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Qin Y, Jia Y, Liang C, Fu R, Liang Z, Wang Y, Feng M, Gao C, Luo J. Clinical Performance of Immunonephelometric Assay and Chemiluminescent Immunoassay for Detection of IgG Subclasses in Chinese. J Clin Lab Anal 2024; 38:e25033. [PMID: 38563457 PMCID: PMC11073813 DOI: 10.1002/jcla.25033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 02/04/2024] [Accepted: 03/09/2024] [Indexed: 04/04/2024] Open
Abstract
BACKGROUND Detection of IgG subclasses (IgGSc) is vital for the diagnosis and management of disease, especially IgG4-related diseases (IgG4-RD). This study aimed to evaluate the performances of the chemiluminescent immunoassay (CLIA) for detecting IgGSc and diagnosing IgG4-RD by IgGSc. METHODS A total of 40 individuals with IgG4-RD, 40 with primary Sjogren's syndrome (pSS), and 40 healthy controls (HCs) were enrolled. Serum samples were collected for the simultaneous detection of IgG1, IgG2, IgG3, and IgG4 by the Siemens immunonephelometric assay and the CLIA. The correlation analysis was performed, and diagnostic value was analyzed by the receiver operating characteristic (ROC) curve. RESULTS Patients with IgG4-RD had higher IgG4 (p < 0.001) and lower IgG1 (p < 0.001) than those with pSS, and HC. The results by the Siemens immunonephelometric assay and the CLIA showed a strong correlation in detecting IgG1, IgG2, IgG3, and IgG4 (r = 0.937, r = 0.847, r = 0.871, r = 0.990, all p < 0.001, respectively). The sum of IgG1, IgG2, IgG3, and IgG4 using two assays strongly correlated with total IgG by the IMMAGE 800 (r = 0.866, r = 0.811, both p < 0.001, respectively). For discriminating IgG4-RD from pSS and HC, no significant differences were observed in CLIA IgG4 and Siemens immunonephelometric assay IgG4 (z = 0.138, p = 0.891), which provided the area under the curves (AUCs) of 0.951 (p < 0.001) and 0.950 (p < 0.001), respectively. The AUCs of CLIA IgG1 and Siemens immunonephelometric assay IgG1 in distinguishing pSS from IgG4-RD and HC were 0.761 (p < 0.001) and 0.765 (p < 0.001), respectively, with no significant differences (z = 0.228, p = 0.820). CONCLUSIONS The CLIA and the Siemens immunonephelometric assay appeared to have good consistency with comparable diagnostic value in detecting IgGSc, especially IgG4, and IgG1 that can accurately identify IgG4-RD or pSS in clinical practice.
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Affiliation(s)
- Yan Qin
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
- Shanxi Center for Clinical LaboratoryTaiyuanShanxiChina
| | - Yuhan Jia
- The Shanxi Medical UniversityTaiyuanShanxiChina
| | - Congcong Liang
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
| | - Rui Fu
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
| | - Zhaojun Liang
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
| | - Yanlin Wang
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
| | - Min Feng
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
| | - Chong Gao
- Department of Pathology, Brigham and Women's HospitalHarvard Medical SchoolBostonMassachusettsUSA
| | - Jing Luo
- Department of Rheumatologythe Second Hospital of Shanxi Medical UniversityTaiyuanShanxiChina
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Onwuka DC, Chen LYC, Zhan SH, Seidman MA, Cartagena L, Killow V, Abou-Tak H, Mattman A, Carruthers MN. Mass spectrometry in IgG4-related disease diagnosis. Sci Rep 2024; 14:2584. [PMID: 38297074 PMCID: PMC10831111 DOI: 10.1038/s41598-024-53206-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 01/29/2024] [Indexed: 02/02/2024] Open
Abstract
We compared liquid chromatography tandem mass spectrometry (LC-MS/MS) against Binding Site immunonephelometry (BSIN) with regards to these methods' abilities to diagnose IgG4-related disease (IgG4-RD). IgG subclasses were gathered from laboratory from December 2011 to December 2020. The IgG4-RD positive and negative patients were diagnosed according to the ACR/EULAR classification criteria by extensive chart review. Both methods' results were compared in terms of test characteristics. For BSIN, there were 43 IgG4-RD positive cases and 174 disease negative cases, while for LC-MS/MS, there were 102 IgG4-RD positive cases and 562 disease negative cases. The majority of IgG4-RD patients by BSIN and LC-MS/MS had an elevated IgG4 level, 81% and 86%, respectively. For BSIN, the ROC curve, cut-off value of 1.25 g/L, had a sensitivity of 81% and a specificity of 84%. For LC-MS/MS, the ROC curve, cut-off value of 1.25 g/L, had a sensitivity of 86% and a specificity of 84%. The responder index score to IgG4 level r-correlation value for BSIN and LC-MS/MS was 0.5 and 0.6, respectively. In our center, LC-MS/MS and BSIN are equivalent test methods in IgG4-RD diagnosis. IgG4 level does correlate with disease activity by the responder index. LC-MS/MS is a valid and equally reliable alternative to BSIN in the diagnosis of IgG4-related disease.
