SYSTEMATIC REVIEW article

Front. Pharmacol., 01 August 2022

Sec. Obstetric and Pediatric Pharmacology

Volume 13 - 2022 | https://doi.org/10.3389/fphar.2022.915698

Developing a Core Outcome Set for the Evaluation of Antibiotic Use in Prelabor Rupture of Membranes: A Systematic Review and Semi-Structured Interview

  • 1. West China School of Pharmacy, Sichuan University, Chengdu, China

  • 2. Department of Pharmacy, West China Second University Hospital, Sichuan University, Chengdu, China

  • 3. Evidence-Based Pharmacy Center, West China Second University Hospital, Sichuan University, Chengdu, China

  • 4. Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, China

  • 5. Department of Obstetrics, West China Second University Hospital, Sichuan University, Chengdu, China

  • 6. West China School of Medicine, Sichuan University, Chengdu, China

  • 7. National Drug Clinical Trial Institute, West China Second University Hospital, Sichuan University, Chengdu, China

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Abstract

Background: Prelabor rupture of membranes (PROM) is associated with maternal and neonatal infections. Although guidelines suggest prophylactic antibiotics for pregnant women with PROM, the optimal antibiotic regimen remains controversial. Synthesizing the data from different studies is challenging due to variations in reported outcomes.

Objective: This study aimed to form the initial list of outcomes for the core outcome set (COS) that evaluates antibiotic use in PROM by identifying all existing outcomes and patients’ views.

Methods: Relevant studies were identified by searching PubMed, EMBASE, Cochrane Library, Chinese National Knowledge Infrastructure, Wanfang, and VIP databases. We also screened the references of the included studies as a supplementary search. We extracted basic information from the articles and the outcomes. Two reviewers independently selected the studies, extracted the data, extracted the outcomes, and grouped them into domains. Then, semi-structured interviews based on the potential factors collected by the systematic review were conducted at West China Second Hospital of Sichuan University. Pregnant women who met the diagnostic criteria for PROM were enrolled. Participants reported their concerns about the outcomes. Two researchers identified the pregnant women’s concerns.

Results: A total of 90 studies were enrolled in this systematic review. The median outcomes in the included studies was 7 (1–31), and 109 different unique outcomes were identified. Pre-term PROM (PPROM) had 97 outcomes, and term PROM (TPROM) had 70 outcomes. The classification and order of the core outcome domains of PPROM and TPROM were consistent. The physiological domain was the most common for PPROM and TPROM outcomes. Furthermore, 35.1 and 57.1% outcomes were only reported once in PPROM and TPROM studies, respectively. Thirty pregnant women participated in the semi-structured interviews; 10 outcomes were extracted after normalized, and the outcomes were reported in the systematic review. However, studies rarely reported pregnant women’s concerns.

Conclusion: There was considerable inconsistency in outcomes selection and reporting in studies about antibiotics in PROM. An initial core outcomes set for antibiotics in PROM was formed.

1 Introduction

Prelabor rupture of membranes (PROM) is a rupture of membranes before the onset of labor, which consists of “pre-term prelabor rupture of membranes (PPROM)” and “term prelabor rupture of membranes (TPROM)” (Siegler et al., 2020). It affects 2.3%–18.7% of pregnancies and increases the risk of intrauterine infection, neonatal sepsis, neonatal pneumonia, etc. (Kenyon et al., 2001a; Martin et al., 2005; Mercer, 2005; Smith et al., 2005; Clark and Varner, 2011; Reuter et al., 2014; Middleton et al., 2017; Zhuang et al., 2020). Although guidelines suggest that the use of prophylactic antibiotics could reduce infection morbidity and improve the outcomes for mothers and newborns, the optimal antibiotic regimen is still controversial (Yudin et al., 2009; Kenyon et al., 2013; Thomson and Royal College of Obstetricians and Gynaecologists, 2019; Chatzakis et al., 2020; Siegler et al., 2020). Despite many studies about the antibiotics regimens for PROM conducted, it is difficult to synthesize their data due to outcome variations. As a recent systematic review shows, only 70.0% (17/20) of the included studies reported the primary outcome. The risk of bias was 35.0% (7/20) and 90.0% (18/20) of the included studies, including risk in “Measurement of outcome” and “Selection of reported result,” respectively (Chatzakis et al., 2020).

A core outcome set (COS), defined as an agreed standardized set of outcomes that should be measured and reported as a minimum, could improve consistency in outcome measurement and reduce outcome reporting bias. A COS would eliminate unnecessary waste in producing and reporting research findings (Williamson et al., 2012). The COS is drawing increasing attention across all health research areas and is referred to as a starting point for outcome selection in the work of some trialists, systematic reviewers, and guideline developers (COS users) (Gorst et al., 2016).

However, there is no COS for antibiotics in PROM or COS for treating or preventing infection in pregnant women. This systematic review and semi-structured interview would form the initial list of outcomes for the COS of antibiotics in PROM by identifying all existing outcomes and patients’ views.

2 Methods

This COS project is registered on the core outcome measures in effectiveness trials (COMET) database, and further details are available at https://www.comet-initiative.org/Studies/Details/1986.

2.1 Systematic Review

The part of the systematic review was performed and reported per the Preferred Reporting Items for Systematic Reviews and Meta‐Analyses guidelines for systematic reviews (Preferred Reporting Items for Systematic Reviews and Meta-Analyses, 2009).

2.1.1 Search Strategy

We conducted an electronic search of PubMed, EMBASE, Cochrane Library, Chinese National Knowledge Infrastructure, Wanfang, and VIP Database from inception to September 2021. The search strategy was adjusted specifically for each database. It combined medical subject headings and free text terms for (“Fetal Membranes, Premature Rupture” “antibiotics” or “Prelabor rupture of membranes”) and (“Anti-Infective Agents” or “antibiotics” or “Penicillins” or” Cephalosporins” or” azithromycin” or” erythromycin” or” Clindamycin” ). Supplementary Table S1 lists the search terms. Citation lists of the included studies were reviewed to identify any intervention reports missed by the search strategy.

2.1.2 Inclusion Criteria

The following studies were included: 1) Participants: pregnant women (no restriction for gestational age) met the diagnostic criteria for PROM according to the guidelines of the Chinese Medical Association, American College of Obstetricians and Gynecologists, Society of Obstetricians & Gynaecologists (SOGC), Royal College of Obstetricians and Gynaecologists (ROGC), etc. 2) Intervention: antibiotics. 3) Type of study: systematic reviews, randomized controlled trials, non-randomized controlled trials, or cohort studies. The following studies were excluded: 1) non-Chinese and non-English literature, 2) unobtainable full-texts.

2.1.3 Data Extraction

Titles and abstracts were independently screened by two reviewers to determine potential eligible studies, and full texts of potentially relevant articles were independently screened by two reviewers to assess for eligibility. Disagreements were resolved by consensus or consulted a third reviewer. Two reviewers independently extracted data from the included studies and cross-checked it. The extracted data included: 1) the basic information of the articles (the first author, published year, study design, country, etc.); 2) the characteristics of participants and interventions; 3) the outcomes reported (names, definitions, and measurements of each outcome).

