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      The Trend of Labor Analgesia in the World and China: A Bibliometric Analysis of Publications in Recent 30 Years

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          Labor analgesia is part of the most important tasks an anesthesiologist needs to deal with. With the “two-child policy” in China, the number of parturients has increased significantly, labor analgesia more should be valued. There has been a tremendous change on labor analgesia research in China and around the world; however, broader trends in the prevalence and scope of labor analgesia research remain underexplored. The current study quantitatively analyzes trends in labor analgesia research publications in the past 30 years.


          A bibliometric approach was used to search Scopus, PubMed, Web of Science and the China National Knowledge Infrastructure for all labor analgesia-related research articles. The research progress and growing trend were quantitatively analyzed by total publications, research types, research institutions, journal impact factors, and author’s contribution. Total citations frequency, average citations per item and h-index were used for evaluating literature quantity.


          From 1988 to 2018, over 8000 documents in labor analgesia research field were published worldwide. According to Scopus, 68.2% papers of all documents were articles. The USA published the largest number of articles (2204, 27.45%). China had published 175 articles (2.18%), ranking the 11th. According to WOS, there were 221 research categories for labor analgesia articles all over the world. The total citations were 76,207, average 9.086 citations per item, and the h-index was 114, average 14 citations per item worldwide. The total citations and h-index of papers published in China were as follows: 353 total citations, 7.06 citations per item, and 10 h-index. High contribution journals, authors, institutions and the top 10 most cited articles on labor analgesia in the world and China were also listed.


          Labor analgesia research has grown markedly during the 1988–2018 period. Although China had made remarkable achievements, there was a gap in the high-quality studies between China and other leading countries.

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          Most cited references 40

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          Pain and women's satisfaction with the experience of childbirth: a systematic review.

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          To summarize what is known about satisfaction with childbirth, with particular attention to the roles of pain and pain relief. A systematic review of 137 reports of factors influencing women's evaluations of their childbirth experiences. The reports included descriptive studies, randomized controlled trials, and systematic reviews of intrapartum interventions. Results were summarized qualitatively. Four factors-personal expectations, the amount of support from caregivers, the quality of the caregiver-patient relationship, and involvement in decision making-appear to be so important that they override the influences of age, socioeconomic status, ethnicity, childbirth preparation, the physical birth environment, pain, immobility, medical interventions, and continuity of care, when women evaluate their childbirth experiences. The influences of pain, pain relief, and intrapartum medical interventions on subsequent satisfaction are neither as obvious, as direct, nor as powerful as the influences of the attitudes and behaviors of the caregivers.
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            Severe neurological complications after central neuraxial blockades in Sweden 1990-1999.

            Central neuraxial blockades find widespread applications. Severe complications are believed to be extremely rare, but the incidence is probably underestimated. A retrospective study of severe neurologic complications after central neuraxial blockades in Sweden 1990-1999 was performed. Information was obtained from a postal survey and administrative files in the health care system. During the study period approximately 1,260,000 spinal blockades and 450,000 epidural blockades were administered, including 200,000 epidural blockades for pain relief in labor. : The 127 complications found included spinal hematoma (33), cauda equina syndrome (32), meningitis (29), epidural abscess (13), and miscellaneous (20). Permanent neurologic damage was observed in 85 patients. Incidence of complications after spinal blockade was within 1:20-30,000 in all patient groups. Incidence after obstetric epidural blockade was 1:25,000; in the remaining patients it was 1:3600 (P < 0.0001). Spinal hematoma after obstetric epidural blockade carried the incidence 1:200,000, significantly lower than the incidence 1:3,600 females subject to knee arthroplasty (P < 0.0001). : More complications than expected were found, probably as a result of the comprehensive study design. Half of the complications were retrieved exclusively from administrative files. Complications occur significantly more often after epidural blockade than after spinal blockade, and the complications are different. Obstetric patients carry significantly lower incidence of complications. Osteoporosis is proposed as a previously neglected risk factor. Close surveillance after central neuraxial blockade is mandatory for safe practice.
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                Author and article information

                J Pain Res
                J Pain Res
                Journal of Pain Research
                10 March 2020
                : 13
                : 517-526
                [1 ]Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education , Chengdu 610041, People’s Republic of China
                [2 ]Department of Anesthesiology, West China Second University Hospital, Sichuan University , Chengdu 610041, People’s Republic of China
                [3 ]Department of Anesthesiology, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital , Chengdu 610072, People’s Republic of China
                [4 ]Department of Pain Management, West China Hospital, Sichuan University , Chengdu 610041, People’s Republic of China
                Author notes
                Correspondence: Xue-Mei Lin Email xuemeilin__scu@163.com

                These authors contributed equally to this work

                © 2020 Zheng et al.

                This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms ( https://www.dovepress.com/terms.php).

                Page count
                Figures: 4, Tables: 3, References: 45, Pages: 10
                Original Research

                Anesthesiology & Pain management

                china, trend analysis, bibliometric analysis, labor analgesia


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