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Teschke R, Danan G. Human Leucocyte Antigen Genetics in Idiosyncratic Drug-Induced Liver Injury with Evidence Based on the Roussel Uclaf Causality Assessment Method. MEDICINES (BASEL, SWITZERLAND) 2024; 11:9. [PMID: 38667507 PMCID: PMC11052120 DOI: 10.3390/medicines11040009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 03/06/2024] [Accepted: 04/01/2024] [Indexed: 04/28/2024]
Abstract
The human leucocyte antigen (HLA) allele variability was studied in cohorts of patients with idiosyncratic drug-induced liver injury (iDILI). Some reports showed an association between HLA genetics and iDILI, proposing HLA alleles as a potential risk factor for the liver injury. However, the strength of such assumptions heavily depends on the quality of the iDILI diagnosis, calling for a thorough analysis. Using the PubMed database and Google Science, a total of 25 reports of case series or single cases were retrieved using the terms HLA genes and iDILI. It turned out that in 10/25 reports (40%), HLA genetics were determined in iDILI cases, for which no causality assessment method (CAM) was used or a non-validated tool was applied, meaning the findings were based on subjective opinion, providing disputable results and hence not scoring individual key elements. By contrast, in most iDILI reports (60%), the Roussel Uclaf Causality Assessment Method (RUCAM) was applied, which is the diagnostic algorithm preferred worldwide to assess causality in iDILI cases and represents a quantitative, objective tool that has been well validated by both internal and external DILI experts. The RUCAM provided evidence-based results concerning liver injury by 1 drug class (antituberculotics + antiretrovirals) and 19 different drugs, comprising 900 iDILI cases. Among the top-ranking drugs were amoxicillin-clavulanate (290 cases, HLA A*02:01 or HLA A*30:02), followed by flucloxacillin (255 cases, HLA B*57:01), trimethoprim-sulfamethoxazole (86 cases, HLA B*14:01 or HLA B*14:02), methimazole (40 cases, HLA C*03:02), carbamazepine (29 cases, HLA A*31:01), and nitrofurantoin (26 cases, HLA A*33:01). In conclusion, the HLA genetics in 900 idiosyncratic drug-induced liver injury cases with evidence based on the RUCAM are available for studying the mechanistic steps leading to the injury, including metabolic factors through cytochrome P450 isoforms and processes that activate the innate immune system to the adaptive immune system.
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Affiliation(s)
- Rolf Teschke
- Department of Internal Medicine II, Division of Gastroenterology and Hepatology, Klinikum Hanau, D-63450 Hanau, Germany
- Academic Teaching Hospital of the Medical Faculty, Goethe University Frankfurt/Main, D-60590 Frankfurt am Main, Germany
| | - Gaby Danan
- Pharmacovigilance Consultancy, Rue Des Ormeaux, 75020 Paris, France;
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Tamiru AT, Rade BK, Ali O. The Recurrent Liver Disorder of a Pregnant Mother: Intrahepatic Cholestasis of Pregnancy - A Case Report and Literature Review. Int Med Case Rep J 2021; 14:73-76. [PMID: 33603498 PMCID: PMC7882788 DOI: 10.2147/imcrj.s299354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Accepted: 01/28/2021] [Indexed: 11/23/2022] Open
Abstract
Background Intrahepatic cholestasis of pregnancy (ICP) is a form of liver disease which is unique to pregnancy with a worldwide prevalence ranging from 0.3% and 5.6% of pregnancies. It is presented with skin pruritus and elevated total serum bile salt and liver function test with unknown etiologic agent but suggested hormonal, environmental and genetic risk factors. Case Presentation A 31-year-old Gravida III and Para II mother came to University of Gondar specialized hospital at the outpatient clinic in January 2019 with complain of generalized pruritus along with jaundice at 24 weeks gestational age (GA). She presented with singleton and intrauterine pregnancy with a history of one neonatal loss, one living child, and elevated bilirubin, on admission blood serum test showed elevated serum transaminases, and bilirubin. At 30 weeks GA her bilirubin total and bilirubin direct tests were 4.52 mg/dl and 3.45 mg/dl respectively. At 34 weeks GA her bilirubin values became elevated. At 37 weeks GA fetal delivery was carried out via successful caesarean section with an indication of non-reassuring fetal heart rate pattern after induction with oxytocin. The outcome was stable for both mother and baby. After a two week follow up in the outpatient set up, her liver biochemistry test was normal, and free of the clinical features with normal physical growth and intact primitive reflexes of a newborn. Conclusion Presenting with a typical marker of increased liver function tests, bilirubin values and pruritus as a clinical feature, ICP was diagnosed. After an attempt at an oxytocin induction, an effective cesarean section was performed to deliver a live female baby, weighing 2.8 kg. The case disappeared after three weeks follow up in the puerperium.
