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Units of Measure

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21. Validity and repeatability of inertial measurement units for measuring gait parameters (PubMed)

Validity and repeatability of inertial measurement units for measuring gait parameters Inertial measurement units (IMUs) are small wearable sensors that have tremendous potential to be applied to clinical gait analysis. They allow objective evaluation of gait and movement disorders outside the clinic and research laboratory, and permit evaluation on large numbers of steps. However, repeatability and validity data of these systems are sparse for gait metrics. The purpose of this study (...) was to determine the validity and between-day repeatability of spatiotemporal metrics (gait speed, stance percent, swing percent, gait cycle time, stride length, cadence, and step duration) as measured with the APDM Opal IMUs and Mobility Lab system. We collected data on 39 healthy subjects. Subjects were tested over two days while walking on a standard treadmill, split-belt treadmill, or overground, with IMUs placed in two locations: both feet and both ankles. The spatiotemporal measurements taken

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2017 Gait & posture

22. Method for Estimating Three-Dimensional Knee Rotations Using Two Inertial Measurement Units: Validation with a Coordinate Measurement Machine (PubMed)

Method for Estimating Three-Dimensional Knee Rotations Using Two Inertial Measurement Units: Validation with a Coordinate Measurement Machine Three-dimensional rotations across the human knee serve as important markers of knee health and performance in multiple contexts including human mobility, worker safety and health, athletic performance, and warfighter performance. While knee rotations can be estimated using optical motion capture, that method is largely limited to the laboratory and small (...) capture volumes. These limitations may be overcome by deploying wearable inertial measurement units (IMUs). The objective of this study is to present a new IMU-based method for estimating 3D knee rotations and to benchmark the accuracy of the results using an instrumented mechanical linkage. The method employs data from shank- and thigh-mounted IMUs and a vector constraint for the medial-lateral axis of the knee during periods when the knee joint functions predominantly as a hinge. The method

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2017 Sensors (Basel, Switzerland)

23. Wide-area measurement system-based supervision of protection schemes with minimum number of phasor measurement units (PubMed)

Wide-area measurement system-based supervision of protection schemes with minimum number of phasor measurement units Cascade tripping of power lines triggered by maloperation of zone-3 relays during stressed system conditions, such as load encroachment, power swing and voltage instability, has led to many catastrophic power failures worldwide, including Indian blackouts in 2012. With the introduction of wide-area measurement systems (WAMS) into the grids, real-time monitoring of transmission (...) network condition is possible. A phasor measurement unit (PMU) sends time-synchronized data to a phasor data concentrator, which can provide a control signal to substation devices. The latency associated with the communication system makes WAMS suitable for a slower form of protection. In this work, a method to identify the faulted line using synchronized data from strategic PMU locations is proposed. Subsequently, a supervisory signal is generated for specific relays in the system for any disturbance

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2017 Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

24. Evidence Brief - Use of Patient Reported Outcome Measures for Measurement Based Care in Mental Health Shared Decision-Making

Evidence Brief - Use of Patient Reported Outcome Measures for Measurement Based Care in Mental Health Shared Decision-Making [ November 2018 Prepared for: Department of Veterans Affairs Veterans Health Administration Quality Enhancement Research Initiative Health Services Research & Development Service Washington, DC 20420 Prepared by: Evidence-based Synthesis Program (ESP) Coordinating Center Portland VA Health Care System Portland, OR Mark Helfand, MD, MPH, MS, Director Department of Veterans (...) Affairs Health Services Research & Development Service Evidence Brief: Use of Patient Reported Outcome Measures for Measurement Based Care in Mental Health Shared Decision-Making Investigators: Kim Peterson, MS Johanna Anderson, MPH Donald Bourne, MPH Evidence-based Synthesis Program 4 Evidence Brief: Use of PROMs for MBC in Shared Decision-Making Evidence-based Synthesis Program i PREFACE The VA Evidence-based Synthesis Program (ESP) was established in 2007 to provide timely and accurate syntheses

2018 Veterans Affairs Evidence-based Synthesis Program Reports

25. Quantifying performance on an outdoor agility drill using foot-mounted inertial measurement units. (PubMed)

Quantifying performance on an outdoor agility drill using foot-mounted inertial measurement units. Running agility is required for many sports and other physical tasks that demand rapid changes in body direction. Quantifying agility skill remains a challenge because measuring rapid changes of direction and quantifying agility skill from those measurements are difficult to do in ways that replicate real task/game play situations. The objectives of this study were to define and to measure agility (...) performance for a (five-cone) agility drill used within a military obstacle course using data harvested from two foot-mounted inertial measurement units (IMUs). Thirty-two recreational athletes ran an agility drill while wearing two IMUs secured to the tops of their athletic shoes. The recorded acceleration and angular rates yield estimates of the trajectories, velocities and accelerations of both feet as well as an estimate of the horizontal velocity of the body mass center. Four agility performance

