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Lee WJ, Moon CH, Yoon W, Kim M, Kim WJ, Kim KM, Lee H, Jeong SM, Yu JH, Kim DH. Open-heart surgery using Del-Nido cardioplegia in two dogs: partial atrioventricular septal defect and mitral repair. J Vet Sci 2023; 24:e47. [PMID: 37271514 DOI: 10.4142/jvs.23088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/02/2023] [Accepted: 05/08/2023] [Indexed: 06/06/2023] Open
Abstract
Del-Nido cardioplegia (DNc) is a single-dose cardioplegia that is widely used in human medicine because of its long duration. In this report, we describe two cases of open-heart surgery with cardiopulmonary bypass (CPB) using DNc. One dog was diagnosed with partial atrioventricular septal defect, and the other dog was diagnosed with myxomatous mitral valve disease stage D. Both dogs were treated with open-heart surgery with DNc to induce temporary cardiac arrest. No complications from DNc were observed, and the patients were discharged. Veterinary heart surgeons should consider DNc as an option for temporary cardiac arrest during open-heart surgery with CPB.
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Affiliation(s)
- Won-Jong Lee
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Chang-Hwan Moon
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | | | - Mihyung Kim
- Chungnam National University Sejong Hospital, Sejong 30099, Korea
| | - Woo-Jin Kim
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Kyung-Min Kim
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Haebeom Lee
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Seong-Mok Jeong
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Jae Hyeon Yu
- Department of Cardiothoracic Surgery, Chungnam National University Hospital, College of Medicine, Chungnam National University, Daejeon 35015, Korea
| | - Dae-Hyun Kim
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.
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Park MJ, Lee SE, Yoon W, Park HJ, Kim SH, Oh SH, Lee DG, Pyeon DB, Kim EY, Park SP. Effect of supplementation of cryoprotectant solution with hydroxypropyl cellulose for vitrification of bovine oocytes. Cryo Letters 2023; 44:37-46. [PMID: 36629840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Successful cryopreservation of bovine oocytes is very important for research and commercial applications. However, the survival and development rate of vitrified-thawed (VT) oocytes are lower than those of non-vitrified-thawed (non-VT) oocytes. OBJECTIVE To investigate the effect of adding hydroxypropyl cellulose (HPC) to the vitrification solution for bovine oocytes. MATERIALS AND METHODS For vitrification, bovine metaphase II oocytes were pretreated with a solution containing 10% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 5 min, exposed to a solution containing 30% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 30 s, and then directly plunged into liquid nitrogen. RESULTS The survival rate of oocytes was significantly higher in the 50 HPC group than in the 0, 10, and 100 HPC groups. The reactive oxygen species level was lower in the non-VT and 50 HPC groups than in the other groups. The mRNA levels of proapoptotic genes (Bax) were lower in the non-VT, 0, and 50 HPC groups than in the other groups. The mRNA levels of antiapoptotic genes (BCl2) were higher in the non-VT than in the other groups. The development rates of embryos (day 8) obtained via parthenogenetic activation (PA) were determined in the non-VT, 0 HPC, and 50 HPC groups. The cleavage rate was significantly higher in the non-VT group. CONCLUSION Supplementation of vitrification solution with HPC improves the survival of VT bovine oocytes and the development capacity of embryos derived from these oocytes via PA. doi.org/10.54680/fr23110110212.
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Affiliation(s)
- M J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S E Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - W Yoon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - H J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Oh
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D G Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D B Pyeon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - E Y Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea
| | - S P Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea.
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3
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Park MJ, Lee SE, Yoon W, Park HJ, Kim SH, Oh SH, Lee DG, Pyeon DB, Kim EY, Park SP. Effect of supplementation of cryoprotectant solution with hydroxypropyl cellulose for vitrification of bovine oocytes. Cryo Letters 2022; 44:37-46. [PMID: 36625874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Successful cryopreservation of bovine oocytes is very important for research and commercial applications. However, the survival and development rate of vitrified-thawed (VT) oocytes are lower than those of non-vitrified-thawed (non-VT) oocytes. OBJECTIVE To investigate the effect of adding hydroxypropyl cellulose (HPC) to the vitrification solution for bovine oocytes. MATERIALS AND METHODS For vitrification, bovine metaphase II oocytes were pretreated with a solution containing 10% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 5 min, exposed to a solution containing 30% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 30 s, and then directly plunged into liquid nitrogen. RESULTS The survival rate of oocytes was significantly higher in the 50 HPC group than in the 0, 10, and 100 HPC groups. The reactive oxygen species level was lower in the non-VT and 50 HPC groups than in the other groups. The mRNA levels of proapoptotic genes (Bax) were lower in the non-VT, 0, and 50 HPC groups than in the other groups. The mRNA levels of antiapoptotic genes (BCl2) were higher in the non-VT than in the other groups. The development rates of embryos (day 8) obtained via parthenogenetic activation (PA) were determined in the non-VT, 0 HPC, and 50 HPC groups. The cleavage rate was significantly higher in the non-VT group. CONCLUSION Supplementation of vitrification solution with HPC improves the survival of VT bovine oocytes and the development capacity of embryos derived from these oocytes via PA. doi.org/10.54680/fr23110110212.
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Affiliation(s)
- M J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S E Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - W Yoon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - H J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Oh
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D G Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D B Pyeon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - E Y Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea
| | - S P Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea.
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Chung D, Yoon W. P14.51 Brain mapping for mentalizing in GBM patient. Neuro Oncol 2019. [DOI: 10.1093/neuonc/noz126.286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
BACKGROUND
Glioblastoma is a disease with very poor outcome. Most patients underwent maximal safe resection, especially focusing in the preservation of motor and language function. However, many caregivers were suffered from the blockage of emotion communication with patients. So the definition of maximal safe resection must include the preservation of cognition and mentalizing of patients. Here we present the experience of brain mapping in awake surgery to preserve mentalizing.
MATERIAL AND METHODS
A 61-year-old male patient with headache was transferred to our hospital because of brain tumor on CT scan checked in another hospital. On the initial MRI, multi-septate cystic tumor was shown on left medial prefrontal area. The patient was recommended the surgical resection, but patient discharged with the denial of the operation. Ten days later, patient visited our hospital again with slowness of response by the enlargement of tumor size. The tumor extensively involved left cingulum and corpus callosum at anterior part. On diffusion tensor image, tumor located at mediosuperior part of inferior fronto-occipital fasciculus (IFOF). The patient showed deficit of visual and verbal memory, generative naming ability, and phonemic generative naming ability on preoperative neuropsychological test (SNSB-II). Pyramid and palm tree test (PPTT) and ‘Reading the Mind in the Eyes’ test (RMET) were also performed to evaluate the semantic association function and mentalizing preoperatively.
RESULTS
The patient underwent awake surgery with asleep-awake-asleep technique. The tumor was resected until identification of incorrect response to PPTT or RMET on subcortical stimulation (Ojeman stimulator, 1.5mA, 60Hz, biphasic). The histopathologic diagnosis was glioblastoma. Small part of tumor was remained on cingulum, but patient was discharged without change of mentalizing.
CONCLUSION
Although the patients with glioblastomas show poor outcome, we think that it is important to consider the cognition and mentalizing of patients for emotion communication with caregivers. With awake surgery, mentalizing can be preserved in selective patients.
