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https://www.readbyqxmd.com/read/28094849/the-collimator-monitoring-fill-factor-of-a-two-dimensional-detector-array-a-measure-of-its-ability-to-detect-collimation-errors
#1
Tenzin Sonam Stelljes, Hui Khee Looe, Dietrich Harder, Björn Poppe
PURPOSE: Two-dimensional detector arrays are routinely used for constancy checks and treatment plan verification in photon-beam radiotherapy. In addition to the spatial resolution of the dose profiles, the "coverage" of the radiation field with respect to the detection of any beam collimation deficiency appears as the second characteristic feature of a detector array. The here proposed "collimator monitoring fill factor" (CM fill factor) has been conceived to serve as a quantitative characteristic of this "coverage"...
January 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28093718/ribosomal-protein-s3-gene-silencing-protects-against-experimental-allergic-asthma
#2
Jinrui Dong, Wupeng Liao, Hong Yong Peh, Tze Khee Chan, W S Daniel Tan, Li Li, Amy Yong, W S Fred Wong
BACKGROUND AND PURPOSE: Ribosomal protein S3 (RPS3) is a 40S ribosomal protein of the S3P family essential for executing protein translation. RPS3 has recently been found to interact with the p65 subunit of the NF-κB complex, and promote p65 DNA-binding activity. Persistent activation of the NF-κB pathway is evident in allergic asthma. We hypothesized that gene silencing of lung RPS3 can ameliorate allergic airway inflammation. EXPERIMENTAL APPROACH: Gene silencing efficacy of RPS3 siRNA was screened in three different mouse cell lines by real-time PCR and immunoblotting...
January 17, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28065414/high-level-ambient-particulate-matter-before-influenza-attack-with-increased-incidence-of-aspergillus-antigenemia-in-southern-taiwan-2016
#3
Wen-Liang Yu, Wei-Lun Liu, Khee-Siang Chan, Chun-Chieh Yang, Che-Kim Tan, Chi-Lun Tsai, Chin-Ming Chen, Yin-Ching Chuang
We found significant correlation between the incidence of severe influenza and Aspergillus antigenemia among medical intensive care unit patients for 7-month observation (coefficient γ=0.976, p<0.001). High-level ambient pollution was noticed for 2 months before the epidemic, highlighting that influenza patients might coinfect with aspergillosis in the community.
December 18, 2016: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28039012/personalized-glucose-insulin-model-based-on-signal-analysis
#4
Simon L Goede, Bastiaan E de Galan, Melvin Khee Shing Leow
Glucose plasma measurements for diabetes patients are generally presented as a glucose concentration-time profile with 15-60min time scale intervals. This limited resolution obscures detailed dynamic events of glucose appearance and metabolism. Measurement intervals of 15minutes or more could contribute to imperfections in present diabetes treatment. High resolution data from mixed meal tolerance tests (MMTT) for 24 type 1 and type 2 diabetes patients were used in our present modelling. We introduce a model based on the physiological properties of transport, storage and utilization...
December 27, 2016: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28035037/evaluation-of-a-care-transition-program-with-pharmacist-provided-home-based-medication-review-for-elderly-singaporeans-at-high-risk-of-readmissions
#5
McVin Hua Heng Cheen, Chong Ping Goon, Wan Chee Ong, Paik Shia Lim, Choon Nam Wan, Mei Yan Leong, Giat Yeng Khee
OBJECTIVE: This study aimed to determine whether pharmacist-provided home-based medication review (HBMR) can reduce readmissions in the elderly. DESIGN: Retrospective cohort study. SETTING: Patient's home. PARTICIPANTS: Records of patients referred to a care transition program from March 2011 through March 2015 were reviewed. Patients aged 60 years and older taking more than 5 medications and had at least 2 unplanned admissions within 3 months preceding the first home visit were included...
