Sohns, Jan Martin

[["dc.bibliographiccitation.artnumber","433"],["dc.bibliographiccitation.journal","SpringerPlus"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Fasshauer, Martin"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.date.accessioned","2018-11-07T09:36:37Z"],["dc.date.available","2018-11-07T09:36:37Z"],["dc.date.issued","2014"],["dc.description.abstract","Introduction: A 66-years old man suffering from coronary artery disease appeared without symptoms for routine follow-up in our clinic. Case description: The echocardiogram revealed a tumorous mass of the right atrium and right ventricle. In the past, coronary revascularization with venous grafts of the right coronary artery and circumflex artery as well as internal mammaria graft to the left anterior descending artery was performed 20 years before. The general clinicians presented the case to the surgeons and it was decided to perform cardiac MRI as a preoperative diagnostic modality. Discussion and evaluation: Following cardiac magnetic resonance imaging (MRI) showed a mass in the pericardium in the right atrioventricular groove with thrombotic material. Due to the MRI the patient underwent coronary angiography to confirm an aneurysm. Conclusions: The learning points from this case are that cardiac MRI is a very useful tool for further evaluation of suspected cardiac masses and should be performed for further characterization."],["dc.identifier.doi","10.1186/2193-1801-3-433"],["dc.identifier.isi","000359078400004"],["dc.identifier.pmid","25184106"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10853"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32660"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","2193-1801"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Giant bypass aneurysm, a cause of suspected cardiac mass"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1149"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","European Radiology"],["dc.bibliographiccitation.lastpage","1156"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Fasshauer, Martin"],["dc.contributor.author","Krüwel, Thomas"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Stahnke, Vera C."],["dc.contributor.author","Rave-Fränk, Margret"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Sohns, Jan M."],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Schuster, Andreas"],["dc.contributor.author","Ritter, Christian"],["dc.contributor.author","Lotz, Joachim"],["dc.date.accessioned","2020-12-10T14:10:11Z"],["dc.date.available","2020-12-10T14:10:11Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s00330-017-5056-9"],["dc.identifier.eissn","1432-1084"],["dc.identifier.issn","0938-7994"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70672"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Absence of DNA double-strand breaks in human peripheral blood mononuclear cells after 3 Tesla magnetic resonance imaging assessed by γH2AX flow cytometry"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e109164"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Kowallick, Johannes Tammo"],["dc.contributor.author","Lamata, Pablo"],["dc.contributor.author","Hussain, Shazia T."],["dc.contributor.author","Kutty, Shelby"],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Fasshauer, Martin"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Bigalke, Boris"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Hasenfuß, Gerd"],["dc.contributor.author","Schuster, Andreas"],["dc.date.accessioned","2017-09-07T11:45:27Z"],["dc.date.available","2017-09-07T11:45:27Z"],["dc.date.issued","2014"],["dc.description.abstract","Objectives: Cardiovascular magnetic resonance feature tracking (CMR-FT) offers quantification of myocardial deformation from routine cine images. However, data using CMR-FT to quantify left ventricular (LV) torsion and diastolic recoil are not yet available. We therefore sought to evaluate the feasibility and reproducibility of CMR-FT to quantify LV torsion and peak recoil rate using an optimal anatomical approach. Methods: Short-axis cine stacks were acquired at rest and during dobutamine stimulation (10 and 20 mu g.kg(-1).min(-1)) in 10 healthy volunteers. Rotational displacement was analysed for all slices. A complete 3D-LV rotational model was developed using linear interpolation between adjacent slices. Torsion was defined as the difference between apical and basal rotation, divided by slice distance. Depending on the distance between the most apical (defined as 0% LV distance) and basal (defined as 100% LV distance) slices, four