Document Detail

Soft versus rigid vacuum extractor cups for assisted vaginal delivery.
MedLine Citation:
PMID:  10796203     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The original cups used for vacuum extraction delivery of the fetus were rigid metal cups. Subsequently, soft cups of flexible materials such as silicone rubber or plastic were introduced. Soft cups are thought to have a poorer success rate than metal cups. However they are also thought to be less likely to be associated with scalp trauma and less likely to injure the mother.
OBJECTIVES: The objective of this review was to assess the effects of soft versus rigid vacuum extractor cups on perineal injury, fetal scalp injury and success rate.
SEARCH STRATEGY: We searched the Cochrane Pregnancy and Childbirth Group trials register and the Cochrane Controlled Trials Register. Date of last search: February 2000.
SELECTION CRITERIA: Acceptably controlled comparisons of soft versus rigid vacuum extractor cups.
DATA COLLECTION AND ANALYSIS: Two reviewers assessed trial quality and extracted data. Study authors were contacted for additional information.
MAIN RESULTS: Nine trials involving 1375 women were included. The trials were of average quality. Soft cups are significantly more likely to fail to achieve vaginal delivery (odds ratio 1.65, 95% confidence interval 1.19 to 2.29). However, they were associated with less scalp injury (odds ratio 0.45, 95% confidence interval 0.15 to 0.60). There was no difference between the two groups in terms of maternal injury.
REVIEWER'S CONCLUSIONS: Metal cups appear to be more suitable for 'occipito-posterior', transverse and difficult 'occipito-anterior' position deliveries. The soft cups seem to be appropriate for straightforward deliveries.
R Johanson; V Menon
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  The Cochrane database of systematic reviews     Volume:  -     ISSN:  1469-493X     ISO Abbreviation:  Cochrane Database Syst Rev     Publication Date:  2000  
Date Detail:
Created Date:  2000-07-06     Completed Date:  2000-07-06     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  100909747     Medline TA:  Cochrane Database Syst Rev     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  CD000446     Citation Subset:  IM    
Academic Department of Obstetrics and Gynaecology, North Staffordshire Hospital NHS Trust, Maternity Hospital, Newcastle Road, Stoke-on-Trent, Staffordshire, UK, ST4 6QG.
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MeSH Terms
Vacuum Extraction, Obstetrical / instrumentation*
Update In:
Cochrane Database Syst Rev. 2010;(11):CD000446   [PMID:  21069666 ]

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