bluuebunny/crossref_metadata_2025_split huggingface dataset:
Katheterablation ventrikulärer Tachykardien – eher früher als später?
Authors: Maagh Petra , Perings Christian , Strickling Niklas 
Published: June 2023

Zusammenfassung
Hintergrund Die Katheterablation von ventrikulären Tachykardien (VT) auf dem Boden einer strukturellen Herzerkrankung ist wirksam in der Behandlung von VT-Rezidiven und Therapien
mit implantierbarem Kardioverter-Defibrillator (ICD). Patienten werden trotzdem häufig relativ spät in ihrem klinischen Verlauf zur Katheterablation vorgestellt.
Ziel der Arbeit Die Fragestellung bezieht sich auf den idealen Zeitpunkt einer Katheterablation, der bis heute Gegenstand intensiver Diskussionen ist.
Material und Methode Nach Veröffentlichung der Leitlinien zum Management von Patienten mit ventrikulären Arrhythmien und zur Prävention des plötzlichen Herztods wurden 3
multizentrische randomisierte kontrollierte Studien veröffentlicht (PARTITA, PAUSE SCD und SURVIVE VT), die den optimalen Zeitpunkt der Katheterablation von VT zu finden versuchen.
Ergebnisse PARTITA, PAUSE SCD und SURVIVE VT konnten den Nachweis erbringen, dass eine frühe VT-Ablation, d. h. nach dem ersten Auftreten einer VT-Episode, nicht nur zu einer
Verringerung der ICD-Therapien mit einem Trend zur Verringerung der Krankenhauseinweisungen wegen Arrhythmierezidiven und Verschlechterung der Herzinsuffizienz führen kann, sondern auch
einen Mortalitätsvorteil liefern kann (PARTITA).
Schlussfolgerungen In Kenntnis der aktuellen Studienlage sollte die frühe Einleitung einer Katheterablation bei Patienten mit struktureller Herzerkrankung frühestens nach dem
ersten Auftreten einer VT-Episode erwogen werden, um positive Effekte nicht zu verpassen. Größere Studien sind erforderlich, um das Risiko/den Nutzen einer Erstlinienablation und seinen
optimalen Zeitpunkt zu bestimmen.
Differenzialtherapie ventrikulärer Tachykardien – Was ist relevant
für die Praxis?
Authors: Reinhardt Adrian , Ventura Rodolfo , Jansen Henning , Lemeš Christine , Veltmann Christian 
Published: June 2023

ZusammenfassungDie Diagnose ventrikulärer Tachykardien (VT) erfolgt elektrokardiografisch
mittels 12-Kanal-Elektrokardiogramm. Sie stellt jedoch gerade in der
Abgrenzung zu aberrant übergeleiteten supraventrikulären Tachykardien (SVT)
im Hinblick auf die Akuttherapie auch für erfahrene Kardiologen nicht selten
eine Herausforderung dar. Daher wurden diagnostische Algorithmen zur
Diskriminierung von SVT von VT entwickelt. Das Management einer
ventrikulären Tachykardie umfasst neben der Terminierung der Rhythmusstörung
die Ursachenklärung und die Stratifizierung im Hinblick auf das Risiko eines
plötzlichen Herztods. Für die Akuttherapie stehen medikamentöse Optionen und
interventionelle Verfahren wie die Katheterablation zur Verfügung.Der vorliegende Artikel gibt einen Überblick über die verschiedenen
therapeutischen Ansätze zur Akutbehandlung der ventrikulären Tachykardien in
Abhängigkeit der zugrunde liegenden Ursachen.
Validity of Weekly and Monthly Perceived Exertion in
Runners
Authors: Arantes Bertochi Gabriel Felipe , Mota Gustavo R , Haile Luke , Marocolo Moacir , Eidi Sasaki Jeffer 
Published: June 2023

AbstractThe development of the rating of perceived exertion (RPE) enables the easy
assessment of runners’ training strain as well as training load (TL).
However, the long-term and retrospective validity of TL assessment using RPE
scales still needs further investigation. Therefore, this study examined the
validity of weekly and monthly ratings of perceived exertion (W-RPE, M-RPE) in
assessing TL in runners. Healthy adult runners (n=53) rated perceived
exertion using the modified category-ratio 10 (CR-10) scale for each week of a
four-week period, as well as for the month, considering the four-week period.
CR-10 for the week and the month were multiplied by the total training time of
the week and month, respectively, to assess the W-RPE and M-RPE. Training
impulse (TRIMP) was used as the criterion measure. The results indicated that
the W-RPE and M-RPE may be used for monitoring TL during prolonged periods,
presenting a very large correlations with the criterion measure.
Synthesis and Evaluation of Saponins with All-Nitrogenated Sugars
Authors: Okamura Toshitaka , Sato Takaaki , Kage Ayaha , Okuyama Yuya , Kato Erina , Matagawa Tomoe , Kawano Sayaka , Simizu Siro , Chida Noritaka 
Published: June 2023

