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1.
PLoS One ; 15(4): e0230722, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32271788

RESUMO

With the rapid development of informatization, an increasing number of industries and organizations outsource their data to cloud servers, to avoid the cost of local data management and to share data. For example, industrial Internet of things systems and mobile healthcare systems rely on cloud computing's powerful data storage and processing capabilities to address the storage, provision, and maintenance of massive amounts of industrial and medical data. One of the major challenges facing cloud-based storage environments is how to ensure the confidentiality and security of outsourced sensitive data. To mitigate these issues, He et al. and Ma et al. have recently independently proposed two certificateless public key searchable encryption schemes. In this paper, we analyze the security of these two schemes and show that the reduction proof of He et al.'s CLPAEKS scheme is incorrect, and that Ma et al.'s CLPEKS scheme is not secure against keyword guessing attacks. We then propose a channel-free certificateless searchable public key authenticated encryption (dCLPAEKS) scheme and prove that it is secure against inside keyword guessing attacks under the enhanced security model. Compared with other certificateless public key searchable encryption schemes, this scheme has higher security and comparable efficiency.


Assuntos
Computação em Nuvem/normas , Segurança Computacional/normas , Armazenamento e Recuperação da Informação , Internet das Coisas , Setor Público , Algoritmos , Confidencialidade , Gerenciamento de Dados/métodos , Gerenciamento de Dados/organização & administração , Gerenciamento de Dados/normas , Eficiência Organizacional , Registros Eletrônicos de Saúde/organização & administração , Registros Eletrônicos de Saúde/normas , Troca de Informação em Saúde/normas , Humanos , Armazenamento e Recuperação da Informação/métodos , Armazenamento e Recuperação da Informação/normas , Internet das Coisas/organização & administração , Internet das Coisas/normas , Serviços Terceirizados/organização & administração , Serviços Terceirizados/normas , Setor Público/organização & administração , Setor Público/normas , Tecnologia sem Fio/organização & administração , Tecnologia sem Fio/normas
2.
Proc Natl Acad Sci U S A ; 117(11): 5624-5630, 2020 03 17.
Artigo em Inglês | MEDLINE | ID: mdl-32132209

RESUMO

Motivated by applications in wireless networks and the Internet of Things, we consider a model of n nodes trying to reach consensus with high probability on their majority bit. Each node i is assigned a bit at time 0 and is a finite automaton with m bits of memory (i.e., [Formula: see text] states) and a Poisson clock. When the clock of i rings, i can choose to communicate and is then matched to a uniformly chosen node j. The nodes j and i may update their states based on the state of the other node. Previous work has focused on minimizing the time to consensus and the probability of error, while our goal is minimizing the number of communications. We show that, when [Formula: see text], consensus can be reached with linear communication cost, but this is impossible if [Formula: see text] A key step is to distinguish when nodes can become aware of knowing the majority bit and stop communicating. We show that this is impossible if their memory is too low.


Assuntos
Consenso , Internet das Coisas/normas , Modelos Teóricos , Armazenamento e Recuperação da Informação/normas , Tecnologia sem Fio/normas
4.
J Med Syst ; 43(11): 324, 2019 Oct 16.
Artigo em Inglês | MEDLINE | ID: mdl-31620895

RESUMO

Real-time and ubiquitous patient monitoring demands the use of wireless data acquisition through resource constrained medical sensors, mostly configured with No-input No-output (NiNo) capabilities. Bluetooth is one of the most popular and widely adopted means of communicating this sensed information to a mobile terminal. However, over simplified implementations of Bluetooth low energy (BLE) protocol in eHealth sector is susceptible to several wireless attacks, in particular the Man-in-the-Middle (MITM) attack. The issue arises due to a lack of mutual authentication and integrity protection between the communicating devices, which may lead to compromise of confidentiality, availability and even the integrity of this safety-critical information. This research paper presents a novel framework named MARC to detect, analyze, and mitigate Bluetooth security flaws while focusing upon MITM attack against NiNo devices. For this purpose, a comprehensive solution has been proposed, which can detect MITM signatures based upon four novel anomaly detection metrics: analyzing Malicious scan requests, Advertisement intervals, RSSI levels, and Cloned node addresses. The proposed solution has been evaluated through practical implementation and demonstration of different attack scenarios, which show promising results concerning accurate and efficient detection of MITM attacks.