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Affiliation(s)
- Animut Tagele Tamiru
- Department of General Midwifery, School of Midwifery, College of Medicine and Health Sciences Comprehensive Specialized Hospital, University of Gondar, Gondar, Ethiopia
| | - Bayew Kelkay Rade
- Department of General Midwifery, School of Midwifery, College of Medicine and Health Sciences Comprehensive Specialized Hospital, University of Gondar, Gondar, Ethiopia
| | - Oumer Ali
- Department of Obstetrics and Gynecology, College of Medicine and Health Sciences Comprehensive Specialized Hospital, University of Gondar, Gondar, Ethiopia
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González‐Muñoz M, Monserrat Villatoro J, Marín‐Serrano E, Stewart S, Bardón Rivera B, Marín J, Martínez de Soto L, Seco Meseguer E, Ramírez E. A case report of a drug-induced liver injury (DILI) caused by multiple antidepressants with causality established by the updated Roussel Uclaf causality assessment method (RUCAM) and in vitro testing. Clin Case Rep 2020; 8:3105-3109. [PMID: 33363890 PMCID: PMC7752543 DOI: 10.1002/ccr3.3348] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 06/17/2020] [Accepted: 08/22/2020] [Indexed: 12/13/2022] Open
Abstract
A 56-year-old female patient was hospitalized because of a lack of response and poor tolerance to multiple antidepressants, which included an episode of DILI. During hospitalization, the patient suffered another episode of DILI. Causality was assessed both by RUCAM and Lymphocyte Transformation Test, allowing to identify a safer medication.
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Affiliation(s)
- Miguel González‐Muñoz
- Immunology DepartmentLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazMadridEspaña
| | - Jaime Monserrat Villatoro
- Clinical Pharmacology DepartmentFacultad de MedicinaLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazUniversidad Autónoma de MadridMadridEspaña
| | - Eva Marín‐Serrano
- Gastroenterology and Hepatology DepartmentLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazMadridEspaña
| | - Stefan Stewart
- Clinical Pharmacology DepartmentFacultad de MedicinaLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazUniversidad Autónoma de MadridMadridEspaña
| | - Belén Bardón Rivera
- Psiquiatry DepartmentLa Paz‐Cantoblanco‐Carlos III University Hospital, IdiPazMadridEspaña
| | - Jesús Marín
- Psiquiatry DepartmentLa Paz‐Cantoblanco‐Carlos III University Hospital, IdiPazMadridEspaña
| | - Lucía Martínez de Soto
- Clinical Pharmacology DepartmentFacultad de MedicinaLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazUniversidad Autónoma de MadridMadridEspaña
| | - Enrique Seco Meseguer
- Clinical Pharmacology DepartmentFacultad de MedicinaLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazUniversidad Autónoma de MadridMadridEspaña
| | - Elena Ramírez
- Clinical Pharmacology DepartmentFacultad de MedicinaLa Paz‐Cantoblanco‐Carlos III University HospitalIdiPazUniversidad Autónoma de MadridMadridEspaña
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Teschke R, Danan G. Worldwide Use of RUCAM for Causality Assessment in 81,856 Idiosyncratic DILI and 14,029 HILI Cases Published 1993-Mid 2020: A Comprehensive Analysis. MEDICINES (BASEL, SWITZERLAND) 2020; 7:E62. [PMID: 33003400 PMCID: PMC7600114 DOI: 10.3390/medicines7100062] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 09/23/2020] [Accepted: 09/25/2020] [Indexed: 04/12/2023]
Abstract