2.1.4 Assessment of Risk of Bias

There was no assessment of the risk of bias since the purpose of this study was to identify all outcomes reported irrespective of the study quality.

2.1.5 Data Synthesis

All outcomes were extracted verbatim from studies. Variations in the same outcome reporting were revised for consistency, and the composite outcomes were split into unique outcomes by a researcher with clinical experience in obstetrics. Outcome terminologies were assigned to one of the core outcome domains according to the COMET Handbook (Williamson et al., 2017). We calculated the number of unique outcomes for each study and outcome domain, the number of reported studies for each outcome, and the median number of the reported studies for each outcome domain.

2.2 Semi-Structured Interview

According to recommendations of COS-STAndards for Development and COMET handbook (version 1.0) (Kirkham et al., 2016; Williamson et al., 2017), a list of outcomes from published clinical trials may be supplemented with semi-structured interviews with patients. Therefore, we conducted the semi-structured interview to obtain the opinions of patients on PROM treatment.

The semi-structured interview study was conducted at West China Second Hospital of Sichuan University from January to February 2022. The West China Second University Hospital, Sichuan University, provided ethical approval. The participants gave verbal consent before their interviews. The participants’ socioeconomic information of participants came from the hospital information system.

2.2.1 Participants

Pregnant women in West China Second Hospital of Sichuan University, January to February 2022, who met the diagnostic criteria for PROM were enrolled. The exclusion criteria included: 1) pregnant women with serious illnesses who were not suitable to participate in the study; 2) pregnant women with communication difficulties; 3) pregnant women who refused to participate. The sample size was 30 since 30 subjects could achieve data saturation reported in other studies (Keyvanara et al., 2013; Alkadhimi et al., 2020). However, if new information is generated in the final interview, the sample size of the interview will increase.

2.2.2 Procedure

The research team designed a semi-structured interview guide involving open-ended questions (Supplementary). The face-to-face semi-structured interviews took place at the patient’s bedside at mutually convenient times. The researchers would explain the content and purpose of the study to the patients and interview them after obtaining their informed consent. Interviews were digitally audio-recorded using a mobile phone.

2.2.3 Analysis

All the interviews were transcribed literally by a researcher. Our systematic review developed a consensus codebook using a deduction coding process and evaluating the first 10 transcripts to identify emerging codes through an inductive coding process. Each transcript was independently coded by two researchers, and coding inconsistencies were resolved by discussion. Disagreements were resolved by consensus or a discussion in the research group. Data analysis was processed by identifying the codes to judge whether these were new outcomes and whether they should be added to the list of candidate outcomes. We would identify whether these outcomes are new and judge whether they should be added to the list of candidate outcomes.