Assuntos
Redes de Comunicação de Computadores/organização & administração , Segurança Computacional/normas , Telemedicina/organização & administração , Tecnologia sem Fio/organização & administração , Redes de Comunicação de Computadores/normas , Confidencialidade/normas , Humanos , Telemedicina/normas , Tecnologia sem Fio/normas
5.
J Therm Biol ; 83: 112-118, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31331509

RESUMO

Wireless measurement of rectal temperature during exercise may circumvent some limitations associated with the use of a conventional wired probe. We determined, for the first time, whether temperatures provided in vivo by wireless ingestible thermometric telemetric pills and a rectal probe compare favorably under conditions producing slow and rapid increases and decreases in rectal temperature. While wearing a rectal probe linked to a wireless ingestible thermometric telemetric pill, 13 participants completed the following phases: 1) 30 min sitting; 2) 45 min passive heat exposure (40-42 °C); 3) 45 min sitting while ingesting 7.5 g of ice slurry · kg body mass-1; 4) running exercise (38 °C) at 68% V˙O2max until a 39.5 °C increase in rectal probe temperature and; 5) cold-water (10 °C) immersion until a 1.5 °C decrease in rectal probe temperature. Acceptable differences between devices were taken as ≤ 0.3 °C. Mean differences within phases were all < 0.3 °C, whereas 95% limits of agreement ranged from ±0.2 °C to ±0.4 °C, coefficient of variations from ±0.3% to ±0.6% and typical error of measurements from ±0.1 °C to ±0.2°. Of the 14881 rectal temperature values measured over the experiment with the wireless ingestible thermometric telemetric pills and rectal probe, 91% of the differences between devices were found to be ≤ 0.3 °C. Results suggest that rectal temperatures provided by a wireless ingestible thermometric telemetric pill used as a suppository agree with those of a conventional wired probe. Hence, rectal temperature can reliably be measured using a wireless ingestible thermometric telemetric pill as a suppository.


Assuntos
Temperatura Corporal , Exercício Físico , Telemetria/métodos , Termometria/métodos , Adulto , Feminino , Temperatura Alta , Humanos , Masculino , Reto/fisiologia , Telemetria/efeitos adversos , Telemetria/normas , Termometria/efeitos adversos , Termometria/normas , Tecnologia sem Fio/normas
6.
Am J Health Syst Pharm ; 76(17): 1281-1287, 2019 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-31325354

RESUMO

PURPOSE: Results of a questionnaire-based study to evaluate smart infusion pump end users' perceptions and understanding of the drug library update process are reported. METHODS: The Indianapolis Coalition for Patient Safety, Inc., in partnership with the Regenstrief Center for Healthcare Engineering, conducted a 33-item electronic, cross-sectional survey across 5 Indiana health systems from May through November 2017. Interdisciplinary participants identified for survey distribution included nurses, pharmacists, biomedical engineers, administrators, and medication safety officers. The survey assessed the following domains: patient safety, the drug library update process, knowledge of drug libraries and the update process, and end-user perceptions. RESULTS: A total of 778 submitted surveys were included in the data analysis, with a large majority of responses (90.2%) provided by nurses. The use of drug libraries for ensuring patient safety was deemed extremely important or important by 88% of respondents, but 36% indicated that they were unsure of whether drug libraries are updated on a routine basis in their health system. Approximately two-thirds agreed that the current update process improves quality of care (65.0%) and patient safety (68.1%). Moreover, 53.3% agreed that the current drug library update process was effective. However, less than 10% responded correctly when asked about the steps required to update the drug library. Furthermore, only 18% correctly indicated that when a pump is on it may not necessarily contain the most up-to-date version of the drug library. CONCLUSION: A survey of 5 health systems in Indianapolis identified several end-user knowledge gaps related to smart pump drug library updates. The results suggest that these gaps were most likely due to a combination of the 2-step update process and the fact that the current drug library version is not easy to find and/or user-friendly and it is unclear when an update is pending.