Background: A large number of idiosyncratic drug induced liver injury (iDILI) and herb induced liver injury(HILI) cases of variable quality has been published but some are a matter of concern if the cases were not evaluated for causality using a robust causality assessment method (CAM) such as RUCAM (Roussel Uclaf Causality Assessment Method) as diagnostiinjuryc algorithm. The purpose of this analysis was to evaluate the worldwide use of RUCAM in iDILI and HILI cases. Methods: The PubMed database (1993-30 June 2020) was searched for articles by using the following key terms: Roussel Uclaf Causality Assessment Method; RUCAM; Idiosyncratic drug induced liver injury; iDILI; Herb induced liver injury; HILI. Results: Considering reports published worldwide since 1993, our analysis showed the use of RUCAM for causality assessment in 95,885 cases of liver injury including 81,856 cases of idiosyncratic DILI and 14,029 cases of HILI. Among the top countries providing RUCAM based DILI cases were, in decreasing order, China, the US, Germany, Korea, and Italy, with China, Korea, Germany, India, and the US as the top countries for HILI. Conclusion: Since 1993 RUCAM is certainly the most widely used method to assess causality in IDILI and HILI. This should encourage practitioner, experts, and regulatory agencies to use it in order to reinforce their diagnosis and to take sound decisions.
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Affiliation(s)
- Rolf Teschke
- Department of Internal Medicine II, Division of Gastroenterology and Hepatology, Klinikum Hanau, D-63450 Hanau, Teaching Hospital of the Medical Faculty of the Goethe University, D-60590 Frankfurt/Main, Germany
| | - Gaby Danan
- Pharmacovigilance Consultancy, F-75020 Paris, France;
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Real M, Barnhill MS, Higley C, Rosenberg J, Lewis JH. Drug-Induced Liver Injury: Highlights of the Recent Literature. Drug Saf 2020; 42:365-387. [PMID: 30343418 DOI: 10.1007/s40264-018-0743-2] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Drug-induced liver injury (DILI), herbal-induced liver injury, and herbal and dietary supplement (HDS)-induced liver injury are an important aspect of drug safety. Knowledge regarding responsible drugs, mechanisms, risk factors, and the diagnostic tools to detect liver injury have continued to grow in the past year. This review highlights what we considered the most significant publications from among more than 1800 articles relating to liver injury from medications, herbal products, and dietary supplements in 2017 and 2018. The US Drug-Induced Liver Injury Network (DILIN) prospective study highlighted several areas of ongoing study, including the potential utility of human leukocyte antigens and microRNAs as DILI risk factors and new data on racial differences, the role of alcohol consumption, factors associated with prognosis, and updates on the clinical signatures of autoimmune DILI, thiopurines, and HDS agents. Novel data were also generated from the Spanish and Latin American DILI registries as well as from Chinese and Korean case series. A few new agents causing DILI were added to the growing list in the past 2 years, including sodium-glucose co-transporter-2 inhibitors, as were new aspects of chemotherapy-associated liver injury. A number of cases reported previously described hepatotoxins confirmed via the Roussel Uclaf Causality Assessment Method (RUCAM; e.g., norethisterone, methylprednisolone, glatiramer acetate) and/or the DILIN method (e.g., celecoxib, dimethyl fumarate). Additionally, much work centered on elucidating the pathophysiology of DILI, including the importance of bile salt export pumps and immune-mediated mechanisms. Finally, it must be noted that, while hundreds of new studies described DILI in 2017-2018, the quality of such reports must always be addressed. Björnsson reminds us to remain very critical of the data when addressing the future utility of a study, which is why it is so important to adhere to a standardized method such as RUCAM when determining DILI causality. While drug-induced hepatotoxicity remains a diagnosis of exclusion, the diverse array of publications that appeared in 2017 and 2018 provided important advances in our understanding of DILI, paving the way for our improved ability to make a more definitive diagnosis and risk assessment.
