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Granqvist K, Ahlstrom L, Karlsson J, Lytsy B, Erichsen A. Central aspects when implementing an electronic monitoring system for assessing hand hygiene in clinical settings: A grounded theory study. J Infect Prev 2024; 25:51-58. [PMID: 38584715 PMCID: PMC10998548 DOI: 10.1177/17571774241230678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 01/21/2024] [Indexed: 04/09/2024] Open
Abstract
Background New technologies, such as electronic monitoring systems, have been developed to promote increased adherence to hand hygiene among healthcare workers. However, challenges when implementing these technologies in clinical settings have been identified. Aim The aim of this study was to explore healthcare workers' experiences when implementing an electronic monitoring system to assess hand hygiene in a clinical setting. Method Interviews with healthcare workers (registered nurses, nurse assistants and leaders) involved in the implementation process of an electronic monitoring system (n = 17) were conducted and data were analyzed according to the grounded theory methodology formulated by Strauss and Corbin. Results Healthcare workers' experiences were expressed in terms of leading and facilitating, participating and contributing, and knowing and confirming. These three aspects were merged together to form the core category of collaborating for progress. Leaders were positive and committed to the implementation of the electronic monitoring system, endeavouring to enable facilitation and support for their co-workers (registered nurses and nurse assistants). At the same time, co-workers were positive about the support they received and contributed by raising questions and demands for the product to be used in clinical settings. Moreover, leaders and co-workers were aware of the objective of implementing the electronic monitoring system. Conclusion We identified dynamic collective work between leaders and co-workers during the implementation of the electronic monitoring system. Leadership, participation and knowledge were central aspects of enhancing a collaborative process. We strongly recommend involving both ward leaders and users of new technologies to promote successful implementation.
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Affiliation(s)
- Karin Granqvist
- Department of Anaesthesia, Surgery and Intensive Care, Sahlgrenska University Hospital, Gothenburg, Sweden
- The Sahlgrenska Academy, Institute of Health and Care Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Linda Ahlstrom
- The Sahlgrenska Academy, Institute of Health and Care Sciences, University of Gothenburg, Gothenburg, Sweden
- Department of Orthopaedics, Sahlgrenska University Hospital, Region Västra Götaland, Gothenburg, Sweden
| | - Jon Karlsson
- Department of Orthopaedics, Sahlgrenska University Hospital, Region Västra Götaland, Gothenburg, Sweden
- Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Birgitta Lytsy
- Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska Institutet, Sweden
| | - Annette Erichsen
- The Sahlgrenska Academy, Institute of Health and Care Sciences, University of Gothenburg, Gothenburg, Sweden
- Department of Orthopaedics, Sahlgrenska University Hospital, Region Västra Götaland, Gothenburg, Sweden
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2
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Rasmussen N, Erichsen A, Christensen A, Frederiksen K, Nielsen M, Noe B, Sahl H, Viggers L. SUN-LB288: A Hospital Fighting Malnutrition. Better Food and Nutritional Care to Hospitalised Patients: A Pilot Study. Clin Nutr 2016. [DOI: 10.1016/s0261-5614(16)30644-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Erestam S, Erichsen A, Derwinger K, Kodeda K. A survey of surgeons' perception and awareness of intraoperative time utilization. Patient Saf Surg 2014; 8:30. [PMID: 25006350 PMCID: PMC4086263 DOI: 10.1186/1754-9493-8-30] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 06/19/2014] [Indexed: 12/14/2022] Open
Abstract
Background Surgical teams’ awareness of the time needed to perform specific phases of a surgical procedure is likely to improve communication in the operating theatre and benefit patient safety. The aim of this study was to assess surgeons’ awareness of time utilization and the actual time needed to perform specific phases of an operation. Methods A survey was conducted to examine the method and design for a larger study. Interviews were conducted with 18 surgeons, and surgical time was measured during 21 colon cancer resections. Correlation analyses were performed to explore the factors that might affect operating time. Results The surgical phase with the greatest variation in time was dissection/resection (43–308 minutes). On a group level, no statistically significant differences were found between estimated and measured surgical procedural times for partial or full resections (160.4 versus 173.0 minutes, p = 0.539). However, interindividual variation was substantial. There was a positive significant correlation between long duration of dissection/resection and longer time to close the abdomen (r = 0.464, p = 0.039), as well as between long duration of a hand-sewn anastomosis and time needed to close the abdomen (r = 0.536, p = 0.018). Conclusions It can be difficult for a single surgeon to estimate the time required for a partial or full surgical procedure. A larger study might provide additional time estimates and identify variables that affect surgical time. The data could be of interest in the planning and scheduling of surgical resources, thus improving theatre team communication and patient safety.