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Affiliation(s)
- Daniel C Onwuka
- Arthritis Research Canada, 2238 Yukon Street #230, Vancouver, BC, V5Y 3P2, Canada
| | - Luke Y C Chen
- University of British Columbia, Vancouver, BC, Canada
| | - Shing H Zhan
- University of British Columbia, Vancouver, BC, Canada
| | | | - Liliana Cartagena
- Arthritis Research Canada, 2238 Yukon Street #230, Vancouver, BC, V5Y 3P2, Canada
| | | | | | - Andre Mattman
- University of British Columbia, Vancouver, BC, Canada
| | - Mollie N Carruthers
- Arthritis Research Canada, 2238 Yukon Street #230, Vancouver, BC, V5Y 3P2, Canada.
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Ding H, Zhou L, Zheng L, Wang J, Zhai Y, Zhou X, Zhao P. Clinical patterns and risk factors for multiorgan involvement in IgG4-Related disease patients. Heliyon 2024; 10:e23433. [PMID: 38170118 PMCID: PMC10758819 DOI: 10.1016/j.heliyon.2023.e23433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 11/29/2023] [Accepted: 12/04/2023] [Indexed: 01/05/2024] Open
Abstract
Background IgG4-related disease with multiorgan involvement predicts higher disease activity, thus, it is necessary to identify whether IgG4-related disease involves multiple organs at the early stage. To further clarify the clinical characteristics and risk factors for IgG4-related disease with multiorgan involvement, we conducted an observational study. Methods We retrospectively analysed the clinical data of 160 patients who were primarily diagnosed with IgG4-related disease at the First Affiliated Hospital of Zhengzhou University from January 2015 to January 2021. According to the number of involved organs, patients were divided into two groups: multiorgan involvement and nonmultiorgan involvement. Patients were divided into a multiorgan group and a nonmultiorgan group according to multiple organ involvement. Results There were 82 cases identified with multiorgan involvement and 78 cases diagnosed with no multiorgan involvement in this series. Most cases were elderly and male (p > 0.05). The most frequently affected organs in IgG4-RD were the lymph nodes (50.6 %), pancreas (38.7 %) and salivary glands (35.6 %). Multivariate analysis showed that eosinophilia, IgG4>2*ULN, lymph node involvement, salivary gland involvement and lung involvement were independent risk factors for multiorgan involvement (p < 0.05). Conclusions The main issues in clinical practice are how to accurately diagnose the disease and screen the more vulnerable organs.