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Affiliation(s)
- D Chung
- Incheon St. Mary’s Hospital, Incheon, Korea, Republic of
| | - W Yoon
- Incheon St. Mary’s Hospital, Incheon, Korea, Republic of
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Jaeckel FT, Ambarish CV, Christensen N, Gruenke R, Hu L, McCammon D, McPheron M, Meyer M, Nelms KL, Roy A, Wulf D, Zhang S, Zhou Y, Adams JS, Bandler SR, Chervenak JA, Datesman AM, Eckart ME, Ewin AJ, Finkbeiner FM, Kelley R, Kilbourne CA, Miniussi AR, Porter FS, Sadleir JE, Sakai K, Smith SJ, Wakeham N, Wassell E, Yoon W, Morgan KM, Schmidt DR, Swetz DS, Ullom JN. Energy calibration of high-resolution X-Ray TES microcalorimeters with 3 eV optical photons. IEEE Trans Appl Supercond 2019; 29:2100104. [PMID: 31186605 PMCID: PMC6557579 DOI: 10.1109/tasc.2019.2899856] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
With the improving energy resolution of transitionedge sensor (TES) based microcalorimeters, performance verification and calibration of these detectors has become increasingly challenging, especially in the energy range below 1 keV where fluorescent atomic X-ray lines have linewidths that are wider than the detector energy resolution and require impractically high statistics to determine the gain and deconvolve the instrumental profile. Better behaved calibration sources such as grating monochromators are too cumbersome for space missions and are difficult to use in the lab. As an alternative, we are exploring the use of pulses of 3 eV optical photons delivered by an optical fiber to generate combs of known energies with known arrival times. Here, we discuss initial results of this technique obtained with 2 eV and 0.7 eV resolution X-ray microcalorimeters. With the 2 eV detector, we have achieved photon number resolution for pulses with mean photon number up to 133 (corresponding to 0.4 keV).
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Affiliation(s)
- F T Jaeckel
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - C V Ambarish
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - N Christensen
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - R Gruenke
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - L Hu
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - D McCammon
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - M McPheron
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - M Meyer
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - K L Nelms
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - A Roy
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - D Wulf
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - S Zhang
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - Y Zhou
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706
| | - J S Adams
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - S R Bandler
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - J A Chervenak
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - A M Datesman
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - M E Eckart
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - A J Ewin
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - F M Finkbeiner
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - R Kelley
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - C A Kilbourne
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - A R Miniussi
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - F S Porter
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - J E Sadleir
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - K Sakai
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - S J Smith
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - N Wakeham
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - E Wassell
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - W Yoon
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771
| | - K M Morgan
- National Institute for Standards and Technology, 325 Broadway, Boulder, CO 80305
| | - D R Schmidt
- National Institute for Standards and Technology, 325 Broadway, Boulder, CO 80305
| | - D S Swetz
- National Institute for Standards and Technology, 325 Broadway, Boulder, CO 80305
| | - J N Ullom
- National Institute for Standards and Technology, 325 Broadway, Boulder, CO 80305
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Baek BH, Lee YY, Kim SK, Yoon W. Pretreatment Anterior Choroidal Artery Infarction Predicts Poor Outcome after Thrombectomy in Intracranial ICA Occlusion. AJNR Am J Neuroradiol 2019; 40:1349-1355. [PMID: 31272965 DOI: 10.3174/ajnr.a6126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 06/13/2019] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND PURPOSE Predictors of outcome after endovascular thrombectomy have not been investigated adequately in patients with intracranial ICA occlusions. This study aimed to assess the impact of anterior choroidal artery infarction in pretreatment DWI on the outcome of patients with acute intracranial ICA occlusion who underwent thrombectomy. MATERIALS AND METHODS This study included 113 patients with acute intracranial ICA occlusion who underwent DWI followed by thrombectomy between January 2011 and July 2016. Characteristics and outcomes were compared between the groups positive and negative for anterior choroidal artery infarction and patients with good outcomes (90-day mRS 0-2) and poor outcomes (mRS 3-6). Binary logistic regression analyses were performed to identify independent predictors of a good outcome. RESULTS On pretreatment DWI, anterior choroidal artery infarction was observed in 60 patients (53.1%). Good outcomes were significantly less frequent in the group positive for anterior choroidal artery infarction than in the group negative for it (25% versus 49.1%, P = .008). Parenchymal hemorrhage occurred only in the group positive for anterior choroidal artery infarction (13.3% versus 0%, P = .007). In the multivariate logistic regression analysis, independent predictors of good outcome were an absence of anterior choroidal artery infarction (OR, 0.333; 95% CI, 0.135-0.824; P = .017) and successful reperfusion (OR, 5.598; 95% CI, 1.135-27.604; P = .034). CONCLUSIONS Pretreatment anterior choroidal artery infarction is associated with parenchymal hemorrhage and poor outcome after thrombectomy in patients with acute intracranial ICA occlusion. In addition, the absence of anterior choroidal artery infarction and successful reperfusion were independent predictors of good outcome after thrombectomy in acute intracranial ICA occlusion.
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Affiliation(s)
- B H Baek
- From the Department of Radiology, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Y Y Lee
- From the Department of Radiology, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - S K Kim
- From the Department of Radiology, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - W Yoon
- From the Department of Radiology, Chonnam National University Medical School, Gwangju, Republic of Korea.
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Zhou Y, Ambarish CV, Gruenke R, Jaeckel FT, Kripps KL, McCammon D, Morgan KM, Wulf D, Zhang S, Adams JS, Bandler SR, Chervenak JA, Datesman AM, Eckart ME, Ewin AJ, Finkbeiner FM, Kelley RL, Kilbourne CA, Miniussi AR, Porter FS, Sadleir JE, Sakai K, Smith SJ, Wakeham NA, Wassell EJ, Yoon W. Mapping TES Temperature Sensitivity and Current Sensitivity as a Function of Temperature, Current, and Magnetic Field with IV curve and Complex Admittance Measurements. J Low Temp Phys 2018; 193:321-327. [PMID: 31186584 PMCID: PMC6557576 DOI: 10.1007/s10909-018-1970-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 05/14/2018] [Indexed: 06/09/2023]
Abstract
We have specialized astronomical applications for X-ray microcalorimeters with superconducting transition edge sensors (TESs) that require exceptionally good TES performance, but which operate in the small-signal regime. We have therefore begun a program to carefully characterize the entire transition surface of TESs with and without the usual zebra stripes to see if there are reproducible local "sweet spots" where the performance is much better than average. These measurements require precise knowledge of the circuit parameters. Here, we show how the Shapiro effect can be used to precisely calibrate the value of the shunt-resistor. We are also investigating the effects of stress and external magnetic fields to better understand reproducibility problems.
