The force required to rupture fetal membranes paradoxically increases with acute in vitro repeated stretching.
Am J Obstet Gynecol
; 196(2): 165.e1-7, 2007 Feb.
Article
em En
| MEDLINE
| ID: mdl-17306666
ABSTRACT
OBJECTIVE:
The purpose of this study was to determine whether acute repetitive stretching causes fetal membranes (FM) weakening. STUDYDESIGN:
Cesarean or vaginally delivered FM were repeatedly stretched and thereafter subjected to rupture testing. Rupture strength (RS), work to rupture (WR), and stiffness were determined. Unstretched FM were compared with stretched FM.RESULTS:
In the cesarean group, FM stretched to 50% or 75% of the baseline (unstretched) RS for 10-20 cycles of 10 seconds each paradoxically showed increased RS and stiffness. WR decreased compared with baseline. Detailed analysis revealed that even a single stretch cycle initiated these changes to physical properties. Vaginally delivered FM showed similar changes in physical properties, as did separated amnion.CONCLUSION:
Acute stretch forces do not directly cause FM weakening.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Membranas Extraembrionárias
Limite:
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
Am J Obstet Gynecol
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Estados Unidos