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Affiliation(s)
- Sofia Erestam
- Institute of Health and Care Sciences, Sahlgrenska University Hospital, Campus Östra, Gothenburg, Sweden ; Department of Anaesthesia, Surgery, and Intensive Care, Sahlgrenska University Hospital, Campus Östra, Gothenburg, Sweden
| | - Annette Erichsen
- Institute of Health and Care Sciences, Sahlgrenska University Hospital, Campus Östra, Gothenburg, Sweden ; Department of Anaesthesia, Surgery, and Intensive Care, Sahlgrenska University Hospital, Campus Östra, Gothenburg, Sweden
| | - Kristoffer Derwinger
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at University of Gothenburg, Campus Östra, Gothenburg, Sweden ; Department of Colorectal Surgery, Sahlgrenska University Hospital, Campus Östra, Gothenburg, Sweden
| | - Karl Kodeda
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at University of Gothenburg, Campus Östra, Gothenburg, Sweden ; Department of Colorectal Surgery, Sahlgrenska University Hospital, Campus Östra, Gothenburg, Sweden
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4
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Paus PN, Larsen EW, Sødal G, Erichsen A. Pancreatic affection after acute hypotonic hemodialysis. Acta Med Scand 2009; 212:83-4. [PMID: 6181656 DOI: 10.1111/j.0954-6820.1982.tb03174.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Four male outpatients, all on stable long-term hemodialysis, were by accident simultaneously exposed to hypotonic dialysate. Three of them developed increased serum amylase values and one died from the consequences of a fulminant pancreatitis, which had been verified by laparatomy.
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5
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Nicholson AG, Florio R, Hansell DM, Bois RM, Wells AU, Hughes P, Ramadan HK, Mackinlay CI, Brambilla E, Ferretti GR, Erichsen A, Malone M, Lantuejoul S. Pulmonary involvement by Niemann-Pick disease. A report of six cases. Histopathology 2006; 48:596-603. [PMID: 16623786 DOI: 10.1111/j.1365-2559.2006.02355.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIMS Although pulmonary involvement is a known cause of morbidity in Niemann-Pick disease, histological features in the lung are not well characterized. The purpose of this study is to document the histological features seen in pulmonary involvement by types B and C Niemann-Pick disease and to correlate them with clinical and imaging data. METHODS AND RESULTS Surgical lung biopsies from six patients (four with type B and two with type C disease) were reviewed and all showed diffuse endogenous lipid pneumonia, with lesser involvement of the interstitium by fibrosis and foamy macrophage accumulation. In type B disease only, there was also fine cytoplasmic vacuolation within the cytoplasm of ciliated epithelial cells. Neither disease showed foamy changes within pneumocytes. One patient had a bronchial cast removed on whole lung lavage. Electron microscopy showed abnormal lamellar inclusions within lysosomes of affected cells in type B disease. In patients with type C disease, biopsies were undertaken as part of investigations into acute respiratory failure in the context of multiorgan systemic presentation. Three patients with type B disease had clinical disease limited to the lung, all adults (mean age of 40 years) with unexplained diffuse parenchymal lung disease and mainly ground-glass shadowing on high-resolution computed tomography. CONCLUSIONS Niemann-Pick disease should be considered for any patient with unexplained diffuse endogenous lipid pneumonia, even when disease is limited to the lungs and presentation is during adulthood.
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Affiliation(s)
- A G Nicholson
- Department of Histopathology, Royal Brompton Hospital, London, UK.