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Affiliation(s)
- Hang Ding
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
- Department of Gastroenterology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang 441021, China
| | - Lin Zhou
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
- Department of Gastroenterology, Shanghai Pudong Gongli Hospital, Shanghai, 200135, China
| | - Linlin Zheng
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Jiahui Wang
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Yongpeng Zhai
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xinyi Zhou
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Ping Zhao
- Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
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Imai S, Tahara N, Igata S, Tahara A, Bekki M, Sugiyama Y, Maeda-Ogata S, Honda A, Otsuka H, Ushijima T, Okabe Y, Kaida H, Abe T, Tanaka H, Fukumoto Y, Tayama E. Vascular/perivascular inflammation in IgG4-related disease. J Nucl Cardiol 2022; 29:2920-2933. [PMID: 34704218 DOI: 10.1007/s12350-021-02812-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 09/12/2021] [Indexed: 01/29/2023]
Abstract
BACKGROUND Immunoglobulin G4-related disease (IgG4-RD) is characterized by the infiltration of IgG4-positive plasma cells and fibrosclerotic inflammation in multiple organs. Although vascular complications are present in some patients with IgG4-RD, vascular and/or perivascular inflammatory activity compared to control subjects remains unknown. This study sought to investigate vascular/perivascular inflammation in IgG4-RD patients compared to control subjects using 18F-fluorodeoxyglucose-positron emission tomography combined with computed tomography (FDG-PET/CT). METHODS We examined 37 consecutive patients diagnosed as IgG4-RD (29 males, mean age of 64.3 ± 8.3 years old), who underwent FDG-PET/CT. Thirty-seven age- and gender-matched subjects without IgG4-RD were employed as controls. Vascular/perivascular inflammation was quantified by blood-normalized standardized uptake value, known as a target-to-background ratio (TBR). RESULTS All IgG4-RD patients presented with multiple region involvements. Twelve (32.4%) of the IgG4-RD patients had vascular complications, all of which appeared in the abdominal aorta. IgG4-RD patients had significantly higher TBR values in the descending aorta, abdominal aorta, and common iliac artery than control subjects. Also, IgG4-RD patients with vascular complication exhibited higher TBR values in the infra-renal aorta and common iliac artery than those without vascular complication. CONCLUSIONS We found that vascular FDG activity is significantly elevated in IgG4-RD patients regardless of vascular complication than control subjects. FDG-PET/CT is a useful modality for assessing vascular/perivascular inflammation, which may contribute vascular complication in IgG4-RD patients.
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Affiliation(s)
- Shinichi Imai
- Department of Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Nobuhiro Tahara
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan.
| | - Sachiyo Igata
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Atsuko Tahara
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Munehisa Bekki
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Yoichi Sugiyama
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Shoko Maeda-Ogata
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Akihiro Honda
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Hiroyuki Otsuka
- Department of Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Tomoyuki Ushijima
- Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan
| | - Yoshinobu Okabe
- Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan
| | - Hayato Kaida
- Department of Radiology, Kindai University Faculty of Medicine, Osakasayama, Japan
| | - Toshi Abe
- Department of Radiology, Kurume University School of Medicine, Kurume, Japan
| | - Hiroyuki Tanaka
- Department of Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Yoshihiro Fukumoto
- Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan
| | - Eiki Tayama
- Department of Surgery, Kurume University School of Medicine, Kurume, Japan
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Zhao EJ, Gauiran DTV, Slack GW, Dutz JP, Chen LYC. A 54-Year-Old Woman with Cutaneous Nodules. NEJM EVIDENCE 2022; 1:EVIDmr2200035. [PMID: 38319205 DOI: 10.1056/evidmr2200035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
A 54-Year-Old Woman with Cutaneous NodulesA 54-year-old woman presented with chronic cutaneous nodules and plaques. How do you approach the evaluation, and what is the diagnosis?