different models for the calculation of torsion were examined: Model-1 (25-75%), Model-2 (0-100%), Model-3 (25-100%) and Model-4 (0-75%). Analysis included subendocardial, subepicardial and global torsion and recoil rate (mean of subendocardial and subepicardial values). Results: Quantification of torsion and recoil rate was feasible in all subjects. There was no significant difference between the different models at rest. However, only Model-1 (25-75%) discriminated between rest and stress (Global Torsion: 2.7 +/- 1.5 degrees cm(-1), 3.6 +/- 2.0 degrees cm(-1), 5.1 +/- 2.2 degrees cm(-1), p<0.01; Global Recoil Rate: -30.1 +/- 11.1 degrees cm(-1) s (-1), -469 +/- 15.0 degrees cm (-1) s (-1), -68.9 +/- 32.3 degrees cm(-1) s(-1), p<0.01; for rest, 10 and 20 mu g.kg(-1).min(-1) of dobutamine, respectively). Reproducibility was sufficient for all parameters as determined by Bland-Altman analysis, intraclass correlation coefficients and coefficient of variation. Conclusions: CMR-FT based derivation of myocardial torsion and recoil rate is feasible and reproducible at rest and with dobutamine stress. Using an optimal anatomical approach measuring rotation at 25% and 75% apical and basal LV locations allows effective quantification of torsion and recoil dynamics. Application of these new measures of deformation by CMR-FT should next be explored in disease states."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2014"],["dc.identifier.doi","10.1371/journal.pone.0109164"],["dc.identifier.gro","3142035"],["dc.identifier.isi","000345743700050"],["dc.identifier.pmid","25285656"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10994"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/3823"],["dc.notes.intern","WoS Import 2017-03-10"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Public Library Science"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Quantification of Left Ventricular Torsion and Diastolic Recoil Using Cardiovascular Magnetic Resonance Myocardial Feature Tracking"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","670"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Heart Journal - Cardiovascular Imaging"],["dc.bibliographiccitation.lastpage","675"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Hoesch, Olga"],["dc.contributor.author","Thuy-Trang Ngyuen, Thuy-Trang Ngyuen"],["dc.contributor.author","Lauerer, Peter"],["dc.contributor.author","Schuster, Andreas"],["dc.contributor.author","Kutty, Shelby"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Paul, Thomas"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Steinmetz, Michael"],["dc.date.accessioned","2018-11-07T09:56:17Z"],["dc.date.available","2018-11-07T09:56:17Z"],["dc.date.issued","2015"],["dc.description.abstract","Aims Ebstein's anomaly (EA) involves a displaced and dysplastic tricuspid valve resulting in an atrialized portion of the right ventricle and an enlargement of the functional right ventricle and right atrium. Biomarkers targeting heart failure such as brain natriuretic peptide (BNP) or haematological parameters [haemoglobin (Hb) and haematocrit (Hct)] are upregulated in states of pulmonary hypoperfusion. We hypothesized that decreased pulmonary perfusion dependent on the stage of right heart failure is a possible mechanism in EA, and that it can be correlated with cardiac magnetic resonance (CMR) parameters. The aim of this study was to investigate the relationship between BNP and haematological parameters with functional parameters from CMR and exercise testing in patients with EA. Methods and results Twenty-five patients with non-corrected EA were studied prospectively (mean age 26 +/- 14 years). BNP level was increased (74 +/- 127 ng/L), and in 16% markedly above the heart failure cut-off level of 100 ng/L. Hb and Hct were increased above normal levels in 20 and 24% of patients, respectively. BNP and Hct/Hb correlated with CMR [total right/left (R/L)-Volume-Index, right atrium-end-diastolic volume index (EDVi), functional right ventricle (fRV)-EDVi, fRV-ejection fraction (EF), tricuspid regurgitation, pulmonary artery flow, and left ventricular EF] and exercise testing [workload/kg, oxygen uptake (VO2), ventilatory response to carbon dioxide production (VE/VCO2), oxygen (O-2) pulse, and heart rate reserve]. The higher BNP and haematological parameters, the higher was the disease severity and the more limited was the physical exercise capacity. Conclusion In this EA cohort, BNP levels and haematological parameters correlated well with functional data from CMR and exercise testing. The