9 results on '"Erpenbeck S"'
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2. P091 - REPRODUCTIVE HEALTHCARE EXPERIENCES AND PERCEPTIONS AMONG SEX WORKERS IN THE US: A COMMUNITY-PARTNERED QUALITATIVE STUDY
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Kislovskiy, Y, Sahawneh, F, Snyder, M, Erpenbeck, S, Martina, J, Judkins, C, Miller, E, and Chang, JC
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- 2023
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3. Finite Element Modeling of Orthogonal Metal Cutting
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Komvopoulos, K., primary and Erpenbeck, S. A., additional
- Published
- 1991
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4. Finite Element Modeling of Orthogonal Metal Cutting
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Komvopoulos, K. and Erpenbeck, S. A.
- Abstract
The finite element method was used to model chip formation in orthogonal metal cutting. Emphasis was given on analyzing the effect of important factors, such as plastic flow of the workpiece material, friction at the tool-workpiece interface, and wear of the tool, on the cutting process. To simulate separation of the chip from the workpiece, superposition of two nodes at each nodal location of a parting line of the initial mesh was imposed. According to the developed algorithm, the superimposed nodes were constrained to assume identical displacements, until approaching to a specified small distance from the tool tip. At that juncture, the displacement constraint was removed and separation of the nodes was allowed. Under the usual plane strain assumption, quasi-static finite element simulations of orthogonal metal cutting were performed for interfacial friction coefficients equal to zero, 0.15, and 0.5 and unworn or worn (cratered) tools having a strongly adherent built-up edge. To investigate the significance of the deformation of the workpiece material on the cutting process, elastic-perfectly plastic and elastic-plastic with isotropic strain hardening and strain rate sensitivity constitutive laws were used in the analysis. For simplicity, the tool material and the built-up edge were modeled as perfectly rigid. In all cases analyzed, the cutting speed and depth of cut were set equal to 183 m/min and 1.27 mm, respectively. Experiments confirmed that cutting of AISI 4340 steel with ceramic-coated tools under similar conditions led to the development of a built-up edge and the formation of continuous chips. The dimensions of the crater, assumed in the finite element simulations involving a cratered tool, were also determined from the same cutting experiments. Spatial distributions of the equivalent total plastic strain and the von Mises equivalent stress corresponding to steady-state cutting conditions and the normal and shear stresses at the rake face are contrasted and interpreted qualitatively in terms of critical parameters. The influence of interfacial friction, metal flow characteristics, and wear at the rake face of the tool on the steady-state magnitudes of the cutting forces, shear plane angle, chip thickness, and chip-tool contact length are also elucidated. Several aspects of the metal cutting process predicted by the finite element model agreed well with experimental results and phenomenological observations.
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- 1991
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5. Implementation of a Standardized Process of Coude Catheter Insertion Decreases Traumatic Catheterizations.
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Miller D, Pelzman D, Bonfili J, Erpenbeck S, Orikogbo O, Risnear A, Pekala K, Maganty A, Jones R, Jackman S, and Rusilko P
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Objective: To address the issue of traumatic foley catheterization, we developed and implemented a coude catheter education program for operating room nurses as well as standardize the usage of a coude catheter for male patients. Traumatic catheterization leads to patient morbidity and increased healthcare costs., Methods: A retrospective review was conducted to identify all traumatic catherizations over a 6-month period for several surgical services at our institution. A nursing education program was implemented that included basic urological anatomy, coude urethral catheter insertion techniques, and catheter safety. We conducted our trial over a period of 2 months with all catheterizations tracked. Following the trial, the process and outcomes were reviewed and then implemented for all male patients >18 years old requiring indwelling catheter placement in the operating room., Results: On retrospective review, there were 18 traumatic foley catheterizations of patients on the 3 surgical services out of a total 601 catheter placements (3% traumatic placement rate). The total cost of these traumatic catherizations was $27,793 when accounting for additional procedures, supplies, and additional OR time required for each traumatic catheterization. The average cost per patient was $1544. After full implementation of the process across all operating room services in June 2021, there have been 2038 catheterizations performed using a coude catheter kit with 4 traumatic foley placements through May 2022 (0.2% traumatic catheterization rate)., Conclusion: Implementation of the nursing education program and utilization of the coude catheter for all male catheterizations reduces costs, decreases iatrogenic urethral injury, and improves patient safety., Competing Interests: Declaration of Competing Interest The authors have no conflict of interest to declare., (Copyright © 2024 Elsevier Inc. All rights reserved.)