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Affiliation(s)
- Y Zhou
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - C V Ambarish
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - R Gruenke
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - F T Jaeckel
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - K L Kripps
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - D McCammon
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - K M Morgan
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - D Wulf
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - S Zhang
- Physics Department, University of Wisconsin - Madison, Madison, WI, USA
| | - J S Adams
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - S R Bandler
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - J A Chervenak
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - A M Datesman
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - M E Eckart
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - A J Ewin
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | | | - R L Kelley
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - C A Kilbourne
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - A R Miniussi
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - F S Porter
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - J E Sadleir
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - K Sakai
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - S J Smith
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - N A Wakeham
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - E J Wassell
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - W Yoon
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
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8
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Yoon W, Yoo Y, Chae Y, Kee SH, Kim B. Therapeutic advantage of genetically engineered Salmonella typhimurium carrying short hairpin RNA against inhibin alpha subunit in cancer treatment. Ann Oncol 2018; 29:2010-2017. [DOI: 10.1093/annonc/mdy240] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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9
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Wassell EJ, Adams JS, Bandler SR, Betancourt-Martinez GL, Chiao MP, Chang MP, Chervenak JA, Datesman AM, Eckart ME, Ewin AJ, Finkbeiner FM, Ha JY, Kelley R, Kilbourne CA, Miniussi AR, Sakai K, Porter F, Sadleir JE, Smith SJ, Wakeham NA, Yoon W. Fabrication of X-ray Microcalorimeter Focal Planes Composed of Two Distinct Pixel Types. IEEE Trans Appl Supercond 2017; 27:2300205. [PMID: 28804229 PMCID: PMC5548520 DOI: 10.1109/tasc.2016.2633783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We are developing superconducting transition-edge sensor (TES) microcalorimeter focal planes for versatility in meeting specifications of X-ray imaging spectrometers including high count-rate, high energy resolution, and large field-of-view. In particular, a focal plane composed of two sub-arrays: one of fine-pitch, high count-rate devices and the other of slower, larger pixels with similar energy resolution, offers promise for the next generation of astrophysics instruments, such as the X-ray Integral Field Unit (X-IFU) instrument on the European Space Agency's Athena mission. We have based the sub-arrays of our current design on successful pixel designs that have been demonstrated separately. Pixels with an all gold X-ray absorber on 50 and 75 micron scales where the Mo/Au TES sits atop a thick metal heatsinking layer have shown high resolution and can accommodate high count-rates. The demonstrated larger pixels use a silicon nitride membrane for thermal isolation, thinner Au and an added bismuth layer in a 250 micron square absorber. To tune the parameters of each sub-array requires merging the fabrication processes of the two detector types. We present the fabrication process for dual production of different X-ray absorbers on the same substrate, thick Au on the small pixels and thinner Au with a Bi capping layer on the larger pixels to tune their heat capacities. The process requires multiple electroplating and etching steps, but the absorbers are defined in a single ion milling step. We demonstrate methods for integrating heatsinking of the two types of pixel into the same focal plane consistent with the requirements for each sub-array, including the limiting of thermal crosstalk. We also discuss fabrication process modifications for tuning the intrinsic transition temperature (Tc) of the bilayers for the different device types through variation of the bilayer thicknesses. The latest results on these "hybrid" arrays will be presented.
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Affiliation(s)
- E J Wassell
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. Stinger-Ghaffarian Technologies, Inc., Greenbelt, MD 20771 USA
| | - J S Adams
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. CRESST, University of Maryland, College Park, MD 20742 USA
| | - S R Bandler
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - G L Betancourt-Martinez
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. University of Maryland, College Park, MD 20742 USA
| | - M P Chiao
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - M P Chang
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - J A Chervenak
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - A M Datesman
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. Stinger-Ghaffarian Technologies, Inc., Greenbelt, MD 20771 USA
| | - M E Eckart
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - A J Ewin
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - F M Finkbeiner
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. Wyle Information Systems, McLean, VA 22102 USA
| | - J Y Ha
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. SB Microsystems Inc., Glen Burnie, MD 20161 USA
| | - R Kelley
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - C A Kilbourne
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - A R Miniussi
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - K Sakai
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. Universities Space Research Association, MD, USA
| | - F Porter
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - J E Sadleir
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
| | - S J Smith
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. CRESST, University of Maryland, College Park, MD 20742 USA
| | - N A Wakeham
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. Universities Space Research Association, MD, USA
| | - W Yoon
- NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA. Universities Space Research Association, MD, USA
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Lee YY, Yoon W, Kim SK, Baek BH, Kim GS, Kim JT, Park MS. Acute Basilar Artery Occlusion: Differences in Characteristics and Outcomes after Endovascular Therapy between Patients with and without Underlying Severe Atherosclerotic Stenosis. AJNR Am J Neuroradiol 2017; 38:1600-1604. [PMID: 28546252 DOI: 10.3174/ajnr.a5233] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 03/24/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Prediction of underlying intracranial atherosclerotic stenosis before endovascular therapy might be helpful for appropriate therapeutic planning in patients with acute ischemic stroke. This study aimed to compare the characteristics and treatment outcomes in patients with acute basilar artery occlusion relative to the existence or nonexistence of underlying intracranial atherosclerotic stenosis. MATERIALS AND METHODS Sixty-two patients with acute basilar artery occlusion underwent multimodal endovascular therapy. All patients underwent stent-retriever thrombectomy as a first-line endovascular therapy. Patients with underlying intracranial atherosclerotic stenosis underwent additional intracranial angioplasty and stent placement. The clinical and imaging characteristics and treatment outcomes were retrospectively analyzed and compared between patients with and without intracranial atherosclerotic stenosis. RESULTS Underlying intracranial atherosclerotic stenosis was identified at the occlusion site in 15 patients (24.1%). Occlusion in the proximal segment of the basilar artery was more common in patients with intracranial atherosclerotic stenosis (60% versus 6.4%, P < .001), whereas occlusion in the distal segment was more common in those without it (91.5% versus 26.7%, P < .001). Bilateral thalamic infarction on a pretreatment DWI was less common in patients with intracranial atherosclerotic stenosis (0% versus 27.7%, P = .027) compared with those without it. There were no significant differences in the rates of successful revascularization, favorable outcome, symptomatic hemorrhage, and mortality between the 2 groups. CONCLUSIONS Underlying intracranial atherosclerotic stenosis was not uncommon in patients with acute basilar artery occlusion. The occlusion segment of the basilar artery and the presence or absence of bilateral thalamic infarction on a pretreatment DWI might be helpful for predicting underlying intracranial atherosclerotic stenosis in patients with acute basilar artery occlusion. Patients with and without underlying intracranial atherosclerotic stenosis who underwent endovascular therapy had similar outcomes.
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Affiliation(s)
- Y Y Lee
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - W Yoon
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - S K Kim
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - B H Baek
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - G S Kim
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - J T Kim
- Neurology (J.T.K., M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - M S Park
- Neurology (J.T.K., M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
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Kumar A, Ong T, Simmonds L, Sahota O, Yoon W. 19VERTEBRAL AUGMENTATION FOR OSTEOPOROTIC VERTEBRAL FRACTURES IN THE ‘OLDER-OLD’ PERSON: EXPERIENCE FROM A TERTIARY UK SPINAL UNIT. Age Ageing 2017. [DOI: 10.1093/ageing/afx055.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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12
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Jang S, Jo A, Yoon W, Kook K. Stromal vascular fraction and adipose derived stem cells from chronic disease and obese patients can affect stem cell therapy. Cytotherapy 2017. [DOI: 10.1016/j.jcyt.2017.02.250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Yoon W. P17.05 Can re-irradiation for recurrent malignant gliomas be a good option? Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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14
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van Leest RH, Mulder P, Bauhuis GJ, Cheun H, Lee H, Yoon W, van der Heijden R, Bongers E, Vlieg E, Schermer JJ. Metal diffusion barriers for GaAs solar cells. Phys Chem Chem Phys 2017; 19:7607-7616. [DOI: 10.1039/c6cp08755h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Accelerated Ageing Testing (AAT) was used to assess the barrier potential of Ti, Ni, Pd and Pt. At a test temperature of 250 °C Ni offers the largest barrier potential. Based on TEM images and phase diagrams a barrier mechanism is proposed.