Assuntos
Bombas de Infusão/normas , Erros de Medicação/prevenção & controle , Recursos Humanos em Hospital/estatística & dados numéricos , Tecnologia sem Fio/normas , Estudos Transversais , Hospitais , Humanos , Indiana , Estudos Interdisciplinares , Inquéritos e Questionários
7.
Toxicol Pathol ; 47(5): 598-611, 2019 07.
Artigo em Inglês | MEDLINE | ID: mdl-31117895

RESUMO

The recent development of mouse cages equipped with monitoring wireless technology raised questions on the potential effects on animals induced by electromagnetic fields (EMFs) generated by electronic boards positioned underneath the cages. The aims of this study were to characterize the EMF produced by digitally ventilated cages (DVC) and perform a clinicopathological study on mice maintained in DVC for up to 1 year. The EMFs were measured in empty individually ventilated cages (IVC) and DVC. Male (n = 160) and female (n = 160) C57BL/6NCrl mice were randomly housed in IVC and DVC in a single rack, 4 mice per cage. Body weight and food and water consumption were recorded at 14-day intervals. At sacrifice (days 60, 120, 180, and 365), body and testes weight was measured, and necropsy, hematology, bone marrow cytology, histology, and immunohistochemistry for cleaved-caspase 3 on the testes were performed. Digitally ventilated cages produced extremely low-intensity electric fields ranging from 5 Hz to 3 GHz. No exposure-related clinical signs and mortality occurred. Occasional statistical differences in body weight, food and water consumption, hematology, bone marrow, and histopathology were recorded, but considered without biological or clinical relevance. In conclusion, long-term maintenance in DVC had no definite effects on C57BL/6NCrl mice.


Assuntos
Campos Eletromagnéticos , Abrigo para Animais/normas , Tecnologia sem Fio/normas , Animais , Campos Eletromagnéticos/efeitos adversos , Planejamento Ambiental , Camundongos Endogâmicos C57BL , Ventilação
8.
J Med Syst ; 43(5): 115, 2019 Mar 23.
Artigo em Inglês | MEDLINE | ID: mdl-30905047

RESUMO

Location-based services (LBS) and information security is a major concern in communication system.With the increasing popularity of location based services more attention is paid to preserve location information to protect the data. In order to protect and preserve the MANET and location based services, there are various existing location based anonymity protocols such as k-anonymity location based, but these protocols are more overhead due to the dynamic mobility nature of ad-hoc networks. In this paper we proposed an Adaptive Risk Prediction and Anonymous Secured Communication protocol to predict the risk before processing anonymous communication. The proposed protocol estimates the risk against adjacent nodes and estimates the vulnerability paths using hidden markov model and decision tree. The decision tree determines the evidence to identify the trusted paths. The anonymous communication message authentication scheme assigns the anonymous communication and organize the secured authentication scheme. We simulated the network by considering different attacks to determine the efficiency of Adaptive Risk Prediction and Anonymous Secured Communication using NS2 simulator.