AbstractSaponins exhibit multiple biological and pharmacological activities, and the sugar moiety of saponins is known to play a crucial role in bioactivity. In this report, we focus on the synthesis and evaluation of saponins with all-nitrogenated sugar (ANS), in which all oxygen atoms are replaced with nitrogen atoms. OSW-1 derivative-, cholesterol-, and diosgenin-ANS glycosides are synthesized by glycosylation with ANS in the presence of TMSOTf. As a result, the OSW-1 mimic, with ANS, exhibits good cytotoxic activity (IC50 = 7.31 μM) and induces apoptosis.
Transition-Metal-Free Insertion of Diazo Compounds, N-Arylsulfonylhydrazones or Ylides into Organoboronic Acids or Their Derivatives
Authors: Wang Jianbo , Bao Zhicheng 
Published: June 2023

AbstractInsertion reactions of carbenes or ylides with organoboronic acids or their derivatives have emerged as valuable methods for coupling or homologation of organoboron compounds under metal-free conditions. The crucial steps of these reactions are coordination of the electron-rich carbon centers of the carbene precursors or ylides to the electron-poor boron center, followed by 1,2-migration of the corresponding tetracoordinated boron intermediates. This type of unique transformation provides an efficient method for the construction of C–C or C–X (X = H, B) bonds. Moreover, the C–B bonds generated by such transformations can be utilized as a handle for further derivatization or iterative homologations. In this Account, we summarize the developments in this arena according to the reactive diazo compound, N-arylsulfonylhydrazone or ylide species involved.1 Introduction2 Reactions with Diazo Compounds3 Reactions with N-Arylsulfonylhydrazones4 Reactions with Ylides5 Conclusion
The Impact of the SARS-CoV-2 Pandemic on Stress and Anxiety of Dental Students
Authors: Zenthöfer Andreas , Graf Andreas , Rammelsberg Peter , Klotz Anna-Luisa 
Published: June 2023

Abstract
Objectives To investigate the impact of the severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) pandemic on stress and anxiety of preclinical and clinical dental students.
Materials and Methods Dental students (participants) in their clinical course (CC; n = 64) or preclinical course (PCC; n = 53) were included in the study. The subjective perceived levels of stress and anxiety were evaluated using the Dental Environment Stress (DES) questionnaire and the Depression, Anxiety and Stress Scales (DASS) questionnaire. Cortisol levels were measured in saliva samples collected from participants. Knowledge of the pandemic was evaluated using a 100-mm visual analog scale. All data were collected twice: once during the university holidays and once during term time.
Statistical Analysis Results from DES, DASS, and salivary cortisol tests were compared between baseline and follow-up using descriptive and bivariate statistics. Multivariate linear regression models were computed with DES, DASS, and cortisol values as dependent variables to analyze possible influencing factors.
Results Participants showed medium levels of stress and anxiety at baseline and follow-up. The DASS score in the “anxiety” subdomain was significantly higher in the PCC group than in the CC group at baseline (p < 0.001) and increased during term time. DASS scores in the “stress” subdomain also increased during term time. However, both subdomain scores were lower than the cutoff value for a psychological disorder. The mean total DES scores were 615.9 ± 97.7 in the CC group and 580.40 ± 98.9 in the PCC group. These scores indicated medium stress levels and were not significantly different between the groups, nor did they change during the study period. Mean saliva cortisol levels were higher in the CC group (9.2 ± 5.2) than in the PCC group (4.9 ± 2.2) at baseline (p < 0.001) but converged by follow-up. Multivariate regression models showed that intraindividual perception of stress at baseline was consistently the most important aspect for changes in stress and anxiety levels during term time. The SARS-CoV-2 pandemic affected stress and anxiety levels in some participants, but this was not ubiquitous.
Conclusion Intraindividual differences in stress perception seem to be more relevant than course affiliation (preclinical or clinical) or the SARS-CoV-2 pandemic to stress and anxiety levels in dental students.
Spinal Subdural Hematoma following Epidural Anesthesia
Authors: Bhosle Rajesh , Raju Dimble , Patel Shamshuddin Senior , Aditya Grandhi , Shukla Jagriti , Ghosh Nabanita , Krishnan Prasad 
Published: June 2023

