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Chandra M, Hertel M, Cahill S, Sakaguchi K, Khanna S, Mitra S, Luke J, Khau M, Mirabella J, Cropper A. Prevalence of Self-Reported Kidney Disease in Older Adults by Sexual Orientation: Behavioral Risk Factor Surveillance System Analysis (2014-2019). J Am Soc Nephrol 2023; 34:682-693. [PMID: 36735807 PMCID: PMC10103302 DOI: 10.1681/asn.0000000000000065] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 12/04/2022] [Indexed: 02/05/2023] Open
Abstract
SIGNIFICANCE STATEMENT Studies discusses CKD disparities by age, race and ethnicity, and socioeconomics. However, despite well-documented disparities in CKD risk factors in LGBT+ adults, limited literature addresses CKD prevalence in this population. This analysis uses Behavioral Risk Factor Surveillance System (2014-2019) data to compare self-reported kidney disease prevalence in LGBT+ older adults (older than 50 years) with their heterosexual peers. Our findings indicate that LGBT+ older adults have higher rates of self-reported kidney disease and a higher incidence of CKD risks including smoking, activity limitations, adverse health outcomes, and limited access to health care, housing, and employment. These results support increasing access to screening for CKD risk factors, providing culturally responsive health care, and addressing societal drivers of vulnerability in older LGBT+ adults. BACKGROUND Existing research documents disparities in CKD by age, race and ethnicity, and access to health care. However, research on CKD in lesbian, gay, bisexual, and trans (LGBT+) older adults, despite their higher rates of diabetes, heart disease, smoking, and alcohol use, is limited. METHODS Pooled data from the Behavioral Risk Factor Surveillance System (2014-2019) for 22,114 LGBT+ adults and 748,963 heterosexuals aged 50 and older were used to estimate the prevalence of self-reported kidney disease. Logistic regressions were used to compare older adults by sexual orientation. RESULTS Older LGBT+ men (adjusted odds ratio=1.3; 95% confidence interval [CI], 1.09-1.54) were more likely than their heterosexual counterparts to report kidney disease, after controlling for sociodemographic factors, health behaviors, access to health care, and self-reported coronary heart disease, HIV, and diabetes; LGBT+ men and women also reported higher incidences of known risk factors for CKD. For example, both LGBT+ men (odds ratio [OR]=1.39; [95% CI], 1.26-1.54) and LGBT+ women (OR=1.39; [95% CI], 1.25-1.55) were more likely to be smokers and have a higher incidence of activity limitations, adverse health outcomes, and limited access to health care, housing, and employment. CONCLUSION These results support increasing access to screenings for CKD risk factors, providing preventative education and culturally responsive and affirming care, and addressing other societal drivers of vulnerability in older LGBT+ adults. The findings also support the value of interventions that address the interaction between CKD risk factors and the social marginalization that older LGBT+ adults experience.