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Affiliation(s)
- Eric J Zhao
- The University of British Columbia Hematology Fellowship Program
| | | | - Graham W Slack
- The University of British Columbia Hematology Fellowship Program
| | - Jan P Dutz
- The University of British Columbia Hematology Fellowship Program
| | - Luke Y C Chen
- The University of British Columbia Hematology Fellowship Program
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6
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IgG4-related pseudotumours: a series of 12 cases and a review of the literature. Pathology 2022; 54:563-572. [DOI: 10.1016/j.pathol.2021.11.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 11/11/2021] [Accepted: 11/18/2021] [Indexed: 11/22/2022]
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van der Gugten JG, Holmes DT, Mattman A. Quantitation of IgG Subclasses in Serum Using Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS). Methods Mol Biol 2022; 2546:205-216. [PMID: 36127591 DOI: 10.1007/978-1-0716-2565-1_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Serum IgG subclasses (IgGSC) are measured for a number of indications, but the most common are the identification of selective immunodeficiency disease and the diagnosis of IgG4-related disease (IgG4RD). Traditional nephelometric (IN) assays can suffer from two issues impacting the accuracy of the results: (1) hook effect and (2) antibody cross-reactivity between the subclasses. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is not vulnerable to these modes of interference and therefore serves as an excellent and relatively inexpensive means of diagnosing and/or monitoring the relevant clinical conditions.We describe a semiautomated and simple method for the accurate and precise measurement of IgGSC from 20 μL of serum using a liquid chromatography and tandem mass spectrometry (LC-MS/MS) method following digestion of serum proteins in 96-well plate format. Due to the high abundance of the target proteins, no specialized sample preparation (such as solid phase extraction) is required. Twenty microliters are injected to the LC-MS/MS system. Quantitation is performed against a five-point duplicate linear calibration curve prepared in blank matrix. The assay calibration range is 0.38-7.74 g/L for IgG1, 0.24-4.46 g/L for IgG2, 0.038-0.752 g/L for IgG3, 0.025-0.435 g/L for IgG4, and 0.62-15.5 g/L for total IgG. Total IgG is used as an internal quality control marker and is compared to the sum of the four subclass results. Total imprecision in clinical production has been observed to be 5.1-10.6% for in-house prepared control materials having IgGSC mean values in the range of 0.38-8.43 g/L for IgG1, 0.22-3.76 g/L for IgG2, 0.0387-0.721 g/L for Ig3, and 0.0279-1.46 g/L for IgG4. Limit of quantitation (LoQ) was determined to be 0.29 g/L for IgG1, 0.22 g/L for IgG2, 0.019 g/L for IgG3, and 0.0067 g/L for IgG4.
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Affiliation(s)
- J Grace van der Gugten
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
- Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, BC, Canada
| | - Daniel T Holmes
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
- Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, BC, Canada
| | - Andre Mattman
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada.
- Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, BC, Canada.
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Cao L, Rigi M, Lima J. Abnormal Serum Protein Electrophoresis in a Patient with Abdominal Pain. Clin Chem 2021; 67:1738-1739. [DOI: 10.1093/clinchem/hvab125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 06/11/2021] [Indexed: 11/14/2022]
Affiliation(s)
- Liyun Cao
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Mohammed Rigi
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jose Lima
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
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9
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McGreal-Bellone A, Lapthorne S, Sadlier C, Moloney G. Suspected IgG4-related disease of the submandibular salivary gland and periorbital soft tissue in a man with latent tuberculosis. BMJ Case Rep 2021; 14:e242415. [PMID: 34429286 PMCID: PMC8386220 DOI: 10.1136/bcr-2021-242415] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/06/2021] [Indexed: 11/03/2022] Open
Abstract
A 77-year-old Lithuanian man presented to our institution with recurrent episodes of periorbital cellulitis, submandibular swelling and sialadenitis. Investigations revealed a positive QuantiFERON, raised inflammatory markers and normal autoimmune screen. Cross-sectional imaging showed no signs of occult malignancy, and work-up for mycobacterial infection including imaging and bronchoalveolar lavage did not show active tuberculosis. During hospitalisation, the patient developed fevers of unknown origin, which were investigated with a positron emission tomography (PET) scan and a bone marrow aspiration, without evidence of occult infection or malignancy. Serum IgG4 level was three times the upper limit of normal. The patient responded well to oral steroids but relapsed after completing a slow taper. Serum IgG4 level was three times the upper limit of normal. He had an American College of Rheumatology/European League Against Rheumatism score of 20, in conjunction with involvement of orbital and salivary tissue. Therefore, IgG4-related disease was considered the most likely diagnosis, despite prominent fevers, which are among the exclusion criteria for this diagnosis. After a multidisciplinary review including rheumatology and ophthalmology, the patient was commenced on maintenance methotrexate with remission of symptoms.
