337 research outputs found
Hexagons, Kinks and Disorder in Oscillated Granular Layers
Experiments on vertically oscillated granular layers in an evacuated
container reveal a sequence of well-defined pattern bifurcations as the
container acceleration is increased. Period doublings of the layer center of
mass motion and a parametric wave instability interact to produce hexagons and
more complicated patterns composed of distinct spatial domains of different
relative phase separated by kinks (phase discontinuities). Above a critical
acceleration, the layer becomes disordered in both space and time.Comment: 4 pages. The RevTeX file has a macro allowing various styles. The
appropriate style is "myprint" which is the defaul
Composição corporal e exigĂȘncias lĂquidas de macrominerais para ganho de peso em bovinos 5/8 HolandĂȘs-Zebu em pastejo na zona da mata de Pernambuco
Bauhinia forficata link shoot regeneration: histological analysis of organogenesis pathway
Diversity of frugivorous flies (Tephritidae e Lonchaeidae) in three municipalities in southern Bahia
Honey and propolis production, hygiene and defense behaviors of two generations of Africanized honey bees
A simplified (modified) Duke Activity Status Index (M-DASI) to characterise functional capacity: A secondary analysis of the Measurement of Exercise Tolerance before Surgery (METS) study
Background
Accurate assessment of functional capacity, a predictor of postoperative morbidity and mortality, is essential to improving surgical planning and outcomes. We assessed if all 12 items of the Duke Activity Status Index (DASI) were equally important in reflecting exercise capacity.
Methods
In this secondary cross-sectional analysis of the international, multicentre Measurement of Exercise Tolerance before Surgery (METS) study, we assessed cardiopulmonary exercise testing and DASI data from 1455 participants. Multivariable regression analyses were used to revise the DASI model in predicting an anaerobic threshold (AT) >11 ml kg â1 min â1 and peak oxygen consumption (VO 2 peak) >16 ml kg â1 min â1, cut-points that represent a reduced risk of postoperative complications.
Results
Five questions were identified to have dominance in predicting AT>11 ml kg â1 min â1 and VO 2 peak>16 ml.kg â1min â1. These items were included in the M-DASI-5Q and retained utility in predicting AT>11 ml.kg â1.min â1 (area under the receiver-operating-characteristic [AUROC]-AT: M-DASI-5Q=0.67 vs original 12-question DASI=0.66) and VO 2 peak (AUROC-VO2 peak: M-DASI-5Q 0.73 vs original 12-question DASI 0.71). Conversely, in a sensitivity analysis we removed one potentially sensitive question related to the ability to have sexual relations, and the ability of the remaining four questions (M-DASI-4Q) to predict an adequate functional threshold remained no worse than the original 12-question DASI model. Adding a dynamic component to the M-DASI-4Q by assessing the chronotropic response to exercise improved its ability to discriminate between those with VO 2 peak>16 ml.kg â1.min â1 and VO 2 peak<16 ml.kg â1.min â1.
Conclusions
The M-DASI provides a simple screening tool for further preoperative evaluation, including with cardiopulmonary exercise testing, to guide perioperative management
ParĂąmetros biolĂłgicos e tabela de vida de fertilidade de Neopamera bilobata (Hemiptera: Rhyparochromidae) em morangueiro
EficĂĄcia acaricida de uma emulsĂŁo contendo 10% de Ăłleo de nim (Azadirachta indica) no controle de Psoroptes ovis em coelhos naturalmente infestados
MINERALS AND PHENOLIC COMPOUNDS OF CAGAITA FRUITS AT DIFFERENT MATURATION STAGES (Eugenia dysenterica)
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