14 results on '"C. Kriegler"'
Search Results
2. Cancer Careers a ROECSGXLearnOncology podcast: Increasing Accessibility to Information about Oncology Careers
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L Linkowski, K Banson, K Corrigan, C Kriegler, C Lim, JR Gunther, S Braunstein, and PA Ingledew
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Cancer Research ,Radiation ,Oncology ,Radiology, Nuclear Medicine and imaging - Published
- 2022
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3. Cost Minimization Analysis of Conventional vs. Short-Course Radiotherapy with Temozolomide for Non-Elderly Patients with Newly Diagnosed Glioblastoma
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J. Hill, S.I. Patel, Y.M. Zhu, T.M. Steed, M. Al Balushi, C. Kriegler, Y. Nijjar, and E. Spackman
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Cancer Research ,Radiation ,Oncology ,Radiology, Nuclear Medicine and imaging - Published
- 2022
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4. Feasibility of Using Intracardiac Impedance Measurements for Capture Detection
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Eckhard Alt, M. Heinz, David L. Hayes, W. Combs, Richard Willhaus, Parwis Fotuhi, and C. Kriegler
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Pacemaker, Artificial ,business.industry ,Cardiac Pacing, Artificial ,Equipment Design ,General Medicine ,Energy consumption ,Sensitivity and Specificity ,Intracardiac injection ,Clinical Practice ,Electrocardiography ,Electric Impedance ,Feasibility Studies ,Humans ,Telemetry ,Medicine ,Cardiology and Cardiovascular Medicine ,Programmer ,High-pass filter ,business ,Electrical impedance ,Algorithms ,Pulse-width modulation ,Simulation ,Telemeter - Abstract
Energy consumption and longevity of modern pacemakers are determined by the controlling electronic circuitry and by the stimulation energy. While with technological progress the electronics' energy consumption has been reduced significantly, clinical practice shows that many cardiac pacemakers are programmed to suboptimal settings with regard to minimization of pacing energy consumption. Several methods for optimizing pacemaker output settings have been proposed in the past. The most promising concept is an output parameter optimizing pacemaker with automatic capture detection. We examined whether it is possible to distinguish between effective and ineffective pacemaker stimulus capture by analyzing high pass filtered intracardiac impedance signals that are derived from standard bipolar pacing leads. In one series of 11 patients undergoing replacement or implantation of chronic bipolar pacemakers, four patients during electrophysiology studies, and eight volunteers undergoing invasive electrophysiology trials, we examined intracardiac impedance signals obtained with various stimulation rates and output parameter settings. Additionally we analyzed a series of five patients with implanted pacemakers that can measure and telemeter intracardiac impedance signals. Several evaluation concepts have been analyzed regarding their ability to discriminate between effective and ineffective stimuli. We developed an adequate algorithm that detects capture or loss of capture at different output parameter settings based on intracardiac impedance analysis. The sensitivity is 98.5% and specificity is 91% to loss of capture for the currently investigated algorithm and this can be used to determine the optimal setting of pulse width and amplitude with regard to energy consumption. This concept is currently under realization in the external programmer and in the future an implementation of these algorithms within the pacemaker itself is intended.
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- 1992
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5. Computerized tomographic evaluation of acute distal radial fractures
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Johann C. Kriegler, Geoffrey Johnston, and Lawrence Friedman
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,Radiography ,Radial fractures ,X ray computed ,Humans ,Medicine ,Orthopedics and Sports Medicine ,Prospective Studies ,Fractures, Closed ,Carpal Bones ,business.industry ,Middle Aged ,Wrist Injuries ,Surgery ,Patient management ,Radius ,medicine.anatomical_structure ,Acute Disease ,Upper limb ,Female ,Tomography ,Radiology ,Radius Fractures ,Tomography, X-Ray Computed ,business - Abstract
To learn whether computerized tomography offered additional useful information over conventional radiographic evaluation of acute distal radial fractures in the younger adult, we scanned 22 consecutive injured wrists. Of the distal radial fractures in 19 wrists, sixteen were defined on plain films as intra-articular. In contrast, computerized tomography demonstrated that all fractures of the distal radius had intra-articular extension. In 3 wrists interpreted as being normal on plain films, despite clinical suspicion of a fracture, fractures were confirmed by computerized tomography. As a result of computerized tomography, injuries were assigned a higher Frykman value in 5 cases, and consideration of alternative patient management became necessary in 5 of the 22 patients.