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6
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Raabe NK, Sauer T, Erichsen A, Nesland JM, Fossaa SD. Breast cancer in the contralateral breast: incidence and histopathology after unilateral radical treatment of the first breast cancer. Oncol Rep 1999; 6:1001-7. [PMID: 10425294 DOI: 10.3892/or.6.5.1001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The objective of the study was to assess the 10-year cumulative risk and clinical risk factors for the development of a contralateral cancer and to compare the tumours histopathologically. Among 1980 consecutive radically treated breast carcinoma patients a separate malignant breast tumour was diagnosed in 90 and 74 could be histopathologically compared with the primary tumour. The 10-year cumulative risk was 6.5% (95% CI: 5-8%). There was no difference in 10-year cumulative risk in developing a second breast tumour comparing premenopausal (7.1%) with postmenopausal women (6.1%). The cumulative risk among premenopausal tamoxifen-treated women (19.3%) or among patients with relapse (13.8%) was significantly increased as compared to similar patients without tamoxifen or without relapse. Sixty-six percent of the tumours displayed different histopathology. Morphologically similar and different tumours developed almost equally among patients with synchronous tumours and in those with or without relapse. We conclude that a radically treated breast cancer patient has a 10-year cumulative risk of 6.5% to develop a new malignant breast tumour. In premenopausal women the tumour-protective effect of two years tamoxifen application seems questionable. Histopathological comparison of the bilateral breast tumours enables discrimination of bilateral breast tumours as two primaries in 2/3 of the patients with morphologically different tumours.
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Affiliation(s)
- N K Raabe
- Department of Clinical Oncology and Radiotherapy, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway
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7
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Eggesbø HB, Ringertz S, Haanaes OC, Dølvik S, Erichsen A, Stiris M, Kolmannskog F. CT and MR imaging of the paranasal sinuses in cystic fibrosis. Correlation with microbiological and histopathological results. Acta Radiol 1999; 40:154-62. [PMID: 10080727 DOI: 10.3109/02841859909177731] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To compare CT and MR findings of the paranasal sinuses in patients with cystic fibrosis (CF) with microbiology and histopathology. Further, to compare microbiology from the maxillary sinuses, nasopharynx and sputum. MATERIAL AND METHODS CT and MR imaging of the paranasal sinuses were performed in 10 CF patients. Endoscopy and maxillary sinus aspirates were obtained (guided by the MR findings) and analyzed microbiologically and histologically. Samples from the nasopharynx and sputum were analyzed microbiologically. RESULTS CT and MR were equal in displaying the extent of soft tissue masses, which at CT were homogeneous, while MR showed heterogeneous signals. MR images also demonstrated circumscribed areas with signal void at the STIR sequence with corresponding high to intermediate signal at the T1-weighted sequence. P. aeruginosa was frequently cultured from these areas which we named the "black hole sign". Maxillary sinus cultures revealed the same bacteria as nasopharynx and sputum cultures combined. CONCLUSION MR images were superior to CT in differentiating soft tissue masses in the paranasal sinuses in CF patients. Bacteria with potential for specialized iron uptake mechanisms were present in areas with signal void at the STIR sequence. Our hypothesis is that the MR "black hole sign" can be explained by paramagnetic properties related to bacterial agents.
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Affiliation(s)
- H B Eggesbø
- Department of Radiology, Aker University Hospital, Oslo, Norway
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8
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Eggesbø HB, Kroese A, Hansen G, Erichsen A. [The value of preoperative thoracic CT. 19 patients with bronchial cancer surgically treated]. Tidsskr Nor Laegeforen 1996; 116:2169-71. [PMID: 8801658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The incidence of bronchial carcinoma is increasing. The only curative treatment so far has been surgery. The correlation between preoperative CT thorax and peroperative/pathologic findings was evaluated in order to assess the value of preoperative CT thorax in patients with bronchial carcinoma. The thoracic CTs of 96 patients with bronchial carcinoma who were referred to our outpatient clinic from January 1992 to September 1994 were reviewed. Only 19 patients (20%) underwent surgery (seven pulmectomies, nine lobectomies, two wedge resections, one explorative thoracotomy). The remaining 77 patients received either irradiation, chemotherapy or other palliative treatment. The tumours were classified according to the TNM system (T = tumour, N = node, M = metastases) of UICC (Union Internationale Centre le Cancer). In 11 of the 19 patients who underwent surgery a correct TN classification was assessed at CT, while in four the T classification and in another four the N classification was changed after peroperative and pathologic assessment. CT showed a slight tendency to overestimate T classification. As for the N classification, overestimation and underestimation were equal. We conclude that CT thorax is valuable in the preoperative staging of bronchial carcinoma.
