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https://www.readbyqxmd.com/read/28087972/lack-of-effect-of-oral-cabotegravir-on-the-pharmacokinetics-of-a-levonorgestrel-ethinyl-estradiol-containing-oral-contraceptive-in-healthy-adult-females
#1
C Trezza, S L Ford, E Gould, Y Lou, C Huang, J M Ritter, A M Buchanan, W Spreen, P Patel
AIM(S): This study aimed to investigate whether cabotegravir (CAB), an integrase inhibitor in development for treatment and prevention of HIV-1, influences the pharmacokinetics (PK) of a levonorgestrel (LNG) and ethinyl estradiol (EE)-containing oral contraceptive (OC) in healthy women. METHODS: In this open-label, fixed-sequence crossover study, healthy female subjects received LNG 0.15 mg/EE 0.03 mg tablet once daily Days 1-10 alone and with oral CAB 30 mg once daily Days 11-21...
January 14, 2017: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28079526/a-measurement-based-generalized-source-model-for-monte-carlo-dose-simulations-of-ct-scans
#2
Xin Ming, Yuanming Feng, Ransheng Liu, Chengwen Yang, Li Zhou, Hezheng Zhai, Jun Deng
The goal of this study is to present a generalized source model (GSM) for accurate Monte Carlo dose simulations of CT scans based solely on the measurement data without a priori knowledge of scanner specifications. The proposed generalized source model consists of an extended circular source located at x-ray target level with its energy spectrum, source distribution and fluence distribution derived from a set of measurement data conveniently available in the clinic. Specifically, the central axis percent depth dose (PDD) curves measured in water and the cone output factors measured in air were used to derive the energy spectrum and the source distribution respectively with a Levenberg-Marquardt algorithm...
January 12, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28079517/pharmacokinetic-and-bioequivalence-study-comparing-a-candesartan-cilexetil-rosuvastatin-calcium-fixed-dose-combination-with-the-concomitant-administration-of-candesartan-cilexetil-and-rosuvastatin-calcium-in-healthy-korean-subjects%C3%A2
#3
Dan-Bee Park, Kyungho Jang, Jae-Won Lee, Cheol-Won Park, Back-Hwan Lee, Min-Gul Kim, Ji-Young Jeon
CONTEXT: A fixed-dose combination (FDC) of candesartan and rosuvastatin was recently developed for the treatment of cardiovascular disease and expected to enhance patient compliance. OBJECTIVE: This study was performed to compare the single-dose pharmacokinetic properties and tolerability of DP-R208 (candesartan and rosuvastatin FDC) to those of each component administered alone in healthy Korean male volunteers. MATERIALS AND METHODS: A total of 40 healthy Korean volunteers were enrolled in this randomized, open-label, single-dose, two-treatment, two-way crossover study...
January 12, 2017: International Journal of Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28078600/net-budgetary-impact-of-ferric-citrate-as-a-first-line-phosphate-binder-for-the-treatment-of-hyperphosphatemia-a-markov-microsimulation-model
#4
Steven M Brunelli, Scott P Sibbel, David Van Wyck, Amit Sharma, Andrew Hsieh, Glenn M Chertow
Ferric citrate (FC) has demonstrated efficacy as a phosphate binder and reduces the requirements for erythropoiesis-stimulating agents (ESAs) and intravenous (IV) iron in dialysis patients. We developed a net budgetary impact model to evaluate FC vs. other phosphate binders from the vantage of a large dialysis provider. We used a Markov microsimulation model to simulate mutually referential longitudinal effects between serum phosphate and phosphate binder dose; categories of these defined health states. Health states probabilistically determined treatment attendance and utilization of ESA and IV iron...
January 11, 2017: Drugs in R&D
https://www.readbyqxmd.com/read/28077138/fish-intake-and-the-risk-of-brain-tumor-a-meta-analysis-with-systematic-review
#5
REVIEW
Wei Lian, Renzhi Wang, Bing Xing, Yong Yao
BACKGROUND: Fish, rich in ω-3 polyunsaturated fatty acids, has been found to be associated with lower risk of several types of cancer risk, and beneficial for brain development. However, the association between fish intake and brain tumor risk is still inconsistent. Therefore, we conducted a meta-analysis to clarify the association. METHODS: Relevant studies were identified from PubMed and EMBASE databases. The pooled relative risks were obtained by the fixed-effects model when no substantial heterogeneity was observed...