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2017 PLoS ONE

26. Validity and Reliability of an Inertial Measurement Unit-based 3-Dimensional Angular Measurement of Cervical Range of Motion. (PubMed)

Validity and Reliability of an Inertial Measurement Unit-based 3-Dimensional Angular Measurement of Cervical Range of Motion. This study aimed to assess the reliability and validity of an inertial measurement unit (IMU)-based 3-dimensional (3D) angular measurement system for evaluating cervical range of motion.Thirty-three healthy participants (21.9 ± 2.1 years; 162.0 ± 6.0 cm; 55.8 ± 9.0 kg; 21.2 ± 2.4 kg/m2) were evaluated. Kinematic data of the cervical joints were simultaneously obtained (...) using the IMU 3D angular, goniometer, and photographic measurements during cervical flexion (0°, 30°, and 50°), extension (30°, 50°), side-bending (0°, 20°, 40°), and rotation (45°). Test-retest reliability was investigated in each measurement method. Concurrent validity was assessed with the direct comparison between the IMU 3D angular measurement and other methods.The IMU 3D angular measurement showed mostly good to high test-retest reliability with relatively small standard error of measurement

2019 Journal of Manipulative and Physiological Therapeutics

27. Calibration and Noise Identification of a Rolling Shutter Camera and a Low-Cost Inertial Measurement Unit (PubMed)

Calibration and Noise Identification of a Rolling Shutter Camera and a Low-Cost Inertial Measurement Unit A low-cost inertial measurement unit (IMU) and a rolling shutter camera form a conventional device configuration for localization of a mobile platform due to their complementary properties and low costs. This paper proposes a new calibration method that jointly estimates calibration and noise parameters of the low-cost IMU and the rolling shutter camera for effective sensor fusion in which

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2018 Sensors (Basel, Switzerland)

28. A Proposal for an Intermediate Care Unit-Quality Measurement Framework (PubMed)

A Proposal for an Intermediate Care Unit-Quality Measurement Framework Rationale, Aims, and Objectives. The Intermediate Care Unit (IMCU) is a hospital unit which is logistically situated between the hospital ward and the Intensive Care Unit (ICU). There is debate regarding the value of the IMCU. Understanding its value is compromised by the lack of adequate quality indicators. Therefore, this study identifies currently used IMCU indicators and evaluates their usefulness. Methods. Through (...) a systematic literature search, currently used quality indicators were identified and evaluated for their importance using a proposed IMCU-specific quality measurement framework. Results. From 4034 titles and abstracts, 168 articles were selected for full-text review. Of these, 22 articles were included, which reported IMCU quality at the level of the IMCU (n = 12), the ICU (n = 5), both IMCU and ICU (n = 3) or hospital level (n = 2). At the IMCU, the IMCU mortality (n = 16), discharge-to-ICU rate (n = 7

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2018 Critical care research and practice

29. Preferred Placement and Usability of a Smart Textile System vs. Inertial Measurement Units for Activity Monitoring (PubMed)

Preferred Placement and Usability of a Smart Textile System vs. Inertial Measurement Units for Activity Monitoring Wearable sensors and systems have become increasingly popular in recent years. Two prominent wearable technologies for human activity monitoring are smart textile systems (STSs) and inertial measurement units (IMUs). Despite ongoing advances in both, the usability aspects of these devices require further investigation, especially to facilitate future use. In this study, 18

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2018 Sensors (Basel, Switzerland)

30. Effectiveness of risk minimization measures for the use of cilostazol in United Kingdom, Spain, Sweden, and Germany (PubMed)

