Akmal S, Kametas N, Tsoi E, Hargreaves C, Nicolaides KH Comparison of transvaginal digital examination with intrapartum sonography to determine fetal head position before instrumental delivery. Ultrasound Obstet Gynecol. 2003 May;21(5):437-40. doi: 10.1002/uog.103.
Iversen JK, Jacobsen AF, Mikkelsen TF, Eggebo TM Structured clinical examinations in labor: rekindling the craft of obstetrics. J Matern Fetal Neonatal Med. 2021 Jun;34(12):1963-1969. doi: 10.1080/14767058.2019.1651283. Epub 2019 Aug 19.
Ramphul M, Ooi PV, Burke G, Kennelly MM, Said SA, Montgomery AA, Murphy DJ Instrumental delivery and ultrasound : a multicentre randomised controlled trial of ultrasound assessment of the fetal head position versus standard care as an approach to prevent morbidity at instrumental delivery. BJOG. 2014 Jul;121(8):1029-38. doi: 10.1111/1471-0528.12810. Epub 2014 Apr 11.
Intrapartum Translabial Ultrasonography Reliability in Comparison With Traditional Digital Examination
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.
