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Ritter O, Tordi N, Mourot L, Malika B, Laroche D, Besson D, Casillas J, Degano B. Étude de la ventilation au cours d’un exercice de pédalage excentrique dans la BPCO modérée à sévère. Rev Mal Respir 2016. [DOI: 10.1016/j.rmr.2015.10.480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ritter O, Lieseberg C, Maier- Leibnitz H, Papkow A, Schmeiser K, Bothe W. Untersuchung der Streuung von Positronen an Elektronen in der Wilsonschen Nebelkammer. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1951-0504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In einer "langsamen", mit Methan gefüllten Wilson-Kammer, die hier beschrieben wird, wird die Streuung von Positronen aus Cu64 an Elektronen untersucht. Aus 5000 Aufnahmen mit 2900 m ausgewerteter Positronenbahnlänge wird die Häufigkeit von Stößen mit verschiedener Energieübertragung im Energiebereich 100-400 ekV bestimmt und mit der Theorie von Möller-Bhabha verglichen. Innerhalb der experimentellen Unsicherheit besteht Übereinstimmung zwischen den beobachteten und den berechneten Absolutwerten. Ein Dreierstoß zwischen einem Positron und zwei Elektronen wurde beobachtet.
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Williams T, Hundertmark M, Schraut S, Schoenberger J, Nordbeck P, Voll S, Muehlfelder M, Elsner I, Ritter O. Eyes absent homolog 4 regulates p27Kip1 and aggravates pressure overload-induced adverse cardiac remodeling. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p3245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Nordbeck P, Bauer WR, Ritter O. Comments on 'Safe magnetic resonance image scanning of the pacemaker patient: current technologies and future directions'. Europace 2012; 14:1532; author reply 1532-3. [DOI: 10.1093/europace/eus112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Reiter T, Ritter O, Beer M, Petritsch B. An unusual finding after resuscitation: contusio cordis. Clin Res Cardiol 2012; 101:767-70. [PMID: 22476822 DOI: 10.1007/s00392-012-0449-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Accepted: 03/22/2012] [Indexed: 11/28/2022]
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Nordbeck P, Beer M, Geistert W, Kaufmann R, Köstler H, Pabst T, Warmuth M, Gensler D, Reiter T, Hoffmeister S, Jakob P, Ladd M, Quick H, Bauer W, Ritter O. Katheterablation bei Herzrhythmusstörungen unter MR-Echtzeitbildgebung. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0031-1300860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Gensler D, Fidler F, Ehses P, Warmuth M, Reiter T, Düring M, Ritter O, Ladd ME, Quick HH, Jakob PM, Bauer WR, Nordbeck P. MR safety: Fast T
1
thermometry of the RF-induced heating of medical devices. Magn Reson Med 2012; 68:1593-9. [PMID: 22287286 DOI: 10.1002/mrm.24171] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 12/01/2011] [Accepted: 12/29/2011] [Indexed: 11/11/2022]
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Kickuth R, Goltz JP, Reichling C, Kenn W, Hahn D, Ritter O. C-Arm Flachdetektor-CT in Kombination mit einem neuartigen elektromagnetischen Navigationssystem bei der Steuerung perkutaner Biopsien: Erste klinische Erfahrungen. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ritter O, Marggraf M, Weng A, Beer M, Hahn D, Köstler H. Absolutquantifizierung der myokardialen Perfusion in der 3T MRT in freier Atmung. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Goltz JP, Ritter O, Kellersmann R, Kenn W, Bühler C, Hahn D, Kickuth R. Endovaskuläre Behandlung von Patienten mit einer kritischen Ischämie der unteren Extremität: 6-Monats-Ergebnisse nach Implantation eines neuen, selbst-expandierbaren helikalen Nitinolstents (SUPERA®). ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hofmann U, Hu K, Walter F, Burkard N, Ertl G, Bauersachs J, Ritter O, Frantz S, Bonz A. Pharmacological pre- and post-conditioning with the sphingosine-1-phosphate receptor modulator FTY720 after myocardial ischaemia-reperfusion. Br J Pharmacol 2010; 160:1243-51. [PMID: 20590616 DOI: 10.1111/j.1476-5381.2010.00767.