Document Detail

Risk factors for shoulder dystocia: an engineering study of clinician-applied forces.
MedLine Citation:
PMID:  1992397     Owner:  NLM     Status:  MEDLINE    
We report on engineering risk factors associated with clinician-applied forces during vaginal delivery of newborns. Specifically, we present and interpret data from a series of experiments using force-sensing devices on 29 randomly selected vaginal births, including two shoulder dystocia deliveries and one birth injury. The results indicate that clinician-applied peak forces are typically about 47 N for routine deliveries, 69 N for difficult deliveries, and 100 N for a shoulder dystocia delivery (P less than .01). The time required to deliver fetal shoulders doubles for nonroutine deliveries (P less than .01). In addition, impulse and rate of application of force distinguish between routine and nonroutine deliveries (P less than .03). We conclude that, if properly perceived, force, force rate, and the duration of force are objective parameters that can be used in recognizing and managing shoulder dystocia and in predicting thresholds for birth injury.
R Allen; J Sorab; B Gonik
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  77     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1991 Mar 
Date Detail:
Created Date:  1991-03-13     Completed Date:  1991-03-13     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  352-5     Citation Subset:  AIM; IM    
Department of Mechanical Engineering, University of Delaware, Newark.
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MeSH Terms
Biophysical Phenomena
Delivery, Obstetric / methods*
Labor Presentation
Risk Factors
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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