December 29, 2016: International Journal for Quality in Health Care
https://www.readbyqxmd.com/read/27992384/the-energy-dependence-of-the-lateral-dose-response-functions-of-detectors-with-various-densities-in-photon-beam-dosimetry
#6
Hui Khee Looe, Dietrich Harder, Björn Poppe
The lateral dose response function is a general characteristic of the volume effect of a detector used for photon dosimetry in a water phantom. It serves as the convolution kernel transforming the true absorbed dose to water profile, which would be produced within the undisturbed water phantom, into the detector-measured signal profile. The shape of the lateral dose response function characterizes (i) the volume averaging attributable to the detector's size and (ii) the disturbance of the secondary electron field associated with the deviation of the electron density of the detector material from the surrounding water...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27979608/early-mobilization-reduces-duration-of-mechanical-ventilation-and-intensive-care-unit-stay-in-patients-in-acute-respiratory-failure
#7
Chih-Cheng Lai, Willy Chou, Khee-Siang Chan, Kuo-Chen Cheng, Kuo-Shu Yuan, Chien-Ming Chao, Chin-Ming Chen
OBJECTIVES: To evaluate the effects of a quality improvement program to introduce early mobilization on the outcome of mechanical ventilation (MV) patients in the Intensive Care Unit (ICU). DESIGN: A retrospective observational study SETTING: 19-beds ICU at a medical center PARTICIPANTS: All adults MV patients admitted a medical ICU INTERVENTION: A multidisciplinary team (critical care nurse, nursing assistant, respiratory therapist, physical therapist, and patients' family) initiated the protocol within 72 hours of MV, when patients become hemodynamically stable...
December 12, 2016: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27902388/the-exploration-of-risk-factors-of-concurrent-bacteraemia-in-patients-critically-ill-with-severe-dengue
#8
Chin-Ming Chen, Khee-Siang Chan, Kuo-Chen Cheng, Willy Chou, Hui-Chun Chao, Chiu-Yin Yeh, Wen-Liang Yu
We investigated the clinical features of intensive care unit (ICU) patients with concomitant severe dengue infection and bacteraemia to identify risk factors for this comorbidity. The records of all ICU dengue patients admitted during the period of 31 July-30 November 2015 were reviewed. Patients with 'concurrent bacteremia' (positive bacterial blood culture within 72 h of ICU admission) were identified. ICU admission was required for 142 patients, of which 22 (15.5 %) had concurrent bacteraemia. Species of the genus Streptococcus was the most common pathogens, followed by Escherichia coli then species of the genus Staphylococcus...
December 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27879037/nanomembrane-based-thermal-transport-biosensor-for-living-cells
#9
Rami T ElAfandy, Ayman F AbuElela, Pawan Mishra, Bilal Janjua, Hassan M Oubei, Ulrich Büttner, Mohammed A Majid, Tien Khee Ng, Jasmeen S Merzaban, Boon S Ooi
Knowledge of materials' thermal-transport properties, conductivity and diffusivity, is crucial for several applications within areas of biology, material science and engineering. Specifically, a microsized, flexible, biologically integrated thermal transport sensor is beneficial to a plethora of applications, ranging across plants physiological ecology and thermal imaging and treatment of cancerous cells, to thermal dissipation in flexible semiconductors and thermoelectrics. Living cells pose extra challenges, due to their small volumes and irregular curvilinear shapes...
November 23, 2016: Small
https://www.readbyqxmd.com/read/27869363/is-the-memorial-sloan-kettering-cancer-centre-mskcc-sarcoma-nomogram-useful-in-an-asian-population
#10
Deanna Wan Jie Ng, Grace Hwei Ching Tan, Claramae Shulyn Chia, Cindy Xindi Lim, Soo Khee Chee, Richard Hong Hui Quek, Mohamad Farid, Melissa Ching Ching Teo
AIM: A nomogram for prediction of 12-year sarcoma-specific survival has been developed based on patients with soft tissue sarcomas treated in Memorial Sloan Kettering Cancer Centre (MSKCC). We aim to evaluate the predictive accuracy of the MSKCC sarcoma nomogram in a cohort of patients treated at an Asian institution. This has not been validated in an Asian population and thus its universal applicability remains unproven. MATERIALS AND METHODS: Between 1990 and 2013, 840 adult patients underwent treatment for primary soft tissue sarcoma (STS) at the National Cancer Centre Singapore...
November 21, 2016: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/27866377/unusual-cause-of-hypercalcaemia-in-end-stage-renal-failure-patients
#11
Hooi Khee Teo, Jiunn Wong
Immobility-induced hypercalcaemia is rarely considered in patients on dialysis and is a challenging diagnosis to make. This is especially so due to the lack of biomarkers as well as the notion that calcium metabolism is mostly related to chronic kidney disease-metabolic bone disorder due to the role of iPTH. We present two cases of our dialysis patients, who were clinically unwell from hypercalcemia. We were initially uncertain of the cause of hypercalcemia as despite our attempts to adjust treatment based on their biochemical findings, we were unable to correct the hypercalcemia...