3 Results

3.1 Systematic Review

3.1.1 Study Characteristics

The search retrieved 6,487 studies. After removing duplicates and irrelevant records by screening the titles and abstracts, 230 studies were assessed for eligibility by full-text screening. Eventually, 90 studies (Chatzakis et al., 2020) were included in this systematic review (Figure 1). These studies were conducted in 17 countries on five continents from 1966 to 2021 (Figure 2). The study designs were comprised of systematic review (7/90, 7.8%) (Mercer and Arheart, 1995; Maymon et al., 1998; Kenyon et al., 2004; Cousens et al., 2010; Wojcieszek et al., 2014; Saccone and Berghella, 2015; Chatzakis et al., 2020), RCTs (32/90, 35.6%) (Brelje and Kaltreider, 1966; Amon et al., 1988; Johnston et al., 1990; McGregor et al., 1991; Kurki et al., 1992; McCaul et al., 1992; Mercer et al., 1992; Lockwood et al., 1993; Ernest and Givner, 1994; Lewis et al., 1995; Almeida et al., 1996; Grable et al., 1996; Lovett et al., 1997; Kenyon et al., 2001b; Ovalle et al., 2002; Lewis et al., 2003; Segel et al., 2003; August Fuhr et al., 2006; Kwak et al., 2013; Nabhan et al., 2014; Zhang, 2014; Kahramanoglu et al., 2016; Mai and He, 2016; Liang, 2018; Zheng, 2018; Pasquier et al., 2019; Siegel et al., 2019; Deng, 2020; Wolf et al., 2020; Chen, 2021; Cong, 2021; Zheng, 2021) and cohort studies (51/90, 56.6%) (A, 2021; Ali, 2020; Bar et al., 2020; Barišić et al., 2017; Bergström, 1991; Chang et al., 2017; Chen et al., 2020; Dotters-Katz et al., 2017; Du, 2016; Du et al., 2019; Du and Zhang, 2020; Ehsanipoor et al., 2008; Feng, 2020; Finneran et al., 2019; Finneran et al., 2017; Fitzgibbon et al., 2021; Siegel et al., 2019; Ke, 2013; Kenyon et al., 2008; Knupp et al., 2022; Kole-White et al., 2021; Lee et al., 2016; Li, 2017; Li, 2020; Lin et al., 2012; Martingano et al., 2020; Navathe et al., 2019; Pan et al., 2018; Pawar and Reddy, 2020; Pierson et al., 2014; Edwards et al., 2020; Ryo et al., 2005; Smith et al., 2015; Song and Han, 2005; Sung et al., 2017; Tai, 2011; Tanaka et al., 2019; Kramer et al., 1996; Wu, 2018; Yeung et al., 2014; Zeng and Lin, 2020; Zhang, 2017; Zhang, 2019;Zhao, 2019a; Zhao,2019b; Zheng et al., 2016; Zhou et al., 2015; Zhou, 2020; Zou, 2021; Zheng et al., 2020). Out of the 90 studies, 78 (86.7%) studies (Ali, 2020; Almeida et al., 1996; Amon et al., 1988; Bar et al., 2000; Bergström, 1991; Chang et al., 2017; Chatzakis et al., 2020; Chen et al., 2020; Chen, 2021; Cong, 2021; Cousens et al., 2010; Lewis et al., 1995; Deng, 2020; Dotters-Katz et al., 2017; Du, 2016; Du et al., 2019; Du and Zhang, 2020; Ehsanipoor et al., 2008; Ernest and Givner, 1994; Feng, 2020; Finneran et al., 2019; Finneran et al., 2017; Fitzgibbon et al., 2021; August et al., 2006; Grable et al., 1996; Siegel et al., 2019; Johnston et al., 1990; Kahramanoglu et al., 2016; Ke, 2013; Kenyon et al., 2001; Kenyon et al., 2004; Knupp et al., 2022; Kole-White et al., 2021; Kurki et al., 1992; Kwak et al., 2013; Lee et al., 2016; Li, 2017; Li, 2020; Li ,2021; Liang, 2018; Lin et al., 2012; Lockwood et al., 1993; Lovett et al., 1997; Siegel et al., 2019; Mai et al., 2016; Martingano et al., 2020; Maymon et al., 1998; McCaul et al., 1992; McGregor et al., 1991; Mercer et al., 1992; Mercer and Arheart, 1995; Lewis et al., 2003; Nabhan et al., 2014; Navathe et al., 2019; Ovalle et al., 2002; Pan et al., 2018; Pasquier et al., 2019; Pawar and Reddy, 2020; Pierson et al., 2014; Edwards et al., 2020; Ryo et al., 2005; Saccone and Berghella, 2015; Segel et al., 2003; Smith et al., 2015; Song et al. 2005; Sung et al., 2017; Tai, 2011; Tanaka et al., 2019; Kramer et al., 1996; Wojcieszek et al., 2014; Wolf et al., 2020; Wu, 2018; Yeung et al., 2014; Zeng and Lin, 2020; Zhang, 2014; Zhang, 2017; Zhang, 2019; Zhao, 2019a; Zhao, 2019b; Zheng et al., 2016; Zheng, 2021; Zhou et al., 2015; Zhou, 2020; Zou, 2021) included PPROM women, 6 (6.7%) studies (Zheng, 2018; A, 2021; Barišić et al., 2017; Tai, 2011; Zhao, 2019a; Zheng et al., 2020) included term PROM women, 4 (4.4%) studies (Kwak et al., 2013; Nabhan et al., 2014; Wojcieszek et al., 2014; Saccone and Berghella, 2015) included both PPROM and term PROM women and 2 (2.2%) studies (Brelje and Kaltreider, 1966; Kenyon et al., 2008) did not report whether the participants were term. The study interventions/comparisons included: 1) using antibiotics vs placebo/blank control (31/90, 34.4%) (Brelje and Kaltreider, 1966; Amon et al., 1988; Johnston et al., 1990; Bergström, 1991; Kurki et al., 1992; McCaul et al., 1992; Mercer et al., 1992; Lockwood et al., 1993; Ernest and Givner, 1994; Mercer and Arheart, 1995; Almeida et al., 1996; Grable et al., 1996; Kramer et al., 1996; Maymon et al., 1998; Bar et al., 2020; Ovalle et al., 2002; Kenyon et al., 2004; Song and Han, 2005; August Fuhr et al., 2006; Cousens et al., 2010; Lin et al., 2012; Ke, 2013; Nabhan et al., 2014; Wojcieszek et al., 2014; Zhang, 2014; Saccone and Berghella, 2015; Du, 2016; Chang et al., 2017; Dotters-Katz et al., 2017; Pasquier et al., 2019; Feng, 2020); 2) different antibiotics (29/90, 32.2%) (McGregor et al., 1991; Lewis et al., 1995; Lovett et al., 1997; Edwards et al., 2020; Kenyon et al., 2001b; Ryo et al., 2005; Ehsanipoor et al., 2008; Kenyon et al., 2008; Kwak et al., 2013; Pierson et al., 2014; Yeung et al., 2014; Kahramanoglu et al., 2016; Lee et al., 2016; Zheng et al., 2016; Finneran et al., 2017; Sung et al., 2017; Wu, 2018; Zhao, 2019b; Finneran et al., 2019; Navathe et al., 2019; Siegel et al., 2019; Tanaka et al., 2019; Ali, 2020; Chatzakis et al., 2020; Martingano et al., 2020; Pawar and Reddy, 2020; Wolf et al., 2020; Fitzgibbon et al., 2021); 3) different timing of antibiotics administration (17/90, 18.9%) (Deng, 2020; Liang, 2018; Zheng, 2018; A, 2021; Barišić et al., 2017; Tai, 2011; Zhao, 2019a; Zheng et al., 2020; Chen et al., 2020; Du et al., 2019; Du and Zhang, 2020; Knupp et al., 2022; Li, 2017; Pan et al., 2018; Zeng and Lin, 2020; Zhang, 2019; Zhou et al., 2015); 4) antibiotics chosen depending on experience vs culture results (8/90, 8.9%) (Mai and He, 2016; Zhang, 2017; Zhou, 2020; Chen, 2021; Cong, 2021; Zheng, 2021; Zou, 2021); 5) different courses of antibiotics administration (4/90, 4.4%) (Lewis et al., 2003; Segel et al., 2003; Smith et al., 2015; Li, 2020); 6) different administration route (1/90, 1.1%) (Kole-White et al., 2021). The median number of the outcomes in the included studies was 7, with the range 1–31. Only 38.9% (35/90) studies (Chatzakis et al., 2020; Saccone and Berghella, 2015; Amon et al., 1988; Brelje and Kaltreider, 1966; Lewis et al., 1995; Ernest and Givner, 1994; Grable et al., 1996; Siegel et al., 2019; Kahramanoglu et al., 2016; Kenyon et al., 2001b; Kurki et al., 1992; Kwak et al., 2013; Lockwood et al., 1993; Mercer et al., 1992; Nabhan et al., 2014; Pasquier et al., 2019; Segel et al., 2003; A, 2021; Zhao, 2019a; Zheng et al., 2020; Kenyon et al., 2008; Bar et al., 2020; Chang et al., 2017; Dotters-Katz et al., 2017; Kramer et al., 1996; Ehsanipoor et al., 2008; Fitzgibbon et al., 2021; Martingano et al., 2020; Pierson et al., 2014; Sung et al., 2017; Zheng et al., 2016; Knupp et al., 2022; Smith et al., 2015; Kole-White et al., 2021) defined study outcomes and 3.3% (3/90) studies (Kenyon et al., 2008; Kwak et al., 2013; Chang et al., 2017) explained how to measure the outcomes. 16.7% (15/90) of studies used composite outcomes (Lockwood et al., 1993; Kenyon et al., 2001b; Segel et al., 2003; Kenyon et al., 2008; Kwak et al., 2013; Wojcieszek et al., 2014; Smith et al., 2015; Kahramanoglu et al., 2016; Zheng et al., 2016; Chang et al., 2017; Zhao, 2019a; Pasquier et al., 2019; Siegel et al., 2019; Zheng et al., 2020; Knupp et al., 2022). Supplementary Table S2 shows the study characteristics.

FIGURE 1

FIGURE 2

3.1.2 Outcomes Reported in the Studies

Extraction of each verbatim outcome domain from each study, a total of 784 verbatim outcomes were identified. After merging outcomes with similar definitions and removing duplicates, we had 109 unique outcomes. Of those, 76.1% (83/109) of outcomes were not clearly defined and often had different definitions for the same term. For example, the definition of “latency period” was provided in 11 studies (Lockwood et al., 1993; Ernest and Givner, 1994; Grable et al., 1996; Pierson et al., 2014; Smith et al., 2015; Chang et al., 2017; Dotters-Katz et al., 2017; Sung et al., 2017; Siegel et al., 2019; Fitzgibbon et al., 2021; Kole-White et al., 2021); however, some studies meant “time from the first dose of antibiotics to delivery” (Pierson et al., 2014; Sung et al., 2017; Kole-White et al., 2021) and other studies meant “from the day of rupture of membranes to the date of delivery” (Lockwood et al., 1993; Ernest and Givner, 1994; Grable et al., 1996; Smith et al., 2015; Chang et al., 2017; Dotters-Katz et al., 2017; Siegel et al., 2019; Fitzgibbon et al., 2021).