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Our recent experiments demonstrated that the Sphingosine-1-phosphate (S1P) receptor agonist FTY720 (2-amino-2-[2-(4-octylphenyl)ethyl]-1,3-propanediol hydrochloride) improves recovery of function after myocardial ischaemia-reperfusion ex vivo. Therefore, we tested the hypothesis that pharmacological post-conditioning with FTY720 reduces infarct size after myocardial ischaemia-reperfusion in vivo. EXPERIMENTAL APPROACH Myocardial ischaemia was induced in Wistar rats by ligation of the left coronary artery for 45 min. FTY720 (0.5 mg kg(-1)) was applied i.p. either once, before reperfusion, or twice, 24 h before myocardial ischaemia and before reperfusion. After 24 h reperfusion, we determined infarct size by triphenyltetrazolium chloride staining and granulocyte infiltration by immunohistochemistry. Tumour necrosis factor-alpha (TNF)-alpha concentration was determined by elisa. S1P receptor expression was studied by Western blot. Calcium transients were evaluated in Indo-1-loaded cardiomyocytes. KEY RESULTS In both groups, FTY720 significantly reduced lymphocyte count in peripheral blood. FTY720 treatment attenuated granulocyte infiltration and TNF-alpha protein expression in reperfused myocardium. However, both treatment regimens were not able to reduce infarct size. FTY720 increased mortality due to induction of fatal ventricular tachyarrhythmias when administered once before reperfusion, but protected against reperfusion arrhythmias when given 24 h prior to ischaemia. Pretreatment selectively down-regulated S1P(1) receptor expression within the myocardium. S1P receptor agonists did not induce calcium deregulation in cardiomyocytes. CONCLUSIONS AND IMPLICATIONS FTY720 applied during reperfusion did not reduce infarct size but increased mortality during myocardial ischaemia-reperfusion due to induction of arrhythmias. Pretreatment with FTY720 before ischaemia abrogated the deleterious pro-arrhythmic effects without reducing infarct size.
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Miescher P, Ritter O. Purpura thrombopénique par allergie à la digitoxine. Int Arch Allergy Immunol 2009. [DOI: 10.1159/000228029] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Hudelist G, Oberwinkler K, Singer C, Tuttlies F, Rauter G, Ritter O, Keckstein J. Die kombinierte Anwendung von klinischer Untersuchung und transvaginal-Ultraschall (TVS) zur präoperativen Diagnose der tief infiltrierenden Endometriose. Geburtshilfe Frauenheilkd 2009. [DOI: 10.1055/s-0029-1225238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Hudelist G, Oberwinkler K, Singer C, Tuttlies F, Rauter G, Ritter O, Keckstein J. Combination of transvaginal sonography and clinical examination for preoperative diagnosis of pelvic endometriosis. Hum Reprod 2009; 24:1018-24. [DOI: 10.1093/humrep/dep013] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Fattorusso V, Ritter O. Aperçu statistique sur quelques variations constitutionnelles du système cardio-vasculaire. Cardiology 2008. [DOI: 10.1159/000164835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Maier LS, Maack C, Ritter O, Böhm M. Hotline update of clinical trials and registries presented at the German Cardiac Society meeting 2008. Clin Res Cardiol 2008; 97:356-63. [DOI: 10.1007/s00392-008-0664-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Accepted: 04/08/2008] [Indexed: 11/25/2022]
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Hudelist G, Oberwinkler KH, Rauter G, Tuttlies F, Ritter O, Keckstein J. Endometriose – Wertigkeit der klinischen und transvaginal-Ultraschall (TVS) Untersuchung zur präoperativen Diagnosestellung. Geburtshilfe Frauenheilkd 2008. [DOI: 10.1055/s-2008-1078323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Fruscalzo A, Tuttlies F, Ritter O, Rauter G, Kandolf O, Oberwinkler KH, Pasterk C, Keckstein J. Gynaecological examination coupled with transvaginal ultrasound in the diagnosis of rectosigmoid endometriosis. Geburtshilfe Frauenheilkd 2007. [DOI: 10.1055/s-2007-989152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Weckmann U, Ritter O, Jung A, Branch T, de Wit M. Magnetotelluric measurements across the Beattie magnetic anomaly and the Southern Cape Conductive Belt, South Africa. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2005jb003975] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ritter O, Hoffmann-Rothe A, Bedrosian PA, Weckmann U, Haak V. Electrical conductivity images of active and fossil fault zones. ACTA ACUST UNITED AC 2005. [DOI: 10.1144/gsl.sp.2005.245.01.08] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractWe compare recent magnetotelluric investigations of four large fault systems: (i) the actively deforming, ocean-continent interplate San Andreas Fault (SAF); (ii) the actively deforming, continent-continent interplate Dead Sea Transform (DST); (iii) the currently inactive, trench-linked intraplate West Fault (WF) in northern Chile; and (iv) the Waterberg Fault/Omaruru Lineament (WF/OL) in Namibia, a fossilized intraplate shear zone formed during early Proterozoic continental collision. These fault zones show both similarities and