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Affiliation(s)
- R. H. van Leest
- Radboud University
- Institute for Molecules and Materials
- 6525 AJ Nijmegen
- The Netherlands
| | - P. Mulder
- Radboud University
- Institute for Molecules and Materials
- 6525 AJ Nijmegen
- The Netherlands
| | - G. J. Bauhuis
- Radboud University
- Institute for Molecules and Materials
- 6525 AJ Nijmegen
- The Netherlands
| | - H. Cheun
- LG Electronics Materials & Devices Advanced Research Institute
- Seoul 137-724
- Korea
| | - H. Lee
- LG Electronics Materials & Devices Advanced Research Institute
- Seoul 137-724
- Korea
| | - W. Yoon
- LG Electronics Materials & Devices Advanced Research Institute
- Seoul 137-724
- Korea
| | | | - E. Bongers
- Airbus Defence and Space Netherlands B.V
- 2333 CS Leiden
- The Netherlands
| | - E. Vlieg
- Radboud University
- Institute for Molecules and Materials
- 6525 AJ Nijmegen
- The Netherlands
| | - J. J. Schermer
- Radboud University
- Institute for Molecules and Materials
- 6525 AJ Nijmegen
- The Netherlands
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15
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Yoon W. E-076 Intravascular Ultrasonography for Cerebrovascular Intervention. J Neurointerv Surg 2016. [DOI: 10.1136/neurintsurg-2016-012589.148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Yoon W. E-060 Coil Embolization of Small and Wide Necked Intracranial Aneurysm with Temporary Stent Assisted Technique. J Neurointerv Surg 2016. [DOI: 10.1136/neurintsurg-2016-012589.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Jang S, Yoon W, Kook K. Long Term Cryopreservation of Stromal Vascular Fraction(SVF) and Isolation of SVF from Cryopreservation Fat: A Preclinical Application. Cytotherapy 2016. [DOI: 10.1016/j.jcyt.2016.03.242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kim GE, Yoon W, Kim SK, Kim BC, Heo TW, Baek BH, Lee YY, Yim NY. Incidence and Clinical Significance of Acute Reocclusion after Emergent Angioplasty or Stenting for Underlying Intracranial Stenosis in Patients with Acute Stroke. AJNR Am J Neuroradiol 2016; 37:1690-5. [PMID: 27079369 DOI: 10.3174/ajnr.a4770] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 02/09/2016] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE A major concern after emergent intracranial angioplasty in cases of acute stroke with underlying intracranial stenosis is the acute reocclusion of the treated arteries. This study reports the incidence and clinical outcomes of acute reocclusion of arteries following emergent intracranial angioplasty with or without stent placement for the management of patients with acute stroke with underlying intracranial atherosclerotic stenosis. MATERIALS AND METHODS Forty-six patients with acute stroke received emergent intracranial angioplasty with or without stent placement for intracranial atherosclerotic stenosis and underwent follow-up head CTA. Acute reocclusion was defined as "hypoattenuation" within an arterial segment with discrete discontinuation of the arterial contrast column, both proximal and distal to the hypoattenuated lesion, on CTA performed before discharge. Angioplasty was defined as "suboptimal" if a residual stenosis of ≥50% was detected on the postprocedural angiography. Clinical and radiologic data of patients with and without reocclusion were compared. RESULTS Of the 46 patients, 29 and 17 underwent angioplasty with and without stent placement, respectively. Acute reocclusion was observed in 6 patients (13%) and was more frequent among those with suboptimal angioplasty than among those without it (71.4% versus 2.6%, P < .001). The relative risk of acute reocclusion in patients with suboptimal angioplasty was 27.857 (95% confidence interval, 3.806-203.911). Furthermore, a good outcome was significantly less frequent in patients with acute reocclusion than in those without it (16.7% versus 67.5%, P = .028). CONCLUSIONS Acute reocclusion of treated arteries was common after emergent intracranial angioplasty with or without stent placement in patients with acute stroke with intracranial atherosclerotic stenosis and was associated with a poor outcome. Suboptimal results of angioplasty appear to be associated with acute reocclusion, irrespective of whether stent placement was performed.
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Affiliation(s)
- G E Kim
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
| | - W Yoon
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
| | - S K Kim
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
| | - B C Kim
- Neurology (B.C.K.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - T W Heo
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
| | - B H Baek
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
| | - Y Y Lee
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
| | - N Y Yim
- From the Departments of Radiology (G.E.K., W.Y., S.K.K., T.W.H., B.H.B., Y.Y.L., N.Y.Y.)
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van Leest RH, de Kleijne K, Bauhuis GJ, Mulder P, Cheun H, Lee H, Yoon W, van der Heijden R, Bongers E, Vlieg E, Schermer JJ. Degradation mechanism(s) of GaAs solar cells with Cu contacts. Phys Chem Chem Phys 2016; 18:10232-40. [PMID: 27020800 DOI: 10.1039/c6cp01428c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Substrate-based GaAs solar cells having a dense Au/Cu front contact grid with 45% surface coverage were exposed to accelerated life testing at temperatures between 200 and 300 °C. TEM analysis of the front contacts was used to gain a better understanding of the degradation process. During accelerated life testing at 200 °C only intermixing of the Au and Cu in the front contact occurs, without any significant influence on the J-V curve of the cells, even after 1320 h (55 days) of accelerated life testing. At temperatures ≥250 °C a recrystallization process occurs in which the metals of the contact and the GaAs front contact layer interact. Once the grainy recrystallized layer starts to approach the window, diffusion via grain boundaries to the window and into the active region of the solar cells occurs, causing a decrease in Voc due to enhanced non-radiative recombination via Cu trap levels introduced in the active region of the solar cell. To be a valid simulation of space conditions the accelerated life testing temperature should be <250 °C in future experiments, in order to avoid recrystallization of the metals with the GaAs contact layer.
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Affiliation(s)
- R H van Leest
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
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Kim SK, Yoon W, Park MS, Heo TW, Baek BH, Lee YY. Outcomes Are Not Different between Patients with Intermediate and High DWI-ASPECTS after Stent-Retriever Embolectomy for Acute Anterior Circulation Stroke. AJNR Am J Neuroradiol 2016; 37:1080-5. [PMID: 26767711 DOI: 10.3174/ajnr.a4663] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 11/23/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Questions remain as to what benefits embolectomy provides to patients presented with considerable early ischemic changes on baseline imaging studies. This study aimed to investigate the impact of the Alberta Stroke Program Early CT Score applied to DWI on treatment outcomes in patients with acute stroke undergoing stent-retriever embolectomy. MATERIALS AND METHODS We retrospectively analyzed the clinical and DWI data from 171 patients with acute anterior circulation stroke who were treated with stent-retriever embolectomy within 6 hours of symptom onset. DWI-ASPECTS scores were analyzed with the full scale or were dichotomized (4-6 versus 7-10). Patients with DWI-ASPECTS ≤3 were excluded from the study. Associations between outcome and clinical and radiologic factors were determined with a multivariate logistic regression analysis. A good outcome was defined as a modified Rankin Scale score of 0-2 at 3 months. RESULTS The median DWI-ASPECTS was 7 (interquartile range, 6-8). The rates of good outcome, symptomatic hemorrhage, and mortality were not different between high DWI-ASPECTS (scores of 7-10) and intermediate DWI-ASPECTS (scores of 4-6) groups. In patients with an intermediate DWI-ASPECTS, good outcome was achieved in 46.5% (20/43) of patients with successful revascularization, whereas no patients without successful revascularization had a good outcome (P = .016). In multivariate logistic regression analysis, independent predictors of good outcome were age and successful revascularization. CONCLUSIONS Our study suggested that there were no differences in outcomes between patients with a high DWI-ASPECTS and those with an intermediate DWI-ASPECTS who underwent stent-retriever embolectomy for acute anterior circulation stroke. Thus, patients with an intermediate DWI-ASPECTS otherwise eligible for endovascular therapy may not be excluded from stent-retriever embolectomy or stroke trials.