Effectiveness of risk minimization measures for the use of cilostazol in United Kingdom, Spain, Sweden, and Germany The purpose of the study is to evaluate the effectiveness of risk minimization measures-labeling changes and communication to health care professionals-recommended by the European Medicines Agency for use of cilostazol for the treatment of intermittent claudication in Europe.Observational study of cilostazol in The Health Improvement Network (United Kingdom), EpiChron Cohort (...) (Spain), SIDIAP (Spain), Swedish National Databases, and GePaRD (Germany). Among new users of cilostazol, we compared the prevalence of conditions targeted by the risk minimization measures in the periods before (2002-2012) and after (2014) implementation. Conditions evaluated were prevalence of smoking, cardiovascular conditions, concurrent use of ≥2 antiplatelet agents, concurrent use of potent CYP3A4/CYP2C19 inhibitors and high-dose cilostazol, early monitoring of all users, and continuous

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2018 Pharmacoepidemiology and drug safety

31. Lung-thorax compliance measured during a spontaneous breathing trial is a good index of extubation failure in the surgical intensive care unit: a retrospective cohort study (PubMed)

Lung-thorax compliance measured during a spontaneous breathing trial is a good index of extubation failure in the surgical intensive care unit: a retrospective cohort study Extubation failure is associated with mortality and morbidity in the intensive care unit. Ventilator weaning protocols have been introduced, and extubation is conducted based on the results of a spontaneous breathing trial. Room for improvement still exists in extubation management, and additional objective indices may (...) , patients over 18 years of age were mechanically ventilated, weaned with proportional assist ventilation, and underwent a spontaneous breathing trial process in surgical intensive care units of Kagawa University Hospital from July 2014 to June 2016. Extubation failure was the outcome measure of the study. We defined extubation failures as when patients were reintubated or underwent non-invasive positive-pressure ventilation within 24 h after extubation. Receiver operating characteristic (ROC) curve

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2018 Journal of intensive care

32. Single-Item Measures for Detecting Sleep Problems in United States Military Veterans. (PubMed)

Single-Item Measures for Detecting Sleep Problems in United States Military Veterans. As many as two-thirds of post-9/11 military veterans complain of sleep problems, including insomnia-like symptoms. Left untreated, chronic sleep problems increase the risk for a range of negative outcomes, including incident mental health disorders. However, sleep problems remain overlooked in primary care settings. To date, no brief sleep screeners have been developed or validated. Items assessing insomnia

2018 Journal of General Internal Medicine

33. The dynamic relationships between economic status and health measures among working-age adults in the United States. (PubMed)

The dynamic relationships between economic status and health measures among working-age adults in the United States. We examine the dynamic relationships between economic status and health measures using data from 8 waves of the Panel Study of Income Dynamics from 1999 to 2013. Health measures are self-rated health (SRH) and functional limitations; economic status measures are labor income (earnings), family income, and net wealth. We use 3 different types of models: (a) ordinary least squares

2018 Health economics

34. The relationship between elevated prehospital point-of-care lactate measurements, intensive care unit admission, and mortality: A retrospective review of adult patients. (PubMed)

The relationship between elevated prehospital point-of-care lactate measurements, intensive care unit admission, and mortality: A retrospective review of adult patients. To determine whether prehospital point-of-care lactate (pLA) is associated with mortality, admission, and duration of hospital stay.A retrospective clinical audit, where elevated lactate was defined as ≥2 mmol/L.The ambulance service and primary referral hospital in the Australian Capital Territory from 1st July 2014 to 30th (...) June 2015.Adult patients (≥18 years) who had pLA measured and were transported to the primary referral hospital.Mortality, admission, and duration of hospital stay.Two hundred fifty-three patients with a median pLA of 2.5 mmol/L (interquartile range [IQR]: 1.5-3.7) were analysed. Overall mortality was 8.3%; 68% were admitted to the hospital; 8.3% to the intensive care unit (ICU). pLA was non-significantly higher in those who died compared to survivors (3.5 [IQR: 2.75-5.85] vs 2.4 [1.5-3.6]; W

2018 Australian Critical Care

35. A prospective measure of unintended pregnancy in the United States. (PubMed)

A prospective measure of unintended pregnancy in the United States. To describe a new measure, the unintended pregnancy risk index (UPRI), which is based primarily on attitudinal and behavioral measures of women's prospective pregnancy desire, and compare it to the unintended pregnancy rate, typically calculated retrospectively.We used three rounds of the National Survey of Family Growth to calculate trends in the UPRI and compare it to the retrospective rate. The UPRI estimates the annual risk (...) and the effectiveness of the methods used all contributed to the decline in the UPRI.The sufficiency of retrospective measures of pregnancy intention has been challenged, and data availability has constrained needed surveillance of the unintended pregnancy rate. The UPRI offers a new measure that can be calculated with existing national surveillance data or for any population for which data on prospective pregnancy desire, pregnancy risk and contraceptive use are available.Copyright © 2018 The Authors. Published