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Affiliation(s)
- H B Eggesbø
- Røntgenavdelingen, Patologisk anatomisk laboratorium, Oslo
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9
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Kingo M, Erichsen A, Sørensen G. [Child nutrition--out of confusion]. Sygeplejersken 1994; 94:22-3. [PMID: 7817310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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10
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Abstract
The preservation of morphological details in frozen sections subjected to microwave-assisted fixation was compared with that in frozen sections subjected to snap fixation with either formalin/ethanol or ethanol alone. Especially nuclear details were better preserved after short microwave fixation. Ethanol alone gave the poorest results, with loss of nuclear details in the majority of the cases. In this study there was no significant difference between the morphological results obtained with a cheap domestic oven and that with a specialized microwave processor. Microwave-assisted fixation in frozen sections is a simple, rapid method. It is recommended for use in routine laboratories.
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Affiliation(s)
- W Reed
- Department of Pathology, Aker Hospital, Oslo, Norway
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11
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Erichsen A. [Testicular germ cell tumor--pathogenetic aspects]. Tidsskr Nor Laegeforen 1991; 111:585-6. [PMID: 1848953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The article reviews recent findings in the carcinogenesis of male germ cell tumours. Histologic, cytogenetic and cell molecular studies indicate that the embryonal germ cell-the gonocyte-is the precursor cell. A step-wise modification of the gonocyte with gradual loss of genetic material, and participation of different oncogenes like myc and ras, are probably of great significance, but the modes and extent are unknown. The histogenesis of the different subtypes of germ cell tumours is still obscure.
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Affiliation(s)
- A Erichsen
- Patologisk anatomisk laboratorium Aker sykehus, Oslo
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12
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Erichsen A. [Testicular germ cell tumors--epidemiology and risk factors]. Tidsskr Nor Laegeforen 1990; 110:2541-3. [PMID: 2219018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
An increasing incidence of testicular germ cell tumours has been observed in many white populations in this century. Ethnic genetic implications and lifestyle seem to influence the development of testicular cancers, whereas the influence of intrauterine conditions is under debate. Epidemiologic studies cannot explain the increasing incidence among young men. The age variation of incidence and histologic type indicates at least two different aetiological mechanisms. Testicular cancers among young men are most probably due to gonadal dysgenesis, whereas in old men they reflect the general increased risk of cancer with old age. The increased risk of developing testicular germ cell tumours among cryptorchid young men supports the gonadal dysgenesy hypothesis.
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Affiliation(s)
- A Erichsen
- Patologisk anatomisk laboratorium Aker sykehus, Oslo
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13
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Erichsen A, Hansson V. A transplantable rat Leydig cell tumour. Properties of the prostaglandin E receptor. Acta Endocrinol (Copenh) 1989; 120:499-504. [PMID: 2541591 DOI: 10.1530/acta.0.1200499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In the present paper we have examined the properties of the prostaglandin E (PGE) receptor in a transplantable rat Leydig cell tumour (H-540). It appears that PGE1 and PGE2 share a common receptor in membrane particles from this Leydig cell tumour. From saturation analysis and modified Hofstee plots, the specific binding sites for PGE1 can be divided into a high (25%) and low affinity state (75%) with apparent equilibrium constants of dissociation (Kd) of 2.4.10(-7) mol/l and 4.4.10(-6) mol/l, respectively. Association rate kinetics at different temperatures employing 5.10(-9) mol/l [3H]PGE1 showed that specific binding was time- and temperature-dependent. At 37 degrees C an apparent steady state was achieved after approximately 4 h incubation. The binding of [3H]PGE1 was very tight and no dissociation was observed at 20 degrees C during the first 20 h. The free PGE1 receptor appears to be very unstable. Binding was reduced rapidly by storage at 0 degrees C, by freezing and thawing of membrane particles, and by incubation of concentrated membrane particles. Specificity curves showed that PGA1 and PGA2 displaced [3H]PGE1 from receptor to a somewhat lesser degree than PGE2 and PGE1, whereas PGs of the B, D, I and F series had little or no effect. The fact that inhibition of [3H]PGE1 binding by cold PGE1 occurred in the same concentration range as PGE1 activation of adenylate cyclase, indicates that the specific binding of PGE observed here represents functional receptors coupled to the adenylate cyclase.