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Affiliation(s)
- S K Kim
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., B.H.B., Y.Y.L.)
| | - W Yoon
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., B.H.B., Y.Y.L.)
| | - M S Park
- Neurology (M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - T W Heo
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., B.H.B., Y.Y.L.)
| | - B H Baek
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., B.H.B., Y.Y.L.)
| | - Y Y Lee
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., B.H.B., Y.Y.L.)
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Kim Y, Park K, Chung P, Moon H, Suh B, Yoon W. Right-side propensity of cardiogenic emboli in acute ischemic stroke with atrial fibrillation. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.1374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Jung C, Yoon W, Ahn SJ, Choi BS, Kim JH, Suh SH. The Revascularization Scales Dilemma: Is It Right to Apply the Treatment in Cerebral Ischemia Scale in Posterior Circulation Stroke? AJNR Am J Neuroradiol 2015; 37:285-9. [PMID: 26381554 DOI: 10.3174/ajnr.a4529] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/22/2015] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND PURPOSE Although various revascularization scales are used in the angiographic evaluation of acute ischemic stroke, observer reliability tests of these scales have been rarely performed for posterior circulation stroke. We aimed to evaluate inter- and intraobserver variability of 2 scales, the modified Treatment in Cerebral Ischemia and the Arterial Occlusive Lesion, in posterior circulation stroke. MATERIALS AND METHODS Three independent readers interpreted pre- and postthrombolytic angiographies of 62 patients with posterior circulation stroke by using the modified Treatment in Cerebral Ischemia and Arterial Occlusive Lesion scales. The κ statistic was used to measure observer agreement for both scales, and κ > 0.6 was considered substantial agreement. RESULTS For the Arterial Occlusive Lesion scale, inter- and intraobserver agreement was >0.6. While intraobserver agreement of the modified Treatment in Cerebral Ischemia scale was >0.6 except for 1 reader, interobserver agreement was lower in dichotomized and original scales. In 49 cases with solely basilar artery occlusion, inter- and intraobserver agreement of both scales was similar to that in all 62 patients with posterior circulation stroke. In 2 consecutive readings, there was a significant decrease in the proportion of mTICI 2a reads (22.58% in the first versus 13.44% in the second session, P < .03) and a reciprocal increase in the sum of proportions for modified Treatment in Cerebral Ischemia 2b and modified Treatment in Cerebral Ischemia 3 reads (62.37% in the first versus 72.58% in the second session, P < .046). CONCLUSIONS In angiographic assessment of posterior circulation stroke, inter- and intraobserver agreement for the Arterial Occlusive Lesion scale was reliable, while the modified Treatment in Cerebral Ischemia failed to achieve substantial interobserver agreement. The clinical impact of this result needs to be validated in future studies.
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Affiliation(s)
- C Jung
- From the Department of Radiology (C.J., B.S.C., J.H.K.), Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - W Yoon
- Department of Radiology (W.Y.), Chonnam National University Medical School, Gwangju, Korea
| | - S J Ahn
- Department of Radiology (S.J.A., S.H.S.), Gangnam Severance Hospital, Yonsei University, Seoul, Korea
| | - B S Choi
- From the Department of Radiology (C.J., B.S.C., J.H.K.), Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - J H Kim
- From the Department of Radiology (C.J., B.S.C., J.H.K.), Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - S H Suh
- Department of Radiology (S.J.A., S.H.S.), Gangnam Severance Hospital, Yonsei University, Seoul, Korea Severance Institute of Vascular and Metabolic Research (S.H.S.), Yonsei University College of Medicine, Seoul, Korea.
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Kim SK, Yoon W, Kim TS, Kim HS, Heo TW, Park MS. Histologic Analysis of Retrieved Clots in Acute Ischemic Stroke: Correlation with Stroke Etiology and Gradient-Echo MRI. AJNR Am J Neuroradiol 2015; 36:1756-62. [PMID: 26159515 PMCID: PMC7968760 DOI: 10.3174/ajnr.a4402] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 02/06/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE It is unclear whether clot composition analysis is helpful to predict a stroke mechanism in acute large vessel occlusion. In addition, the relationship between early vessel signs on imaging studies and clot compositions has been poorly understood. The purpose of this study was to elucidate the relationship between clot composition and stroke etiology following mechanical thrombectomy and to investigate the effect of varied clot compositions on gradient-echo MR imaging of clots. MATERIALS AND METHODS Histopathologic analysis of retrieved clots from 37 patients with acute MCA occlusion was performed. Patients underwent gradient-echo imaging before endovascular therapy. Retrieved clots underwent semiquantitative proportion analysis to quantify red blood cells, fibrin, platelets, and white blood cells by area. Correlations between clot compositions and stroke subtypes and susceptibility vessel signs on gradient-echo imaging were assessed. RESULTS Stroke etiology was classified as cardioembolism in 22 patients (59.4%), large-artery atherosclerosis in 8 (21.6%), and undetermined in 7 (18.9%). The clots from cardioembolism had a significantly higher proportion of red blood cells (37.8% versus 16.9%, P = .031) and a lower proportion of fibrin (32.3% versus 48.5%, P = .044) compared with those from large-artery atherosclerosis. The proportion of red blood cells was significantly higher in clots with a susceptibility vessel sign than in those without it (48.0% versus 1.9%, P < .001), whereas the proportions of fibrin (26.4% versus 57.0%, P < .001) and platelets (22.6% versus 36.9%, P = .011) were significantly higher in clots without a susceptibility vessel sign than those with it. CONCLUSIONS The histologic composition of clots retrieved from cerebral arteries in patients with acute stroke differs between those with cardioembolism and large-artery atherosclerosis. In addition, a susceptibility vessel sign on gradient-echo imaging is strongly associated with a high proportion of red blood cells and a low proportion of fibrin and platelets in retrieved clots.