total R/L-Volume-Index and BNP, and to some extent hematological parameters, may be useful as prognostic markers in patients with EA."],["dc.description.sponsorship","Faculty of Medicine, Georg-August-University Gottingen, Germany"],["dc.identifier.doi","10.1093/ehjci/jeu312"],["dc.identifier.isi","000358014000013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36927"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Oxford Univ Press"],["dc.relation.issn","2047-2412"],["dc.relation.issn","2047-2404"],["dc.title","BNP and haematological parameters are markers of severity of Ebstein's anomaly: correlation with CMR and cardiopulmonary exercise testing"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","601"],["dc.bibliographiccitation.journal","SpringerPlus"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Schneider, Heike"],["dc.contributor.author","Fasshauer, Martin"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Kowallick, Johannes Tammo"],["dc.contributor.author","Schuster, Andreas"],["dc.contributor.author","Ritter, Christian"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.date.accessioned","2018-11-07T09:33:32Z"],["dc.date.available","2018-11-07T09:33:32Z"],["dc.date.issued","2014"],["dc.description.abstract","Introduction: Situs inversus totalis with congenitally corrected transposition of the great arteries represents a relatively rare congenital condition. Case description: The current report describes the case of a 56 year old patient with an atrio-ventricular and ventricular-arterial discordance of the heart chambers without surgical correction, incidentally detected during hepatocellular carcinoma evaluation. The systemic venous blood arrived via the right atrium and a mitral valve in the morphologically left but pulmonary arterial ventricle that gave rise to a pulmonary trunk. The pulmonary venous blood passed the left atrium and the tricuspid valve into a morphologically right but systemic ventricle that gave rise to the aorta. Discussion and evaluation: The switched anatomy was incidentally detected on echocardiography. The patient was referred to cardiac magnetic resonance imaging (CMR) including flow measurements, volumetry and late enhancement. CMR results showed a mildly impaired function and the switched anatomy. During a follow-up period of 2 years the patient was suffering from only mild heart failure and dyspnea. Conclusions: Heart failure symptoms and arrhythmias can appear with increasing age in patients with congenitally corrected transposition. Early CMR allows accurate diagnosis and timely introduction of adequate therapy thereby avoiding disease progression."],["dc.identifier.doi","10.1186/2193-1801-3-601"],["dc.identifier.isi","000359108200001"],["dc.identifier.pmid","25392774"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11150"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31986"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","2193-1801"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Situs inversus totalis with congenitally corrected transposition of the great arteries: insights from cardiac MRI"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","22"],["dc.bibliographiccitation.journal","Circulation"],["dc.bibliographiccitation.volume","128"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Schulte, Christina"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Kowallick, Johannes"],["dc.contributor.author","Preuss, Christoph"],["dc.contributor.author","Fasshauer, Martin"],["dc.contributor.author","Thuy-Trang Nguyen, Thuy-Trang Nguyen"],["dc.contributor.author","Paul, Thomas"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Steinmetz, Michael"],["dc.date.accessioned","2018-11-07T09:17:27Z"],["dc.date.available","2018-11-07T09:17:27Z"],["dc.date.issued","2013"],["dc.identifier.isi","000332162907028"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28173"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Lippincott Williams & Wilkins"],["dc.publisher.place","Philadelphia"],["dc.relation.conference","Scientific Sessions and Resuscitation Science Symposium of the American-Heart-Association"],["dc.relation.eventlocation","Dallas, TX"],["dc.relation.issn","1524-4539"],["dc.relation.issn","0009-7322"],["dc.title","Right Atrial Volume in Tetralogy of Fallot Correlates With the Incidence of Supra-Ventricular Arrhythmia: A MRI Study"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1239"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Pediatric