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- 1992
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6. A Morphological Method For Separation Of Ventricular Tachycardia From Ventricular Fibrillation On Intracardiac Electrograms
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C. Kriegler, Lorenzo A. DiCarlo, and Janice M. Jenkins
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Fibrillation ,medicine.medical_specialty ,Medical treatment ,business.industry ,medicine.disease ,Ventricular tachycardia ,Internal medicine ,Anesthesia ,Ventricular fibrillation ,cardiovascular system ,medicine ,Cardiology ,cardiovascular diseases ,medicine.symptom ,business ,Intracardiac Electrogram - Abstract
A method for the separation of ventricular tachycardia (VT) and ventricular fibrillation (VF) from intracardiac electrograms has been designed and tested on rewrdinge from 18 patients. The magnitude of the Variance (2) of the correlation eaficient wmputed for each depolarization was found to euceessfully discriminate VT from VF in 11/18 wes.
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- 2005
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7. Spectral multiplier theorems via $H^\infty$ calculus and $R$-bounds
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Kriegler, Christoph, Weis, Lutz, Laboratoire de Mathématiques Blaise Pascal (LMBP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Fakultät für Mathematik, KIT, Allemagne, Institut für Algebra und Geometrie / Institute for Algebra and Geometry, Karlsruhe Institute of Technology (KIT)-Karlsruhe Institute of Technology (KIT), and C. Kriegler acknowledges financial support from the Franco-German University (DFH-UFA) and the Karlsruhe House of Young Scientists (KHYS).Lutz Weis acknowledges support from CRC 1173, DFG (Deutsche Forschungsgemeinschaft).
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Mathematics - Functional Analysis ,Mathematics - Classical Analysis and ODEs ,H\"ormander Type Spectral Multiplier Theorems ,Classical Analysis and ODEs (math.CA) ,FOS: Mathematics ,Functional calculus ,42A45, 47A60, 47B40, 47D03 ,[MATH.MATH-CA]Mathematics [math]/Classical Analysis and ODEs [math.CA] ,[MATH.MATH-FA]Mathematics [math]/Functional Analysis [math.FA] ,Functional Analysis (math.FA) - Abstract
We prove spectral multiplier theorems for H\"ormander classes $\mathcal{H}^\alpha\_p$ for 0-sectorial operators A on Banach spaces assuming a bounded $H^\infty(\Sigma\_\sigma)$ calculus for some $\sigma \in (0,\pi)$ and norm and certain R-bounds on one of the following families of operators: the semigroup $e^{--zA}$ on $\mathbb{C}\_+$, the wave operators $e^{isA}$ for $s \in \mathbb{R}$, the resolvent $(\lambda -- A)^{-1}$ on $\mathbb{C} \backslash \mathbb{R}$, the imaginary powers $A^{it}$ for $t \in \mathbb{R}$ or the Bochner-Riesz means $(1-A/u)^\alpha\_+$ for $u > 0.$ In contrast to the existing literature we neither assume that A operates on an Lp scale nor that A is self-adjoint on a Hilbert space. Furthermore, we replace (generalized) Gaussian or Poisson bounds and maximal estimates by the weaker notion of R-bounds, which allow for a unified approach to spectral multiplier theorems in a more general setting. In this setting our results are close to being optimal. Moreover, we can give a characterization of the (R-bounded) $\mathcal{H}^\alpha\_1$ calculus in terms of R-boundedness of Bochner-Riesz means., Comment: Mathematische Zeitschrift, Springer, 2018