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Affiliation(s)
| | - Mollie Hertel
- NORC at the University of Chicago, Chicago, Illinois
| | | | | | - Saumya Khanna
- NORC at the University of Chicago, Chicago, Illinois
| | | | - Jordi Luke
- Office of Minority Health, Centers for Medicare & Medicaid Services, Baltimore, Maryland
| | - Meagan Khau
- Office of Minority Health, Centers for Medicare & Medicaid Services, Baltimore, Maryland
| | - Jack Mirabella
- Office of Minority Health, Centers for Medicare & Medicaid Services, Baltimore, Maryland
| | - Avareena Cropper
- Office of Minority Health, Centers for Medicare & Medicaid Services, Baltimore, Maryland
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Hertel M, Heiland M, Nahles S, von Laffert M, Mura C, Bourne PE, Preissner R, Preissner S. Real-world evidence from over one-million COVID-19 vaccinations is consistent with reactivation of the varicella-zoster virus. J Eur Acad Dermatol Venereol 2022; 36:1342-1348. [PMID: 35470920 PMCID: PMC9114991 DOI: 10.1111/jdv.18184] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [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: 01/07/2022] [Accepted: 04/21/2022] [Indexed: 12/01/2022]
Abstract
BACKGROUND Reactivation of the varicella-zoster virus (VZV), which causes herpes zoster (HZ, synonym: shingles) in humans, can be a rare adverse reaction to vaccines. Recently, reports of cases after COVID-19 vaccination have arisen. OBJECTIVES The aim of this study was to assess if the frequency of HZ is found to increase after COVID-19 vaccination in a large cohort, based on real-world data. As a hypothesis, the incidence of HZ was assumed to be significantly higher in subjects who received a COVID-19 vaccine (Cohort I) versus unvaccinated individuals (Cohort II). METHODS Initial cohorts of 1,095,086 vaccinated and 16,966,018 unvaccinated patients were retrieved from the TriNetX database, and were matched on age and gender in order to mitigate confounder bias. RESULTS After matching, each cohort accounted for 1,095,086 patients. For the vaccinated group (Cohort I), 2,204 subjects developed HZ within 60 days of COVID-19 vaccination, while among Cohort II, 1,223 patients were diagnosed with HZ within 60 days after having visited the clinic for any other reason (i.e., not vaccination). The risk of developing shingles was calculated as 0.20% and 0.11% for cohort I and cohort II, respectively. The difference was statistically highly significant (p < 0.0001; log-rank test). The risk ratio and odds ratio were 1.802 (95% confidence interval [CI] = 1.680; 1.932) and 1.804 (95% CI = 1.682; 1.934). CONCLUSIONS Consistent with the hypothesis, a higher incidence of HZ was statistically detectable post-COVID-19 vaccine. Accordingly, eruption of HZ may be a rare adverse drug reaction to COVID-19 vaccines. Even though the molecular basis of VZV reactivation remains murky, temporary compromising of VZV-specific T cell-mediated immunity may play a mechanistic role in post-vaccination pathogenesis of HZ. Note that VZV reactivation is a well-established phenomenon both with infections and with other vaccines (i.e., this adverse event is not COVID-specific).
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Affiliation(s)
- M Hertel
- Department of Oral and Maxillofacial Surgery, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
| | - M Heiland
- Department of Oral and Maxillofacial Surgery, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
| | - S Nahles
- Department of Oral and Maxillofacial Surgery, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
| | - M von Laffert
- Institue of Pathology, Universitätsklinikum Leipzig, Universität Leipzig, Liebigstr. 26, 04103, Leipzig
| | - Cameron Mura
- School of Data Science and Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA
| | - Philip E Bourne
- School of Data Science and Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA
| | - R Preissner
- Institute of Physiology and Science-, IT, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Philippstr. 12, 10115, Berlin, Germany
| | - S Preissner
- Department of Oral and Maxillofacial Surgery, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany
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Schäfgen B, Juskic M, Heil J, Harcos A, Radicke M, Hertel M, Schütz F, Sohn C, Golatta M. First proof-of-concept evaluation of the FUSION-X-US-II prototype for the performance of automated breast ultrasound in healthy volunteers. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- B Schäfgen
- Universitätsfrauenklinik Heidelberg, Brustzentrum
| | - M Juskic
- Universitätsfrauenklinik Heidelberg, Brustzentrum
| | - J Heil
- Universitätsfrauenklinik Heidelberg, Brustzentrum
| | - A Harcos
- Universitätsfrauenklinik Heidelberg, Brustzentrum
| | | | | | - F Schütz
- Universitätsfrauenklinik Heidelberg, Brustzentrum
| | - C Sohn
- Universitätsfrauenklinik Heidelberg, Brustzentrum
| | - M Golatta
- Universitätsfrauenklinik Heidelberg, Brustzentrum
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Hertel M, Sommer K. Modifizierte Rayleigh-Destillationsmethode zur schnellen Bestimmung atmosphärischer Verteilungsfaktoren von Aromastoffen. CHEM-ING-TECH 2007. [DOI: 10.1002/cite.200600147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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5
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Hertel M, Chujo Y, Faust R, M�llen K. Editorial ? New Features. Polym Bull (Berl) 2004. [DOI: 10.1007/s00289-004-0276-y] [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: 11/25/2022]