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- 2024
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6. A Three-Dimensional-Based Morphometric Analysis of a Standardized Overcorrection Technique for Fronto-Orbital Advancement in Metopic Craniosynostosis.
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Pfaff MJ, Bruce MK, Erpenbeck S, Mittal A, Beiriger JW, Zhu X, Dvoracek L, and Goldstein JA
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- Child, Preschool, Humans, Retrospective Studies, Tomography, X-Ray Computed methods, Craniosynostoses diagnostic imaging, Craniosynostoses surgery, Plastic Surgery Procedures, Imaging, Three-Dimensional
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Introduction: The concept of "overcorrection" for trigonocephaly has been reported to achieve both anterior cranial fossa expansion and normalization of craniofacial form. The purpose of this study is to describe in detail a standardized technique to fronto-orbital advancement utilizing the concept of "overcorrection" and objectively evaluate intermediate results., Methods: This retrospective study included patients with isolated metopic synostosis who underwent surgery via the proposed surgical technique and age and sex-matched unaffected controls. Craniofacial morphometric analysis was performed on pre-, immediate post-, and intermediate postoperative (>2 years) three-dimensional (3D)-rendered computed tomographic (CT) scans and photographs. Key CT-based measurements included interzygomaticofrontal suture distance (IZFS), endocranial bifrontal angle (ECA), and temporal expansion. 3D photogrammetry was performed using established measurements and associated Z-scores converted. A Paired t -test and analysis of variance were performed when appropriate., Results: Forty-one patients were included. A comparison of pre- and immediate postoperative CT scans demonstrated statistically significant increases in all measurements. Subset analysis of 12 patients with intermediate follow-up (age: 39.6 ± 3.6 months) demonstrated significant differences from preoperative values except for IZFS, which decreased from immediate postoperative values and was smaller than age- and sex-matched controls. 3D photogrammetry demonstrated a mean Z-score above the norm for frontal breath. 3D photogrammetry is also positively correlated with CT-based measurements., Conclusions: This standardized "overcorrection" approach for trigonocephaly can provide the appropriate changes to maintain a normal ECA despite a reduction in bifrontal width over time. 3D photogrammetry positively correlated with CT-based measurements and may provide useful information when following patients clinically. Long-term follow-up assessment to determine the necessary degree of overcorrection at skeletal mature is needed.
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- 2023
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7. HIV awareness, pre-exposure prophylaxis perceptions and experiences among people who exchange sex: qualitative and community based participatory study.
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Kislovskiy Y, Erpenbeck S, Martina J, Judkins C, Miller E, and Chang JC
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- Homosexuality, Male, Humans, Male, Sexual Partners, Anti-HIV Agents therapeutic use, HIV Infections drug therapy, HIV Infections prevention & control, Pre-Exposure Prophylaxis methods, Sexually Transmitted Diseases prevention & control
- Abstract
Background: People who exchange sex for money, favors, goods or services, combat higher risk of acquiring sexually transmitted diseases (STDs) and human immunodeficiency virus (HIV). Understanding barriers to STD and HIV related healthcare from the perspective of this stigmatized and marginalized community may improve access to sexual health services including pre-exposure prophylaxis (PrEP). METHODS: We used community-partnered participatory and qualitative methods to conduct anonymous one-on-one interviews with people who exchange sex to understand their perspectives and experiences related to pre-exposure prophylaxis (PrEP) to prevent HIV acquisition. We conducted twenty-two interviews and coded them to perform thematic analysis. RESULTS: We identified five themes: (1) Appreciation of HIV risk and prevention strategies grew from information accumulated over time. (2) PrEP information came from a variety of sources with mixed messages and uncertain credibility. (3) Decision-making about use of PrEP was relative to other behavioral decisions regarding exchange sex. (4) The multi-step process of obtaining PrEP presented multiple potential barriers. (5) Healthcare providers were seen as powerful facilitators to PrEP utilization., Conclusions: Our findings suggest that PrEP education and care needs to be made more relevant and accessible to individuals who exchange sex., (© 2022. The Author(s).)
