454 research outputs found
The development of the adult deterioration detection system (ADDS) chart
The Adult Deterioration Detection System (ADDS) observation chart described in this short report was developed as part of a research project carried out at The University of Queensland for Queensland Health and the Australian Commission on Safety and Quality in Health Care (ACSQHC). The aim of the project was to investigate the design and use of observation charts in recognising and managing patient deterioration, including the design and evaluation of a new adult observation chart that incorporated human factors principles
Paper-based patient chart design information sheet
The purpose of this document is to help those involved in creating paper-based patient charts improve the human factors aspects of the design of their charts. It is based on the outcomes of a research project (âHuman Factors Research Regarding Observation Chartsâ) carried out at the University of Queensland for the Australian Commission on Safety and Quality in Health Care, the Queensland Health Patient Safety and Quality Improvement Service and the Clinical Skills Development Service. Copies of the reports associated with this project are available online from the Commissionâs website (www.safetyandquality.gov.au). As part of this project, we systematically reviewed 25 existing patient observation charts and developed a new chart (the âADDS chartâ) designed to identify patient deterioration, which was then evaluated in behavioural experiments. In this document, we will use some of the issues arising from this process to illustrate human factors design considerations for paper-based patient charts in general
Detecting abnormal vital signs on six observation charts: An experimental comparison
Paper-based observation charts are the principal means of monitoring changes to patientsâ vital signs. There is considerable variation in the design of observation charts and a lack of empirical research on the performance of different designs. This report describes the results of a study carried out as part of a project funded by the Australian Commission for Safety and Quality in Health Care and Queensland Health to investigate the design and use of observation charts in recognising and managing patient deterioration, including the design and evaluation of a new adult observation chart that incorporated human factors principles. The first phase of this project involved using a procedure known as heuristic analysis to review 25 observation charts from Australia and New Zealand. 1,189 usability problems, which could lead to errors in recording data and identifying patient deterioration, were identified in the charts. The results from the heuristic analysis were used to design a new chart (the Adult Deterioration Detection System [ADDS] chart) based on human factors principles and current best practice. The study described in this report involved an empirical comparison of six charts (two versions of the ADDS chart, two existing charts rated as âwell designedâ in the heuristic analysis, one existing chart rated as being of âaverage designâ, and one existing chart rated as âpoorly designedâ). Novices (individuals who were unfamiliar with using patient charts) and health professionals (doctors and nurses) were recruited as participants. Each chart design was shown to each participant four times displaying different physiological data with one abnormal vital sign (e.g. a high systolic blood pressure), and four times displaying different normal physiological data. After memorising the normal ranges for each vital sign, participants had to classify the physiological data on the charts as ânormalâ or âabnormalâ. Error rates (the proportion of trials where participants made an incorrect normal/abnormal judgement) and response time (the time to read the chart and make the judgement) were measured. Results indicated that chart design had a statistically significant effect on both error rates and response time, with the charts identified as having better design tending to yield fewer errors and shorter decision times. Specifically, the two versions of the ADDS chart outperformed all the existing charts on both metrics, where the other charts yielded between 2.5 and 3.3 times as many errors as the ADDS chart. There was no significant difference between novices and health professionals in error rates for any chart, but the health professionals were significantly faster than novices at making their decisions for the charts rated as âaverageâ and âpoorâ. There was no significant difference between doctors and nurses on either of the two performance measures for any of the charts. These data indicate that differences in the design of observation charts have a profound impact on chart usersâ decisions regarding patientsâ vital signs as well as the time it takes to make such decisions. Based on the current data, it appears that the ADDS chart is significantly better at signalling patient deterioration than other currently available charts
An Online Survey of Health Professionalsâ Opinions Regarding Observation Charts
The current study was the second stage of a project funded by the Australian Commission for Quality and Safety in Health Care and Queensland Health to investigate the design and use of observation charts in recognising and managing patient deterioration, including the design and evaluation of a new adult observation chart that incorporated human factors principles. Improving the recognition and management of patients who deteriorate whilst in hospital is a frequently cited goal for patient safety. Changes in physiological observations or âvital signsâ commonly precede serious adverse medical events. Paper-based observation charts are the chief means of recording and monitoring changes to patientsâ vital signs. One approach to improve the recognition and management of deteriorating patients is to improve the design of paper-based observation charts (note that the management of patient deterioration can potentially be affected by chart design if, for example, action plans are included on the chart). There is considerable variation in the design of observation charts in current use in Australia and a lack of empirical research on the performance of observation charts in general. The aim of the current study was to gauge the opinions of the population who actually use observation charts. We recruited a large sample of health professionals (N = 333) to answer general questions about the design of observation charts and specific questions about nine observation charts. The participants reported using observation charts daily, but only a minority reported having received any formal training in the use of such charts. In our previously-reported heuristic analysis of observation charts (1), we found that the majority of charts included a large number of abbreviations. In