Chen X, Shan R, Song Q, Wei X, Liu W, Wang G Placenta percreta evaluated by MRI: correlation with maternal morbidity. Arch Gynecol Obstet. 2020 Mar;301(3):851-857. doi: 10.1007/s00404-019-05420-5. Epub 2020 Jan 4.
Gulati A, Anand R, Aggarwal K, Agarwal S, Tomer S Ultrasound as a Sole Modality for Prenatal Diagnosis of Placenta Accreta Spectrum: Potentialities and Pitfalls. Indian J Radiol Imaging. 2021 Oct 19;31(3):527-538. doi: 10.1055/s-0041-1735864. eCollection
Huijgen QC, Gijsen AF, Hink E, Van Kesteren PJ Cervical tourniquet in case of uncontrollable haemorrhage during caesarean section owing to a placenta accreta. BMJ Case Rep. 2013 Apr 22;2013:bcr2013009237. doi: 10.1136/bcr-2013-009237.
Jauniaux E, Hussein AM, Fox KA, Collins SL New evidence-based diagnostic and management strategies for placenta accreta spectrum disorders. Best Pract Res Clin Obstet Gynaecol. 2019 Nov;61:75-88. doi: 10.1016/j.bpobgyn.2019.04.006. Epub 2019 Apr 30.
Palacios Jaraquemada JM, Bruno CH Magnetic resonance imaging in 300 cases of placenta accreta: surgical correlation of new findings. Acta Obstet Gynecol Scand. 2005 Aug;84(8):716-24. doi: 10.1111/j.0001-6349.2005.00832.x.
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.