Since the antibiotics strategy dramatically differs between PPROM and TPROM, we analyzed these subsets of pregnancy complications separately. Outcomes were categorized according to the populations in the studies reporting these outcomes, with PPROM having more outcomes than TPROM, 97 and 70, respectively.

The 97 outcomes for PPROM were grouped into maternal outcomes and neonatal outcomes. Maternal outcomes involved 33 outcomes categorized into six core domains (physiological, infection, resource use, death, adverse events, and function, from most to least). Neonatal outcomes involved 64 outcomes categorized into six core domains (physiological, resource use, infection, death, quality of life, and function, from most to least) (Figure 3). The physiological domain was the most common for maternal and neonatal outcomes, with the 51.5% (17/33) and 60.9% (39/64) outcomes falling into it, respectively.

FIGURE 3

Table 1 presents outcomes for PPROM with the number of reported studies (reported frequencies). Figure 3 ranks the outcome domains by median reported frequencies from high to low. The rank for maternal outcome domains were infection, death, adverse events, physiological, function and resource use, and for neonatal domains were death, infection, resource use, physiological, quality of life, and function. Across all maternal outcomes, the top three most frequently reported outcomes were chorioamnionitis, pregnancy latency period, and mode of delivery, reported in 47.8% (43/90), 45.6% (41/90), and 30.0% (27/90), respectively of the including studies. The top three most frequently reported outcomes for newborns were neonatal sepsis, neonatal deaths, and birth weight, reported in 38.9% (35/90), 37.8% (34/90), and 36.7% (33/90) of the included studies. Nevertheless, 35.1% of outcomes (34/97, eight maternal and 26 neonatal outcomes) were reported only once in the related studies.