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Arieli D, Prisner TF, Hertel M, Goldfarb D. Resolving Mn framework sites in large cage aluminophosphate zeotypes by high field EPR and ENDOR spectroscopy. Phys Chem Chem Phys 2004. [DOI: 10.1039/b310800g] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
BACKGROUND Activin A, the homodimer of the activin/inhibin betaA subunit, has been shown to participate in cutaneous wound healing. In this study we intended to determine its part in gastric ulceration. METHODS Activin A expression was studied by immunohistochemistry and in situ hybridization in acetic-acid-induced chronic gastric ulcers in rat. The dynamics of this process were also assessed by quantitative real time RT-PCR and RNase protection assays (RPA). The effects of different doses of this cytokine on epithelial and mesenchymal cell proliferation were quantitated in vitro. RESULTS Low amounts of activin A and its mRNA were expressed by epithelia, endothelia and fibroblasts in intact gastric tissue. Granulation tissue of gastric ulcers and gastric glands adjacent to the ulcer rim expressed markedly increased amounts of activin protein as well as activin/inhibin betaA mRNA. RPA and RT-PCR studies revealed a more than 3-fold increase in the relative abundance of this mRNA. Activin A did not affect the proliferation rate of fibroblasts and epithelial cells in vitro. CONCLUSIONS Activin A participates in gastric ulcer healing in a similar fashion as in cutaneous wounding. Its expression on protein and mRNA level is markedly increased in ulcer base and rim.
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Affiliation(s)
- J C Becker
- Dept. of Medicine B, Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany
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8
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Abstract
A recent study from our laboratory demonstrated a strong upregulation of activin expression during cutaneous wound healing. To further analyze the role of activin A in skin morphogenesis and wound repair, we generated transgenic mice that overexpress activin A under the control of the keratin 14 promoter. The latter targets expression of transgenes to the basal, proliferating layer of the epidermis. Hetero- as well as homozygous transgenic animals were viable and fertile. However, they were smaller than non-transgenic littermates and they had smaller ears and shorter tails. Histological analysis of their skin revealed dermal hyperthickening, mainly due to the replacement of fatty tissue by connective tissue, and an increase in suprabasal, partially differentiated epidermal layers. After cutaneous injury, a strong enhancement of granulation tissue formation was observed. Furthermore, the extent of re-epithelialization was increased in some of the wounds. These data demonstrate that activin A is a potent stimulator of the wound healing process. Using an in vivo model of local brain injury, we found that activin A also plays a significant role in the early cellular response to neuronal damage. Expression of activin mRNA and protein is markedly upregulated within a few hours of injury. If applied exogenously, recombinant activin A is capable of rescuing neurons from acute cell death. Studying the interaction between bFGF, a well-established neuroprotective agent, which is currently being tested in stroke patients, and activin A, we arrived at the unexpected conclusion that it is the strong induction of activin A by bFGF which endows the latter with its beneficial actions in patients. These findings suggest that the development of substances directly targeting activin expression or receptor binding should offer new possibilities in the acute treatment of stroke and brain trauma.
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Affiliation(s)
- B Munz
- Max-Planck-Institute of Biochemistry, Am Klopferspitz 18a, D-82152, Martinsried, Germany
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Tretter YP, Hertel M, Munz B, ten Bruggencate G, Werner S, Alzheimer C. Induction of activin A is essential for the neuroprotective action of basic fibroblast growth factor in vivo. Nat Med 2000; 6:812-5. [PMID: 10888932 DOI: 10.1038/77548] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.4] [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: 11/08/2022]
Abstract
Exogenous application of neurotrophic growth factors has emerged as a new and particularly promising approach not only to promote functional recovery after acute brain injury but also to protect neurons against the immediate effect of the injury. Among the various growth factors and cytokines studied so far, the neuroprotective and neurotrophic profile of basic fibroblast growth factor (bFGF) is the best documented. Using an animal model of acute excitotoxic brain injury, we report here that the neuroprotective action of bFGF, which is now being tested in stroke patients, depends on the induction of activin A, a member of the transforming growth factor-beta superfamily. Our evidence for this previously unknown mechanism of action of bFGF is that bFGF strongly enhanced lesion-associated induction of activin A; in the presence of the activin-neutralizing protein follistatin, bFGF was no longer capable of rescuing neurons from excitotoxic death; and recombinant activin A exerted a neuroprotective effect by itself. Our data indicate that the development of substances influencing activin expression or receptor binding should offer new ways to fight neuronal loss in ischemic and traumatic brain injury.