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Affiliation(s)
- Mark Real
- Division of Gastroenterology and Hepatology, Georgetown University Hospital, Washington, DC, USA
| | - Michele S Barnhill
- Department of Medicine, Georgetown University Hospital, Washington, DC, USA
| | - Cory Higley
- Department of Medicine, Georgetown University Hospital, Washington, DC, USA
| | - Jessica Rosenberg
- Department of Medicine, Georgetown University Hospital, Washington, DC, USA
| | - James H Lewis
- Division of Gastroenterology and Hepatology, Georgetown University Hospital, Washington, DC, USA.
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Teschke R. Idiosyncratic DILI: Analysis of 46,266 Cases Assessed for Causality by RUCAM and Published From 2014 to Early 2019. Front Pharmacol 2019; 10:730. [PMID: 31396080 PMCID: PMC6664244 DOI: 10.3389/fphar.2019.00730] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 06/05/2019] [Indexed: 12/12/2022] Open
Abstract
One of the most difficult challenges in clinical hepatology is the diagnosis of a drug-induced liver injury (DILI). The timing of the events, exclusion of alternative causes, and taking into account the clinical context should be systematically assessed and scored in a transparent manner. RUCAM (Roussel Uclaf Causality Assessment Method) is a well-established diagnostic algorithm and scale to assess causality in patients with suspected DILI. First published in 1993 and updated in 2016, RUCAM is now the worldwide most commonly used causality assessment method (CAM) for DILI. The following manuscript highlights the recent implementation of RUCAM around the world, by reviewing the literature for publications that utilized RUCAM, and provides a review of “best practices” for the use of RUCAM in cases of suspected DILI. The worldwide appreciation of RUCAM is substantiated by the current analysis of 46,266 DILI cases, all tested for causality using RUCAM. These cases derived from 31 reports published from 2014 to early 2019. Their first authors came from 10 countries, with China on top, followed by the US, and Germany on the third rank. Importantly, all RUCAM-based DILI reports were published in high profile journals. Many other reports were published earlier from 1993 up to 2013 in support of RUCAM. Although most of the studies were of high quality, the current case analysis revealed shortcomings in few studies, not at the level of RUCAM itself but rather associated with the work of the users. To ensure in future DILI cases a better performance by the users, a list of essential elements is proposed. As an example, all suspected DILI cases should be evaluated 1) by the updated RUCAM to facilitate result comparisons, 2) according to a prospective study protocol to ensure complete data sets, 3) after exclusion of cases with herb induced liver injury (HILI) from a DILI cohort to prevent confounding variables, and 4) according to inclusion of DILI cases with RUCAM-based causality gradings of highly probable or probable, in order to increase the specificity of the results. In conclusion, RUCAM benefits from its high appreciation and performs well provided the users adhere to published recommendations to prevent confounding variability.
