Placental compressibility: implications for indirect diagnosis of posterior placenta previa.
Obstet Gynecol
; 79(3): 398-402, 1992 Mar.
Article
en En
| MEDLINE
| ID: mdl-1738523
ABSTRACT
A number of problems beset the indirect diagnosis of posterior placenta previa using transabdominal ultrasound. We add a new potential complicating factor. In 128 pregnancies at or beyond 30 weeks' gestation, measurements were taken from the fetal skull to the maternal sacrum before and after compression. Up to 69% compressibility of the placenta was found in vivo and in vitro. Modified fetal skull to maternal sacrum measurement criteria were devised from the results. Placenta previa is highly unlikely if the measurement from the fetal skull to maternal sacrum is less than 10 mm before compression or less than 7 mm after compression. Placenta previa is probable if the measurement is greater than 20 mm before compression or greater than 15 mm after compression. In 40% of the cases, posterior placenta previa could not be excluded. We conclude that placental compressibility is an additional confounding problem for indirect ultrasound assessment of posterior placenta previa and that indirect assessment should be attempted only if maneuvers to image the lower uterine segment directly are unsuccessful.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Placenta
/
Placenta Previa
Tipo de estudio:
Diagnostic_studies
Límite:
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
Obstet Gynecol
Año:
1992
Tipo del documento:
Article
País de afiliación:
Nueva Zelanda