TABLE 1

Outcome domainOutcomeNumber of reported studiesDefinitionParticipants’ views
PROM (97)
Physiological (17/97)Latency period41 (Johnston et al. (1990); Bergström, (1991); McGregor et al. (1991); McCaul et al. (1992); Lockwood et al. (1993); Ernest and Givner, 1994; Lewis et al. (1995); Mercer and Arheart, (1995); Almeida et al. (1996); Grable et al. (1996); Lovett et al. (1997); Maymon et al. (1998); Bar et al. (2020); Kenyon et al. (2001b); Lewis et al. (2003); Segel et al. (2003); Kenyon et al. (2004); Ryo et al. (2005); August Fuhr et al. (2006); Pierson et al. (2014); Saccone and Berghella, (2015); Smith et al. (2015); Kahramanoglu et al. (2016); Mai and He, (2016); Chang et al. (2017); Dotters-Katz et al. (2017); Finneran et al. (2017); Sung et al. (2017); Wu, (2018); Du et al. (2019); Navathe et al. (2019); Siegel et al. (2019); Zhang, (2019); Chatzakis et al. (2020); Du and Zhang, (2020); Martingano et al. (2020); Pawar and Reddy, (2020); Zeng and Lin, (2020); Fitzgibbon et al. (2021); Kole-White et al. (2021); Knupp et al. (2022))√ (Lockwood et al. (1993); Ernest and Givner, (1994); Grable et al. (1996); Pierson et al. (2014); Smith et al. (2015); Chang et al. (2017); Dotters-Katz et al. (2017); Sung et al. (2017); Siegel et al. (2019); Fitzgibbon et al. (2021); Kole-White et al. (2021))
Mode of delivery27 Brelje and Kaltreider, (1966); Johnston et al., 1990; Lewis et al. (1995); Grable et al. (1996); Bar et al. (2020); Kenyon et al. (2001b); Ke, (2013); Lee et al. (2016); Finneran et al. (2017); Ali, (2020); Feng, (2020); Chen, (2021); Fitzgibbon et al. (2021)
Postpartum hemorrhage22 Lin et al. (2012); Nabhan et al. (2014); Wojcieszek et al. (2014); Zhou et al. (2015); Li, (2017); Zhang, (2017); Pan et al. (2018); Zhao, (2019b); Du et al. (2019); Chen et al. (2020); Deng, (2020); Du and Zhang, (2020); Feng, (2020); Li, (2020); Zeng and Lin, (2020); Zhou, (2020); Chen, (2021); Cong, (2021); Zheng, (2021); Zou, (2021); Knupp et al. (2022))
Preterm delivery6 Brelje and Kaltreider, (1966); Lee et al. (2016); Feng, (2020)
Maternal white blood cell count4 (Kahramanoglu et al. (2016); Liang, (2018); Wu, (2018); Fitzgibbon et al. (2021))
Placental abruption4 (Mercer et al. (1992); Lewis et al. (1995); Saccone and Berghella, (2015); Pawar and Reddy, (2020)
Deep vein thrombosis3 Dotters-Katz et al. (2017); Ali (2020); Knupp et al. (2022)√ (Dotters-Katz et al. (2017))
Maternal c-reactive protein3 Kahramanoglu et al. (2016); Liang, (2018); Wu, (2018)
Fever2 Wojcieszek et al. (2014); Kahramanoglu et al. (2016)Wojcieszek et al. (2014)
Maternal intensive care unit admission2 Wojcieszek et al. (2014); Fitzgibbon et al. (2021)
Meconium-stained amniotic fluid2 Feng, (2020); Martingano et al. (2020)
Amniotic fluid index2 (Lewis et al. (1995); Kahramanoglu et al. (2016))
Cardiac arrest1 (Wojcieszek et al. (2014))
Cord prolapse1 Saccone and Berghella, (2015)
Reason for delivery1 Finneran et al. (2017)
Respiratory arrest1 Wojcieszek et al. (2014)
Trophoblastic hyperplasia1 Ovalle et al. (2002)
 Infection (7/97)Chorioamnionitis43 Brelje and Kaltreider, (1966); Amon et al. (1988); Johnston et al. (1990); Kurki et al. (1992); Grable et al. (1996); Bar et al. (2020); Kenyon et al. (2004); Ehsanipoor et al. (2008); Du, (2016); Lee et al. (2016); Siegel et al. (2019); Ali (2020); Chatzakis et al. (2020); Deng, (2020); Chen, (2021); Cong, (2021); Knupp et al. (2022))√ (Amon et al. (1988); Kurki et al. (1992); Mercer et al. (1992); Grable et al. (1996); Ehsanipoor et al. (2008); Wojcieszek et al. (2014); Zheng et al. (2016); Pasquier et al. (2019); Martingano et al. (2020))
Endometritis18 Brelje and Kaltreider, (1966); Amon et al. (1988); Johnston et al. (1990); Kurki et al. (1992); Mercer et al. (1992); Ernest and Givner, (1994); Grable et al. (1996); Kramer et al. (1996); Maymon et al. (1998); Edwards et al. (2020); Segel et al. (2003); Ehsanipoor et al. (2008); Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015); Martingano et al. (2020); Knupp et al. (2022)Amon et al. (1988); Mercer et al. (1992); Ernest and Givner, (1994); Grable et al. (1996); Kramer et al. (1996); Ehsanipoor et al. (2008); Wojcieszek et al. (2014); Martingano et al. (2020)
Puerperal infection18 Mercer and Arheart, (1995); Zhou et al. (2015);Li, (2017); Zhang, (2017); Pan et al. (2018); Zhao, (2019b); Du et al. (2019); Ali (2020); Chen et al. (2020); Du and Zhang, (2020); Feng, (2020); Li, (2020); Zeng and Lin, (2020); Zhou, (2020); Chen, (2021); Cong, (2021); Zheng, (2021); Zou, (2021)
Intrauterine infection13 Ernest and Givner, (1994); Ovalle et al. (2002); Zhou et al. (2015); Du, (2016); Finneran et al. (2017); Li, (2017); Liang, (2018); Wu, (2018); Du et al. (2019); Deng, (2020); Du and Zhang, (2020); Feng, (2020); Li, (2020)Ernest and Givner, (1994)
Maternal sepsis11 Johnston et al. (1990); Kurki et al. (1992); Mercer et al. (1992); Song and Han, (2005); Wojcieszek et al. (2014); Saccone and Berghella, (2015); Finneran et al. (2017); Sung et al. (2017); Siegel et al. (2019); Pawar and Reddy, (2020); Knupp et al. (2022)Wojcieszek et al. (2014)
Maternal infection3 (McCaul et al. (1992); Mai and He, (2016); Zhang, (2019)
Wound infection2 Wojcieszek et al. (2014); Knupp et al. (2022)
 Resource use (5/97)Length of maternal hospitalization8 (Johnston et al. (1990); Lockwood et al. (1993); Almeida et al. (1996); Lovett et al. (1997); Kenyon et al. (2001b); Nabhan et al. (2014); Wojcieszek et al. (2014); Kahramanoglu et al. (2016))
Steroid administration3 (Bar et al. (2020); Kahramanoglu et al. (2016); Chang et al. (2017))
Postpartum antibiotic administration2 (Kenyon et al. (2001b); Wojcieszek et al. (2014))
Tocolysis administration1 (Kahramanoglu et al. (2016))
Cost1 (Finneran et al. (2019))
 Adverse events (2/97)Adverse drug reaction5 (Nabhan et al. (2014); Pierson et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, 2015; Sung et al. (2017))
Anaphylaxis1 (Wojcieszek et al. (2014))
 Death (2/97)Maternal deaths3 (Wojcieszek et al. (2014); Zhang, (2017); Knupp et al. (2022))
 Function (1/97)Breastfeeding2 (Wojcieszek et al. (2014); Saccone and Berghella, (2015)
 Physiological (39/97)Birth weight33 Johnston et al. (1990); Bergström, (1991); Ernest and Givner, (1994); Lewis et al. (1995); Almeida et al. (1996); Grable et al. (1996); Bar et al. (2020); Kenyon et al. (2001b); Kwak et al. (2013); Du, 2016; Kahramanoglu et al. (2016); Lee et al. (2016); Chang et al. (2017); Chen, (2021); Knupp et al. (2022)
Respiratory distress syndrome32 Johnston et al. (1990); Lewis et al. (1995); Grable et al. (1996); Bar et al. (2020); Kenyon et al. (2001b); August Fuhr et al. (2006); Ehsanipoor et al. (2008); Cousens et al. (2010); Ke, (2013); Kwak et al. (2013); Kahramanoglu et al. (2016); Lee et al. (2016); Chang et al. (2017); Finneran et al. (2017); Chatzakis et al. (2020); Knupp et al. (2022)Grable et al. (1996); Ehsanipoor et al. (2008)