Assuntos
Segurança Computacional/normas , Árvores de Decisões , Aplicações da Informática Médica , Tecnologia sem Fio/normas , Humanos , Cadeias de Markov , Medição de Risco
9.
Scand J Clin Lab Invest ; 79(1-2): 1-6, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30882250

RESUMO

Extensive research has been devoted to developing methods for assessing core body temperature, and to determine which method is most accurate. A number of wireless dermal thermometers for home use are presently available, but their relation to core body temperature and suitability for use in clinical research has hitherto not been assessed. The current study aimed to evaluate such thermometers by comparing them to the results of a rectal thermometer. Four wireless dermal thermometers for home use (FeverSmart, iThermonitor, Quest Temp Sitter, and Thermochron iButton) were applied to 15 patients during 24 h, and rectal temperature was measured at four occasions. Pearson correlation revealed moderate correlation for the Feversmart (r = 0.75), iThermonitor (r = 0.79), and Thermochron iButton (r = 0.71) systems. The Quest Temp Sitter system malfunctioned repeatedly, and the correlation (r = 0.29) for this method should therefore be assessed with caution. All dermal thermometers rendered lower average temperatures than Terumo c405 (Feversmart -0.70 ± 0.65 °C; iThermonitor -0.77 ± 0.53 °C, Quest Temp Sitter -1.18 ± 0.66 °C, and Thermochron iButton -0.87 ± 0.65 °C). Sensitivity of the dermal thermometers for detecting core temperatures ≥38.0 °C was low, ranging from 0.33 to 0.6, but improved to 0.60 to 0.80 after adjusting temperatures by the methods' average deviation from rectal temperature. The results from the dermal thermometers tested here showed an insufficient correlation to core temperature to be used for core temperature monitoring in clinical research and practice. Unfortunately, other options for non-invasive temperature measurements are few. The two thermometers with the least unsatisfactory performance profile in our evaluations were the Feversmart and iThermonitor systems.


Assuntos
Temperatura Corporal , Febre/diagnóstico , Termômetros/estatística & dados numéricos , Tecnologia sem Fio/estatística & dados numéricos , Idoso , Idoso de 80 Anos ou mais , Feminino , Febre/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Reto/fisiopatologia , Sensibilidade e Especificidade , Pele/fisiopatologia , Tecnologia sem Fio/normas
10.
Rev. cuba. inform. méd ; 10(2)jul.-dic. 2018. graf
Artigo em Espanhol | CUMED | ID: cum-74115

RESUMO

Introducción: Los avances tecnológicos alcanzados en relación con las comunicaciones y la información se vieron potenciados luego de la incorporación de la Web 2.00 y el networking impactando las redes y comunidades virtuales. Los dispositivos con tecnología inalámbrica han impactado la eficacia en las comunicaciones, que facilitan el desarrollo de tareas diversas, ventajosas por su repercusión en la economía, imagen y competitividad. El acceso a dispositivos inteligentes se ha extendido en la población ecuatoriana, donde se trabaja por el reconocimiento a los derechos de los pueblos y comunidades indígenas al respeto de sus culturas, tradiciones, costumbres, valores, saberes y formas de vida, siendo Otavalo una de las ciudades de mayor presencia indígena del país. Objetivo: Exponer cómo incorporar la tecnología en lo cotidiano con fines sociales, así como también potenciar el desarrollo y los emprendimientos locales. Metodología A partir de entrevistar al Coordinador Cantonal de las comunidades indígenas otavaleñas, interesado en divulgar e impulsar el desarrollo local, se le explica de las facilidades que brinda la herramienta de la Red Local inalámbrica Kimera, que utiliza software libre y contenido abierto. Luego de un intercambio con la comunidad de Gualsaqui se obtiene el consentimiento y se completa la información de su interés a divulgarse. Conclusiones Se conforma una red local inalámbrica que constituye una propuesta para la divulgación de la historia, sistema legal y datos de la comunidad, información que es de fácil actualización por no exigir de conocimientos técnicos específicos para su personalización(AU)