Cardiology"],["dc.bibliographiccitation.lastpage","1247"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Rosenberg, Christina"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Schuster, Andreas"],["dc.contributor.author","Kowallick, Johannes Tammo"],["dc.contributor.author","Hoesch, Olga"],["dc.contributor.author","Thuy-Trang Nguyen, Thuy-Trang Nguyen"],["dc.contributor.author","Fasshauer, Martin"],["dc.contributor.author","Paul, Thomas"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Steinmetz, Michael"],["dc.date.accessioned","2018-11-07T09:54:12Z"],["dc.date.available","2018-11-07T09:54:12Z"],["dc.date.issued","2015"],["dc.description.abstract","The aim of this study was to evaluate right atrial (RA) volume in corrected Tetralogy of Fallot (cTOF) and assess its correlation with the occurrence of supraventricular (SV) arrhythmia. Cardiac magnetic resonance imaging (CMR) and 24-h Holter were performed in n = 67 consecutive cTOF patients (age 30 +/- A 11.3 years). The CMR protocol included standard HASTE, SSFP cine, and blood flow measurements. Correlations between arrhythmia in ECG, heart volume, and functional parameters were investigated by negative binominal regression. Patients' characteristics (mean +/- A SD) included mean RA volume of 49 +/- A 19 ml/m(2) (HASTE sequence), mean right ventricular (RV) end-diastolic volume of 98 +/- A 27 ml/m(2), mean pulmonary valve regurgitation fraction (PR) of 21 +/- A 19 %, BMI of 25 kg/m(2), and heart rate of 75/min. Twenty-eight out of 67 patients experienced SV arrhythmia including SV couplets or bigeminus or longer non-sustained SV tachycardia (SVT) episodes. RA volume index was identified as an independent risk factor for different degrees of SV arrhythmia (SV couplets/bigeminus p < 0.001, SVT p < 0.001). Further risk factors for SV arrhythmia were male gender (p = 0.023) and decreased left ventricular (LV) ejection fraction (EF) (LV EF p < 0.001). RA volume is increased in adult patients with cTOF with larger RA volumes relating to higher incidence of SV arrhythmia. SV arrhythmia also appeared more often in male patients and those with decreased LV EF. Risk stratification according to these parameters could help to optimize early prevention and adjusted individual therapy to improve patient outcome and quality of life."],["dc.description.sponsorship","DFG [LO 1773/1-1]"],["dc.identifier.doi","10.1007/s00246-015-1152-2"],["dc.identifier.isi","000357683800019"],["dc.identifier.pmid","25862665"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36485"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-1971"],["dc.relation.issn","0172-0643"],["dc.title","Right Atrial Volume is Increased in Corrected Tetralogy of Fallot and Correlates with the Incidence of Supraventricular Arrhythmia: A CMR Study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","989"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Clinical Radiology"],["dc.bibliographiccitation.lastpage","998"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Schuster, Andreas"],["dc.contributor.author","Stahnke, V. -C."],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Kowallick, Johannes Tammo"],["dc.contributor.author","Lamata, Pablo"],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Kutty, Shelby"],["dc.contributor.author","Faßhauer, M."],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Bigalke, Boris"],["dc.contributor.author","Ritter, Caroline"],["dc.contributor.author","Hasenfuß, Gerd"],["dc.contributor.author","Beerbaum, P."],["dc.contributor.author","Lotz, Joachim"],["dc.date.accessioned","2017-09-07T11:43:34Z"],["dc.date.available","2017-09-07T11:43:34Z"],["dc.date.issued","2015"],["dc.description.abstract","AIM: To assess intervendor agreement of cardiovascular magnetic resonance feature tracking (CMR-FT) and to study the impact of repeated measures on reproducibility. MATERIALS AND METHODS: Ten healthy volunteers underwent cine imaging in short-axis orientation at rest and with dobutamine stimulation (10 and 20 mu g/kg/min). All images were analysed three times using two types of software (TomTec, Unterschleissheim, Germany and Circle, cvi(42), Calgary, Canada) to assess global left ventricular circumferential (Ecc) and radial (Err) strains and torsion. Differences in intra-and interobserver variability within and between software types were assessed based on single and averaged measurements (two and three repetitions with subsequent averaging of results, respectively) as determined by Bland-Altman analysis, intraclass correlation coefficients (ICC), and coefficient of variation (CoV). RESULTS: Myocardial strains and torsion significantly