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- 2022
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8. Stroke Network of Wisconsin (SNOW) Scale Predicts Large Vessel Occlusion Stroke in the Prehospital Setting.
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Panichpisal K, Erpenbeck S, Vilar P, Babygirija RP, Singh M, Colella MR, and Rovin RA
- Abstract
Purpose: In previous trials, the Stroke Network of Wisconsin (SNOW) scale accurately predicted large vessel occlusion (LVO) stroke in the hospital setting. This study evaluated SNOW scale performance in the prehospital setting and its ability to predict LVO or distal medium vessel occlusion (DMVO) in patients suspected of having acute ischemic stroke (AIS), a scenario in which transport time to an endovascular treatment-capable facility (ECSC) is critical., Methods: All potential AIS patients with last-known-well time of ≤24 hours were assessed by Milwaukee County Emergency Medical Services for LVO using SNOW. Patients with a positive SNOW score were transferred to the nearest ECSC. One such facility, Aurora St. Luke's Medical Center (ASLMC), was the source of all patient data analyzed in this study. LVO was defined as occlusion of the intracranial carotid artery, middle cerebral artery (M1) segment, or basilar artery., Results: From March 2018 to February 2019, 345 AIS-suspected patients were transported to ASLMC; 19 patients were excluded because no vascular imaging was performed. Of 326 patients, 32 had confirmed LVO and 21 DMVO. For identifying LVO, SNOW scale sensitivity was 0.88, specificity 0.40, positive predictive value (PPV) 0.14, negative predictive value (NPV) 0.97, and area under the curve (AUC) 0.64. Ability to predict DMVO was similar. Overall, the SNOW scale showed sensitivity of 0.83, specificity of 0.39, PPV of 0.10, NPV of 0.97, and AUC of 0.60 in identifying candidates for endovascular thrombectomy., Conclusions: In a prehospital setting, the SNOW scale has high sensitivity in identifying candidates for endovascular thrombectomy and proved highly reliable in ruling out stroke due to LVO., Competing Interests: Conflicts of Interest None., (© 2022 Aurora Health Care, Inc.)
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- 2022
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9. Does the method of visualization impact the performance of a new surgical task in novice subjects?
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Kassam M, Chakravarthi S, Epping A, Erpenbeck S, Singh M, Fukui MB, Kassam AB, and Rovin RA
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- Humans, Neurosurgical Procedures, Suture Techniques, Task Performance and Analysis, Clinical Competence, Laparoscopy
- Abstract
Introduction: Evolution of optical technology from two-dimensional to three-dimensional (3D) systems has come with an associated loss of stereoscopy and 3D depth perception. This report compares performance of surgical tasks in unbiased subjects using these systems., Methods: Untrained subjects were randomized into two groups, robotically operated video optical telescopic-microscope (ROVOT) or surgical microscope (microscope). Subjects sutured and tied knots. Completion time, NASA-Task Load Index (TLX), and galvanic skin responses were analyzed., Results: Intergroup analysis of suture completion time indicated that microscope use was significantly faster compared to ROVOT, whether used first or second. Regardless of which methodology was used first, the second modality was faster, indicating a transfer effect. NASA-TLX indicated that mental, performance, effort, and frustration were all greater with ROVOT., Conclusion: Task completion time and perceived effort were greater with ROVOT. Task completion times improved with repetition regardless of visual modality., (© 2020 John Wiley & Sons, Ltd.)
- Published
- 2020
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