January 11, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28076338/quantification-of-confounding-factors-in-mri-based-dose-calculations-as-applied-to-prostate-imrt
#6
Matteo Maspero, Peter R Seevinck, Gerald Schubert, Michaela A U Hoesl, Bram van Asselen, Max A Viergever, Jan J W Lagendijk, Gert J Meijer, Cornelis A T van den Berg
Magnetic resonance (MR)-only radiotherapy treatment planning requires pseudo-CT (pCT) images to enable MR-based dose calculations. To verify the accuracy of MR-based dose calculations, institutions interested in introducing MR-only planning will have to compare pCT-based and computer tomography (CT)-based dose calculations. However, interpreting such comparison studies may be challenging, since potential differences arise from a range of confounding factors which are not necessarily specific to MR-only planning...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28076336/a-theoretical-framework-to-predict-the-most-likely-ion-path-in-particle-imaging
#7
Charles-Antoine Collins-Fekete, Lennart Volz, Stephen Portillo, Luc Beaulieu, Joao Seco
In this work, a generic rigorous Bayesian formalism is introduced to predict the most likely path of any ion crossing a medium between two detection points. The path is predicted based on a combination of the particle scattering in the material and measurements of its initial and final position, direction and energy. The path estimate's precision is compared to the Monte Carlo simulated path. Every ion from hydrogen to carbon is simulated in two scenarios, 1) where the range is fixed and 2) where the initial velocity is fixed...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28075335/towards-standardization-of-x-ray-beam-filters-in-digital-mammography-and-digital-breast-tomosynthesis-monte-carlo-simulations-and-analytical-modelling
#8
Suman Shrestha, Srinivasan Vedantham, Andrew Karellas
In digital breast tomosynthesis and digital mammography, the x-ray beam filter material and thickness vary between systems. Replacing K-edge filters with Al was investigated with the intent to reduce exposure duration and to simplify system design. Tungsten target x-ray spectra were simulated with K-edge filters (50��m Rh; 50��m Ag) and Al filters of varying thickness. Monte Carlo simulations were conducted to quantify the x-ray scatter from various filters alone, scatter-to-primary ratio (SPR) with compressed breasts, and to determine the radiation dose to the breast...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28075066/efficacy-and-safety-of-fixed-dose-combination-therapy-alogliptin-plus-metformin-in-asian-patients-with-type-2-diabetes-a-phase-3-trial
#9
Linong Ji, Ling Li, Jian Kuang, Tao Yang, Dong-Jun Kim, Azidah Abdul Kadir, Chien-Ning Huang, Douglas Lee
This study evaluated the efficacy and safety of 26 weeks of twice-daily (BID) alogliptin + metformin fixed-dose combination (FDC) therapy in Asian patients with type 2 diabetes. Patients aged 18 - 75 years with hemoglobin A1c (HbA1c) 7.5 - 10.0% after ≥2 months of diet and exercise and a 4-week placebo run-in were enrolled. Eligible patients were randomized (1:1:1:1) to placebo, alogliptin 12.5 mg BID, metformin 500 mg BID, or alogliptin 12.5 mg plus metformin 500 mg FDC BID. The primary endpoint was change in HbA1c from baseline to end of treatment (Week 26)...
January 11, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28074265/pharmacokinetic-and-exposure-response-analyses-of-pertuzumab-in-combination-with-trastuzumab-and-docetaxel-during-neoadjuvant-treatment-of-her2-%C3%A2-early-breast-cancer
#10
Angelica L Quartino, Hanbin Li, Jin Y Jin, D Russell Wada, Mark C Benyunes, Virginia McNally, Lucia Viganò, Ihsan Nijem, Bert L Lum, Amit Garg
PURPOSE: The NeoSphere trial evaluated pertuzumab in the neoadjuvant setting [early breast cancer (EBC)] with pathological complete response (pCR) as the primary efficacy end point. This analysis of pertuzumab aimed to (1) compare its pharmacokinetics (PK) in patients with EBC versus advanced cancers, (2) to further evaluate PK drug-drug interactions (DDIs) when given in combination with trastuzumab, and (3) to assess the relationship between exposure and efficacy to assess the clinical dosing regimen in the EBC patients...