Introduction: Technological progress in relation to communications and information were boosted after incorporating Web 2.00 and networking impacting networks and virtual communities. Devices with wireless technology have impacted the effectiveness of communications, which facilitate the development of diverse tasks, advantageous for their impact on the economy, image and competitiveness. Access to smart devices has spread throughout the Ecuadorian population, where work is being done to recognize the rights of indigenous peoples and communities to respect their cultures, traditions, customs, values, knowledge and ways of life, Otavalo being one of the the cities with the greatest indigenous presence in the country. Objective To show how to incorporate technology in daily life with social purposes, as well as to promote development and local enterprises. Methodology After interviewing the Cantonal Coordinator of the Otavalo indigenous communities, interested in spreading and promoting local development, he is explained about the facilities offered by the Kimera Wireless Local Network tool, which uses free software and open content. After an exchange with the community of Gualsaqui, consent is obtained and the information of interest to be disseminated is complemented. Conclusions A wireless local network is installed that constitutes a proposal for the disclosure of the history, legal system and community data, information that is easy to update because it does not require specific technical knowledge for its customization(AU)


Assuntos
Humanos , Grupos Populacionais , Desenvolvimento Local , Tecnologia sem Fio/normas , Equador
11.
Rev. cuba. inform. méd ; 10(2): e08, jul.-dic. 2018. graf
Artigo em Espanhol | LILACS | ID: biblio-1003901

RESUMO

Introducción Los avances tecnológicos alcanzados en relación con las comunicaciones y la información se vieron potenciados luego de la incorporación de la Web 2.00 y el networking impactando las redes y comunidades virtuales. Los dispositivos con tecnología inalámbrica han impactado la eficacia en las comunicaciones, que facilitan el desarrollo de tareas diversas, ventajosas por su repercusión en la economía, imagen y competitividad. El acceso a dispositivos inteligentes se ha extendido en la población ecuatoriana, donde se trabaja por el reconocimiento a los derechos de los pueblos y comunidades indígenas al respeto de sus culturas, tradiciones, costumbres, valores, saberes y formas de vida, siendo Otavalo una de las ciudades de mayor presencia indígena del país. Objetivo Exponer cómo incorporar la tecnología en lo cotidiano con fines sociales, así como también potenciar el desarrollo y los emprendimientos locales. Metodología A partir de entrevistar al Coordinador Cantonal de las comunidades indígenas otavaleñas, interesado en divulgar e impulsar el desarrollo local, se le explica de las facilidades que brinda la herramienta de la Red Local inalámbrica Kimera, que utiliza software libre y contenido abierto. Luego de un intercambio con la comunidad de Gualsaqui se obtiene el consentimiento y se completa la información de su interés a divulgarse. Conclusiones Se conforma una red local inalámbrica que constituye una propuesta para la divulgación de la historia, sistema legal y datos de la comunidad, información que es de fácil actualización por no exigir de conocimientos técnicos específicos para su personalización(AU)


Introduction Technological progress in relation to communications and information were boosted after incorporating Web 2.00 and networking impacting networks and virtual communities. Devices with wireless technology have impacted the effectiveness of communications, which facilitate the development of diverse tasks, advantageous for their impact on the economy, image and competitiveness. Access to smart devices has spread throughout the Ecuadorian population, where work is being done to recognize the rights of indigenous peoples and communities to respect their cultures, traditions, customs, values, knowledge and ways of life, Otavalo being one of the the cities with the greatest indigenous presence in the country. Objective To show how to incorporate technology in daily life with social purposes, as well as to promote development and local enterprises. Methodology After interviewing the Cantonal Coordinator of the Otavalo indigenous communities, interested in spreading and promoting local development, he is explained about the facilities offered by the Kimera Wireless Local Network tool, which uses free software and open content. After an exchange with the community of Gualsaqui, consent is obtained and the information of interest to be disseminated is complemented. Conclusions A wireless local network is installed that constitutes a proposal for the disclosure of the history, legal system and community data, information that is easy to update because it does not require specific technical knowledge for its customization(AU)


Assuntos
Humanos , Grupos Populacionais , Desenvolvimento Local , Tecnologia sem Fio/normas , Equador
12.
Am J Health Syst Pharm ; 75(15): 1140-1144, 2018 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-29950393

