Institution
Queen's University
Education•Kingston, Ontario, Canada•
About: Queen's University is a education organization based out in Kingston, Ontario, Canada. It is known for research contribution in the topics: Population & Poison control. The organization has 41065 authors who have published 78811 publications receiving 2864794 citations. The organization is also known as: Queen's College at Kingston.
Papers published on a yearly basis
Papers
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TL;DR: Comparing breathing pattern parameters, dynamic operational lung volumes, and Borg dyspnea ratings in patients with severe CAL and in healthy age-matched normal subjects during cycle ergometry to symptom-limitation found delta EILVdyn from various dynamic ventilatory parameters as the strongest predictor of delta Borg.
Abstract: There is considerable intersubject variability in the perceived intensity of breathlessness for a given level of activity among patients with chronic airflow limitation (CAL). To examine possible factors contributing to this variability we compared breathing pattern parameters, dynamic operational lung volumes, and Borg dyspnea ratings in 23 patients with severe CAL and in 10 healthy age-matched normal subjects during cycle ergometry to symptom-limitation. Patients with CAL had significantly (p < 0.01) higher levels of ventilation (% maximal voluntary ventilation) for a given work rate (slope of VE(%MVV)/WR(% pred max) = 1.51 +/- 0.18 versus 0.63 +/- 0.10; mean +/- SEM) and greater dynamic lung hyperinflation (DH) (change [delta] in end-expiratory lung volume [EELVdyn] = +0.31 +/- 0.11 L versus -0.16 +/- 0.22 L). Compared with normal subjects at a standardized VE (30 L/min), the CAL group was more breathless Borg = 4 +/- 1 versus 2 +/- 1, p < 0.01) and hyperinflated (EELVdyn = 75 +/- 3 versus 46 +/- 6% TLC, p < 0.001; end-inspiratory lung volume [EILVdyn] = 85 +/- 3 versus 67 +/- 5% TLC, p < 0.01). Within the CAL group, change in Borg ratings correlated with delta VE(%MVV) (r = 0.77, p < 0.001) and with slope of VE(%MVV)/WR(% pred max) (r = 0.48, p < 0.01). Regression analysis selected delta EILVdyn (or delta inspiratory reserve volume [delta IRVdyn]) from various dynamic ventilatory parameters as the strongest predictor of delta Borg (r = 0.63, p < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
535 citations
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TL;DR: Several risk factors for both overweight and obesity in childhood are identifiable during infancy and future research needs to focus on whether it is clinically feasible for healthcare professionals to identify infants at greatest risk.
Abstract: Objective To determine risk factors for childhood
overweight that can be identified during the first year of
life to facilitate early identification and targeted
intervention.
Design Systematic review and meta-analysis.
Search strategy Electronic database search of
MEDLINE, EMBASE, PubMed and CAB Abstracts.
Eligibility criteria Prospective observational studies
following up children from birth for at least 2 years.
Results Thirty prospective studies were identified.
Significant and strong independent associations with
childhood overweight were identified for maternal prepregnancy
overweight, high infant birth weight and rapid
weight gain during the first year of life. Meta-analysis
comparing breastfed with non-breastfed infants found a
15% decrease (95% CI 0.74 to 0.99; I2=73.3%; n=10)
in the odds of childhood overweight. For children of
mothers smoking during pregnancy there was a 47%
increase (95% CI 1.26 to 1.73; I2=47.5%; n=7) in the
odds of childhood overweight. There was some evidence
associating early introduction of solid foods and childhood
overweight. There was conflicting evidence for duration of
breastfeeding, socioeconomic status at birth, parity and
maternal marital status at birth. No association with
childhood overweight was found for maternal age or
education at birth, maternal depression or infant ethnicity.
There was inconclusive evidence for delivery type,
gestational weight gain, maternal postpartum weight loss
and ‘fussy’ infant temperament due to the limited
number of studies.
Conclusions Several risk factors for both overweight
and obesity in childhood are identifiable during infancy.
Future research needs to focus on whether it is clinically
feasible for healthcare professionals to identify infants at
greatest risk.
535 citations
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Population Health Research Institute1, McMaster University2, Université de Montréal3, Queen's University4, Cape Breton Regional Hospital5, University of Calgary6, University of Manitoba7, University of Alberta8, Dalhousie University9, McGill University Health Centre10, Cleveland Clinic11, Ottawa Hospital Research Institute12, University of Ottawa13
TL;DR: The Canadian Cardiovascular Society Guidelines Committee and key Canadian opinion leaders believed there was a need for up to date guidelines that used the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) system of evidence assessment for patients who undergo noncardiac surgery.