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Affiliation(s)
- A Erichsen
- Institute of Pathology, National Hospital, University of Oslo, Norway
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14
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Aspestrand F, Erichsen A, Kolbenstvedt A, Knutsen H. Radiological appearance of the ampulla of Vater. Radiologe 1988; 28:533-5. [PMID: 3194521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The localized dilatation below the confluence of the bile and pancreatic ducts is known as the ampulla of Vater. The purpose of the present study was to delineate the radiological features of the choledochopancreaticoduodenal junction, with special reference to ampullar formation in this region. This was done by specimen radiography and review of the films from 255 examinations with endoscopic retrograde cholangiopancreatography. Full evaluation was possible in 200 cases. Ampullar dilatation was observed in only 9 (5.1%) of the 175 patients with a common terminal opening. No ampullar dilatation was observed in the 25 patients with separate openings of the duct. The appearance in the presence of ampullar dilatation is described. The distal end of the common bile duct, below its confluence with Wirsung's duct, has been known as the ampulla of Vater for nearly 130 years. This is a most important diminutive region of the human body, but there is little in the literature concerning its radiological presentation. In this report a radiological study is presented on the choledochopancreaticoduodenal junction.
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Affiliation(s)
- F Aspestrand
- Department of Diagnostic Radiology, National Hospital, Oslo, Norwegen
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15
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Ertzeid G, Erichsen A. [Laser treatment of cervix dysplasia. Who is to be treated?]. Tidsskr Nor Laegeforen 1988; 108:2712-4. [PMID: 3206478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Erichsen A, Clausen OP, Torjesen P, Dahl E, Wetteland P, Hansson V. A transplantable rat Leydig cell tumour. 6. Effect of castration and hypophysectomy on tumour growth, morphology and plasma levels of pituitary hormones and testosterone. Acta Endocrinol (Copenh) 1988; 119:291-300. [PMID: 3140553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Growth rate and morphology were studied in a transplantable rat Leydig cell tumour (H-540) grown in intact, castrated and hypophysectomized rats. The plasma levels of pituitary hormones and testosterone were measured in the same rats. The results can be summarized as follows: 1. The growth curves of tumours in intact and castrated rats were S-shaped and very similar during the observation period of three weeks. 2. In hypophysectomized rats, the onset and progression of tumour growth were delayed, compared with intact and castrated rats. 3. The thymidine labelling index as well as the size of the S and G2 phase compartments were decreased in tumours greater than 10 g compared with smaller tumours and tumours grown in hypophysectomized rats. 4. Testosterone concentrations in plasma correlate well with increasing tumour weight up to approximately 10-15 g in intact and castrated rats. 5. Plasma testosterone levels in tumour-bearing hypophysectomized rats were 7-fold higher than those of corresponding intact and castrated rats. 6. In castrated rats, suppression of LH production occurs by very small tumours (less than 2 g), whereas FSH levels show a gradual decrease with increasing tumour size. PRL production was independent of castration, tumour weight, and testosterone levels. 7. In spite of no major differences in cell morphology, the morphometric analysis revealed a reduction in tumour cell size and nuclear size in hypophysectomized rats compared with intact and castrated rats. It is concluded that pituitary hormones stimulate tumour growth, but surprisingly appear to reduce the secretion of testosterone from these tumours.
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Affiliation(s)
- A Erichsen
- Institute of Pathology, Rikshospitalet, University of Oslo, Norway
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17
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Erichsen A, Levy FO, Golf S, Hansson V. A transplantable rat Leydig cell tumor--5. Cellular localization of beta-adrenergic and prostaglandin receptors and their effects on testosterone production. J Steroid Biochem 1988; 31:41-8. [PMID: 2840532 DOI: 10.1016/0022-4731(88)90203-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The cellular localization of beta-adrenergic and prostaglandin (PG) receptors and their effects on adenylate cyclase activity (AC) and testosterone production in vitro were investigated in a transplantable rat Leydig cell tumor (H-540). Separation of the tumor cells in Percoll gradients revealed that the specific binding of [3H]PGE1 and [125I]Cyanopindolol was found in the same fraction as that of [125I]LH. This fraction--judged by light microscopy of smears--consisted of tumor Leydig cells. In addition, [125I]cyanopindolol was found specifically bound in the red blood cell fraction. In the Leydig tumor cells, approx 25% of the beta-adrenergic receptors was identified as beta 1-receptors, whereas approx 75% of the receptors were of the beta 2-subtype. The AC in Percoll purified Leydig tumor cells was stimulated by hCG (6-fold), PGE1 (2-fold), PGE2 (1.5-fold), PGI1 (2-fold) and isoproterenol (2-fold). The AC in the red blood cell fraction was stimulated by isoproterenol whereas the PGs and hCG had little or no effect. hCG, isoproterenol and PGE1 were able to stimulate testosterone production in vitro. At 44 h incubation, PGE1 was the most potent stimulator of testosterone production. In conclusion, tumor Leydig cells possess hCG, PGE1, PGI2 and beta-adrenergic receptors coupled to the AC. PGE1 and beta-adrenergic agonists stimulate testosterone production after prolonged incubation in vitro.
