Document Detail

Characteristics of normal labor.
MedLine Citation:
PMID:  2733947     Owner:  NLM     Status:  MEDLINE    
The length of the first and second stages of labor was evaluated in 6991 women with singleton gestations at 37-42 weeks with vertex presentation. All patients delivered spontaneously without the use of oxytocin. Four study groups were created based on parity and whether conduction anesthesia was used. The mean lengths and limits (95th percentile) for the first stage of labor, respectively, were as follows: nulliparas: no anesthesia--8.1 and 16.6 hours, conduction anesthesia--10.2 and 19.0 hours; multiparas: no anesthesia--5.7 and 12.5 hours, conduction anesthesia--7.4 and 14.9 hours. Similar data for the second stage were as follows: nulliparas: no anesthesia--54 and 132 minutes, conduction anesthesia--79 and 185 minutes; multiparas: no anesthesia--19 and 61 minutes, conduction anesthesia--45 and 131 minutes. These statistical parameters are useful for defining when a labor becomes abnormal and intervention should be considered.
S J Kilpatrick; R K Laros
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  74     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1989 Jul 
Date Detail:
Created Date:  1989-07-21     Completed Date:  1989-07-21     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  85-7     Citation Subset:  AIM; IM    
Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco.
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MeSH Terms
Anesthesia, Conduction
Anesthesia, Obstetrical
Labor Stage, First / physiology
Labor Stage, Second / physiology
Labor, Obstetric / physiology*
Reference Values
Grant Support
Comment In:
Obstet Gynecol. 1989 Dec;74(6):973-4   [PMID:  2586966 ]

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