marked differences in their electrical subsurface structure. The central segment of the SAF is characterized by a zone of high conductivity extending to a depth of several kilometres and attributed to fluids within a highly fractured damage zone. The WF exhibits a less pronounced but similar fault-zone conductor (FZC) that can be explained by meteoric waters entering the fault zone. The DST appears different as it shows a distinct lack of a FZC and seems to act primarily as an impermeable barrier to cross-fault fluid transport. Differences in the electrical structure of these faults within the upper crust may be linked to the degree of deformation localization within the fault zone. At the DST, with no observable fault-zone conductor, strain may have been localized for a considerable time span along a narrow, metre-scale damage zone with a sustained strength difference between the shear plane and the surrounding host rock. In the case of the SAF, a positive correlation of conductance and fault activity is observed, with more active fault segments associated with wider, deeper and more conductive fault-zone anomalies. Fault-zone conductors, however, do not uniquely identify specific architectural or hydrological units of a fault. A more comprehensive whole-fault picture for the brittle crust can be developed in combination with seismicity and structural information. Giving a window into lower-crustal shear zones, the fossil WF/OL in Namibia is imaged as a subvertical, 14 km-deep, 10 km-wide zone of high and anisotropic conductivity. The present level of exhumation suggests that the WF/OL penetrated the entire crust as a relatively narrow shear zone. Contrary to the fluid-driven conductivity anomalies of active faults, the anomaly here is attributed to graphitic enrichment along former shear planes. Once created, graphite is stable over very long time spans and thus fault/shear zones may remain conductive long after activity ceases.
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Ritter O, Bonz A, Strotmann J, Langenfeld H. Myokardinfarkt nach Influenza-Schutzimpfung. ACTA ACUST UNITED AC 2003; 92:962-5. [PMID: 14634767 DOI: 10.1007/s00392-003-0983-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2003] [Accepted: 06/20/2003] [Indexed: 11/26/2022]
Abstract
Influenza is a common disease in the population. Influenza vaccination is performed routinely and is usually well tolerated. Minor local or systemic side effects like fever and myalgia are described. Rarely there are more severe adverse events. Systemic vasculitis has been reported in some cases. In this case we report on a female patient with secondary vasculitis and myocardial infarction after influenza vaccination. The patient received cortisol and recovered. The literature about influenza vaccination, its side effects and recommendations about vaccination in patients with coronary artery disease is reviewed.
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Ritter O, Haase H, Schulte HD, Lange PE, Morano I. Remodeling of the hypertrophied human myocardium by cardiac bHLH transcription factors. J Cell Biochem 1999; 74:551-61. [PMID: 10440925 DOI: 10.1002/(sici)1097-4644(19990915)74:4<551::aid-jcb5>3.3.co;2-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The basic helix-loop-helix transcription factors eHAND and dHAND are involved in developmental cardiac growth and differentiation. We investigated HAND gene expression in the normal and in the hypertrophied right and left ventricle of patients with tetralogy of Fallot (ToF) and hypertrophic obstructive cardiomyopathy (HOCM). HAND mRNA was constitutively expressed in the hypertrophied heart and increased in the hypertrophic tissue of both patient groups. HAND genes had a complementary left-right cardiac asymmetry of expression with dHAND predominantly in the right and eHAND in the left ventricle. The two cardiac bHLH factors have the ability to form heterodimers with the ubiquitous bHLH protein E12, subsequently recognizing E-boxes in the promoter region of target genes like ALC-1. We found a highly significant positive correlation between HAND and ALC-1 mRNA. The total ALC-1 protein level in ToF was smaller than in HOCM, although ALC-1 mRNA as well as HAND mRNA levels were significantly higher. ToF patients expressed around four times more ALC-1 mRNA for similar amounts of ALC-1 than HOCM patients. Suggesting disturbed ALC-1 translation in ToF, we found ALC-1 antisense mRNA expression in the hypertrophied, but not in the normal, ventricles. The higher the antisense/sense ALC-1 mRNA ratio, the lower ALC-1 protein was expressed.