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Affiliation(s)
- Y P Tretter
- Department of Physiology, University of Munich, Pettenkoferstr.12, D-80336 München, Germany
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Reuss B, Hertel M, Werner S, Unsicker K. Fibroblast growth factors-5 and -9 distinctly regulate expression and function of the gap junction protein connexin43 in cultured astroglial cells from different brain regions. Glia 2000. [DOI: 10.1002/(sici)1098-1136(200005)30:3<231::aid-glia3>3.0.co;2-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Reuss B, Hertel M, Werner S, Unsicker K. Fibroblast growth factors-5 and -9 distinctly regulate expression and function of the gap junction protein connexin43 in cultured astroglial cells from different brain regions. Glia 2000; 30:231-41. [PMID: 10756073] [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: 02/16/2023]
Abstract
Astroglial cells contribute to neuronal maintenance and function in the normal and diseased brain. Gap junctions formed predominantly by connexin43 (cx43) provide important pathways to coordinate astroglial responses. We have previously shown that fibroblast growth factor (FGF)-2, which occurs ubiquitously in the CNS, downregulates gap junction communication in cortical and striatal, but not in mesencephalic astroglial cells in vitro (Reuss et al. Glia 22:19-30, 1998). Other members of the FGF family expressed in the CNS include FGF-5 and FGF-9. We show that both FGF-5 and FGF-9, like FGF-2, downregulate astroglial gap junctions and functional coupling. However, their effects are strikingly different from different brain regions, with regard to astroglial cells. FGF-5 specifically affects mesencephalic astroglial cells without changing coupling of cortical and striatal astroglia, while FGF-9 reduces gap junctional coupling in astroglia from all three brain regions. Both cx43 mRNA and protein levels as well as functional coupling assessed by dye spreading are affected. To clarify whether brain region-specific effects of FGFs on astroglial coupling are due to differential expression of FGF receptors (FGFR), we monitored expression of the four known FGFR mRNAs in astroglial cultures by RT-PCR. Irrespective of their regional origin, astroglial cells express mRNAs for FGFR-2 and FGFR-3. In summary, our results provide evidence for an important role of FGF-2, -5, and -9 in a distinct, CNS region-specific regulation mechanism of astroglial gap junction communication. The molecular basis underlying the regionally distinct responsiveness of astrocytes to different FGFs may be sought beyond distinct FGFR expression.
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Affiliation(s)
- B Reuss
- Neuroanatomy and Center for Neuroscience, University of Heidelberg, Heidelberg, Germany.
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12
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Abstract
Recent studies have suggested a role of connective tissue growth factor (CTGF) in repair processes of the skin as well as in various types of fibrotic disease. However, a function of this molecule in central nervous system (CNS) repair has not been demonstrated yet. In this study we analysed the temporal and spatial expression pattern of CTGF after unilateral kainic acid lesions of the hippocampal CA3 region in mice. We found a strong induction of CTGF mRNA and protein expression in neurons and glial cells of the lesioned hippocampus. Interestingly, increased expression of this mitogen was accompanied by elevated levels of the extracellular matrix molecule fibronectin, which is a known target of CTGF action. Therefore, our data indicate a novel function of CTGF in postlesional restructuring of the hippocampus, where it possibly participates in glial scar formation.