535 citations
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TL;DR: The DarkSide-20k detector as discussed by the authors is a direct WIMP search detector using a two-phase Liquid Argon Time Projection Chamber (LAr TPC) with an active mass of 23 t (20 t).
Abstract: Building on the successful experience in operating the DarkSide-50 detector, the DarkSide Collaboration is going to construct DarkSide-20k, a direct WIMP search detector using a two-phase Liquid Argon Time Projection Chamber (LAr TPC) with an active (fiducial) mass of 23 t (20 t). This paper describes a preliminary design for the experiment, in which the DarkSide-20k LAr TPC is deployed within a shield/veto with a spherical Liquid Scintillator Veto (LSV) inside a cylindrical Water Cherenkov Veto (WCV). This preliminary design provides a baseline for the experiment to achieve its physics goals, while further development work will lead to the final optimization of the detector parameters and an eventual technical design. Operation of DarkSide-50 demonstrated a major reduction in the dominant 39Ar background when using argon extracted from an underground source, before applying pulse shape analysis. Data from DarkSide-50, in combination with MC simulation and analytical modeling, shows that a rejection factor for discrimination between electron and nuclear recoils of $>3 \times 10^{9}$
is achievable. This, along with the use of the veto system and utilizing silicon photomultipliers in the LAr TPC, are the keys to unlocking the path to large LAr TPC detector masses, while maintaining an experiment in which less than $< 0.1$
events (other than $
u$
-induced nuclear recoils) is expected to occur within the WIMP search region during the planned exposure. DarkSide-20k will have ultra-low backgrounds than can be measured in situ, giving sensitivity to WIMP-nucleon cross sections of $1.2 \times 10^{-47}$
cm2 (
$1.1 \times 10^{-46}$
cm2) for WIMPs of 1 TeV/c2 (10 TeV/c2) mass, to be achieved during a 5 yr run producing an exposure of 100 t yr free from any instrumental background.
534 citations
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TL;DR: A model was developed to link the predicted birth weight to a fetal weight curve which outlines how this weight is to be reached in an uncomplicated pregnancy and a formula was derived which describes the median fetal weight at each gestation as a proportion of the optimal term weight.
Abstract: The monitoring of fetal weight is an important aspect of antenatal care. To construct an individually adjustable standard, we developed a model to link the predicted birth weight to a fetal weight curve which outlines how this weight is to be reached in an uncomplicated pregnancy. A formula was derived which describes the median fetal weight at each gestation as a proportion of the optimal term weight, and also defines the 90th and 10th centile curves as normal limits. We analyzed a birth weight database of 38,114 singleton, routine ultrasound-dated pregnancies resulting in term deliveries. By stepwise multiple regression analysis, we derived coefficients for the factors that act as variables on term birth weight in our population. Apart from gestational age and sex, the maternal height, weight at first visit, ethnic group, parity and smoking all have significant and independent effects on birth weight. The variation due to ethnic group appears to be physiological in this population. Smoking is associated with a reduction in birth weight, which is independent of maternal physique and related to the number of cigarettes per day as reported at the first visit. We have developed a software program which calculates, on the basis of pregnancy variables entered at the first visit, an adjusted normal range for fetal size. This can be printed out as a chart and used for antenatal surveillance of growth.
534 citations
Authors
Showing all 41312 results
Name | H-index | Papers | Citations |
---|---|---|---|
Karl J. Friston | 217 | 1267 | 217169 |
David Miller | 203 | 2573 | 204840 |
Raymond J. Dolan | 196 | 919 | 138540 |
Matthew Meyerson | 194 | 553 | 243726 |
Stephen V. Faraone | 188 | 1427 | 140298 |
Deborah J. Cook | 173 | 907 | 148928 |
Feng Zhang | 172 | 1278 | 181865 |
David Cameron | 154 | 1586 | 126067 |
David J. Brooks | 152 | 1056 | 94335 |
Rajesh Kumar | 149 | 4439 | 140830 |
J. Fraser Stoddart | 147 | 1239 | 96083 |
Richard S. J. Frackowiak | 142 | 309 | 100726 |
Hal Evans | 141 | 1445 | 107406 |
Andrew J. Lees | 140 | 877 | 91605 |
Janet Rossant | 138 | 416 | 71913 |