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Affiliation(s)
- A Erichsen
- Institute of Pathology, Rikshospitalet, University of Oslo, Norway
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18
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Golf S, Bjørnerheim R, Erichsen A, Hansson V. Relative selectivity of different beta-adrenoceptor antagonists for human heart beta 1- and beta 2-receptor subtypes assayed by a radioligand binding technique. Scand J Clin Lab Invest 1987; 47:719-23. [PMID: 2891183 DOI: 10.1080/00365518709168936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The affinity constants of inhibition (Ki values) for both beta 1- and beta 2-receptor subtypes were determined for four different beta-adrenoceptor antagonists by a radioligand binding technique in a human myocardial membrane preparation. The radioligand was the high affinity antagonist [125I]-(-)-iodocyanopindolol (ICYP), and the drugs tested were atenolol, metoprolol, ICI 141,292 and ICI 118,551. Different concentrations of the drugs at test were allowed to compete with a constant concentration of ICYP for the specific binding sites (beta-receptors). Ki values for beta 1- and beta 2-receptors for each beta-adrenoceptor antagonist were developed from these data by computer calculations. Atenolol and metoprolol were found to differ slightly regarding potency (absolute Ki values) and to be practically equal regarding relative selectivity (approx. 40; i.e. ratio between high and low Ki values), while ICI 141,292 was found to have slightly higher relative selectivity (approx. 60) and much higher potency. All these drugs exhibited highest affinity for the beta 1-receptor population. In contrast, ICI 118,551 exhibited a very high relative selectivity (approx. 300) with highest affinity for the beta 2-receptor subtype. The method represents a good supplement to physiological and clinical examinations of selectivity of beta-blockers, and offers several advantages regarding simplicity, specificity and accuracy.
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Affiliation(s)
- S Golf
- Medical Department B, University Hospital, Oslo, Norway
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19
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Erichsen A, Jahnsen T, Attramadal H, Andersen D, Hansson V. A transplantable rat Leydig cell tumor: binding properties, hormonal responsiveness, and tumor growth. Ann N Y Acad Sci 1984; 438:655-8. [PMID: 6100028 DOI: 10.1111/j.1749-6632.1984.tb38365.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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20
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Erichsen A, Jahnsen T, Attramadal H, Hansson V. A transplantable rat Leydig cell tumor—2. Adenylyl cyclase activation by prostaglandin E1, isoproterenol and glucagon. ACTA ACUST UNITED AC 1984; 21:545-8. [PMID: 6542613 DOI: 10.1016/0022-4731(84)90329-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The responsiveness of the membrane bound adenylyl cyclase (AC) system to various hormones and hormone analogues in a transplantable rat Leydig cell tumor (H-540) has been investigated and compared with that of interstitial tissue from normal adult rats. The results can be summarized as follows: The AC of the Leydig cell tumors was stimulated by isoproterenol, epinephrine, norepinephrine, dopamine, glucagon, PGE1, PGF2 alpha and LH/hCG. The AC of the Leydig cell tumors exhibited a much greater response to PGE1 than the AC in normal interstitial tissue (5-fold and 2-fold stimulation, respectively). The AC of the Leydig cell tumours also revealed a somewhat higher response to isoproterenol than the AC of interstitial tissue (2.5-fold and 2-fold, respectively). Adenylyl cyclase in both tissues were equally stimulated by glucagon (2-fold). The LH response in the Leydig cell tumors was only half of that found in normal Leydig cells. This study indicates, that in spite of the fact that tumor Leydig cells respond to LH and produce testosterone, the response pattern of the AC is different from that of normal Leydig cells.