RESUMO

PURPOSE: Results of a study to estimate the prevalence and severity of delays in wireless updates of smart-pump drug libraries across a large group of U.S. hospitals are reported. METHODS: A prolonged smart-pump drug library update may result in patient harm if a pump is programmed with an incorrect limit setting at the time of drug administration. A retrospective study was conducted using smart-pump alert data extracted from the Regenstrief National Center for Medical Device Informatics (REMEDI) database. The study sample consisted of 49 hospitals in 5 states across the Midwest and Kentucky operated by 12 health systems; all the facilities used a specific brand of smart pump (BD Alaris, Beckton, Dickinson and Company) capable of generating alert data and had consistently contributed alert data to the REMEDI database over a 2-year period. An update delay was defined as the interval from the time a drug library version was replaced to the time of the last infusion alert triggered by the previous version during the study period. RESULTS: Of the 12 health systems, 11 were found to have had drug library update delays during the study period, with delay medians ranging from 22 to 192 days. The overall delay minimum and maximum durations were 0 and 661 days. CONCLUSION: Substantial delays in completion of wireless updates of smart-pump drug libraries were common across a group of hospitals of various sizes.


Assuntos
Bombas de Infusão/normas , Sistemas de Registro de Ordens Médicas/normas , Erros de Medicação/prevenção & controle , Sistemas de Medicação no Hospital/normas , Tecnologia sem Fio/normas , Bases de Dados Factuais/normas , Segurança de Equipamentos/normas , Humanos , Bombas de Infusão/efeitos adversos , Prevalência , Estudos Retrospectivos , Fatores de Tempo
13.
Technol Health Care ; 26(S1): 3-18, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29689752

RESUMO

BACKGROUND: Knowledge of the location of sensor devices is crucial for many medical applications of wireless body area networks, as wearable sensors are designed to monitor vital signs of a patient while the wearer still has the freedom of movement. However, clinicians or patients can misplace the wearable sensors, thereby causing a mismatch between their physical locations and their correct target positions. An error of more than a few centimeters raises the risk of mistreating patients. OBJECTIVE: The present study aims to develop a scheme to calculate and detect the position of wearable sensors without beacon nodes. METHODS: A new scheme was proposed to verify the location of wearable sensors mounted on the patient's body by inferring differences in atmospheric air pressure and received signal strength indication measurements from wearable sensors. Extensive two-sample t tests were performed to validate the proposed scheme. RESULTS: The proposed scheme could easily recognize a 30-cm horizontal body range and a 65-cm vertical body range to correctly perform sensor localization and limb identification. CONCLUSIONS: All experiments indicate that the scheme is suitable for identifying wearable sensor positions in an indoor environment.


Assuntos
Algoritmos , Monitorização Fisiológica/instrumentação , Monitorização Fisiológica/normas , Posicionamento do Paciente/normas , Dispositivos Eletrônicos Vestíveis/normas , Tecnologia sem Fio/instrumentação , Tecnologia sem Fio/normas , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Guias como Assunto , Humanos , Masculino , Pessoa de Meia-Idade
14.
Mil Med ; 183(suppl_1): 111-118, 2018 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-29635573

RESUMO

Objective: To determine if physicians trained in ultrasound interpretation perceive a difference in image quality and usefulness between Extended Focused Assessment with Sonography ultrasound examinations performed at bedside in a hospital vs. by emergency medical technicians minimally trained in medical ultrasound on a moving ambulance and transmitted to the hospital via a novel wireless system. In particular, we sought to demonstrate that useful images could be obtained from patients in less than optimal imaging conditions; that is, while they were in transport. Methods: Emergency medical technicians performed the examinations during transport of blunt trauma patients. Upon patient arrival at the hospital, a bedside Extended Focused Assessment with Sonography examination was performed by a physician. Both examinations were recorded and later reviewed by physicians trained in ultrasound interpretation. Results: Data were collected on 20 blunt trauma patients over a period of 13 mo. Twenty ultrasound-trained physicians blindly compared transmitted vs. bedside images using 11 Questionnaire for User Interaction Satisfaction scales. Four paired samples t-tests were conducted to assess mean differences between ratings for ambulatory and base images. Conclusion: Although there is a slight tendency for the average rating across all subjects and raters to be slightly higher in the base than in the ambulatory condition, none of these differences are statistically significant. These results suggest that the quality of the ambulatory images was viewed as essentially as good as the quality of the base images.


