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Letters.
Imaging, Categorizing Previa
I agree with Dr. Melinda M. Scully Noah that precise definitions are crucial in the management of placenta previa ("New Placenta Previa Definitions Advocated," Sept. 1, 2001, p. 14).
There should be no problem, however, in defining placenta previa nor its degree if transvaginal sonography (TVS) is used.
Experts agree that it should be the imaging technique of choice in placenta previa, as it has been consistently shown to be superior to transabdominal sonography.
TVS allows precise imaging of the cervical internal os and the lower placental edge.
Dr. L.W Oppenheimer and colleagues showed that when the lower placental edge is 2 cm or greater from the internal os, a vaginal delivery is usually possible (Am J. Obstet. Gynecol. 165[4, pt. 1]:1036-38, 1991).
Therefore, these women can safely be offered a trial of vaginal delivery. There are, however, no data to show that women with a placental edge less than 2 cm from the internal os can safely deliver vaginally.
- New Placenta Previa Definitions Advocated.
- Magazine article from: OB GYN News BOSCHERT, SHERRY September 1, 2001 700+ words
...women need a double set-up exam for placenta previa? That depends on both how placenta previa is defined and the degree of previa...radiologists might define a marginal placenta previa as the placental edge being at the cervical stroma, but...
- Placenta Previa
- Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed. Carson-DeWitt, Rosalyn January 1, 2006 700+ words
Placenta Previa Definition Placenta previa is a condition that occurs during pregnancy when the placenta...emerge through the mother's vagina during birth. In placenta previa, the placenta develops in an abnormal location. Normally...
- Placenta previa.(Women's Health Advisor)(Disease/Disorder overview)
- Clinical Reference Systems Cooper, Phyllis G. November 1, 2008 700+ words
[ILLUSTRATION OMITTED] What is placenta previa? Placenta previa is a condition in pregnancy in which the placenta...cesarean section (C-section). How does it occur? Placenta previa occurs when the fertilized egg attaches to the...
- Placenta previa.(Causes and Treatment)(Disease/Disorder overview)
- Clinical Reference Systems January 1, 2006 700+ words
What is placenta previa? Placenta previa is a condition in pregnancy in which the placenta lies below...by cesarean section (C-section). How does it occur? Placenta previa occurs when the fertilized egg attaches to the lower part...
- Placenta Previa.(Women's Health Advisor 2004.1)
- Clinical Reference Systems Cooper, Phyllis G. January 1, 2004 700+ words
What is placenta previa? Placenta previa is a condition in pregnancy in which the placenta lies below...the baby early by cesarean section. How does it occur? Placenta previa occurs when the fertilized egg attaches to the lower part...
- Placenta Previa.
- Clinical Reference Systems Cooper, Phyllis G. November 1, 1999 700+ words
What is placenta previa? Placenta previa is a condition in pregnancy in which the placenta lies below...the baby early by cesarean section. How does it occur? Placenta previa occurs when the fertilized egg attaches to the lower part...
- Placenta Previa.(Women's Health Advisor 2002.1)
- Clinical Reference Systems Cooper, Phyllis G. January 1, 2002 700+ words
What is placenta previa? Placenta previa is a condition in pregnancy in which the placenta lies below...the baby early by cesarean section. How does it occur? Placenta previa occurs when the fertilized egg attaches to the lower part...
- C-section increases later risk of placenta previa.(Obstetrics)
- Magazine article from: OB GYN News Johnson, Kate May 1, 2006 700+ words
...cesarean section face an elevated risk of placenta previa and placental abruption in their second...previous cesarean deliveries the risk of placenta previa is increased further in the third...been reported as a risk factor for placenta previa, it has not been previously associated...