Median effective dose (ED50) of intrathecal ropivacaine for labor analgesia initiation in nulliparous vs. multiparous women: an up-down sequential allocation study.

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Title: Median effective dose (ED50) of intrathecal ropivacaine for labor analgesia initiation in nulliparous vs. multiparous women: an up-down sequential allocation study.
Authors: Yan ZR; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Xiao PH; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Liu M; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Huang Y; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Miao LY; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Chen XF; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Zhang LX; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China., Zhang SJ; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China. Electronic address: zhangsujing@fjsfy.com.
Source: International journal of obstetric anesthesia [Int J Obstet Anesth] 2026 May; Vol. 66, pp. 104890. Date of Electronic Publication: 2026 Mar 01.
Publication Type: Journal Article
Journal Info: Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9200430 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1532-3374 (Electronic) Linking ISSN: 0959289X NLM ISO Abbreviation: Int J Obstet Anesth Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: Median effective dose (ED50) of intrathecal ropivacaine for labor analgesia initiation in nulliparous vs. multiparous women: an up-down sequential allocation study.
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  Data: <searchLink fieldCode="AU" term="%22Yan+ZR%22">Yan ZR</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Xiao+PH%22">Xiao PH</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Liu+M%22">Liu M</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Huang+Y%22">Huang Y</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Miao+LY%22">Miao LY</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Chen+XF%22">Chen XF</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Zhang+LX%22">Zhang LX</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China.<br /><searchLink fieldCode="AU" term="%22Zhang+SJ%22">Zhang SJ</searchLink>; Department of Anesthesiology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China. Electronic address: zhangsujing@fjsfy.com.
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  Data: <searchLink fieldCode="JN" term="%229200430%22">International journal of obstetric anesthesia</searchLink> [Int J Obstet Anesth] 2026 May; Vol. 66, pp. 104890. <i>Date of Electronic Publication: </i>2026 Mar 01.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Elsevier%22">Elsevier </searchLink><i>Country of Publication: </i>Netherlands <i>NLM ID: </i>9200430 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1532-3374 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%220959289X%22">0959289X </searchLink><i>NLM ISO Abbreviation: </i>Int J Obstet Anesth <i>Subsets: </i>MEDLINE
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        Value: 10.1016/j.ijoa.2026.104890
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      – Code: eng
        Text: English
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      – TitleFull: Median effective dose (ED50) of intrathecal ropivacaine for labor analgesia initiation in nulliparous vs. multiparous women: an up-down sequential allocation study.
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              M: 05
              Text: 2026 May
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              Y: 2026
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              Value: 66
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