January 10, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28074019/point-organ-radiation-dose-in-abdominal-ct-effect-of-patient-off-centering-in-an-experimental-human-cadaver-study
#11
Ranish Deedar Ali Khawaja, Sarabjeet Singh, Atul Padole, Alexi Otrakji, Diego Lira, Da Zhang, Bob Liu, Andrew Primak, George Xu, Mannudeep K Kalra
To determine the effect of patient off-centering on point organ radiation dose measurements in a human cadaver scanned with routine abdominal CT protocol. A human cadaver (88 years, body-mass-index 20 kg/m(2)) was scanned with routine abdominal CT protocol on 128-slice dual source MDCT (Definition Flash, Siemens). A total of 18 scans were performed using two scan protocols (a) 120 kV-200 mAs fixed-mA (CTDIvol 14 mGy) (b) 120 kV-125 ref mAs (7 mGy) with automatic exposure control (AEC, CareDose 4D) at three different positions (a) gantry isocenter, (b) upward off-centering and (c) downward off-centering...
January 10, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28072721/total-bilirubin-level-may-be-a-biomarker-of-nephropathy-in-type-2-diabetes-mellitus-a-meta-analysis-of-observational-studies-based-on-moose-compliant
#12
Dan Zhang, Bo Zhu, Wei Zhang, Wei Wang, Dan Guo, Ligang Yang, Lu Wang
Recently, the number of the studies on the relationship between the total bilirubin level (TBL) and diabetic nephropathy (DN) is increasing, but their results were not consistent. Therefore, we performed a meta-analysis to analyze the relationship between TBL and the risk of DN.We searched 5 databases before October 31, 2016, and reviewed the reference list of relevant articles. The fixed or random-effects model was used to pool risk estimates. We conducted the dose-response meta-analysis to evaluate the relationship between TBL and the risk of DN...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28072709/tranexamic-acid-reduces-perioperative-blood-loss-of-posterior-lumbar-surgery-for-stenosis-or-spondylolisthesis-a-randomized-trial
#13
Houyin Shi, Yunsheng Ou, Dianming Jiang, Zhengxue Quan, Zenghui Zhao, Yong Zhu
BACKGROUND: A prospective, randomized, double-blind, placebo-controlled study was performed. The routine usage of TA in spinal surgery is controversial. Only a few studies have focused on patients undergoing posterior lumbar surgery for stenosis or spondylolisthesis, although a large clinical cohort exists in the population. This study aimed to evaluate the effect and safety of TA in reducing perioperative blood loss in posterior lumbar surgery for stenosis or spondylolisthesis. METHODS: 100 eligible patients out of 126 were randomized to receive either a bolus dose of 30 mg/kg TA i...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28070716/pharmacokinetics-and-saturable-absorption-of-gabapentin-in-nursing-home-elderly-patients
#14
Ghada F Ahmed, Sai Praneeth R Bathena, Richard C Brundage, Ilo E Leppik, Jeannine M Conway, Janice B Schwartz, Angela K Birnbaum
Pharmacokinetic data of gabapentin (GBP) in community-dwelling elderly patients show a significant effect of advanced age on GBP pharmacokinetics due to altered renal function. However, there are no data in elderly nursing home (NH) patients to evaluate gabapentin absorption and elimination. Our objective was to characterize the pharmacokinetics of GBP in elderly nursing home patients maintained on GBP therapy. This was a prospective pharmacokinetic study in elderly nursing home patients (≥60 years) receiving GBP for the management of chronic pain or epilepsy from seven nursing homes...
January 9, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28070242/computed-tomography-and-patient-risk-facts-perceptions-and-uncertainties
#15
REVIEW
Stephen P Power, Fiachra Moloney, Maria Twomey, Karl James, Owen J O'Connor, Michael M Maher
Since its introduction in the 1970s, computed tomography (CT) has revolutionized diagnostic decision-making. One of the major concerns associated with the widespread use of CT is the associated increased radiation exposure incurred by patients. The link between ionizing radiation and the subsequent development of neoplasia has been largely based on extrapolating data from studies of survivors of the atomic bombs dropped in Japan in 1945 and on assessments of the increased relative risk of neoplasia in those occupationally exposed to radiation within the nuclear industry...