Apgar score30 Brelje and Kaltreider, (1966); Johnston et al. (1990); Kurki et al. (1992); Mercer et al. (1992); Lockwood et al. (1993); Grable et al. (1996); Lovett et al. (1997); Bar et al. (2020); Lewis et al. (2003); Kwak et al. (2013); Nabhan et al. (2014); Pierson et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, 2015; Zhou et al. (2015); Du, (2016); Kahramanoglu et al. (2016); Finneran et al. (2017); Li, (2017); Sung et al. (2017); Wu, (2018); Du et al. (2019); Navathe et al. (2019); Tanaka et al. (2019); Zhang, (2019); Du and Zhang, (2020); Li, (2020); Wolf et al. (2020); Zeng and Lin, (2020); Fitzgibbon et al. (2021)
Necrotising enterocolitis27 (Johnston et al. (1990); Grable et al. (1996); Bar et al. (2020); Kenyon et al. (2001b); Segel et al. (2003); August Fuhr et al. (2006); Ehsanipoor et al. (2008); Cousens et al. (2010); Kwak et al. (2013); Lee et al. (2016); Chang et al. (2017); Finneran et al. (2017); Pasquier et al. (2019); Siegel et al. (2019); Chatzakis et al. (2020); Knupp et al. (2022))Grable et al. (1996); Kenyon et al. (2001b); Ehsanipoor et al. (2008); Siegel et al. (2019)
Neonatal pneumonia19 McGregor et al. (1991); Mercer et al. (1992); Mercer and Arheart, (1995); Ehsanipoor et al. (2008); Lin et al. (2012); Ke, (2013); Nabhan et al. (2014); Wojcieszek et al. (2014); Zhang, (2014); Smith et al. (2015); Kahramanoglu et al. (2016); Zhang, (2017); Zhao, (2019b); Feng, (2020); Zeng and Lin, (2020); Zhou, (2020); Chen, (2021); Zheng, (2021); Zou, (2021)Ehsanipoor et al. (2008)
Neonatal infection15 Brelje and Kaltreider, (1966); Amon et al. (1988); Ernest and Givner, (1994); Lewis et al. (1995); Bar et al. (2020); Kenyon et al. (2004); August Fuhr et al. (2006); Saccone and Berghella, (2015); Smith et al. (2015); Du, (2016); Chang et al. (2017); Chatzakis et al. (2020); Feng, (2020); Wolf et al. (2020); Zeng and Lin, (2020)Brelje and Kaltreider, (1966); Amon et al. (1988); Lewis et al. (1995); Bar et al. (2020); Smith et al. (2015)
Bronchopulmonary dysplasia11 Kurki et al. (1992); Ehsanipoor et al. (2008); Kwak et al. (2013); Lee et al. (2016); Chang et al. (2017); Siegel et al. (2019); Knupp et al. (2022)Ehsanipoor et al. (2008)
Neonatal asphyxia9 Ke, (2013); Zhang, (2014); Liang, (2018); Pan et al. (2018); Zhao, (2019b); Zhang, (2019); Chen et al. (2020); Du and Zhang, (2020); Feng, (2020)
Periventricular leukomalacia9 Lee et al. (2016); Chang et al. (2017); Siegel et al. (2019)
Cerebral palsy7 Kenyon et al. (2008); Lee et al. (2016); Siegel et al. (2019)
Fetal distress7 (Mercer et al. (1992); Lin et al. (2012); Pan et al. (2018); Zhao, 2019b; Chen et al. (2020); Du and Zhang, 2020; Feng, 2020)
Cord arterial pH4 (Johnston et al. (1990); Lockwood et al. (1993); Grable et al. (1996); Wolf et al. (2020))
Neonatal icterus4 Lin et al. (2012); Kahramanoglu et al. (2016); Pan et al. (2018); Feng, (2020)
Retinopathy of prematurity4 Song and Han, (2005); Kwak et al. (2013); Chang et al. (2017)
Abnormal brain sonography3 Kenyon et al. (2004); Kwak et al. (2013); Saccone and Berghella, (2015)Saccone and Berghella, (2015)
Neonatal fever2 Smith et al. (2015); Knupp et al. (2022)
Neurological outcome2 Kwak et al. (2013); Chang et al. (2017)Chang et al. (2017)
Patent ductus arteriosus2 Lewis et al. (1995); Tanaka et al. (2019)
Respiratory problems2 Kenyon et al. (2008); Saccone and Berghella, (2015)Kenyon et al. (2008)
Seizures2 Kenyon et al. (2008); Knupp et al. (2022)
Small for gestational age2 Johnston et al. (1990); McGregor et al. (1991)
Abnormal hearing screen1 Tanaka et al. (2019)
Bowel disorders1 Kenyon et al. (2008)
Chronic lung disease1 Kenyon et al. (2001b)
Conjunctivitis1 McGregor et al. (1991)
Diabetes1 Kenyon et al. (2008)
Fetal placental vascular lesions1 Ovalle et al. (2002)
Hypoxic ischemic encephalopathy1 Zhang, (2014)
Neonatal group B streptococcus colonization1 Yeung et al. (2014)
Neonatal group B streptococcus infection1 Yeung et al. (2014)
Neonatal scleredema1 Zhang, (2014)
neonatal white cell count1 Fitzgibbon et al. (2021)
Patent ductus arteriosus ligated1 Tanaka et al. (2019)
Persistent fetal circulation1 Grable et al. (1996)Grable et al. (1996)
Postnatal steroid requirement1 Tanaka et al. (2019)
Pulmonary hypoplasia1 Knupp et al. (2022)
Skeletal deformities1 Kurki et al. (1992)
Transient tachypnea of the newborn1 Kahramanoglu et al. (2016)
Weight gain1 Johnston et al. (1990)
 Resource use (13/97)Admission to the neonatal intensive care unit9 Lewis et al. (1995); Kenyon et al. (2001b); Lewis et al. (2003); Kwak et al. (2013); Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015); Kahramanoglu et al. (2016); Chatzakis et al. (2020)
Duration of hospitalization of the newborns9 McCaul et al. (1992); Mercer et al. (1992); Almeida et al. (1996); Wojcieszek et al. (2014); Saccone and Berghella, (2015); Liang, 2018; Navathe et al. (2019); Tanaka et al. (2019); Wolf et al. (2020)
Duration of stay in the neonatal intensive care unit7 Johnston et al. (1990); Lockwood et al. (1993); Kwak et al. (2013); Nabhan et al. (2014); Wojcieszek et al. (2014); Finneran et al. (2017); Knupp et al. (2022)
Duration of ventilation5 Lewis et al. (1995); Lovett et al. (1997); Kwak et al. (2013); Nabhan et al. (2014); Tanaka et al. (2019)
Mechanical ventilation requirement5 Kurki et al. (1992); Lovett et al. (1997); Kenyon et al. (2001b); Kwak et al. (2013); Wojcieszek et al. (2014)
Oxygen requirement4 Lewis et al. (1995); Lovett et al. (1997); Kenyon et al. (2001b); Pasquier et al. (2019)
Antibiotic therapy requirement3 Wojcieszek et al. (2014); Saccone and Berghella, 2015; Wolf et al. (2020)
Hospital admission3 McGregor et al. (1991); Lewis et al. (1995); Kenyon et al. (2008)
Duration of antibiotics2 Johnston et al. (1990); Tanaka et al. (2019)
Duration of oxygen requirement2 Lewis et al. (1995); Lovett et al. (1997)
Surfactant requirement2 Kenyon et al. (2001b); Tanaka et al. (2019)
Internal fetal monitoring1 Wojcieszek et al. (2014)
Neonatal respiratory support1 Wolf et al. (2020)
 Infection (5/97)Neonatal sepsis35 Johnston et al. (1990); Kurki et al. (1992); Kenyon et al. (2001b); Cousens et al. (2010); Kwak et al. (2013); Kahramanoglu et al. (2016); Lee et al. (2016); Chang et al. (2017); Siegel et al. (2019); Chen et al. (2020); Knupp et al. (2022)√ (Kramer et al. (1996); Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015); Martingano et al. (2020)
Intraventricular haemorrhage26 Johnston et al. (1990); Lewis et al. (1995); Grable et al. (1996); Bar et al. (2020); August Fuhr et al. (2006); Cousens et al. (2010); Kwak et al. (2013); Lee et al. (2016); Chang et al. (2017); Siegel et al. (2019); Chatzakis et al. (2020); Knupp et al. (2022)Grable et al. (1996); Siegel et al. (2019)