Assuntos
Ambulâncias , Serviços Médicos de Emergência/normas , Ultrassonografia/instrumentação , Tecnologia sem Fio/instrumentação , Tecnologia sem Fio/normas , Ferimentos não Penetrantes/diagnóstico por imagem , Serviços Médicos de Emergência/métodos , Humanos , Processamento de Imagem Assistida por Computador/normas , Ultrassonografia/métodos , Tecnologia sem Fio/estatística & dados numéricos , Ferimentos não Penetrantes/diagnóstico
15.
BMJ Open ; 8(2): e020162, 2018 02 27.
Artigo em Inglês | MEDLINE | ID: mdl-29487076

RESUMO

BACKGROUND AND OBJECTIVES: Intermittent vital signs measurements are the current standard on hospital wards, typically recorded once every 8 hours. Early signs of deterioration may therefore be missed. Recent innovations have resulted in 'wearable' sensors, which may capture patient deterioration at an earlier stage. The objective of this study was to determine whether a wireless 'patch' sensor is able to reliably measure respiratory and heart rate continuously in high-risk surgical patients. The secondary objective was to explore the potential of the wireless sensor to serve as a safety monitor. DESIGN: In an observational methods comparisons study, patients were measured with both the wireless sensor and bedside routine standard for at least 24 hours. SETTING: University teaching hospital, single centre. PARTICIPANTS: Twenty-five postoperative surgical patients admitted to a step-down unit. OUTCOME MEASURES: Primary outcome measures were limits of agreement and bias of heart rate and respiratory rate. Secondary outcome measures were sensor reliability, defined as time until first occurrence of data loss. RESULTS: 1568 hours of vital signs data were analysed. Bias and 95% limits of agreement for heart rate were -1.1 (-8.8 to 6.5) beats per minute. For respiration rate, bias was -2.3 breaths per minute with wide limits of agreement (-15.8 to 11.2 breaths per minute). Median filtering over a 15 min period improved limits of agreement of both respiration and heart rate. 63% of the measurements were performed without data loss greater than 2 min. Overall data loss was limited (6% of time). CONCLUSIONS: The wireless sensor is capable of accurately measuring heart rate, but accuracy for respiratory rate was outside acceptable limits. Remote monitoring has the potential to contribute to early recognition of physiological decline in high-risk patients. Future studies should focus on the ability to detect patient deterioration on low care environments and at home after discharge.


Assuntos
Monitorização Fisiológica/instrumentação , Dispositivos Eletrônicos Vestíveis , Tecnologia sem Fio/normas , Adulto , Idoso , Feminino , Frequência Cardíaca , Unidades Hospitalares , Hospitalização , Hospitais de Ensino , Humanos , Masculino , Pessoa de Meia-Idade , Países Baixos , Sistemas Automatizados de Assistência Junto ao Leito , Reprodutibilidade dos Testes , Taxa Respiratória , Sinais Vitais , Adulto Jovem
17.
Anesth Analg ; 126(3): 833-838, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29293176