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Affiliation(s)
| | - Susan Lapthorne
- Department of Infectious Diseases, Cork University Hospital Group, Cork, Ireland
| | - Corinna Sadlier
- Department of Infectious Diseases, Cork University Hospital Group, Cork, Ireland
| | - Geraldine Moloney
- Department of Infectious Diseases, Cork University Hospital Group, Cork, Ireland
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Pötter-Lang S, Ba-Ssalamah A, Bastati N, Messner A, Kristic A, Ambros R, Herold A, Hodge JC, Trauner M. Modern imaging of cholangitis. Br J Radiol 2021; 94:20210417. [PMID: 34233488 PMCID: PMC9327751 DOI: 10.1259/bjr.20210417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Cholangitis refers to inflammation of the bile ducts with or without accompanying infection. When intermittent or persistent inflammation lasts 6 months or more, the condition is classified as chronic cholangitis. Otherwise, it is considered an acute cholangitis. Cholangitis can also be classified according to the inciting agent, e.g. complete mechanical obstruction, which is the leading cause of acute cholangitis, longstanding partial mechanical blockage, or immune-mediated bile duct damage that results in chronic cholangitis.The work-up for cholangitis is based upon medical history, clinical presentation, and initial laboratory tests. Whereas ultrasound is the first-line imaging modality used to identify bile duct dilatation in patients with colicky abdominal pain, cross-sectional imaging is preferable when symptoms cannot be primarily localised to the hepatobiliary system. CT is very useful in oncologic, trauma, or postoperative patients. Otherwise, magnetic resonance cholangiopancreatography is the method of choice to diagnose acute and chronic biliary disorders, providing an excellent anatomic overview and, if gadoxetic acid is injected, simultaneously delivering morphological and functional information about the hepatobiliary system. If brush cytology, biopsy, assessment of the prepapillary common bile duct, stricture dilatation, or stenting is necessary, then endoscopic ultrasound and/or retrograde cholangiography are performed. Finally, when the pathologic duct is inaccessible from the duodenum or stomach, percutaneous transhepatic cholangiography is an option. The pace of the work-up depends upon the severity of cholestasis on presentation. Whereas sepsis, hypotension, and/or Charcot's triad warrant immediate investigation and management, chronic cholestasis can be electively evaluated.This overview article will cover the common cholangitides, emphasising our clinical experience with the chronic cholestatic liver diseases.
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Affiliation(s)
- Sarah Pötter-Lang
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Ahmed Ba-Ssalamah
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Nina Bastati
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Alina Messner
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Antonia Kristic
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Raphael Ambros
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Alexander Herold
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Jacqueline C Hodge
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Michael Trauner
- Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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Rasmussen KF, Sprogøe U, Nielsen C, Shalom DB, Assing K. Time-related variation in IgG subclass concentrations in a group of healthy Danish adults. IMMUNITY INFLAMMATION AND DISEASE 2021; 9:1009-1015. [PMID: 34080322 PMCID: PMC8342227 DOI: 10.1002/iid3.464] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 04/10/2021] [Accepted: 05/04/2021] [Indexed: 12/20/2022]
Abstract
Introduction Immunoglobulin G subclass measurements are important for the diagnostic work‐up of immunodeficiencies and immunoglobulin G4 (IgG4) related diseases. It is currently unknown whether a single sampling is truly representative for an individual's IgG subclass concentrations. This study aimed to investigate whether IgG and IgG subclass concentrations in healthy individuals are stable over time. Method With a span of median 42 weeks, four samples from each of 54 (34M, 20F) healthy adult volunteers (24–66 years) were analyzed for IgG and IgG1–4 using turbidimetry. Concentrations were compared within and between individuals. Results IgG and IgG subclass concentrations followed either a normal (IgG, IgG1, and IgG3) or log normal (IgG2 and IgG4) distribution. Immunoglobulin 4 demonstrated by far the widest range of concentrations between individuals (670‐fold: 0.004–2.68 g/L). Immunoglobulin G subclass variations within individuals were expressed as pooled standard deviations (PSD). These ranged from 0.056 (IgG4) to 0.955 g/L (IgG) and correlated with mean concentration of IgG or the particular IgG subclass. As a consequence, the relative PSDs (i.e., PSD divided by mean IgG or IgG subclass concentration) fell within a narrow range: 5.82%–10.1%. Based on these numbers, the 95%‐upper one‐sided confidence limits for intraindividual IgG and IgG subclass variation was calculated to range from 9.82% (IgG2) to 16.9% (IgG4). Conclusion The study documents that IgG or IgG subclass concentrations within healthy individuals are very stable over at least 42 weeks. The expected variation for IgG4 concentrations at a 95% confidence level does not exceed ±16.9%.