AbstractThe spinal subdural space is an avascular, potential space and is a rare location for intraspinal hematomas. Compared to spinal epidural hematomas, spinal subdural hematomas are uncommonly described complications of lumbar puncture for spinal or epidural anesthesia, particularly in patients who have no pre-existing bleeding disorders or history of antiplatelet or anticoagulant intake. We describe a 19-year-old girl who had a large thoracolumbar spinal subdural hematoma following epidural anesthesia for elective cholecystectomy with no pre-existing bleeding diathesis that caused rapidly developing paraplegia that evolved over the next 2 days following surgery. Nine days after the initial surgery she underwent multilevel laminectomy and surgical evacuation with eventual satisfactory recovery. Even epidural anesthesia without thecal sac violation can result in bleeding in the spinal subdural space. The possible sources of bleed in this space may be from injury to an interdural vein or extravasation of subarachnoid bleed into the subdural space. When neurological deficits occur, prompt imaging is mandatory and early evacuation yields gratifying results.
Influence of Preoperative Sagittal Alignment on Functional Recovery in Operated Cases of Cervical Spondylotic Myelopathy
Authors: Acharya Shankar , Khanna Varun , Kalra Kashmiri Lal , Chahal Rupinder Singh 
Published: June 2023

Abstract
Objective We examine the influence of preoperative cervical sagittal curvature (lordotic or nonlordotic) on the functional recovery of surgically managed cases of cervical spondylotic myelopathy (CSM). The impact of sagittal alignment on the functional improvement of operated CSM cases has not been thoroughly investigated.
Materials and Methods We did retrospective analysis of consecutively operated cases of CSM from March 2019 to April 2021. Patients were grouped into two categories: lordotic curvature (with Cobb angle > 10 degrees) and nonlordotic curvature (including neutral [Cobb angle 0–10 degrees] and kyphotic [Cobb angle < 0 degrees]). Demographic data, and preoperative and postoperative functional outcome scores (modified Japanese Orthopaedic Association [mJOA] and Nurick grade) were analyzed for dependency on preoperative curvature, and correlations between outcomes and sagittal parameters were assessed.
Results In the analysis of 124 cases, 63.1% (78 cases) were lordotic (mean Cobb angle of 23.57 ± 9.1 degrees; 11–50 degrees) and 36.9% (46 cases) were nonlordotic (mean Cobb angle of 0.89 ± 6.5 degrees; –11 to 10 degrees), 32 cases (24.6%) had neutral alignment, and 14 cases (12.3%) had kyphotic alignment. At the final follow-up, the mean change in mJOA score, Nurick grade, and functional recovery rate (mJOArr) were not significantly different between the lordotic and nonlordotic group. In the nonlordotic group, cases with anterior surgery had a significantly better mJOArr than those with posterior surgery (p = 0.04), whereas there was similar improvement with either approach in lordotic cases. In the nonlordotic group, patients who gained lordosis (78.1%) had better recovery rates than those who had lost lordosis (21.9%). However, this difference was not statistically significant.
Conclusion We report noninferiority of the functional outcome in the cases with preoperative nonlordotic alignment when compared with those with lordotic alignment. Further, nonlordotic patients who were approached anteriorly fared better than those approached posteriorly. Although increasing sagittal imbalance in nonlordotic spines portend toward higher preoperative disability, gain in lordosis in such cases may improve results. We recommend further studies with larger nonlordotic subjects to elucidate the impact of sagittal alignment on functional outcome.
Evaluation of Low-Frequency Noise, Infrasound, and Health Symptoms at an Administrative Building and Men's Shelter: A Case Study
Authors: Chiu Sophia K. , Brueck Scott E. , Wiegand Douglas M. , Free Hannah L. , Echt Hannah 
Published: June 2023

AbstractResponses to complaints about low-frequency noise and infrasound at workplaces have not been extensively documented in the literature. The National Institute for Occupational Safety and Health evaluated low-frequency noise, infrasound, and health symptoms among employees of an organization providing services to homeless persons. The organization's campus was evacuated after two loud noise and vibration incidents related to methane flare on an adjacent landfill. Employees were interviewed about health symptoms, perceptions of noise, and how the incidents were handled. Available medical records were reviewed. Sound level and noise frequency measurements taken in vacated campus buildings not during these incidents revealed overall levels across frequencies up to 100 hertz were 64 to 73 dB, well below those associated with adverse health effects. However, an unbalanced frequency spectrum could have contributed to the unusual sounds or vibrations reported before the first incident. Some symptoms predating the incidents are consistent with low-frequency noise exposure but are also common and nonspecific. Most interviewed employees (57%) reported being uncomfortable returning to work on the campus. Multiple factors such as noise characteristics, health effects, and employee perceptions need to be considered when assessing health concerns related to low-frequency noise and infrasound.
How online discourse networks fields of practice: The discursive negotiation of autonomy on art organisation about pages
Authors: Soro Tommie 
Published: June 2023