November 20, 2016: Hemodialysis International
https://www.readbyqxmd.com/read/27855557/201-consecutive-cytoreductive-surgery-crs-and-hyperthermic-intraperitoneal-chemotherapy-hipec-procedures-in-a-single-asian-tertiary-centre
#12
Grace Tan, Claramae Chia, Mrinal Kumar, Su Pin Choo, John Chia, Chee Kian Tham, Clarinda Chua, Khee Chee Soo, Melissa Teo
INTRODUCTION: Peritoneal carcinomatosis (PC) is increasingly being treated with cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC). We provide a review of a high-volume Asian institute's experience and survival outcomes with this procedure. METHODS: Data were prospectively collected from 201 consecutive CRS and HIPEC procedures performed in a single institution between April 2001 and November 2015. Our primary endpoints were overall survival (OS) and disease-free survival (DFS), and secondary endpoints were morbidity and mortality...
December 14, 2016: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/27832924/nasopharyngectomy-with-operating-microscope-a-case-series
#13
Jia Hui Jang, Hiang Khoon Tan, N Gopalakrishna Iyer, Khee Chee Soo, Ngian Chye Tan
BACKGROUND: Nasopharyngectomy for excision of nasopharyngeal tumors is challenging, as access to the nasopharynx is difficult. Recently our institution embarked on two new approaches - robotic nasopharyngectomy and open nasopharyngectomy with operating microscope (NOM) via maxillary swing approach. This article proposes that the novel approach of NOM via maxillary swing aids visualization for resection of locally invasive nasopharyngeal tumors. METHODS: Over a thirteen-month period, eight patients required nasopharyngectomy in our single Asian institution...
January 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/27828488/20-meter-underwater-wireless-optical-communication-link-with-1-5-gbps-data-rate
#14
Chao Shen, Yujian Guo, Hassan M Oubei, Tien Khee Ng, Guangyu Liu, Ki-Hong Park, Kang-Ting Ho, Mohamed-Slim Alouini, Boon S Ooi
The video streaming, data transmission, and remote control in underwater call for high speed (Gbps) communication link with a long channel length (~10 meters). We present a compact and low power consumption underwater wireless optical communication (UWOC) system utilizing a 450-nm laser diode (LD) and a Si avalanche photodetector. With the LD operating at a driving current of 80 mA with an optical power of 51.3 mW, we demonstrated a high-speed UWOC link offering a data rate up to 2 Gbps over a 12-meter-long, and 1...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27821083/single-administration-of-selective-internal-radiation-therapy-versus-continuous-treatment-with-sorafenib-in-locally-advanced-hepatocellular-carcinoma-sirvenib-study-protocol-for-a-phase-iii-randomized-controlled-trial
#15
Mihir Gandhi, Su Pin Choo, Choon Hua Thng, Say Beng Tan, Albert Su Chong Low, Peng Chung Cheow, Anthony Soon Whatt Goh, Kiang Hiong Tay, Richard Hoau Gong Lo, Brian Kim Poh Goh, Jen San Wong, David Chee Eng Ng, Khee Chee Soo, Wei Ming Liew, Pierce K H Chow
BACKGROUND: Approximately 20 % of hepatocellular carcinoma (HCC) patients diagnosed in the early stages may benefit from potentially curative ablative therapies such as surgical resection, transplantation or radiofrequency ablation. For patients not eligible for such options, prognosis is poor. Sorafenib and Selective Internal Radiation Therapy (SIRT) are clinically proven treatment options in patients with unresectable HCC, and this study aims to assess overall survival following either SIRT or Sorafenib therapy for locally advanced HCC patients...
November 7, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27748410/prognosis-of-alcohol-associated-lactic-acidosis-in-critically-ill-patients-an-8-year-study
#16
Chun-Chieh Yang, Khee-Siang Chan, Kuei-Ling Tseng, Shih-Feng Weng
Lactic acidosis is common in critical care; by contrast, a subtype called alcohol-associated lactic acidosis (AALA) is rarely encountered. The primary purpose of this study was to determine the prognosis of AALA in critically ill patients and the second aim was to determine whether the survival was associated to the peak blood lactate concentration. An 8-year retrospective analysis of adult patients admitted to the intensive care unit (ICU) with AALA between January 2007 and December 2014 was considered in a tertiary care hospital...