Funisitis3 Lee et al. (2016)Zheng et al. (2016)
Neonatal meningitis1 Wojcieszek et al. (2014)
Intracranial infection1 Zeng and Lin, (2020)
 Death (4/97)Neonatal deaths34 Brelje and Kaltreider, (1966); Johnston et al. (1990); Bergström, (1991); Kurki et al. (1992); Bar et al. (2020); Kenyon et al. (2001b); Kenyon et al. (2008); Cousens et al. (2010); Ke, (2013); Kwak et al. (2013); Kahramanoglu et al. (2016); Lee et al. (2016); Dotters-Katz et al. (2017); Finneran et al. (2017); Siegel et al. (2019); Chatzakis et al. (2020); Knupp et al. (2022)
Perinatal death10 McGregor et al. (1991); Kurki et al. (1992); Maymon et al. (1998); Lewis et al. (2003); Kenyon et al. (2004); Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, 2015; Zhao, (2019b); Chatzakis et al. (2020)Chatzakis et al. (2020)
Stillbirth5 Johnston et al. (1990); Bergström, (1991); Kurki et al. (1992); Mercer et al. (1992); Wojcieszek et al. (2014)
Neonatal deaths due to infection1 Mercer et al. (1992)
 Quality of life (2/97)Health-related quality-of-life and behavior1 Kenyon et al. (2008)
Developmental problems1 Kenyon et al. (2008)Kenyon et al. (2008)
 Function (1/97)Functional impairment1 Kenyon et al. (2008)
 TPROM (70)
 Physiological (14/70)Mode of delivery5 Brelje and Kaltreider, (1966); Tai, (2011); Nabhan et al. (2014); Saccone and Berghella, (2015)
Postpartum hemorrhage5 Wojcieszek et al. (2014); Nabhan et al. (2014); A, (2021); Tai, (2011); Zheng et al. (2020)A, (2021)
Latency period2 Saccone and Berghella, (2015); Barišić et al. (2017)
Preterm delivery2 Brelje and Kaltreider, (1966); Saccone and Berghella, (2015)
Temperature2 Zhao, (2019a); Zheng et.al. (2016); Zheng, (2018); Zheng et.al. (2020)
Abnormalities in blood routine1 Zhao, (2019a)
Maternal neutrophil percentage1 Zheng et al. (2020)
Maternal procalcitonin1 Zheng et al. (2020)
Maternal white blood cell count1 Zheng et al. (2020)
Maternal c-reactive protein1 Zheng et al. (2020)
Cord prolapse1 Saccone and Berghella, (2015)
Fever1 Wojcieszek et al. (2014)Wojcieszek et al. (2014)
Placental abruption1 Saccone and Berghella, (2015)
Respiratory arrest1 (Wojcieszek et al. (2014))
 Infection (7/70)Chorioamnionitis8 Saccone and Berghella, (2015); Wojcieszek et al. (2014); Brelje and Kaltreider, (1966); Nabhan et al. (2014); Zheng, (2018); A, (2021); Barišić et al. (2017); Zheng et al. (2020)Wojcieszek et al. (2014); A, (2021)
Endometritis4 Brelje and Kaltreider, (1966); Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015)Wojcieszek et al. (2014)
Puerperal infection3 A, (2021); Tai, (2011); Zheng et al. (2020)A, (2021)
Maternal sepsis2 Wojcieszek et al. (2014); Saccone and Berghella, (2015)Wojcieszek et al. (2014)
Wound infection2 Wojcieszek et al. (2014); Wolf et.al. (2020); Wu, (2018); Yeung et.al. (2014); Zeng and Lin, (2020); Zhang, (2014); Zhang, (2017); Zhang, (2019); Zhoa, (2019a); Zhoa, (2019b)
Urinary tract infection1 Zheng et al. (2020)
Vaginitis1 Zheng et al. (2020)
 Resource use (6/70)Length of maternal hospitalization2 Nabhan et al. (2014); Wojcieszek et al. (2014)
Maternal intensive care unit admission1 Wojcieszek et al. (2014)
Postpartum antibiotic administration1 Wojcieszek et al. (2014)
Anaphylaxis1 Wojcieszek et al. (2014)
Cardiac arrest1 Wojcieszek et al. (2014)
 Death (1/70)Maternal deaths1 Wojcieszek et al. (2014)
 Adverse events (1/70)Adverse drug reaction3 Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015)
 Function (1/70)Breastfeeding2 (Wojcieszek et al. (2014); Saccone and Berghella, (2015)
 Physiological (22/70)Apgar score6 Saccone and Berghella, (2015); Wojcieszek et al. (2014); Brelje and Kaltreider, (1966); Kwak et al. (2013); Nabhan et al. (2014); A, (2021)A, (2021)
Fetal distress3 Zheng, (2018); A, (2021); Tai, (2011)A, (2021)
Abnormal brain sonography2 Kwak et al. (2013); Saccone and Berghella, (2015)Saccone and Berghella, (2015)
Cerebral palsy2 Kenyon et al. (2008); Saccone and Berghella, (2015)
Respiratory distress syndrome2 (Kwak et al. (2013); Wojcieszek et al. (2014))
Respiratory problems2 Kenyon et al. (2008); Saccone and Berghella, (2015)Kenyon et al. (2008)
Baby gender1 Kwak et al. (2013)
Birth weight1 Kwak et al. (2013)
Bowel disorders1 Kenyon et al. (2008)
Bronchopulmonary dysplasia1 Kwak et al. (2013)
Cord arterial pH1 Zheng et al. (2020)
Diabetes1 Kenyon et al. (2008)
Intraventricular haemorrhage1 Kwak et al. (2013)
Necrotising enterocolitis1 Kwak et al. (2013)
Neonatal asphyxia1 Zheng et al. (2018)
Neonatal c-reactive protein1 Barišić et al. (2017)
Neonatal lung injury1 Zheng, (2018)
Neonatal procalcitonin1 Zheng et al. (2020)
Neonatal white blood cell count1 Zheng et al. (2020)
Neurological outcome1 Kwak et al. (2013)
Retinopathy of prematurity1 Kwak et al. (2013)
Seizures1 Kwak et al. (2013)
 Resource use (9/70)Admission to the neonatal intensive care unit5 Kwak et al. (2013); Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015); Barišić et al. (2017))
Antibiotic therapy requirement3 Wojcieszek et al. (2014); Saccone and Berghella, (2015); Barišić et al. (2017)
Duration of hospitalization of the newborns3 Wojcieszek et al. (2014); Saccone and Berghella, (2015); Barišić et al. (2017)
Duration of stay in the neonatal intensive care unit3 Kwak et al. (2013); Nabhan et al. (2014); Wojcieszek et al. (2014)
Hospital admission2 Kenyon et al. (2008); Knupp et. al. (2022);Kole-White et.al. (2021); Kurki et.al. (1992); Kwak et al. (2013); Lee et.al. (2016)Kenyon et al. (2008)
Mechanical ventilation requirement2 Kwak et al. (2013); Wojcieszek et al. (2014)
Duration of ventilation1 Nabhan et al. (2014)
Duration of ventilator treatment1 Kwak et al. (2013)
Internal fetal monitoring1 Wojcieszek et al. (2014)
 Infection (4/70)Neonatal sepsis5 Saccone and Berghella, (2015); Wojcieszek et al. (2014); Kwak et al. (2013); Nabhan et al. (2014); A, (2021)Saccone and Berghella, (2015); Wojcieszek et al. (2014); Nabhan et al. (2014); A, (2021)
Neonatal pneumonia4 Tai, (2011); Nabhan et al. (2014); Wojcieszek et al. (2014); Zheng, (2018)
Neonatal infection3 Saccone and Berghella, (2015); Brelje and Kaltreider, (1966); A, (2021)Brelje and Kaltreider, (1966); A, (2021)
Neonatal meningitis1 Wojcieszek et al. (2014)
 Death (3/70)Neonatal deaths4 Brelje and Kaltreider, (1966); Kenyon et al. (2008); Kwak et al. (2013); Wojcieszek et al. (2014)
Perinatal death3 Nabhan et al. (2014); Wojcieszek et al. (2014); Saccone and Berghella, (2015)
Stillbirth1 Wojcieszek et al. (2014)
 Quality of life (2/70)Health-related quality-of-life and behavior1 Kenyon et al. (2008)
Developmental problems1 Kenyon et al. (2008)Kenyon et al. (2008)
 Function (1/70)Functional impairment1 Kenyon et al. (2008)