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Affiliation(s)
- S K Kim
- From the Departments of Radiology (S.K.K., W.Y., T.W.H.)
| | - W Yoon
- From the Departments of Radiology (S.K.K., W.Y., T.W.H.)
| | | | | | - T W Heo
- From the Departments of Radiology (S.K.K., W.Y., T.W.H.)
| | - M S Park
- Neurology (M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
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Kim C, Lee N, Yoon W, Chung Y, Lee N. PO-0796: Volumetric analysis of MRI response in meninigiomas treated with 3-dimensional conformal radiation therapy. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40788-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kim SK, Yoon W, Heo TW, Park MS, Kang HK. Negative Susceptibility Vessel Sign and Underlying Intracranial Atherosclerotic Stenosis in Acute Middle Cerebral Artery Occlusion. AJNR Am J Neuroradiol 2015; 36:1266-71. [PMID: 25814657 DOI: 10.3174/ajnr.a4280] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 01/14/2015] [Indexed: 12/15/2022]
Abstract
BACKGROUND AND PURPOSE The role of MR imaging in predicting underlying intracranial atherosclerotic stenosis before endovascular stroke therapy has not been studied. Our aim was to determine the diagnostic value of the negative susceptibility vessel sign on T2*-weighted gradient-echo MR imaging for predicting underlying intracranial atherosclerotic stenosis in patients with acute MCA occlusion. MATERIALS AND METHODS Ninety-one consecutive patients with acute stroke because of MCA occlusion underwent gradient-echo MR imaging and MRA before endovascular therapy. The negative susceptibility vessel sign was defined as an absence of a hypointense signal change within the occluded MCA on gradient-echo imaging. Underlying intracranial atherosclerotic stenosis was determined by conventional angiography. The sensitivity, specificity, predictive values, and accuracy of the negative susceptibility vessel sign for predicting the presence of underlying intracranial atherosclerotic stenosis were assessed. RESULTS The negative susceptibility vessel sign was identified in 42 (46.1%) of 91 patients, and 18 (19.8%) patients had an underlying intracranial atherosclerotic stenosis responsible for acute ischemic symptoms. The negative susceptibility vessel sign was more frequently observed in patients with intracranial atherosclerotic stenosis than in those without it (100% versus 32.9%, P < .001). In the prediction of an underlying intracranial atherosclerotic stenosis, the negative susceptibility vessel sign had 100% sensitivity, 67.1% specificity, 42.9% positive predictive value, 100% negative predictive value, and an accuracy of 73.6%. CONCLUSIONS The negative susceptibility vessel sign on gradient-echo MR imaging is a sensitive marker with a high negative predictive value for the presence of an underlying intracranial atherosclerotic stenosis in patients with acute ischemic stroke because of MCA occlusions. The susceptibility vessel sign can be used in decision-making when performing subsequent endovascular revascularization therapy in patients with acute MCA occlusions.
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Affiliation(s)
- S K Kim
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., H.K.K.)
| | - W Yoon
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., H.K.K.)
| | - T W Heo
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., H.K.K.)
| | - M S Park
- Neurology (M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - H K Kang
- From the Departments of Radiology (S.K.K., W.Y., T.W.H., H.K.K.)
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Zurlo KA, Yoon W, Kim H. Unsecured Consumer Debt and Mental Health Outcomes in Middle-Aged and Older Americans. J Gerontol B Psychol Sci Soc Sci 2014; 69:461-9. [DOI: 10.1093/geronb/gbu020] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Baek JM, Yoon W, Kim SK, Jung MY, Park MS, Kim JT, Kang HK. Acute basilar artery occlusion: outcome of mechanical thrombectomy with Solitaire stent within 8 hours of stroke onset. AJNR Am J Neuroradiol 2013; 35:989-93. [PMID: 24335542 DOI: 10.3174/ajnr.a3813] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Mechanical thrombectomy with a stent retriever applied shortly after symptom onset could increase good functional outcomes and improve survival in patients with acute basilar artery occlusion, but this has not yet been studied. This study evaluated the efficacy and safety of mechanical thrombectomy with a Solitaire stent within 8 hours of stroke onset in patients with acute basilar artery occlusion. MATERIALS AND METHODS We analyzed 25 consecutive patients with acute basilar artery occlusion who were treated with mechanical thrombectomy by use of the Solitaire stent within 8 hours of stroke symptom onset. Successful recanalization was defined as TICI grade 2b or 3. Good outcome was defined as mRS score of 0-2 at 3 months. Clinical and radiologic data in patients with good outcomes were compared with those with poor outcomes. RESULTS Successful recanalization was achieved in 96% (24/25) of patients, and 48% (12/25) of patients had good outcomes. Eighty-eight percent (22/25) of patients survived to 3 months. The median NIHSS score on admission was significantly lower in patients with good outcomes than in those with poor outcomes (9.5 versus 14, P = .005). Procedure-related complications occurred in 2 patients (8%). No symptomatic intracerebral hemorrhages occurred. CONCLUSIONS The current study suggests that mechanical thrombectomy by use of a Solitaire stent within 8 hours of stroke onset increases good outcomes and improves survival in patients with acute basilar artery occlusion.
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Affiliation(s)
- J M Baek
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - W Yoon
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - S K Kim
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - M Y Jung
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - M S Park
- Neurology (M.S.P., J.T.K.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - J T Kim
- Neurology (M.S.P., J.T.K.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - H K Kang
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
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Cao Y, Lee S, Chang K, Shim J, Lee J, Yang D, Park Y, Yoon W, Kim C. Optimization of Treatment Planning Parameters Used in Tomotherapy for Prostate Cancer: Using Dosimetric Physical Index and Plan Evaluation Scoring Index. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.1850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Chang K, Lee S, Shim J, Cao Y, Choi S, Jeong H, Yang D, Park Y, Yoon W, Kim C. Which Is an Optimal Dosimeter to New Optical CT Scanner (P3DS) Between BANGkit and PRESAGE? A Feasibility Study for Brain SRT Case. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.1867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wong J, Shah PS, Yoon W, Yee W, Lee SK, Dow K. Inotrope use Among Extremely Preterm Infants in Canadian Nicus : Variations and Outcomes. Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.34aa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Aziz K, Shah V, Lodha A, Andrews W, Dow K, Yoon W. Incidence and Risk Factors for Cranial Ultrasound Abnormalities in Canadian Nicus. Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.35ab] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Shah V, Parikh C, Yoon W, Alvaro R, Dunn M, Lee SK. Does the Time of Birth Impact on Neonatal Outcomes in Infants <33 Weeks GA? Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.38aa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Yoon W, Kang B, Park Y, Chae Y, Choung J, Yoo Y. Therapeutic Effects Of Recombinant Salmonella Typhimurium Expressing Ccl22 mirna On Atopic Dermatitis. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yoon W, Kim SK, Park MS, Chae HJ, Kang HK. Safety of protected carotid artery stenting in patients with severe carotid artery stenosis and carotid intraplaque hemorrhage. AJNR Am J Neuroradiol 2012; 33:1027-31. [PMID: 22241385 DOI: 10.3174/ajnr.a2911] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Carotid IPH can be detected with MR imaging. The aim of this study was to determine the safety of CAS using an emboli protection device in patients with severe carotid artery stenosis and MR imaging-depicted carotid IPH. MATERIALS AND METHODS We retrospectively reviewed a prospective data base that included 91 consecutive patients with severe carotid stenosis and high-risk features who were treated with CAS by using an emboli protection device. Seventy-eight of the included patients underwent prestenting 3D TOF MRA. IPH was defined as the presence of high signal intensity within the carotid plaque, greater than 150% of the signal intensity of the adjacent neck muscle on TOF source images. The primary outcome measure was the combined incidence of stroke, MI, and death within 30 days of CAS. Associations between IPH and the primary outcome were investigated. RESULTS IPH was detected on TOF MRA in 30 patients. Symptomatic patients were more common in the IPH group than in the non-IPH group (66.7% vs 41.7%; P = .032). Overall, 30-day stroke, MI, or death rates were 6.6%. There was no significant difference in the primary outcome between the IPH and non-IPH groups (10% and 6.25%, respectively; hazard ratio for IPH, 1.151; 95% CI, 0.035 to 37.500; P = .937). A logistic regression showed there was no independent variable associated with the primary outcome. CONCLUSIONS The results of this study indicate that protected CAS seems to be safe in patients with severe carotid stenosis and IPH.
