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https://www.readbyqxmd.com/read/29136608/variation-of-the-korotkoff-stethoscope-sounds-during-blood-pressure-measurement-analysis-using-a-convolutional-neural-network
#1
Fan Pan, Peiyu He, Chengyu Liu, Taiyong Li, Alan Murray, Dingchang Zheng
Korotkoff sounds are known to change their characteristics during blood pressure (BP) measurement, resulting in some uncertainties for systolic and diastolic pressure (SBP and DBP) determinations. The aim of this study was to assess the variation of Korotkoff sounds during BP measurement by examining all stethoscope sounds associated with each heartbeat from above systole to below diastole during linear cuff deflation. Three repeat BP measurements were taken from 140 healthy subjects (age 21 to 73 years; 62 female and 78 male) by a trained observer, giving 420 measurements...
November 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/29060920/automated-lung-sound-analysis-for-detecting-pulmonary-abnormalities
#2
Shreyasi Datta, Anirban Dutta Choudhury, Parijat Deshpande, Sakyajit Bhattacharya, Arpan Pal
Identification of pulmonary diseases comprises of accurate auscultation as well as elaborate and expensive pulmonary function tests. Prior arts have shown that pulmonary diseases lead to abnormal lung sounds such as wheezes and crackles. This paper introduces novel spectral and spectrogram features, which are further refined by Maximal Information Coefficient, leading to the classification of healthy and abnormal lung sounds. A balanced lung sound dataset, consisting of publicly available data and data collected with a low-cost in-house digital stethoscope are used...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060917/a-robust-dataset-agnostic-heart-disease-classifier-from-phonocardiogram
#3
Rohan Banerjee, Anirban Dutta Choudhury, Parijat Deshpande, Sakyajit Bhattacharya, Arpan Pal, K M Mandana
Automatic classification of normal and abnormal heart sounds is a popular area of research. However, building a robust algorithm unaffected by signal quality and patient demography is a challenge. In this paper we have analysed a wide list of Phonocardiogram (PCG) features in time and frequency domain along with morphological and statistical features to construct a robust and discriminative feature set for dataset-agnostic classification of normal and cardiac patients. The large and open access database, made available in Physionet 2016 challenge was used for feature selection, internal validation and creation of training models...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060901/novel-features-from-autocorrelation-and-spectrum-to-classify-phonocardiogram-quality
#4
Deepan Das, Rohan Banerjee, Anirban Dutta Choudhury, Sakyajit Bhattacharya, Parijat Deshpande, Arpan Pal, Kayapanda M Mandana
Phonocardiogram (PCG) or auscultation via a stethoscope forms the basis of preliminary medical screening. But PCG recorded in an uncontrolled environment is inherently noisy. In this paper we have derived novel features from the spectral domain and autocorrelation waveforms. These are used to identify the quality of a PCG recording and accepting only diagnosable quality recordings for further analysis. These features proved to be robust irrespective of variations in devices and in data collection protocols employed to ensure consistent data quality...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28930184/use-of-wavelet-transform-to-detect-compensated-and-decompensated-stages-in-the-congestive-heart-failure-patient
#5
Pratibha Sharma, Kimberly Newman, Carlin S Long, A J Gasiewski, Frank Barnes
This research work is aimed at improving health care, reducing cost, and the occurrence of emergency hospitalization in patients with Congestive Heart Failure (CHF) by analyzing heart and lung sounds to distinguish between the compensated and decompensated states. Compensated state defines stable state of the patient but with lack of retention of fluids in lungs, whereas decompensated state leads to unstable state of the patient with lots of fluid retention in the lungs, where the patient needs medication. Acoustic signals from the heart and the lung were analyzed using wavelet transforms to measure changes in the CHF patient's status from the decompensated to compensated and vice versa...