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Erichsen A, Jahnsen T, Andersen D, Torjesen P, Hansson V. A transplantable rat Leydig cell tumor--1. LH and prolactin receptors and effects of the endocrine status of the host animal. J Steroid Biochem 1984; 21:539-43. [PMID: 6096631 DOI: 10.1016/0022-4731(84)90328-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We have examined the binding capacity and properties (affinity, specificity) of LH and prolactin (Prl) receptors in a transplantable rat Leydig cell tumor (H-540) grown in intact, castrated and hypophysectomized rats. LH receptors in adult rat testis and Prl receptors in the rat ventral prostate were examined simultaneously for comparison. The results can be summarized as follows: The qualitative properties (affinity, specificity) of LH and Prl receptors in tumor Leydig cells appear to be identical to those of corresponding receptors in non-tumor tissues. The levels of LH receptors in tumor Leydig cells are only some 1% of that present in normal Leydig cells from adult rats. Tumor Leydig cells grown in hypophysectomized rats had even lower levels of LH receptors; ca. 1/3 of that found in tumors from intact rats. The levels of Prl receptors in the tumor Leydig cells are almost as high as in normal Leydig cells from adult rats. In tumors grown in hypophysectomized rats, the levels of Prl receptors were much lower (ca. 20%) than in tumors from intact or castrated rats. There were great variations in the number of LH and Prl receptors in individual tumors, and there was a positive correlation (r = 0.88; P less than 0.01) between LH and Prl receptors in individual tumors. No differentiation toward a "LH receptor tumor" or "Prl receptor tumor" was observed. Thus, receptors for LH and Prl in tumor cells are qualitatively normal, but the number is greatly (LH) or moderately (Prl) reduced. These receptors in the tumor Leydig cells are stimulated by pituitary hormones.
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Jahnsen T, Attramadal H, Erichsen A, Hansson V. [Hormone sensitive adenylate cyclases]. Tidsskr Nor Laegeforen 1984; 104:1652-5. [PMID: 6089373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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Erichsen A, Laerum F. [Renal angiomyolipoma]. Tidsskr Nor Laegeforen 1984; 104:1309-11. [PMID: 6539964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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Holst N, Abyholm T, Erichsen A. Pregnancy rate after diagnostic curettage in the evaluation of infertility. Acta Eur Fertil 1983; 14:327-9. [PMID: 6673451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The Authors present a series of 200 infertile women, who underwent a diagnostic curettage as part of the evaluation of infertility. 18.6 per cent of the patients became pregnant after this procedure after correction for other causes of infertility. Most of the pregnancies were achieved within four cycles after the curettage. From this study, it seems that the removal of a pathological endometrium is not followed by pregnancy. To utilize the therapeutic potential of a diagnostic curettage in infertile women, it is suggested that regularly menstruating women with no history or clinical findings suggestive of tubal disease or endometriosis and without pathological lesions of the endometrium, should wait at least four cycles before the next invasive procedure (HSG or laparoscopy) is performed.
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Linnestad P, Erichsen A, Fausa O, Flaten O, Hanssen LE, Schrumpf E. The release of human pancreatic polypeptide, gastrin, gastric inhibitory polypeptide, and somatostatin in celiac disease related to the histological appearance of jejunal mucosa before and 1 year after gluten withdrawal. Scand J Gastroenterol 1983; 18:169-75. [PMID: 6143393 DOI: 10.3109/00365528309181579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Jejunal biopsies and the postprandial response of pancreatic polypeptide (PP), gastrin, gastric inhibitory polypeptide (GIP), and somatostatin have been examined in nine patients with celiac disease before and 1 year after gluten withdrawal. All presented initially with total villous atrophy of the jejunal mucosa. After gluten withdrawal five showed marked mucosal regeneration on light microscopy examination (responders) and four only moderate or no regeneration (nonresponders). Before treatment the celiac patients had enhanced gastrin response and normal PP response compared with normal controls. After gluten withdrawal the integrated gastrin release was reduced to normal in the responders (275 versus 114; p less than 0.05) but remained elevated in the nonresponders (231 versus 204). Postprandial PP release was similar before and after treatment regardless of the degree of mucosal regeneration. In the responders the integrated release of GIP was increased (180 versus 241; p less than 0.05), and the somatostatin release was enhanced (-2.6 versus 8.4; p less than 0.05) after gluten withdrawal. We conclude that the postprandial release of GIP and somatostatin increases and that the release of gastrin decreases when the intestinal mucosa is regenerated in celiacs on a gluten-free diet. The release of PP after food is not influenced by mucosal regeneration.
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Mohr CP, Gluck S, Erichsen A. Allergy history questionnaires. Ann Allergy 1981; 46:47-8. [PMID: 7458009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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