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Affiliation(s)
- W Yoon
- Departments of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea.
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Chang K, Lee S, Lee C, Shim J, Cao Y, Lee S, Yoon W, Park Y, Yang D, Kim C. Development of Real-Time Couch-Based Tracking System (CBTS) For Image Guided Radiotherapy: A Feasibility Study. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mohamed A, Diambomba Y, Deshpande P, Yoon W, Martincevic I, Shah V. Does Approach of Weaning From Cpap Influence Neonatal Outcomes in Preterm Infants? Paediatr Child Health 2010. [DOI: 10.1093/pch/15.suppl_a.22a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Park DJ, Kim TJ, Lee HJ, Lee KE, Lee SJ, Seo SR, Yoon W, Moon KS, Lee KW, Lee SS, Park YW. De novo appearance of primitive neuroectodermal tumor in a patient with systemic lupus erythematosus and moyamoya disease. Lupus 2010; 19:989-92. [DOI: 10.1177/0961203310364399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Primitive neuroectodermal tumor is a rare brain tumor composed of undifferentiated or poorly differentiated neuroepithelial cells with a high malignant potential that usually occurs in children, and which is only occasionally encountered in adults. A 19-year-old female with systemic lupus erythematosus presented with right hemiparesis and a headache of 10 days duration. Brain magnetic resonance imaging showed a large solid mass with necrotic portions in the left frontoparietal lobe. Primitive neuroectodermal tumor was confirmed by a neuronavigator-guided brain biopsy. This is the first case report of primitive neuroectodermal tumor associated with systemic lupus erythematosus and moyamoya disease. This case demonstrates that brain tumors, such as primitive neuroectodermal tumor, should be included in the differential diagnosis of neurological manifestations in children and adolescent patients with systemic lupus erythematosus.
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Affiliation(s)
- DJ Park
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - TJ Kim
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - HJ Lee
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - KE Lee
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - SJ Lee
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - SR Seo
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - W. Yoon
- Department of Radiology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - KS Moon
- Department of Neurosurgery, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea
| | - KW Lee
- Department of Pathology, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea
| | - SS Lee
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - YW Park
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea,
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Yoon W, Park MS, Cho KH. Low-dose intra-arterial urokinase and aggressive mechanical clot disruption for acute ischemic stroke after failure of intravenous thrombolysis. AJNR Am J Neuroradiol 2010; 31:161-4. [PMID: 19713319 DOI: 10.3174/ajnr.a1746] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Intravenous (IV) thrombolysis often fails to achieve recanalization of occluded cerebral arteries, especially in patients with proximal large arterial occlusions. The goal of this study was to assess the feasibility, safety, and efficacy of low-dose intra-arterial (IA) urokinase and aggressive mechanical clot disruption (AMCD) after failure of IV thrombolysis for acute ischemic stroke. MATERIALS AND METHODS We prospectively enrolled 12 patients with acute ischemic stroke who initially received IV recombinant tissue plasminogen activator (rtPA) and were subsequently treated with combined low-dose IA urokinase and AMCD. Time to treatment, urokinase dose, duration of the procedure, recanalization rates, and symptomatic hemorrhage were analyzed. Clinical outcome measures were assessed on admission and at discharge (National Institutes of Health Stroke Scale [NIHSS]), and at 3 months after treatment (modified Rankin Scale [mRS]). RESULTS Median NIHSS score on admission was 17. Median time from symptom onset to IV rtPA was 120 minutes, and median time from symptom onset to IA therapy was 230 minutes. The median duration of IA therapy was 55 minutes. Median dose of urokinase was 300,000 U. Recanalization (thrombolysis in cerebral ischemia grade II or III) was achieved in all patients. No procedure-related complications were observed. There was no symptomatic hemorrhage. At discharge, median NIHSS score was 3. The 3-month outcome was excellent (mRS, 0-1) in 8 patients, good (mRS, 2) in 1 patient, and poor (mRS, 3-5) in 3 patients. There was no hospital or 3-month mortality. CONCLUSIONS In this study, combination therapy with low-dose IA urokinase and AMCD is safe and effective after failed IV thrombolysis in patients with acute ischemic stroke. A high rate of recanalization, low rate of symptomatic hemorrhage, and excellent functional outcome can be achieved.
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Affiliation(s)
- W Yoon
- Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, South Korea.
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Yoon W, Kim C, Yang D, Park Y, Park W, Ahn Y, Park H, Kim S, Kwon G. An In Vivo Study for the Effect of Triphala Against Radiation-induced Rectal Mucosal Damage. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kim JT, Heo SH, Lee SH, Choi SM, Park MS, Kim BC, Yoon W, Kim MK, Cho KH. An uncommon anastomosis of the posterior inferior cerebellar artery and the external carotid artery with the patent vertebrobasilar system. Br J Radiol 2009; 82:e171-4. [PMID: 19729545 DOI: 10.1259/bjr/73518980] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The hypoglossal artery arises as a branch of the internal carotid artery and traverses the hypoglossal canal. However, the hypoglossal artery arising from the external carotid artery (ECA) and connecting directly with the posterior inferior cerebellar artery (PICA), instead of the basilar artery or the vertebral artery, is very rare. We present a case of an uncommon variant of the hypoglossal artery arising from the ECA that connected directly with the PICA.
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Affiliation(s)
- J-T Kim
- Departments of Neurology Radiology, Chonnam National University Medical School, Gwangju 501-757, Korea
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Myung DS, Kim TJ, Lee SJ, Park SC, Kim JS, Kim JC, Yoon W, Lee SS, Park YW. Lupus-associated pancreatitis complicated by pancreatic pseudocyst and central nervous system vasculitis. Lupus 2009; 18:74-7. [PMID: 19074172 DOI: 10.1177/0961203308093462] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Pancreatitis is an uncommon manifestation of systemic lupus erythematosus (SLE), but this can occasionally cause major complications. We report in this article, a case of 33-year-old female patient who developed lupus-associated pancreatitis that was subsequently complicated by pancreatic pseudocyst and central nervous system (CNS) vasculitis. Abdominal computed tomography (CT) showed an oedematous swelling of the pancreas and a pseudocyst measuring 4 x 3 cm2. Brain magnetic resonance imaging (MRI) showed multiple high-signal intensity lesions in both cerebral hemispheres. The pseudocyst did not completely resolve with high-dose steroid therapy, and it was later complicated by infection and rupture. After a surgical drainage for the complicated pseudocyst, her clinical symptoms and signs were markedly improved. This case shows the importance of performing early drainage rather than conservative treatment for a pancreatic pseudocyst in a patient with lupus-associated pancreatitis.