September 20, 2017: Biosensors
https://www.readbyqxmd.com/read/28883927/listening-panel-agreement-and-characteristics-of-lung-sounds-digitally-recorded-from-children-aged-1-59-months-enrolled-in-the-pneumonia-etiology-research-for-child-health-perch-case-control-study
#6
Eric D McCollum, Daniel E Park, Nora L Watson, W Chris Buck, Charatdao Bunthi, Akash Devendra, Bernard E Ebruke, Mounya Elhilali, Dimitra Emmanouilidou, Anthony J Garcia-Prats, Leah Githinji, Lokman Hossain, Shabir A Madhi, David P Moore, Justin Mulindwa, Dan Olson, Juliet O Awori, Warunee P Vandepitte, Charl Verwey, James E West, Maria D Knoll, Katherine L O'Brien, Daniel R Feikin, Laura L Hammit
INTRODUCTION: Paediatric lung sound recordings can be systematically assessed, but methodological feasibility and validity is unknown, especially from developing countries. We examined the performance of acoustically interpreting recorded paediatric lung sounds and compared sound characteristics between cases and controls. METHODS: Pneumonia Etiology Research for Child Health staff in six African and Asian sites recorded lung sounds with a digital stethoscope in cases and controls...
2017: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/28590447/left-right-asymmetry-in-spectral-characteristics-of-lung-sounds-detected-using-a-dual-channel-auscultation-system-in-healthy-young-adults
#7
Jang-Zern Tsai, Ming-Lang Chang, Jiun-Yue Yang, Dar Kuo, Ching-Hsiung Lin, Cheng-Deng Kuo
Though lung sounds auscultation is important for the diagnosis and monitoring of lung diseases, the spectral characteristics of lung sounds have not been fully understood. This study compared the spectral characteristics of lung sounds between the right and left lungs and between healthy male and female subjects using a dual-channel auscultation system. Forty-two subjects aged 18-22 years without smoking habits and any known pulmonary diseases participated in this study. The lung sounds were recorded from seven pairs of auscultation sites on the chest wall simultaneously...
June 7, 2017: Sensors
https://www.readbyqxmd.com/read/28508991/digital-stethoscopes-compared-to-standard-auscultation-for-detecting-abnormal-paediatric-breath-sounds
#8
Ajay C Kevat, Anaath Kalirajah, Robert Roseby
Our study aimed to objectively describe the audiological characteristics of wheeze and crackles in children by using digital stethoscope (DS) auscultation, as well as assess concordance between standard auscultation and two different DS devices in their ability to detect pathological breath sounds. Twenty children were auscultated by a paediatric consultant doctor and digitally recorded using the Littman™ 3200 Digital Electronic Stethoscope and a Clinicloud™ DS with smart device. Using spectrographic analysis, we found those with clinically described wheeze had prominent periodic waveform segments spanning expiration for a period of 0...
July 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/28488929/mobile-diagnostic-units-for-rural-patients-in-colombia
#9
Luis Fernando Cifuentes
BACKGROUND: The literature on the use of mobile diagnostic units for the adult population is limited. This is a report for the first time in Colombia (Latin America) on the use of mobile diagnostic units for patients in rural areas and resolution of complex cases through telemedicine. INTRODUCTION: Telemedicine is an alternative because it takes advantage of advances in telecommunications and technology for the provision of health services to patients in rural areas of a country...
May 10, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
https://www.readbyqxmd.com/read/28460759/utility-of-physical-examination-and-comparison-to-echocardiography-for-cardiac-diagnosis
#10
Ashish Patel, Nitin Singh Tomar, Anil Bharani
OBJECTIVE: To find out the accuracy of cardiac auscultation using non-digital stethoscope in physical diagnosis of cardiac diseases. METHODS: We enrolled 104 consecutive patients with abnormal cardiac auscultatory findings attending cardiology clinic and not previously evaluated by echocardiography. One time detailed cardiac physical examination followed by echocardiography within 1 month was undertaken. Agreement between two methods was calculated using mean pair percentage agreement, kappa statistics (κ) and calculation of 95% confidence interval (CI) for kappa statistics...