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Affiliation(s)
- Rolf Teschke
- Department of Internal Medicine II, Division of Gastroenterology and Hepatology, Klinikum Hanau, Academic Teaching Hospital of the Medical Faculty, Goethe University Frankfurt, Germany
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7
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El-Hawary SS, Ali ZY, Younis IY. Hepatoprotective potential of standardized Ficus species in intrahepatic cholestasis rat model: Involvement of nuclear factor-κB, and Farnesoid X receptor signaling pathways. JOURNAL OF ETHNOPHARMACOLOGY 2019; 231:262-274. [PMID: 30458280 DOI: 10.1016/j.jep.2018.11.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 11/14/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Ficus is an important commercial crop not only for its nutritive value but also, for its medicinal value. Several Ficus species have been traditionally used in the Egypt, Indian and Chinese as carminative, astringent, antibacterial, hepatoprotective, and hypolipidemic agents. AIM OF THE STUDY To standardize and compare the possible hepatoprotective potential of the ethanolic extract of leaves of five tested Ficus species namely: Ficus mysorensis Roth ex Roem. & Schult, Ficus pyriformis Hook. & Arn., Ficus auriculata Lour., Ficus trigonata L., and Ficus spragueana Mildbr. & Burret in the intrahepatic cholestasis rat model induced by 17α-Ethinylestradiol (EE) and to explore the mechanism of action with respect to their phytochemical constituents. MATERIALS AND METHODS Determination of the total phenolic and flavonoid contents, chromatographic examination and acute oral toxicity test were performed on the tested Ficus extracts. Animals were divided into 8 groups. Group 1, served as control for 2 weeks. Group 2, untreated cholestatic rats. Groups 3-8, pretreated with Ficus extracts (100 mg/Kg/day, p.o) or ursodeoxycholic acid (as reference drug) for 2 weeks and injected by EE in the last 5 days. Serum liver function test, 5'-nucleotidase (5'-N), total bile acids (TBA), total cholesterol (T.C) and phospholipids were assayed. Also, hepatic Na+/K+-ATPase, nuclear factor-κB (NF-κB), tumor necrosis factor-α (TNF-α), hepatocyte growth factor (HGF), hemeoxygenase-1 (HO-1), and markers of oxidative stress were investigated. Furthermore, molecular docking study was performed to explore the ability of the major constituents of Ficus to interact with Farnesoid X receptor (FXR). RESULTS Four phenolic compounds (gallic, chlorogenic acid, caffeic acids and rutin) were identified. Chlorogenic acid and rutin represented the major constituents of Ficus extracts. Simultaneous administration of Ficus extracts with EE effectively: i- preserved liver function, TBA, T.C and phospholipids, ii- suppressed the pro-inflammatory cytokines (NF-κB and TNF-α), iii- enhanced hepatic regeneration (HGF) and antioxidant defense system. Furthermore, molecular docking reveals that rutin and chlorogenic acid effectively act as FXR agonists. CONCLUSION Among the tested extracts, Ficus spragueana Mildbr. & Burret enriched with phenolics exhibited a pronounced hepatoprotective activity and may provide a new therapeutic approach for estrogen-induced cholestasis.
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Affiliation(s)
- Seham S El-Hawary
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
| | - Zeinab Y Ali
- Department of Biochemistry, National Organization for Drug Control and Research (NODCAR), 12553 Giza, Egypt
| | - Inas Y Younis
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
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Teschke R. Idiosyncratic DILI: Analysis of 46,266 Cases Assessed for Causality by RUCAM and Published From 2014 to Early 2019. Front Pharmacol 2019. [PMID: 31396080 DOI: 10.389/fphar.2019.00730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023] Open
Abstract
One of the most difficult challenges in clinical hepatology is the diagnosis of a drug-induced liver injury (DILI). The timing of the events, exclusion of alternative causes, and taking into account the clinical context should be systematically assessed and scored in a transparent manner. RUCAM (Roussel Uclaf Causality Assessment Method) is a well-established diagnostic algorithm and scale to assess causality in patients with suspected DILI. First published in 1993 and updated in 2016, RUCAM is now the worldwide most commonly used causality assessment method (CAM) for DILI. The following manuscript highlights the recent implementation of RUCAM around the world, by reviewing the literature for publications that utilized RUCAM, and provides a review of "best practices" for the use of RUCAM in cases of suspected DILI. The worldwide appreciation of RUCAM is substantiated by the current analysis of 46,266 DILI cases, all tested for causality using RUCAM. These cases derived from 31 reports published from 2014 to early 2019. Their first authors came from 10 countries, with China on top, followed by the US, and Germany on the third rank. Importantly, all RUCAM-based DILI reports were published in high profile journals. Many other reports were published earlier from 1993 up to 2013 in support of RUCAM. Although most of the studies were of high quality, the current case analysis revealed shortcomings in few studies, not at the level of RUCAM itself but rather associated with the work of the users. To ensure in future DILI cases a better performance by the users, a list of essential elements is proposed. As an example, all suspected DILI cases should be evaluated 1) by the updated RUCAM to facilitate result comparisons, 2) according to a prospective study protocol to ensure complete data sets, 3) after exclusion of cases with herb induced liver injury (HILI) from a DILI cohort to prevent confounding variables, and 4) according to inclusion of DILI cases with RUCAM-based causality gradings of highly probable or probable, in order to increase the specificity of the results. In conclusion, RUCAM benefits from its high appreciation and performs well provided the users adhere to published recommendations to prevent confounding variability.