October 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27708483/glycated-hemoglobin-hba1c-clinical-applications-of-a-mathematical-concept
#17
Melvin Khee Shing Leow
BACKGROUND AND PURPOSE: Glycated hemoglobin (HbA1c) reflects the cumulative glucose exposure of erythrocytes over a preceding time frame proportional to erythrocyte survival. HbA1c is thus an areal function of the glucose-time curve, an educationally useful concept to aid teaching and clinical judgment. METHODS: An ordinary differential equation is formulated as a parsimonious model of HbA1c. The integrated form yields HbA1c as an area-under-the-curve (AUC) of a glucose-time profile...
July 16, 2016: Acta Informatica Medica: AIM
https://www.readbyqxmd.com/read/27687746/unresectability-during-open-surgical-exploration-in-planned-cytoreductive-surgery-and-hyperthermic-intraperitoneal-chemotherapy
#18
Zachary Zihui Yong, Grace Hwei Ching Tan, Joelle Fui Sze Wong, Cindy Lim, Khee Chee Soo, Melissa Ching Ching Teo
BACKGROUND: Cytoreductive surgery and hyperthermic intraperitoneal chemotherapy are the treatment of choice for selected patients with peritoneal metastasis. Despite a stringent selection process, some patients were found to be unresectable only at surgery, which leads to disappointment and poor utilisation of limited infrastructural resources. This study aims to determine the pre-operative factors associated with unresectability in planned CRS and HIPEC. METHODS: Retrospective analysis of 172 consecutive patients eligible for CRS and HIPEC at the National Cancer Centre Singapore from April 2004 to May 2014 was performed...
December 2016: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/27677335/epigenomic-profiling-of-primary-gastric-adenocarcinoma-reveals-super-enhancer-heterogeneity
#19
Wen Fong Ooi, Manjie Xing, Chang Xu, Xiaosai Yao, Muhammad Khairul Ramlee, Mei Chee Lim, Fan Cao, Kevin Lim, Deepak Babu, Lai-Fong Poon, Joyce Lin Suling, Aditi Qamra, Astrid Irwanto, James Qu Zhengzhong, Tannistha Nandi, Ai Ping Lee-Lim, Yang Sun Chan, Su Ting Tay, Ming Hui Lee, James O J Davies, Wai Keong Wong, Khee Chee Soo, Weng Hoong Chan, Hock Soo Ong, Pierce Chow, Chow Yin Wong, Sun Young Rha, Jianjun Liu, Axel M Hillmer, Jim R Hughes, Steve Rozen, Bin Tean Teh, Melissa Jane Fullwood, Shang Li, Patrick Tan
Regulatory enhancer elements in solid tumours remain poorly characterized. Here we apply micro-scale chromatin profiling to survey the distal enhancer landscape of primary gastric adenocarcinoma (GC), a leading cause of global cancer mortality. Integrating 110 epigenomic profiles from primary GCs, normal gastric tissues and cell lines, we highlight 36,973 predicted enhancers and 3,759 predicted super-enhancers respectively. Cell-line-defined super-enhancers can be subclassified by their somatic alteration status into somatic gain, loss and unaltered categories, each displaying distinct epigenetic, transcriptional and pathway enrichments...
September 28, 2016: Nature Communications
https://www.readbyqxmd.com/read/27659906/growth-and-development-of-arabidopsis-thaliana-under-single-wavelength-red-and-blue-laser-light
#20
Amanda Ooi, Aloysius Wong, Tien Khee Ng, Claudius Marondedze, Christoph Gehring, Boon S Ooi
Indoor horticulture offers a sensible solution for sustainable food production and is becoming increasingly widespread. However, it incurs high energy and cost due to the use of artificial lighting such as high-pressure sodium lamps, fluorescent light or increasingly, the light-emitting diodes (LEDs). The energy efficiency and light quality of currently available horticultural lighting is suboptimal, and therefore less than ideal for sustainable and cost-effective large-scale plant production. Here, we demonstrate the use of high-powered single-wavelength lasers for indoor horticulture...
September 23, 2016: Scientific Reports
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