increased on dobutamine stimulation with both types of software (p<0.05). Resting Ecc and torsion as well as Ecc values during dobutamine stimulation were lower measured with Circle (p<0.05). Intra-and interobserver variability between software types was lowest for Ecc (ICC 0.81 [0.63-0.91], 0.87 [0.72-0.94] and CoV 12.47% and 14.3%, respectively) irrespective of the number of analysis repetitions. Err and torsion showed higher variability that markedly improved for torsion with repeated analyses and to a lesser extent for Err. On an intravendor level TomTec showed better reproducibility for Ecc and torsion and Circle for Err. CONCLUSIONS: CMR-FT strain and torsion measurements are subject to considerable intervendor variability, which can be reduced using three analysis repetitions. For both vendors, Ecc qualifies as the most robust parameter with the best agreement, albeit lower Ecc values obtained using Circle, and warrants further investigation of incremental clinical merit. (C) 2015 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.crad.2015.05.006"],["dc.identifier.gro","3141835"],["dc.identifier.isi","000361899600012"],["dc.identifier.pmid","26139384"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/1601"],["dc.notes.intern","WoS Import 2017-03-10"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.eissn","1365-229X"],["dc.relation.issn","0009-9260"],["dc.title","Cardiovascular magnetic resonance feature-tracking assessment of myocardial mechanics: Intervendor agreement and considerations regarding reproducibility"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","60"],["dc.bibliographiccitation.journal","Journal of Cardiovascular Magnetic Resonance"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Kowallick, Johannes Tammo"],["dc.contributor.author","Kutty, Shelby"],["dc.contributor.author","Edelmann, Frank"],["dc.contributor.author","Chiribiri, Amedeo"],["dc.contributor.author","Villa, Adriana"],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Bettencourt, Nuno"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Hasenfuß, Gerd"],["dc.contributor.author","Lotz, Joachim"],["dc.contributor.author","Schuster, Andreas"],["dc.date.accessioned","2017-09-07T11:45:39Z"],["dc.date.available","2017-09-07T11:45:39Z"],["dc.date.issued","2014"],["dc.description.abstract","Background: Cardiovascular Magnetic Resonance myocardial feature tracking (CMR-FT) is a quantitative technique tracking tissue voxel motion on standard steady-state free precession (SSFP) cine images to assess ventricular myocardial deformation. The importance of left atrial (LA) deformation assessment is increasingly recognized and can be assessed with echocardiographic speckle tracking. However atrial deformation quantification has never previously been demonstrated with CMR. We sought to determine the feasibility and reproducibility of CMR-FT for quantitative derivation of LA strain and strain rate (SR) myocardial mechanics. Methods: 10 healthy volunteers, 10 patients with hypertrophic cardiomyopathy (HCM) and 10 patients with heart failure and preserved ejection fraction (HFpEF) were studied at 1.5 Tesla. LA longitudinal strain and SR parameters were derived from SSFP cine images using dedicated CMR-FT software (2D CPA MR, TomTec, Germany). LA performance was analyzed using 4- and 2-chamber views including LA reservoir function (total strain [epsilon(s)], peak positive SR [SRs]), LA conduit function (passive strain [epsilon(e)], peak early negative SR [SRe]) and LA booster pump function (active strain [epsilon(a)], late peak negative SR [SRa]). Results: In all subjects LA strain and SR parameters could be derived from SSFP images. There was impaired LA reservoir function in HCM and HFpEF (epsilon(s) [%]: HCM 22.1 +/- 5.5, HFpEF 16.3 +/- 5.8, Controls 29.1 +/- 5.3, p < 0.01; SRs [s(-1)]: HCM 0.9 +/- 0.2, HFpEF 0.8 +/- 0.3, Controls 1.1 +/- 0.2, p < 0.05) and impaired LA conduit function as compared to healthy controls (epsilon(e) [%]: HCM 10.4 +/- 3.9, HFpEF 11.9 +/- 4.0, Controls 21.3 +/- 5.1, p < 0.001; SRe [s(-1)]: HCM -0.5 +/- 0.2, HFpEF -0.6 +/- 0.1, Controls -1.0 +/- 0.3, p < 0.01). LA booster pump function was increased in HCM while decreased in HFpEF (epsilon(a) [%]: HCM 11.7 +/- 4.0, HFpEF 4.5 +/- 2.9, Controls 7.8 +/- 2.5, p < 0.01; SRa [s(-1)]: HCM -1.2 +/- 0.4, HFpEF -0.5 +/- 0.2, Controls -0.9 +/- 0.3, p < 0.01). Observer variability was excellent for all strain and SR parameters on an intra- and inter-observer level as determined by Bland-Altman, coefficient of variation and intraclass correlation coefficient