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Affiliation(s)
- Rolf Teschke
- Department of Internal Medicine II, Division of Gastroenterology and Hepatology, Klinikum Hanau, Academic Teaching Hospital of the Medical Faculty, Goethe University Frankfurt, Germany
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Mei Y, Lin Y, Luo D, Gao L, He L. Perinatal outcomes in intrahepatic cholestasis of pregnancy with monochorionic diamniotic twin pregnancy. BMC Pregnancy Childbirth 2018; 18:291. [PMID: 29980184 PMCID: PMC6035470 DOI: 10.1186/s12884-018-1913-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 06/22/2018] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND The primary aim of the study is to investigate the perinatal outcomes in intrahepatic cholestasis of pregnancy (ICP) with monochorionic diamniotic (MCDA) twin pregnancy. METHODS This study is a retrospective observational study for women with ICP and MCDA twin pregnancy. Included cases were divided into mild ICP group (10-39 mmol/L) and severe ICP group (> = 40 mmol/L), whose perinatal outcomes were compared between this two groups and whose predictors of adverse perinatal outcomes were evaluated. RESULTS 37 cases and 21 cases are in mild and severe ICP group respectively, of which, the incidence of gestational diabetes mellitus (GDM) and iatrogenic preterm delivery in severe ICP group are higher than those in mild ICP group. Gestational age (GA) at diagnosis of ICP < 32 weeks is an independent risk factor for GA at delivery < 35 weeks and for composite adverse neonatal outcome. Total bile acids (TBA) > 40 mmol/l is an independent risk factor for meconium-stained amniotic fluid. CONCLUSION For women with ICP and MCDA twin pregnancy, GA at diagnosis of ICP < 32 weeks and TBA > 40umol/L are associated with adverse perinatal outcomes.
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MESH Headings
- Adult
- China/epidemiology
- Cholestasis, Intrahepatic/diagnosis
- Cholestasis, Intrahepatic/epidemiology
- Female
- Gestational Age
- Humans
- Infant, Newborn
- Infant, Newborn, Diseases/diagnosis
- Infant, Newborn, Diseases/epidemiology
- Parturition
- Pregnancy
- Pregnancy Complications/diagnosis
- Pregnancy Complications/epidemiology
- Pregnancy Outcome/epidemiology
- Pregnancy, Twin/physiology
- Pregnancy, Twin/statistics & numerical data
- Premature Birth/diagnosis
- Premature Birth/epidemiology
- Premature Birth/prevention & control
- Prognosis
- Retrospective Studies
- Risk Factors
- Severity of Illness Index
- Twins, Monozygotic
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Affiliation(s)
- Youwen Mei
- Department of Obstetrics and Gynecology, Chengdu Women and Children’s Central Hospital, Chengdu City, Sichuan Province China
| | - Yonghong Lin
- Department of Obstetrics and Gynecology, Chengdu Women and Children’s Central Hospital, Chengdu City, Sichuan Province China
| | - Dan Luo
- Department of Obstetrics and Gynecology, Chengdu Women and Children’s Central Hospital, Chengdu City, Sichuan Province China
| | - Lan Gao
- Department of Obstetrics and Gynecology, Chengdu Women and Children’s Central Hospital, Chengdu City, Sichuan Province China
| | - Li He
- Department of Obstetrics and Gynecology, Chengdu Women and Children’s Central Hospital, Chengdu City, Sichuan Province China
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