December 28, 2016: World Journal of Radiology
https://www.readbyqxmd.com/read/28066955/dose-rates-of-antimicrobial-substances-in-boar-semen-preservation-time-to-establish-new-protocols
#16
M Schulze, M Grobbel, A Riesenbeck, S Brüning, J Schaefer, M Jung, R Grossfeld
To achieve a standardized number of spermatozoa in the final AI dose, varying amounts of extender fluid with a fixed concentration of antimicrobial substances are currently added to boar ejaculates. This practice ignores the different degrees of dilution of the antimicrobials in the end product. In calculating the final concentration of gentamicin in AI doses from 27,538 processed boar ejaculates, we demonstrated varying gentamicin concentrations in the resultant extended boar semen samples. The median concentration was 220...
January 9, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28065226/effects-of-two-intranasal-dexmedetomidine-doses-as-premedication-on-sevoflurane-ec50-for-successful-laryngeal-mask-airway-placement-in-children
#17
Jin Xu, Xiao-Ming Deng, Ling-Xin Wei, Dong Yang, Ju-Hui Liu, Juan Zhi, Ya-Nan Li
Objective To observe the effects of two different intranasal dexmedetomidine doses as premedication on the EC50 of sevoflurane for successful laryngeal mask airway placement in children. Methods Children aged 3-6 years, of American Society of Anesthesiologists physical status 1, and scheduled for plastic surgery were enrolled in this study. Children were assigned to receive either spray administration of intranasal dexmedetomidine 1 μg/kg (group D1, n=21) or 2 μg/kg (group D2, n=20) approximately 30 minutes before anesthesia...
December 20, 2016: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/28064090/molecular-insight-into-atypical-instability-behavior-of-fixed-dose-combination-containing-amlodipine-besylate-and-losartan-potassium
#18
Tarun Handa, Shalu Jhajra, Shweta Bhagat, P V Bharatam, Asit K Chakraborti, Saranjit Singh
Combination therapy with the use of fixed-dose combinations (FDCs) is evincing increasing interest of prescribers, manufacturers and even regulators, evidently due to the primary benefit of improved patient compliance. However, owing to potential of drug-drug interaction, FDCs require closer scrutiny with respect to their physical and chemical stability. Accordingly, the purpose of the present study was to explore stability behavior of a popular antihypertensive combination of amlodipine besylate (AML) and losartan potassium (LST)...
December 29, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28064064/the-role-of-physicians-in-prescribing-irrational-fixed-dose-combination-medicines-in-india
#19
Ajay Bhaskarabhatla, Chirantan Chatterjee
Many irrational fixed-dose combination (FDC) medicines have been approved by the state and central regulatory authorities in India and their use is promoted extensively by pharmaceutical firms. In this study, we examine the previously-neglected role of physicians in India, as their prescriptions are essential for the continued proliferation of FDCs. Primarily using longitudinal data on prescriptions by 4600 physicians spanning 19 disciplinary categories for 48 months between 2008 and 2011 provided by IMS Medical Audit, we study 201 medicines in the cardiovascular and oral-antidiabetic markets...
December 18, 2016: Social Science & Medicine
https://www.readbyqxmd.com/read/28063922/efficacy-and-safety-of-a-four-drug-fixed-dose-combination-regimen-versus-separate-drugs-for-treatment-of-pulmonary-tuberculosis-a-systematic-review-and-meta-analysis
#20
REVIEW
Glaura C Lima, Emilia V Silva, Pérola de O Magalhães, Janeth S Naves
INTRODUCTION: Tuberculosis, particularly multi-drug-resistant tuberculosis, is a major cause of morbidity and mortality worldwide. To the best of our knowledge, however, no study to date has assessed the combined use of the four available drugs for tuberculosis treatment, which is an issue of great clinical relevance. OBJECTIVE: To determine whether the four-drug fixed-dose combination is safer or more effective than separate drugs for treatment of pulmonary tuberculosis...
December 23, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
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