analyses. Conclusions: CMR-FT based atrial performance analysis reliably quantifies LA longitudinal strain and SR from standard SSFP cine images and discriminates between patients with impaired left ventricular relaxation and healthy controls. CMR-FT derived atrial deformation quantification seems a promising novel approach for the study of atrial performance and physiology in health and disease states."],["dc.identifier.doi","10.1186/s12968-014-0060-6"],["dc.identifier.gro","3142077"],["dc.identifier.isi","000341846700001"],["dc.identifier.pmid","25196447"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10814"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4289"],["dc.notes.intern","WoS Import 2017-03-10"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Biomed Central Ltd"],["dc.relation.eissn","1532-429X"],["dc.relation.issn","1097-6647"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Quantification of left atrial strain and strain rate using Cardiovascular Magnetic Resonance myocardial feature tracking: a feasibility study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","S1"],["dc.bibliographiccitation.journal","Journal of Cardiovascular Magnetic Resonance"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Sohns, Jan Martin"],["dc.contributor.author","Unterberg-Buchwald, Christina"],["dc.contributor.author","Kowallick, Johannes Tammo"],["dc.contributor.author","Steinmetz, Michael"],["dc.contributor.author","Schulte, Christina"],["dc.contributor.author","Staab, Wieland"],["dc.contributor.author","Joseph, Arun A."],["dc.contributor.author","Merboldt, Klaus-Dietmar"],["dc.contributor.author","Voit, Dirk"],["dc.contributor.author","Zhang, Shuo"],["dc.contributor.author","Uecker, Martin"],["dc.contributor.author","Frahm, Jens"],["dc.contributor.author","Lotz, Joachim"],["dc.date.accessioned","2020-05-13T13:46:13Z"],["dc.date.available","2020-05-13T13:46:13Z"],["dc.date.issued","2013"],["dc.description.abstract","Background A high resolution real-time phase-contrast MRI flow technique was used to measure flow dynamics in the ascending aorta as well as superior vena cava. MRI technique based on undersampled radial fast low-angle shot acquisitions with phase-sensitive image reconstructions by regularized nonlinear inversion. Normal flow values as well as flow measurements during physiologic stress tests like Valsalva (increased intrathoracic pressure) and Mueller (decreased intrathoracic pressure, reverse of Valsalva maneuver) were obtained in healthy volunteers. Methods Blood flow was measured in the ascending aorta and superior vena cava using a single scan plane perpendicular to the ascending aorta at the level of the right pulmonary artery. In-plane resolution of 1.8 mm, section thickness of 6 mm at a real-time resolution of 48 ms was achieved by TR 3.44 ms; TE 2.76 ms; flip angle, 10 degrees and seven radial spokes per image. Scans were done in a clinical 3T scanner. ECG was co-registered for documentation only. Realtime scans were done for 20 seconds in normal measurements, 30 seconds for physiologic and stress maneuvers - 10 seconds normal breathing, 10 seconds applied stress, 10 seconds recovery time. Image analysis was done using a specifically modified prototype software Qflow by Medis, NL. Results Realtime measurements were successful in all cases. We observed a decrease of blood-flow during Valsalva and Mueller maneuver in the ascending aorta. At the beginning of the maneuver, the blood flow increased under both increased and reduced intrathoracic pressure, followed by a continuous period of nearly 20 sec of decreased flow. A reactive hyperdynamic flow response was detected after restarting regular breathing. Conclusions High resolution real-time MRI flow measurements are able to resolve detailed physiological blood flow changes during Vasalva and Mueller maneuvers with high reliability. The results are in consistence with published echocardiography studies on Valsalva and Mueller maneuvers. Free breathing and patient's movement did not disturb the scan and image quality with this new technique. This technique might provide new insights into pathophysiologic changes associated for example with preclinical congestive heart failure."],["dc.identifier.doi","10.1186/1532-429X-15-S1-E17"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65378"],["dc.language.iso","en"],["dc.relation.issn","1532-429X"],["dc.title","Real-time cardiac phase contrast MRI blood flow including Valsalva and Mueller maneuver. Initial experiences"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]