AbstractThis article examines how the online discourse of art organisations forges relationships between the artworld and the fields of politics and economy. Combining elements of Pierre Bourdieu’s field analysis and Norman Fairclough’s critical discourse analysis, the article analyses an elite art magazine, e-flux, and an elite art museum, IMMA, and the activities of discourses, genres, and utterances on their about pages. Its results suggest that the about pages of these organisations forge links between the artworld and the fields of politics and economy by mobilising discourse in these fields and by incorporating discourse practices from these fields. The ideological tension resulting from this interdiscursivity was found to be managed in different ways. The article thereby contributes to furthering our understanding of how discourse networks fields of practice.
Optimization of a fast deuterium diagnostic method based on visible energetic 3He spectroscopy for high electron density plasmas
Authors: Kimura K. , Matsuura H. , Itoh C. , Kawamoto Y. , Oishi T. , Goto M. , Ogawa K. , Nishitani T. , Isobe M. , Osakabe M. 
Published: June 2023

Fast ions play a crucial role in plasma heating, and their behavior in the plasma must be accurately understood. A diagnostics method based on charge exchange emission from the n = 4 − 3 transition (λ0 = 468.6 nm) of energetic 3He produced by the deuteron–deuteron reaction has been proposed as a for fast deuterons with energies in the order of MeV. The proposed method has the following advantages: No beam emission interferes with the spectra, the direction of the measuring line of sight, and the injection angle of the diagnostic beam can be freely determined. In previous studies, due to competing bremsstrahlung, it was expected that the proposed method will not be practical in the case of high electron density operation. This paper makes the proposed method available for measurement even at high electron densities by optimizing the measurement line of sight direction and the diagnostic beam incidence angle. This allows an electron density five times larger than the range of applications shown in previous studies. This result will contribute to measure of DT alpha in ITER.
Sputter sample preparation for ion beam delivery of radium-223 at ATLAS
Authors: McLain J. , Gott M. , Greene J. , Scott R. , Vondrasek R. 
Published: June 2023

A radium-223 ion beam was delivered to an experiment from the electron cyclotron resonance ion source, ECR2, at the Argonne Tandem Linac Accelerator System (ATLAS). The radium-223 material was in a nitrate salt form within a vial, prior to being converted to a usable sputter sample. The sputter sample was produced using a new sample preparation method, where the radium nitrate was dissolved into a solution and pipetted onto pressed aluminum powder. This sample was then allowed to dry, distributing the radium-223 material throughout the sputter sample. Ion source operation using the radium sputter sample is described with the operating parameters listed. The intensity and energy requirements for this ion beam were 1 × 106 particles/s and 1.07 GeV, respectively. Because the intensity is relatively low compared to most experiments at ATLAS, previously developed accelerator mass spectrometry methods were used Scott et al. [Rev. Sci. Instrum. 87, 02A732 (2016)] to avoid the need for tuning of the low-intensity beam of interest. Handling of the radium material, as well as loading and unloading of the sputter sample from ECR2, required collaboration with Health Physics. Procedures were used and dry runs were carried out before, during, and after the experiment to ensure the safety of the workers. The processes used and lessons learned are described within.
A 20 A bipolar current source with 140 μA noise over 100 kHz bandwidth
Authors: Zhao M. , Restelli A. , Tao J. , Liang Q. , Spielman I. B. 
Published: June 2023

The precise control of direct current (dc) magnetic fields is crucial in a wide range of experimental platforms, from ultracold quantum gases and nuclear magnetic resonance to precision measurements. In each of these cases, the Zeeman effect causes quantum states to shift in energy as a function of the magnetic field. The development of low-noise current sources is essential because electromagnets are the preferred tool to dynamically control the magnetic field. Here, we describe an ultra-low noise bipolar current source using pairs of complementary n- and p-channel metal–oxide–semiconductor field-effect transistors controlled by zero-drift operational amplifiers. Our source has a 90 kHz inherent bandwidth and provides current from −20 to 20 A with noise (0.1 Hz to 100 kHz) of 140 µA at ±20 A.
A new J.E probe for measurement of spatial profiles of power absorption in RF produced plasma
Authors: Rawat Arti , Ganguli A. , Narayanan Ramesh , Tarey R. D. 
Published: June 2023