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Affiliation(s)
| | - Ulrik Sprogøe
- Department of Clinical Immunology, University Hospital, Odense, Denmark
| | - Christian Nielsen
- Department of Clinical Immunology, University Hospital, Odense, Denmark
| | - Dana-Bar Shalom
- Department of Clinical Immunology, University Hospital, Odense, Denmark.,Department of Oncology, University Hospital, Odense, Denmark
| | - Kristian Assing
- Department of Clinical Immunology, University Hospital, Odense, Denmark
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12
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Zhao EJ, Cheng CV, Mattman A, Chen LYC. Polyclonal hypergammaglobulinaemia: assessment, clinical interpretation, and management. LANCET HAEMATOLOGY 2021; 8:e365-e375. [PMID: 33894171 DOI: 10.1016/s2352-3026(21)00056-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/18/2021] [Accepted: 02/19/2021] [Indexed: 12/13/2022]
Abstract
This Review outlines a practical approach to assessing and managing polyclonal hypergammaglobulinaemia in adults. Polyclonal hypergammaglobulinaemia is most commonly caused by liver disease, immune dysregulation, or inflammation, but can also provide an important diagnostic clue of rare diseases such as histiocyte disorders, autoimmune lymphoproliferative syndrome, Castleman disease, and IgG4-related disease. Causes of polyclonal hypergammaglobulinaemia can be divided into eight categories: liver disease, autoimmune disease and vasculitis, infection and inflammation, non-haematological malignancy, haematological disorders, IgG4-related disease, immunodeficiency syndromes, and iatrogenic (from immunoglobulin therapy). Measuring serum concentrations of C-reactive protein and IgG subclasses are helpful in diagnosis. IL-6-mediated inflammation, associated with persistently elevated C-reactive protein concentrations (≥30 mg/L), is an important driver of polyclonal hypergammaglobulinaemia in some cases. Although the presence of markedly elevated serum IgG4 concentrations (>5 g/L) is around 90% specific for diagnosing IgG4-related disease, mildly elevated serum IgG4 concentrations are seen in many conditions. In most cases, managing polyclonal hypergammaglobulinaemia simply involves treating the underlying condition. Rarely, however, polyclonal hypergammaglobulinaemia can lead to hyperviscosity, requiring plasmapheresis.
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Affiliation(s)
- Eric J Zhao
- Division of Hematology, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada
| | - Catherine V Cheng
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada
| | - Andre Mattman
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada; Department of Pathology and Laboratory Medicine, St Paul's Hospital, Vancouver, BC, Canada
| | - Luke Y C Chen
- Division of Hematology, University of British Columbia, Vancouver, BC, Canada; Centre for Health Education Scholarship, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada.