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- 2018
8. Utility of Chatbot Literature Search in Radiation Oncology.
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Wong J, Kriegler C, Shrivastava A, Duimering A, and Le C
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Artificial intelligence and natural language processing tools have shown promise in oncology by assisting with medical literature retrieval and providing patient support. The potential for these technologies to generate inaccurate yet seemingly correct information poses significant challenges. This study evaluates the effectiveness, benefits, and limitations of ChatGPT for clinical use in conducting literature reviews of radiation oncology treatments. This cross-sectional study used ChatGPT version 3.5 to generate literature searches on radiotherapy options for seven tumor sites, with prompts issued five times per site to generate up to 50 publications per tumor type. The publications were verified using the Scopus database and categorized as correct, irrelevant, or non-existent. Statistical analysis with one-way ANOVA compared the impact factors and citation counts across different tumor sites. Among the 350 publications generated, there were 44 correct, 298 non-existent, and 8 irrelevant papers. The average publication year of all generated papers was 2011, compared to 2009 for the correct papers. The average impact factor of all generated papers was 38.8, compared to 113.8 for the correct papers. There were significant differences in the publication year, impact factor, and citation counts between tumor sites for both correct and non-existent papers. Our study highlights both the potential utility and significant limitations of using AI, specifically ChatGPT 3.5, in radiation oncology literature reviews. The findings emphasize the need for verification of AI outputs, development of standardized quality assurance protocols, and continued research into AI biases to ensure reliable integration into clinical practice., Competing Interests: Declarations. Conflict of Interest: All authors have completed the ICMJE uniform disclosure form and declare no conflict of interest., (© 2024. The Author(s) under exclusive licence to American Association for Cancer Education.)
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- 2024
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9. Impacts of Intrafraction Virtual Reality-Based Environment Modification on Procedural Anxiety, Heart Rate, and Overall Radiation Therapy Experience During External Beam Radiation Therapy.
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Kriegler C, Debenham B, Piva M, Bernardo M, Bylhouwer A, Karim T, Zhu YM, Belliveau GT, Merrick B, and Al Balushi M
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Purpose: Procedural anxiety of cancer treatments may negatively impact patients and treatments. Mindfulness-promoting environment modification with virtual reality (VR) is increasingly used across medicine to minimize procedural anxiety. We aimed to assess the impacts of intrafraction mindfulness-promoting VR use during external beam radiation therapy (EBRT) on radiation therapy experience and physiological measures of distress., Methods and Materials: Adult patients receiving EBRT between May and October 2023 at our institution without contraindications to wearing VR were eligible. Participants had heart rates recorded before and after EBRT and completed a post-EBRT survey for 1 treatment without intervention, and 1 using VR. Participants completed the Radiotherapy Experience Questionnaire and additional questions regarding VR. Quantitative data were compared between conditions using paired samples t test., Results: Fifty-two participants completed the project. Between pre- and post-EBRT, a significant decrease in heart rate with VR was noted (80.35 bpm vs 71.79 bpm; P < .0001*), but not in the control condition (78.90 bpm vs 78.10 bpm; P = .44). Post-EBRT heart rate was significantly lower with VR than without (71.79 bpm vs 78.10 bpm; P < .01*). Radiotherapy Experience Questionnaire responses showed participants had significantly lower situational unease (1.46 vs 2.02; P < .001*), a more beneficial situational response (1.55 vs 2.12; P < .01*), and improved environment acceptance (1.30 vs 1.60; P < .01*) when using VR. Most endorsed VR as comfortable (94%), improved treatment experience (86%), and would recommend it to others (86%)., Conclusions: We report the first evidence of the impacts of intrafraction mindfulness-promoting VR use during EBRT. Physiological measures of distress and patient perspectives suggest that VR can minimize procedural anxiety, is well tolerated, and improves the overall treatment experience. Further research should explore modifying this tool for patients unable to wear headsets and determining where the most clinically significant benefits can be found., Competing Interests: Giselle Tucker Belliveau reports financial support was provided by Canadian Association of Radiation Oncology. The other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Author(s).)
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- 2024
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10. Didactic Instruction's Impact on Medicolegal Quality of Radiation Oncology Resident Physician Documentation.
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Patel V, Duimering A, Loewen SK, and Kriegler C
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Effective documentation serves as a cornerstone for communication and patient care, especially in radiation oncology (RO). Studies have shown room for improvement in documentation practices, and although documentation guidelines exist, it is uncertain if RO physicians are aware of or adhere to them. We aimed to assess RO resident physicians' medicolegal knowledge and the impact of an educational intervention on documentation practices. Grading rubrics for consultation and progress notes were created using guidelines, comprising of a fundamental score and total score. Residents from two institutions attended a didactic seminar on medicolegal documentation. Pre- and post-seminar, an electronic anonymous survey was used to assess resident knowledge and perspectives and random resident consultation and progress notes were scored. Mean documentation and survey item scores from pre- and post-seminar were compared. Fourteen resident physicians participated and completed surveys, and 48 consultation notes and 40 progress notes were analyzed. No participant had prior education specific to RO documentation, nor were any aware of available resources. Post-seminar, participants' medicolegal documentation knowledge significantly increased (86.61% vs. 95.54%, p = 0.001), as did the fundamental score (83.64% vs 89.29%, p = 0.041) and total scores of consultation notes (69.82% vs. 78.98%, p = 0.001) and total score of progress notes (55% vs. 75.19%, p < 0.001). Our seminar significantly enhanced residents' medicolegal knowledge and quality of documentation, and surveys revealed a lack of speciality specific documentation education. This combined with findings from other studies and participant opinions suggest that resident physicians would benefit from such training during residency., (© 2024. The Author(s) under exclusive licence to American Association for Cancer Education.)