this survey, participants were asked to nominate which term they first thought of when seeing a particular abbreviation. Most abbreviations were overwhelmingly assigned the same meaning. However, some abbreviations had groups of participants nominating different terms for the same abbreviation. Participants were also asked to nominate their preferred terms for nine vital signs that commonly appear on observation charts. For some vital signs, there was a high level of agreement as to which term was easiest to understand; however, for other vital signs, there was no clearly preferred term. Participants were also asked about their chart design preferences both in terms of (a) recording observations and (b) detecting deterioration. In both instances, participants preferred the option to âPlot the value on a graph with graded colouring, where the colours correspond to a scoring system or graded responses for abnormalityâ. Participantsâ preference was in line with what a human factors approach would recommend (i.e. charts with a colour-coded track and trigger system). In the final sections of the survey, participants were first asked to respond to 13 statements regarding the design of their own institutionâs current observation chart, and then to respond to the same 13 statements for one of nine randomly-assigned observation charts. The nine observation charts included the new Adult Deterioration Detection System (ADDS) chart and eight charts of âgoodâ, âaverageâ, or âpoorâ design quality from the heuristic analysis. Participantsâ mean aggregated rating across the 13 items for their institutionâs current observation chart was close to the scaleâs mid-point, 3 = neutral. For the assigned charts, there was a statistically significant effect of chart type on the aggregated rating. The a priori âpoorâ quality charts were each rated as having a significantly poorer design compared with each of the other charts (collectively, the a priori âaverageâ and âgoodâ quality charts). There was partial support for our hypothesis that health professionals would rate the âgoodâ charts as having better design, compared to the âaverageâ and âpoorâ charts. In conclusion, the online survey served two main purposes. First, it collected quantitative data on health professionalsâ general preferences regarding aspects of the design of observation charts. This information informed the design of the ADDS chart and could also be used by other chart designers to produce more user-friendly hospital charts. Second, the online survey enabled health professionals to rate the design of the new ADDS chart as well as eight existing charts of varying quality. Overall, health professionals agreed with our human factors-based rating with regards to the âpoorâ quality charts. However, the health professionals did not differentiate between the âaverageâ and âgoodâ quality charts in their ratings
Electron-nuclear interaction in 13C nanotube double quantum dots
For coherent electron spins, hyperfine coupling to nuclei in the host
material can either be a dominant source of unwanted spin decoherence or, if
controlled effectively, a resource allowing storage and retrieval of quantum
information. To investigate the effect of a controllable nuclear environment on
the evolution of confined electron spins, we have fabricated and measured
gate-defined double quantum dots with integrated charge sensors made from
single-walled carbon nanotubes with a variable concentration of 13C (nuclear
spin I=1/2) among the majority zero-nuclear-spin 12C atoms. Spin-sensitive
transport in double-dot devices grown using methane with the natural abundance
(~ 1%) of 13C is compared with similar devices grown using an enhanced (~99%)
concentration of 13C. We observe strong isotope effects in spin-blockaded
transport, and from the dependence on external magnetic field, estimate the
hyperfine coupling in 13C nanotubes to be on the order of 100 micro-eV, two
orders of magnitude larger than anticipated theoretically. 13C-enhanced
nanotubes are an interesting new system for spin-based quantum information
processing and memory, with nuclei that are strongly coupled to gate-controlled
electrons, differ from nuclei in the substrate, are naturally confined to one
dimension, lack quadrupolar coupling, and have a readily controllable
concentration from less than one to 10^5 per electron.Comment: supplementary discussion at http://marcuslab.harvard.edu/13CSupp.pd
Relaxation and Dephasing in a Two-Electron 13C Nanotube Double Quantum Dot
We use charge sensing of Pauli blockade (including spin and isospin) in a
two-electron 13C nanotube double quantum dot to measure relaxation and
dephasing times. The relaxation time, T1, first decreases with parallel
magnetic field then goes through a minimum in a field of 1.4 T. We attribute
both results to the spin-orbit-modified electronic spectrum of carbon
nanotubes, which suppresses hyperfine mediated relaxation and enhances
relaxation due to soft phonons. The inhomogeneous dephasing time, T2*, is
consistent with previous data on hyperfine coupling strength in 13C nanotubes.Comment: related papers at http://marcuslab.harvard.ed
Predictors of dropout in face-to-face and internet-based cognitive-behavioral therapy for bulimia nervosa in a randomized controlled trial
Objective: We sought to identify predictors and moderators of failure to engage (i.e., pretreatment attrition) and dropout in both Internet-based and traditional face-to-face cognitive-behavioral therapy (CBT) for bulimia nervosa. We also sought to determine if Internet-based treatment reduced failure to engage and dropout. Method: Participants (N = 191, 98% female) were randomized to Internet-based CBT (CBT4BN) or traditional face-to-face group CBT (CBTF2F). Sociodemographics, clinical history, eating disorder severity, comorbid psychopathology, health status and quality of life, personality and temperament, and treatment-related factors were investigated as predictors. Results: Failure to engage was associated with lower perceived treatment credibility and expectancy (odds ratio [OR] = 0.91, 95% CI: 0.82, 0.97) and body mass index (BMI) (OR = 1.10; 95% CI: 1.03, 1.18). Dropout was predicted by not having a college degree (hazard ratio [HR] = 0.55; 95% CI: 0.37, 0.81), novelty seeking (HR = 1.02; 95% CI: 1.01, 1.03), previous CBT experience (HR = 1.77; 95% CI: 1.16, 2.71), and randomization to the individual's nonpreferred treatment format (HR = 1.95, 95% CI: 1.28, 2.96). Discussion: Those most at risk of failure to engage had a higher BMI and perceived treatment as less credible and less likely to succeed. Dropout was associated with less education, higher novelty seeking, previous CBT experience, and a mismatch between preferred and assigned treatment. Contrary to expectations, Internet-based CBT did not reduce failure to engage or dropout
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