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13
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Gauiran DTV, Marcon KM, DeMarco ML, Fung AWS, van der Gugten G, Mattman A, Carruthers MN, Song KW, Chen LYC. IgG4 plasma cell myeloma without clinical evidence of IgG4-related disease: a report of two cases. ACTA ACUST UNITED AC 2021; 25:335-340. [PMID: 32893754 DOI: 10.1080/16078454.2020.1815130] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Background: Serum IgG4 is typically measured to investigate for Immunoglobulin G4-related Disease (IgG4-RD), a fibroinflammatory condition associated with polyclonal increase in serum IgG4. However, increased IgG4 can also be monoclonal, and little is known about IgG4 myeloma. Methods: We describe two cases of IgG4 myeloma without clinical, radiologic, or laboratory features of IgG4-related disease. Results: An 84 year old man presented with anemia and compression fractures and a 77 year old man presented with anemia, hypercalcemia and renal failure. Both had markedly elevated monoclonal serum IgG4, 34 g/L and 48 g/L in the beta region, and increased IgG positive bone marrow plasma cells, 50% and 80%, respectively. Neither had clinical or radiological manifestations of IgG4-related disease (IgG4-RD) such as salivary or lacrimal gland swelling, autoimmune pancreatitis , or retroperitoneal fibrosis. Both cases responded well to standard myeloma therapy. The IgG4 paraprotein caused spuriously elevated beta-2 microglobulin of 45.2 mg/L in case two due to interference with the assay. Conclusion: These cases illustrate the importance of performing serum protein electrophoresis in tandem with IgG subclasses to distinguish between polyclonal and monoclonal increases in serum IgG4. The lack of typical IgG4-RD features in these two patients suggests that monoclonal elevation in serum IgG4 alone is insufficient to cause the organ damage characteristic of IgG4-RD. Larger studies of IgG myeloma subtypes are warranted to explore whether IgG1, IgG2, IgG3 and IgG4 myeloma differ in natural history and whether the interference with beta-2 microglobulin is specific to IgG4 monoclonal proteins.
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Affiliation(s)
- Deonne Thaddeus V Gauiran
- Division of Hematology, University of the Philippines - Philippine General Hospital, Manila, Philippines.,Division of Hematology, University of British Columbia, Vancouver, Canada
| | - Krista M Marcon
- Department of Pathology and Laboratory Medicine, Vancouver General Hospital, Vancouver, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
| | - Mari L DeMarco
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.,Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, Canada
| | - Angela W S Fung
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.,Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, Canada
| | - Grace van der Gugten
- Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, Canada
| | - Andre Mattman
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.,Department of Pathology and Laboratory Medicine, St. Paul's Hospital, Vancouver, Canada
| | | | - Kevin W Song
- Division of Hematology, University of British Columbia, Vancouver, Canada
| | - Luke Y C Chen
- Division of Hematology, University of British Columbia, Vancouver, Canada
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14
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Moller D, Tan J, Gauiran DTV, Medvedev N, Hudoba M, Carruthers MN, Dehghan N, Berghe J, Bruyère H, Chen LY. Causes of hypereosinophilia in 100 consecutive patients. Eur J Haematol 2020; 105:292-301. [DOI: 10.1111/ejh.13437] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 04/28/2020] [Accepted: 04/29/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Daniel Moller
- Department of Medicine University of British Columbia Vancouver BC Canada
| | - Julia Tan
- Department of Medicine University of British Columbia Vancouver BC Canada
| | | | - Nadia Medvedev
- Division of Hematopathology University of British Columbia Vancouver BC Canada
| | - Monika Hudoba
- Division of Hematopathology University of British Columbia Vancouver BC Canada
| | | | - Natasha Dehghan
- Division of Rheumatology University of British Columbia Vancouver BC Canada
| | - Janette Berghe
- Department of Pathology and Laboratory Medicine University of British Columbia and Cytogenomics LaboratoryVancouver General Hospital Vancouver BC Canada
| | - Helene Bruyère
- Department of Pathology and Laboratory Medicine University of British Columbia and Cytogenomics LaboratoryVancouver General Hospital Vancouver BC Canada
| | - Luke Y.C. Chen
- Division of Hematology University of British Columbia Vancouver BC Canada
- Centre for Health Education Scholarship University of British Columbia Vancouver BC Canada
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