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2018 Contraception

36. Measurement of Physiological Monitor Alarm Accuracy and Clinical Relevance in Intensive Care Units. (PubMed)

Measurement of Physiological Monitor Alarm Accuracy and Clinical Relevance in Intensive Care Units. Alarm fatigue threatens patient safety by delaying or reducing clinician response to alarms, which can lead to missed critical events. Interventions to reduce alarms without jeopardizing patient safety target either inaccurate or clinically irrelevant alarms, so assessment of alarm accuracy and clinical relevance may enhance the rigor of alarm intervention studies done in clinical units.To (1 (...) ) examine approaches used to measure accuracy and/or clinical relevance of physiological monitor alarms in intensive care units and (2) compare the proportions of inaccurate and clinically irrelevant alarms.An integrative review was used to systematically search the literature and synthesize resulting articles.Twelve studies explicitly measuring alarm accuracy and/or clinical relevance on a clinical unit were identified. In the most rigorous studies, alarms were annotated retrospectively by obtaining

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2018 American Journal of Critical Care

37. Postural Stability Evaluation of Patients Undergoing Vestibular Schwannoma Microsurgery Employing the Inertial Measurement Unit (PubMed)

Postural Stability Evaluation of Patients Undergoing Vestibular Schwannoma Microsurgery Employing the Inertial Measurement Unit The article focuses on a noninvasive method and system of quantifying postural stability of patients undergoing vestibular schwannoma microsurgery. Recent alternatives quantifying human postural stability are rather limited. The major drawback is that the posturography system can evaluate only two physical quantities of body movement and can be measured only (...) on a transverse plane. A complex movement pattern can be, however, described more precisely while using three physical quantities of 3-D movement. This is the reason why an inertial measurement unit (Xsens MTx unit), through which we obtained 3-D data (three Euler angles or three orthogonal accelerations), was placed on the patient's trunk. Having employed this novel method based on the volume of irregular polyhedron of 3-D body movement during quiet standing, it was possible to evaluate postural stability

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2018 Journal of healthcare engineering

38. Applying preventive measures leading to significant reduction of catheter-associated urinary tract infections in adult intensive care unit (PubMed)

Applying preventive measures leading to significant reduction of catheter-associated urinary tract infections in adult intensive care unit To determine the impact of applying the best available clinical evidence on the preventive measures to reduce the rate of catheter-associated urinary tract infections (CAUTI) in adult intensive care units (ICU).     Methods:  Data were collected from adult ICUs (28 beds) from 2008 to 2016. The proper use of silicon catheter, aseptic insertion technique

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2018 Saudi medical journal

39. Variation of poorly ventilated lung units (silent spaces) measured by electrical impedance tomography to dynamically assess recruitment (PubMed)

Variation of poorly ventilated lung units (silent spaces) measured by electrical impedance tomography to dynamically assess recruitment Assessing alveolar recruitment at different positive end-expiratory pressure (PEEP) levels is a major clinical and research interest because protective ventilation implies opening the lung without inducing overdistention. The pressure-volume (P-V) curve is a validated method of assessing recruitment but reflects global characteristics, and changes (...) at the regional level may remain undetected. The aim of the present study was to compare, in intubated patients with acute hypoxemic respiratory failure (AHRF) and acute respiratory distress syndrome (ARDS), lung recruitment measured by P-V curve analysis, with dynamic changes in poorly ventilated units of the dorsal lung (dependent silent spaces [DSSs]) assessed by electrical impedance tomography (EIT). We hypothesized that DSSs might represent a dynamic bedside measure of recruitment.We carried out

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2018 Critical Care

40. Validity of shoe-type inertial measurement units for Parkinson’s disease patients during treadmill walking (PubMed)

Validity of shoe-type inertial measurement units for Parkinson’s disease patients during treadmill walking When examining participants with pathologies, a shoe-type inertial measurement unit (IMU) system with sensors mounted on both the left and right outsoles may be more useful for analysis and provide better stability for the sensor positions than previous methods using a single IMU sensor or attached to the lower back and a foot. However, there have been few validity analyses of shoe-type (...) step length, left step time, and right step time showed excellent agreement between the shoe-type IMU and motion capture systems.The shoe-type IMU system provides reliable data and can be an alternative measurement tool for objective gait analysis of patients with PD in a clinical environment.

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2018 Journal of neuroengineering and rehabilitation

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