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Ritter O, Luther HP, Haase H, Baltas LG, Baumann G, Schulte HD, Morano I. Expression of atrial myosin light chains but not alpha-myosin heavy chains is correlated in vivo with increased ventricular function in patients with hypertrophic obstructive cardiomyopathy. J Mol Med (Berl) 1999; 77:677-85. [PMID: 10569205 DOI: 10.1007/s001099900030] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The adult rodent heart adapts to increased work load by reexpression of its fetal genes, for example, beta-myosin heavy chain (MHC), in order to improve contractile function. However, the human ventricle regulates contractility by expression of atrial essential myosin light chain (ALC-1) rather than beta-MHC. We evaluated the impact of both mechanisms in patients with hypertrophic cardiomyopathy. MHC isoform expression was quantified at the mRNA and protein levels by reverse transcriptase polymerase chain reaction and immunoblotting, respectively. Although alpha-MHC mRNA was detected in control and hypertrophied human ventricular tissue, alpha-MHC protein was not observed. Similarly, we investigated the expression of ALC-1 by two-dimensional polyacrylamide gel electrophoresis and the clinical and hemodynamic parameters of the patients with hypertrophic cardiomyopathy. We found a significant positive correlation between ALC-1 protein expression and dP/dtmax in the hypertrophied human ventricle in vivo. Correlations between dP/dtmax and expression of protein for the ryanodine receptor and L-type Ca2+ channel were excluded. Our data suggest that reexpression of ALC-1 improves the contractile state of the adult human heart. We propose that two evolutionarily divergent compensatory mechanisms for increased work demand exist in the mammalian heart: MHC regulation in rodents and essential MLC regulation, of cardiac contractility, in humans.
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Abstract
Skeletal muscle contraction of Limulus polyphemus, the horseshoe crab, seemed to be regulated in a dual manner, namely Ca2+ binding to the troponin complex as well phosphorylation of the myosin light chains (MLC) by a Ca2+/calmodulin-dependent myosin light chain kinase. We investigated muscle contraction in Limulus skinned fibers in the presence of Ca2+ and of Ca2+/calmodulin to find out which of the two mechanisms prevails in Limulus skeletal muscle contraction. Although skinned fibers revealed high basal MLC mono- and biphosphorylation levels (0.48 mol phosphate/mol 31 kDa MLC; 0.52 mol phosphate/mol 21 kDa MLC), the muscle fibers were fully relaxed at pCa 8. Upon C2+ or Ca2+/calmodulin activation, the fibers developed force (357+/-78.7 mN/mm2; 338+/-69.7 mN/mm2, respectively) while the MLC phosphorylation remained essentially unchanged. We conclude that Ca2+ activation is the dominant regulatory mechanism in Limulus skeletal muscle contraction.
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Sussman JL, Lin D, Jiang J, Manning NO, Prilusky J, Ritter O, Abola EE. Protein Data Bank (PDB): database of three-dimensional structural information of biological macromolecules. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 1998; 54:1078-84. [PMID: 10089483 DOI: 10.1107/s0907444998009378] [Citation(s) in RCA: 437] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The Protein Data Bank (PDB) at Brookhaven National Laboratory, is a database containing experimentally determined three-dimensional structures of proteins, nucleic acids and other biological macromolecules, with approximately 8000 entries. Data are easily submitted via PDB's WWW-based tool AutoDep, in either mmCIF or PDB format, and are most conveniently examined via PDB's WWW-based tool 3DB Browser.
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