The initial outcomes list of COS for antibiotics in PROM.

The 70 outcomes for TPROM were divided into maternal outcomes and neonatal outcomes. Maternal outcomes included 29 outcomes and were classified into six core domains, while neonatal outcomes included 41 outcomes classified into six core domains. Besides, the order of domains is the same as for PPROM (Figure 3). The physiological domain was the most common for both maternal and neonatal outcomes, with the 48.3% (14/29) and 53.7% (22/41) outcomes belonging to it, respectively.

Table 1presents the outcomes for TPROM and the number of reported studies. The rank for maternal outcome domains by reported frequencies were adverse events, infection, function, death, physiological, and resource use, and for neonatal domains were infection, death, resource use, physiological, and quality of life (Figure 3). The top three most frequently reported maternal outcomes were chorioamnionitis, postpartum hemorrhage, and mode of delivery, reported in 8.9% (8/90), 5.6% (5/90), and 5.6% (5/90), respectively of the included studies. And the top three most frequently reported neonatal outcomes were Apgar score, neonatal sepsis, and admission to the neonatal intensive care unit, reported in 6.7% (6/90), 5.6% (5/90), and 5.6% (5/90) of the including studies. Nevertheless, 57.1% of outcomes (40/70, 16 maternal and 24 neonatal outcomes) were reported only once in the related studies.

3.2 Semi-structured Interview

From January 2022 to February 2022, 30 pregnant women took part in the interviews. Their socioeconomic information is in Supplementary Table S3. Two researchers extracted 10 outcomes after normalization, and no new outcomes were obtained (Figure 4). The most frequently reported outcomes by PROM pregnant women were intrauterine infection (43.3%, 13/30), followed by latency period (40.0%, 12/30), fetal distress (20.0%, 6/30), and health-related quality of life and behavior (20.0%, 6/30).

FIGURE 4

Discussion

To our knowledge, this is the first study to investigate study outcomes and the concerns of pregnant women on antibiotics in PROM. Our study showed a growing number of studies about antibiotics used in PROM; however, a significant inconsistency appeared in outcomes reported in antibiotics used in pregnant women with PROM. Firstly, the current studies reported many different outcomes, some of which were only reported once. Moreover, many outcomes were not clearly defined, and different definitions were frequently found for the same term. Therefore, it might not be possible to compare, contrast or combine the results of the individual studies in a systematic review to provide higher-level evidence for clinical practice (Clarke and Williamson, 2016), which contributes to waste in research (Glasziou et al., 2014). The development of the COS for antibiotics in PROM could improve the research quality of PROM and provide a reference for research about the infection in pregnant women.

Although the classification and order of the core outcome domains of PPROM and TPROM were consistent, there were some differences between the specific outcomes of PPROM and TPROM studies due to the different clinical stages of PPROM and TPROM. For example, neonatal death was one of the most concerned outcomes of PPROM researchers. However, this outcome was seldom reported in TPROM studies because pre-term birth complications are the leading cause of death among children (World Health Organization, 2018).

The outcomes identified in the including studies could cover the outcomes concerned by pregnant women. The physiological domain contained the most outcomes. Despite this, many outcomes were reported only once in studies or by pregnant women. Both the PPROM studies’ researchers and the pregnant women interviewed were very concerned about the latency period. During the latency period of PROM, the fetus would be exposed to the risk of maternofetal infection, abruptio placentae, cord prolapse, and intrauterine death (Mercer, 2003). However, a large cohort study suggested that prolonged latency duration did not worsen neonatal prognosis. Moreover, survival and survival without severe morbidity improved with increased gestational age at birth (Lorthe et al., 2017). Therefore, prolonging latency if there is no contraindication was recommended in pregnant women at 24 0/7–33 6/7 weeks of gestation (Siegler et al., 2020). Nevertheless, some pregnant women’s concerns, such as health-related quality of life and behavior, were rarely reported in the studies. This kind of outcome is used to assess the effect of chronic disease management on an individual’s health status and is drawing the attention of researchers and policymakers (Guyatt et al., 1993). Although PROM is not a chronic disease, the sequelae of premature infants, according to PROM, require constant attention as many pre-term children develop important behavioral and educational difficulties (Bhutta et al., 2002). Future studies could pay attention to these outcomes.

Limitation and Future Research

Firstly, our study only included articles in Chinese and English, which could have a language limitation. Besides, the semi-structured interview was conducted at a single center, which could have limitations to sample representativeness. Therefore, in the next stage of this COS research, we would conduct a Delphi survey with stakeholder groups, which were based on multicenter, to add important outcomes not identified by our current study and prioritize outcomes for the COS.

Conclusion

An initial list of core outcomes set for antibiotics in pregnant women with prelabor rupture of membranes is formed. We identified 109 outcomes from 90 studies and a semi-structured interview. There was considerable inconsistency in outcomes selection and reporting in current studies for antibiotics in PROM. These results provide a robust foundation for the development of a COS.

Statements

Data availability statement

The original contributions presented in the study are included in the article/Supplementary Material. Further inquiries can be directed to the corresponding authors.

Author contributions

LZh and QY contributed to the conception and design of the study. DL, LW, JL, SL, and YL conducted the systematic review including screening of abstracts and full-text and extracting the data. DL, LW, CZ, and LZe conducted the semi-structured interview including data collection and data analysis. DL, LW, and LZe performed the analyses and wrote the manuscript. All authors revised it critically for important intellectual content and gave their approval of the final version.

Funding

This work was supported by the Science and Technology Plan Project of Sichuan Province(2020YFS0035).

Acknowledgments

We are grateful to the evidence-based pharmacy committee of the Chinese Pharmaceutical Association.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fphar.2022.915698/full#supplementary-material

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Summary

Keywords

core outcome sets, outcome reporting, pregnancy, prelabor rupture of membranes, systematic review, semi-structured interview

Citation

Liu D, Wu L, Luo J, Li S, Liu Y, Zhang C, Zeng L, Yu Q and Zhang L (2022) Developing a Core Outcome Set for the Evaluation of Antibiotic Use in Prelabor Rupture of Membranes: A Systematic Review and Semi-Structured Interview. Front. Pharmacol. 13:915698. doi: 10.3389/fphar.2022.915698

Received

08 April 2022

Accepted

02 June 2022

Published

01 August 2022

Volume

13 - 2022

Edited by

Nanbert Zhong, Institute for Basic Research in Developmental Disabilities (IBR), United States

Reviewed by

Ivana Musilova, Charles University, Czechia

Marian Kacerovsky, University Hospital Hradec Kralove, Czechia

Updates

Copyright

*Correspondence: Lingli Zhang,

†This author have contributed equally to this work and share last authorship

This article was submitted to Obstetric and Pediatric Pharmacology, a section of the journal Frontiers in Pharmacology

Disclaimer

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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