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- 2024
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11. Do Radiation Oncology Residents Have a Preferred Radiation Treatment Planning Review Format?
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Kriegler C, Al Balushi M, Zhu YM, Hill J, Beruar A, Ghosh S, Fairchild A, and Severin D
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- Humans, Canada, Surveys and Questionnaires, Learning, Internship and Residency, Radiation Oncology education
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In an era of increasing virtual communication, we aimed to investigate current formats used by radiation oncology residents for reviewing radiation treatment plans with attendings, preferences for formats, and reasons contributing to preferences. Residents enrolled in Canadian radiation oncology programs received questionnaires examining training level, typical review formats, preferred format, and reasons for preference. Analysis excluded PGY-1s due to insufficient exposure. Fifty-two residents participated. National response rate was 55%. Overall, hybrid review was the most used format (77%). Virtual review was the most preferred format (44%). Preference for virtual review was most common among junior residents (57%), while in-person review was most preferred by senior residents (45.4%). Few residents typically use their preferred format (35%). Reasons for preference varied between groups in convenience (p < 0.01), interactivity (p < 0.01), and teaching quality (p = 0.04). The persistence of e-learning suggests that virtual treatment planning education will continue to some degree. Junior residents prefer virtual review, while a clearly preferred review format was less apparent among senior residents. Preferences are multifactorial, and the trends seen in reasons for preference between formats may reflect advantages inherent to each. Progress is still needed in optimizing treatment planning education, as suggested by few residents using their preferred format. Residents and staff should collectively decide which educational format for treatment planning best meets educational needs., (© 2023. The Author(s) under exclusive licence to American Association for Cancer Education.)
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- 2023
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12. Evidence for abnormal visuospatial attentional processes in the interictal migraineur.
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Kriegler C, Cruz MT, Sun G, Friedrich TE, Elias LJ, and Mickleborough MJS
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- Attention, Bias, Brain, Humans, Functional Laterality, Space Perception
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Research shows decreased brain region activity in the right temporo-parietal junction (rTPJ) in people with migraine headache relative to headache-free controls when performing an orienting visuospatial attention task. Functional inactivation of the rTPJ has been associated with rightward performance deviations on laterality-based attention Landmark (LM) and greyscale (GRE) tasks in individuals with unilateral neglect and heightened activation in the rTPJ is associated with leftward deviation, known as pseudoneglect, in controls on these tasks. Given this, we investigated whether migraineurs would lack the leftward deviation found in headache-free controls on visuospatial attention tasks. 36 migraineurs and 38 controls were presented with LM and GRE tasks. Response bias scores showed a significant difference in responses between groups ( p = 0.036) on the GRE, a luminance-based task, but not on the LM, a size-based task ( p = 0.826). This study is the first to show laterality-based attentional differences in migraineurs, as compared to controls. Specifically, migraineurs were found to have smaller leftward biases on luminance-based visuospatial attention tasks, as compared to controls, aligning with previous research suggesting that migraine may be having an impact on a variety of attention tasks in migraineurs in between headache attacks.
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- 2020
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13. Differentiation of ventricular tachycardia from ventricular fibrillation using intraventricular electrogram morphology.
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DiCarlo LA, Jenkins JM, Winston SA, and Kriegler C
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- Cardiac Catheterization, Cardiac Pacing, Artificial, Diagnosis, Differential, Electric Countershock instrumentation, Humans, Pacemaker, Artificial, Prostheses and Implants, Electrocardiography methods, Signal Processing, Computer-Assisted, Tachycardia diagnosis, Ventricular Fibrillation diagnosis
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- 1992
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14. Intraventricular electrogram analysis for discrimination of ventricular tachycardia from ventricular fibrillation.
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DiCarlo LA, Jenkins JM, and Kriegler C
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- Humans, Electrocardiography, Tachycardia diagnosis, Ventricular Fibrillation diagnosis
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- 1992
- Full Text
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