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Affiliation(s)
- M Hertel
- Institute of Cell Biology, ETH-Hönggerberg, CH-8093 Zürich, Switzerland
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13
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Hertel M, Kersten U, Mischke R, Nolte I. [Long-term EKG in dogs: comparison between a computerized system and visual arrhythmia analysis]. Berl Munch Tierarztl Wochenschr 1999; 112:239-42. [PMID: 10472722] [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: 02/13/2023]
Abstract
Based on results of holter ecg recordings taken from 38 dogs the computerized analyses system turned out as method not exactly valuing the frequency and sensitivity of arrhythmias. Despite there was a significant correlation between the computerized and visual arrhythmia analysis for ventricular respectively supraventricular premature beats, in individual cases there was an important aberration between the particular values.
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Affiliation(s)
- M Hertel
- Klinik für kleine Haustiere, Tierärztlichen Hochschule Hannover
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Louwagie M, Hertel M. Give-and-take in an ecumenical system. HealthEast St. Joseph's shared its traditions and gained a better balance. Health Prog 1997; 78:39-42. [PMID: 10166698] [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: 02/11/2023]
Abstract
When St. Joseph's Hospital in St. Paul, MN, owned and operated by the Sisters of St. Joseph of Carondelet, joined the ecumenical HealthEast healthcare system in 1987, many observers were skeptical of the venture's success. But an emphasis on their shared Judeo-Christian values has enabled the Catholic, Lutheran, and Baptist facilities to build a strong system. The beginnings of the merger were difficult, as facilities closed, others expanded their services, and staff shifted between them. An open communications policy between HealthEast leaders and staff members and dedication to the mission of healthcare that all the system facilities shared helped blend denominational identity and traditions at each member hospital and establish a corporate identity. The HealthEast system has adopted some of St. Joseph's policies and practices, particularly in the areas of mission, ethics, and spiritual care. HealthEast St. Joseph's has also benefited from being part of the HealthEast system, gaining a more diverse staff respectful of each others' beliefs, expanded spiritual care, and the means to continue serving its community. HealthEast plans to discontinue inpatient services at HealthEast St. Joseph's in downtown St. Paul and build a suburban facility, but the Sisters of St. Joseph of Carondelet are working with HealthEast to assess the downtown community's healthcare needs, especially among the homeless and immigrant populations, and ensure those needs will continue to be met.
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Affiliation(s)
- M Louwagie
- HealthEast St. Joseph's Hospital, St. Paul, MN, USA
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Hertel M, Murlat B, Kersten U. [Longterm ECG in the dog]. Tierarztl Prax 1996; 24:144-8. [PMID: 8650683] [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: 02/01/2023]
Abstract
Holter monitoring was obtained from 44 clinically normal dogs and 68 dogs with heart disease or being suspicious for a cardiopathy. Several employments of the holter monitoring are shown by means of some examples. This method proved to be effective in the diagnosis of syncopes and the review of the therapy of arrhythmias. Limits and difficulties are discussed.
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Affiliation(s)
- M Hertel
- Klinik für kleine Haustiere der Tierärztlichen Hochschule Hannover
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Geiger AW, Zarubin AM, Deiwick M, Asfour B, Fahrenkamp A, Hertel M, von Bally G, Scheld HH. Comparative analysis of glutaraldehyde-preserved porcine xenografts and fresh or glutaraldehyde-treated human aortic valves by holographic interferometry. Cardiovasc Surg 1994; 2:693-7. [PMID: 7858986] [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: 01/27/2023]
Abstract
Although calcification and degeneration are recognized as the main causes of bioprosthetic heart valve failure, the reasons for such failure are not well understood. Hidden tissue anomalies in the valves may be the origin of later calcification. Application of hologram interferometry for non-destructive testing enables the detection of such tissue anomalies. A comparative study by holographic interferometry of ten porcine bioprosthetic valves (seven Carpentier-Edwards SAV, two BioImplant and one Valcor) with five human aortic valves before and after glutaraldehyde treatment is presented. Whereas irregularities were detected in the interferograms of eight out of ten bioprostheses, no similar distorted fringe pattern was found in the holographic interferograms of human specimens. The present results suggest that tissue abnormalities exist in standard bioprosthetic valves which are absent in human ones. These irregularities may be the origin of later calcification and valvular dysfunction.