This paper reports an indigenously developed probe for the measurement of spatial profiles of the absorbed/generated RF power density Pabs (W/m3) in RF discharges. The technique utilizes a calibrated current (J) probe based on the Rogowski coil principle and an electric field (E) probe based on capacitive coupling, both integrated into a single probe called the J.E probe. Various aspects of the probe, such as its design, fabrication, calibration, and limitations, were resolved before it was used for obtaining axial profiles of RF power absorption/generation. Also presented are the first experimental results for the absorbed power density profiles at the fundamental (13.56 MHz) and harmonic (27.12 MHz) along the length of a capacitively coupled discharge. The axial scans between the powered and grounded electrode were taken at different argon gas pressures (10–800 mTorr) at a fixed RF power of 10 W. Detailed analysis of the results shows that even for systems with large electrode gaps, i.e., plasmas with long bulk plasma regions, practically all the fundamental power is absorbed in a narrow edge region near the powered electrode, irrespective of the pressure. Absorption is high near the RF electrode since the RF fields peak in this region. Another important conclusion is that stochastic absorption of the fundamental and harmonic generation proceeds fairly efficiently in the vicinity of the powered electrode even at high pressures. It may be mentioned that the probe technique introduced here is the first of its kind, and although there is considerable scope for miniaturization, it has, nonetheless, provided some key insights into the nature of RF power absorption in capacitive discharges.
Electric double layer contribution to sum frequency generation signal from Au electrode
Authors: Song Qian-Tong , Huang-Fu Zhi-Chao , Liu XiaoLin , Wang Yue , He YuHan , Yu ZhiYuan , Wang ChangYi , Sun Shi-Gang , Wang ZhaoHui 
Published: June 2023

Understanding the electric double layer (EDL) of the metal electrode–electrolyte interface is essential to electrochemistry and relevant disciplines. In this study, potential-dependent electrode Sum Frequency Generation (SFG) intensities of polycrystalline gold electrodes in HClO4 and H2SO4 electrolytes were thoroughly analyzed. The potential of zero charges (PZC) of the electrodes was −0.06 and 0.38 V in HClO4 and H2SO4, respectively, determined from differential capacity curves. Without specific adsorption, the total SFG intensity was dominated by the contribution from the Au surface and increased similar to that of the visible (VIS) wavelength scanning, which pushed the SFG process closer to the double resonant condition in HClO4. However, the EDL contributed about 30% SFG signal with specific adsorption in H2SO4. Below PZC, the total SFG intensity was dominated by the Au surface contribution and increased with potential at a similar slope in these two electrolytes. Around PZC, as the EDL structure became less ordered and the electric field changed direction, there would be no EDL SFG contribution. Above PZC, the total SFG intensity increased much more rapidly with potential in H2SO4 than in HClO4, which suggested that the EDL SFG contribution kept increasing with more specific adsorbed surface ions from H2SO4.
Effect of Nd doping on the crystallographic, magnetic, and magnetocaloric properties of NdxGd3−xCoNi
Authors: Oleaga A. , Erkoreka A. , Herrero A. , Provino A. , Peddis D. , Manfrinetti P. 
Published: June 2023

The crystal structure, magnetic and magnetocaloric properties, and the critical behavior of representative compounds in the pseudo-ternary NdxGd3−xCoNi series have been investigated (x = 0.15, 0.5, 1.0, and 1.5). All these phases are isotypic with the parent compound Gd3CoNi, crystallizing with the monoclinic Dy3Ni2-type (mS20, C2/m, No. 12). All samples present a paramagnetic to ferromagnetic (PM-FM) second order phase transition with decreasing Curie temperature as the Nd concentration is increased (TC = 171, 150, 120, and 96 K, respectively) and, at lower temperatures, there is a spin reorientation, which leads to a complex magnetic ground state. The critical exponents (β, γ, and δ) have been retrieved for the PM-FM transitions. On the one hand, in x = 0.15, 0.5, and 1.5 the value of γ ≈ 1 indicates that the magnetic interactions are long-range order while the values of β point to a certain deviation from the 3D-Heisenberg universality class; on the other hand, NdGd2CoNi has a particular critical behavior, as β is close to the mean field model while γ is close to the uniaxial 3D-Ising one. Concerning the magnetocaloric properties, the magnetic entropy change and refrigerant capacity present competitive values, interesting for cryogenic applications. Finally, the thermal diffusivity values of these compounds are extremely good for practical magnetocaloric refrigeration systems, as they are in the range 1.5–3 mm2/s.