RESUMO

BACKGROUND: Core temperature can be accurately measured from the esophagus or nasopharynx during general anesthesia, but neither site is suitable for neuraxial anesthesia. We therefore determined the precision and accuracy of a novel wireless axillary thermometer, the iThermonitor, to determine its suitability for use during neuraxial anesthesia and in other patients who are not intubated. METHODS: We enrolled 80 adults having upper abdominal surgery with endotracheal intubation. Intraoperative core temperature was measured in distal esophagus and was estimated at the axilla with a wireless iThermonitor WT701 (Raiing Medical, Boston MA) at 5-minute intervals. Pairs of axillary and reference distal esophageal temperatures were compared and summarized using linear regression and repeated-measured Bland-Altman methods. We a priori determined that the iThermonitor would have clinically acceptable accuracy if most estimates were within ±0.5°C of the esophageal reference, and suitable precision if the limits of agreement were within ±0.5°C. RESULTS: There were 3339 sets of paired temperatures. Axillary and esophageal temperatures were similar, with a mean difference (esophageal minus axillary) of only 0.14°C ± 0.26°C (standard deviation). The Bland-Altman 95% limits of agreement were reasonably narrow, with the estimated upper limit at 0.66°C and the lower limit at -0.38°C, thus ±0.52°C, indicating good agreement across the range of mean temperatures from 34.9°C to 38.1°C. The absolute difference was within 0.5°C in 91% of the measurements (95% confidence interval, 88%-93%). CONCLUSIONS: Axillary temperature, as recorded by the iThermonitor WT701, well represents core temperature in adults having noncardiac surgery and thus appears suitable for clinical use.


Assuntos
Axila/fisiologia , Temperatura Corporal/fisiologia , Monitorização Intraoperatória/instrumentação , Termômetros , Tecnologia sem Fio/instrumentação , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Monitorização Intraoperatória/normas , Termômetros/normas , Tecnologia sem Fio/normas
18.
PLoS One ; 12(7): e0180019, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28708840

RESUMO

This paper presents the precise dosimetry for highly resonant wireless power transfer (HR-WPT) system using an anatomically realistic human voxel model. The dosimetry for the HR-WPT system designed to operate at 13.56 MHz frequency, which one of the ISM band frequency band, is conducted in the various distances between the human model and the system, and in the condition of alignment and misalignment between transmitting and receiving circuits. The specific absorption rates in the human body are computed by the two-step approach; in the first step, the field generated by the HR-WPT system is calculated and in the second step the specific absorption rates are computed with the scattered field finite-difference time-domain method regarding the fields obtained in the first step as the incident fields. The safety compliance for non-uniform field exposure from the HR-WPT system is discussed with the international safety guidelines. Furthermore, the coupling factor concept is employed to relax the maximum allowable transmitting power. Coupling factors derived from the dosimetry results are presented. In this calculation, the external magnetic field from the HR-WPT system can be relaxed by approximately four times using coupling factor in the worst exposure scenario.


Assuntos
Fontes de Energia Elétrica/provisão & distribução , Campos Eletromagnéticos , Tecnologia sem Fio/normas , Humanos , Modelos Anatômicos , Radiometria
19.
J Med Syst ; 41(5): 72, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-28303432

RESUMO

The paper presents a network coded cooperative communication (NC-CC) enabled wireless hospital sensor network architecture for monitoring health as well as postural activities of a patient. A wearable device, referred as a smartband is interfaced with pulse rate, body temperature sensors and an accelerometer along with wireless protocol services, such as Bluetooth and Radio-Frequency transceiver and Wi-Fi. The energy efficiency of wearable device is improved by embedding a linear acceleration based transmission duty cycling algorithm (NC-DRDC). The real-time demonstration is carried-out in a hospital environment to evaluate the performance characteristics, such as power spectral density, energy consumption, signal to noise ratio, packet delivery ratio and transmission offset. The resource sharing and energy efficiency features of network coding technique are improved by proposing an algorithm referred as network coding based dynamic retransmit/rebroadcast decision control (LA-TDC). From the experimental results, it is observed that the proposed LA-TDC algorithm reduces network traffic and end-to-end delay by an average of 27.8% and 21.6%, respectively than traditional network coded wireless transmission. The wireless architecture is deployed in a hospital environment and results are then successfully validated.


Assuntos
Sistemas de Comunicação no Hospital/organização & administração , Monitorização Fisiológica/métodos , Tecnologia sem Fio/normas , Sistemas de Comunicação no Hospital/normas , Humanos , Monitorização Fisiológica/instrumentação , Tecnologia sem Fio/instrumentação
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