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Affiliation(s)
- A W Geiger
- Department of Thoracic and Cardiovascular Surgery, University of Münster, Germany
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Bohlen H, Manzke O, Engert A, Hertel M, Hippler-Altenburg R, Diehl V, Tesch H. Differentiation of cytotoxicity using target cells labelled with europium and samarium by electroporation. J Immunol Methods 1994; 173:55-62. [PMID: 8034986 DOI: 10.1016/0022-1759(94)90283-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [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: 01/28/2023]
Abstract
We report the simultaneous use of europium-DTPA (Eu-DTPA) and samarium-DTPA (Sm-DTPA) in cytotoxicity experiments to analyze simultaneously LAK and NK cell lysis and to differentiate between specific target lysis and bystander killing. The target cells were either labelled with Eu-DTPA or Sm-DTPA chelates by electroporation, which permits the use of target cell lines or primary leukemic B cells (B-CLL) that cannot be labelled by the conventional dextran-sulphate method. The release of europium and samarium reaches a maximum at comparable time intervals (2-3 h). Due to the shorter counting interval within the samarium window the labelling efficiency is about ten times less efficient compared to europium. Using europium as label for the LAK target Daudi and samarium as label for the NK sensitive cell line K562 the differentiation of LAK versus NK activity can be performed in a single culture assay. Also, the killing of B cells and bystander cells by cytotoxic T cells was analyzed in a system where T cells were redirected to B cells through CD3 x CD19 bispecific antibodies. In fact, no bystander killing was noted when bispecific antibodies were used to bridge cytotoxic T cells to the B cells. This approach provides a simple non-radioactive method for evaluating cytotoxicity against two different cells in a single culture well.
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Affiliation(s)
- H Bohlen
- Klinik I für Innere Medizin, Universität zu Köln, Germany
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18
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Abstract
In the present work we show with different binding assays chicken gizzard myoglobin is able to bind fatty acids and bromosulphophthalein (BSP) in vitro. The fatty acid binding depends on the oxygenation of the myoglobin. Freshly prepared chicken gizzard, chicken or bovine heart myoglobin have a high fatty acid binding capability. However, when oxy-myoglobin in converted to met-myoglobin by dialysis against acidic buffer at high ionic strength (or when commercially available myoglobins are used) a 60-70% lower fatty acid binding capacity is found. Like bovine serum albumin (BSA), gizzard myoglobin has the highest affinity for unsaturated fatty acids and a lower affinity for saturated fatty acids or dyes. Chicken gizzard smooth muscle myoglobin may function as an additional fatty acid binding protein in vivo.
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Affiliation(s)
- F M Götz
- Institut für Zoologie, Technische Hochschule Darmstadt, Germany
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19
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Geiger AW, Zarubin A, Fahrenkamp A, Hertel M, von Bally G, Scheld HH. Non-destructive evaluation of prosthetic heart valves by holographic interferometry. J Heart Valve Dis 1993; 2:343-7. [PMID: 8269130] [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: 01/29/2023]
Abstract
Dysfunction of prosthetic heart valves is a common complication after heart valve replacement, affecting both biologic and mechanical prostheses. A preoperative, non-destructive test of each individual valve may help to prevent the implantation of a valve which has material weaknesses. To this end we developed a technique for testing heart valve prostheses by holographic interferometry. The advantage of this technique is that it provides a non-contact, non-destructive, highly sensitive three dimensional analysis of the valve under loading. Samples of several mechanical and biologic valve substitutes were investigated. Deformations of the valve, due to small pressure differences applied to the samples in a specially developed test chamber, were recorded by double exposure holography. A fringe pattern superimposed on the image of the valve reconstructed from the hologram clearly indicates the presence of even the slightest defect in the valve material. Our experimental results demonstrate the ability of non-destructive holographic screening testing to detect defects or weaknesses which may potentially lead to dysfunction in replacement valves.
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Hertel M, Kiebert C, DeJoseph JF. The photographic image process. Superv Nurse 1980; 11:36-8. [PMID: 6905289] [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: 01/22/2023]
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