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Affiliation(s)
- D S Myung
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
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Sarin P, Haggerty RP, Yoon W, Knapp M, Berghaeuser A, Zschack P, Karapetrova E, Yang N, Kriven WM. A curved image-plate detector system for high-resolution synchrotron X-ray diffraction. J Synchrotron Radiat 2009; 16:273-282. [PMID: 19240340 DOI: 10.1107/s0909049509001265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Accepted: 01/11/2009] [Indexed: 05/27/2023]
Abstract
The developed curved image plate (CIP) is a one-dimensional detector which simultaneously records high-resolution X-ray diffraction (XRD) patterns over a 38.7 degrees 2theta range. In addition, an on-site reader enables rapid extraction, transfer and storage of X-ray intensity information in </=30 s, and further qualifies this detector to study kinetic processes in materials science. The CIP detector can detect and store X-ray intensity information linearly proportional to the incident photon flux over a dynamical range of about five orders of magnitude. The linearity and uniformity of the CIP detector response is not compromised in the unsaturated regions of the image plate, regardless of saturation in another region. The speed of XRD data acquisition together with excellent resolution afforded by the CIP detector is unique and opens up wide possibilities in materials research accessible through X-ray diffraction. This article presents details of the basic features, operation and performance of the CIP detector along with some examples of applications, including high-temperature XRD.
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Affiliation(s)
- P Sarin
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA
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Abstract
Abstract Moyamoya disease is a rare, progressive cerebrovascular disorder that is characterized by a stenosis or occlusion of the bilateral internal carotid arteries and the development of collateral vessels. Transient ischemic attacks or seizures are the usual presentation of moyamoya disease in children, whereas cerebral hemorrhage is the most common symptom in adults. We report an 18-year-old female patient with active lupus nephritis who presented with the sudden onset of left hemiparesis. Brain magnetic resonance imaging showed acute infarctions in the right basal ganglia and subcortical white matter of the right frontal lobe. Cerebral angiography showed the stenosis of the bilateral internal carotid arteries with rich basal collateral vessels (moyamoya vessels). There was no evidence of atherosclerosis or antiphospholipid syndrome. Glucocorticoid therapy was used to control the systemic lupus erythematosus. Prophylactic bypass surgery was performed to prevent recurrent ischemic attacks. This case report shows that an underlying cerebrovascular lesion of moyamoya vessels in a patient with systemic lupus erythematosus is susceptible to cerebrovascular accidents.
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Affiliation(s)
- HC Jeong
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - YJ Kim
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - W Yoon
- Department of Radiology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - SP Joo
- Department of Neurosurgery, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - SS Lee
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea
| | - YW Park
- Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Republic of Korea,
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Jeong HK, Lee KJ, Yoon W, Lee SS, Park YW. Unusual presentation of gouty spondylitis following antituberculosis therapy. Clin Exp Rheumatol 2008; 26:507. [PMID: 18578980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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Suh D, Yoon W, Shibahara M, Jung S. Molecular dynamics analysis of multiple site growth and coalescence effects on homogeneous and heterogeneous nucleations. J Chem Phys 2008; 128:154523. [DOI: 10.1063/1.2904459] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Yoon SJ, Yoon W, Kim OS, Lee JS, Kang BC. Diagnostic accuracy of panoramic radiography in the detection of calcified carotid artery. Dentomaxillofac Radiol 2008; 37:104-8. [PMID: 18239037 DOI: 10.1259/dmfr/86909790] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES The purpose of this study was to assess the diagnostic accuracy of the panoramic radiograph in the detection of carotid artery calcification using CT as the gold standard. METHODS 110 dental patients (average age 65.2 years, range 50-82 years) with both panoramic radiographs and CT scans available were selected for the evaluation of carotid artery calcification. Two oral and maxillofacial radiologists interpreted the panoramic radiographs for the presence of carotid artery calcification. CT scans were independently interpreted by a neuroradiologist. RESULTS The accuracy of panoramic radiographs in the detection of carotid artery calcification was 62.3%. The sensitivity and the specificity were 22.2% and 90.0%, respectively. CONCLUSIONS Panoramic radiography has a moderate diagnostic accuracy in the detection of carotid artery calcification, but the sensitivity is low.
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Affiliation(s)
- S-J Yoon
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Chonnam National University, Donggu Hakdong 5, Gwangju, 501-757, Korea.
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Kim TS, Joo SP, Lee JK, Jung S, Kim JH, Kim SH, Kang SS, Yoon W. Neuronavigation-Assisted Surgery for Distal Anterior Cerebral Artery Aneurysm. ACTA ACUST UNITED AC 2007; 50:140-4. [PMID: 17882748 DOI: 10.1055/s-2007-985151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE We present our experience with the neuronavigation system as used for surgery of distal anterior cerebral artery (DACA) aneurysm. METHODS Between 2001 and 2004, 12 patients with a DACA aneurysm were consecutively treated with direct clipping assisted by the neuronavigation system. We used the BrainLAB Vector Vision neuronavigation system (BrainLAB, Heimstetten, Germany). Seven out of 12 patients presented with subarachnoid hemorrhage. Aneurysms were located at distal A2 in 10 patients and distal A3 in two patients. The size of the aneurysms ranged from 3-10 mm. RESULTS There were no procedure-related complications or technical problems during application of the neuronavigation system. The registration accuracy ranged from 0.5-1.5 mm (mean: 0.88 mm). The neuronavigation system provided real-time presentation of the DACA and the aneurysm, and allowed for identification of the DACA aneurysm in all patients. No surgical complications developed, and all 12 patients had a good recovery after direct clipping. CONCLUSION Although current neuronavigation systems are not available for all intracranial aneurysms, we believe that the DACA aneurysm is a good candidate for its use. The additional benefits of a small craniotomy and precise intraoperative orientation during surgery result in a minimally invasive aneurysm procedure.
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Affiliation(s)
- T S Kim
- Department of Neurosurgery, Chonnam National University Medical School, Gwangju, Korea.
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Kim TS, Joo SP, Lee JK, Jung S, Kim JH, Kim SH, Kang SS, Yoon W. Neuronavigation-Assisted Surgery for Distal Anterior Cerebral Artery Aneurysm. ACTA ACUST UNITED AC 2007; 50:77-81. [PMID: 17674292 DOI: 10.1055/s-2007-984380] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE We present our experience with the neuronavigation system used for surgery of distal anterior cerebral artery (DACA) aneurysms. METHODS Between 2001 and 2004, 12 patients with a DACA aneurysm were consecutively treated with direct clipping assisted by the neuronavigation system. We used the BrainLAB Vector Vision2 neuronavigation system (BrainLAB, Heimstetten, Germany). Seven out of 12 patients presented with subarachnoid hemorrhage. Aneurysms were located at distal A2 in 10 patients and distal A3 in two patients. The size of the aneurysms ranged from 3 to 10 mm. RESULTS There were no procedure-related complications or technical problems during application of the neuronavigation system. The registration accuracy ranged from 0.5 to 1.5 mm (mean: 0.88). The neuronavigation system provided real-time presentation of the DACA aneurysm, and allowed for identification of the DACA aneurysm in all patients. No surgical complications developed, and all 12 patients had a good recovery after direct clipping. CONCLUSION Although current neuronavigation systems are not available for all intracranial aneurysms, we believe that the DACA aneurysm is a good candidate for its use. The additional benefits of a small craniotomy and precise intraoperative orientation during surgery result in a minimally invasive aneurysm procedure.
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Affiliation(s)
- T S Kim
- Department of Neurosurgery, Chonnam National University Medical School, Gwangju, Korea.
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Yeo S, Cho M, Yoon W, Song K, Nam J, Kim K, Kim J. 2130. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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