of labor and mode of delivery: a prospective cohort study. Ultrasound Obstet Gynecol. 2014 Feb;43(2):176-82. doi: 10.1002/uog.13189.
Choi SK, Park YG, Lee da H, Ko HS, Park IY, Shin JC Sonographic assessment of fetal occiput position during labor for the prediction of labor dystocia and perinatal outcomes. J Matern Fetal Neonatal Med. 2016 Dec;29(24):3988-92. doi: 10.3109/14767058.2016.1152250. Epub 2016 Mar 7.
Guittier MJ, Othenin-Girard V, de Gasquet B, Irion O, Boulvain M Maternal positioning to correct occiput posterior fetal position during the first stage of labour: a randomised controlled trial. BJOG. 2016 Dec;123(13):2199-2207. doi: 10.1111/1471-0528.13855. Epub 2016 Jan 24.
Khan KS Optimal fetal positioning: a theory in tatters-time to rewrite textbooks. BJOG. 2016 Dec;123(13):2207. doi: 10.1111/1471-0528.13872. Epub 2016 Jan 25.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