March 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/28269245/a-low-cost-3-d-printed-stethoscope-connected-to-a-smartphone
#11
Carlos Aguilera-Astudillo, Marx Chavez-Campos, Alan Gonzalez-Suarez, Jose L Garcia-Cordero
We demonstrate the fabrication of a digital stethoscope using a 3D printer and commercial off-the-shelf electronics. A chestpiece consists of an electret microphone embedded into the drum of a 3D printed chestpiece. An electronic dongle amplifies the signal from the microphone and reduces any external noise. It also adjusts the signal to the voltages accepted by the smartphones headset jack. A graphical user interface programmed in Android displays the signals processed by the dongle. The application also saves the processed signal and sends it to a physician...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227479/a-low-cost-3-d-printed-stethoscope-connected-to-a-smartphone
#12
Carlos Aguilera-Astudillo, Marx Chavez-Campos, Alan Gonzalez-Suarez, Jose L Garcia-Cordero, Carlos Aguilera-Astudillo, Marx Chavez-Campos, Alan Gonzalez-Suarez, Jose L Garcia-Cordero, Jose L Garcia-Cordero, Alan Gonzalez-Suarez, Marx Chavez-Campos
We demonstrate the fabrication of a digital stethoscope using a 3D printer and commercial off-the-shelf electronics. A chestpiece consists of an electret microphone embedded into the drum of a 3D printed chestpiece. An electronic dongle amplifies the signal from the microphone and reduces any external noise. It also adjusts the signal to the voltages accepted by the smartphones headset jack. A graphical user interface programmed in Android displays the signals processed by the dongle. The application also saves the processed signal and sends it to a physician...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28199732/a-systematic-review-of-novel-technology-for-monitoring-infant-and-newborn-heart-rate
#13
REVIEW
Ajay C Kevat, Denise V R Bullen, Peter G Davis, C Omar F Kamlin
Heart rate (HR) is a vital sign for assessing the need for resuscitation. We performed a systematic review of studies assessing novel methods of measuring HR in newborns and infants in the neonatal unit. Two investigators completed independent literature searches. Identified papers were independently evaluated, and relevant data were extracted and analysed. CONCLUSION: This systematic review identified seven new technologies, including camera-based photoplethysmography, reflectance pulse oximetry, laser Doppler methods, capacitive sensors, piezoelectric sensors, electromyography and a digital stethoscope...
May 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28150025/initial-field-test-of-a-cloud-based-cardiac-auscultation-system-to-determine-murmur-etiology-in-rural-china
#14
Lee Pyles, Pouya Hemmati, J Pan, Xiaoju Yu, Ke Liu, Jing Wang, Andreas Tsakistos, Bistra Zheleva, Weiguang Shao, Quan Ni
A system for collection, distribution, and long distant, asynchronous interpretation of cardiac auscultation has been developed and field-tested in rural China. We initiated a proof-of-concept test as a critical component of design of a system to allow rural physicians with little experience in evaluation of congenital heart disease (CHD) to obtain assistance in diagnosis and management of children with significant heart disease. The project tested the hypothesis that acceptable screening of heart murmurs could be accomplished using a digital stethoscope and internet cloud transmittal to deliver phonocardiograms to an experienced observer...
April 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28138529/epidermal-mechano-acoustic-sensing-electronics-for-cardiovascular-diagnostics-and-human-machine-interfaces
#15
Yuhao Liu, James J S Norton, Raza Qazi, Zhanan Zou, Kaitlyn R Ammann, Hank Liu, Lingqing Yan, Phat L Tran, Kyung-In Jang, Jung Woo Lee, Douglas Zhang, Kristopher A Kilian, Sung Hee Jung, Timothy Bretl, Jianliang Xiao, Marvin J Slepian, Yonggang Huang, Jae-Woong Jeong, John A Rogers
Physiological mechano-acoustic signals, often with frequencies and intensities that are beyond those associated with the audible range, provide information of great clinical utility. Stethoscopes and digital accelerometers in conventional packages can capture some relevant data, but neither is suitable for use in a continuous, wearable mode, and both have shortcomings associated with mechanical transduction of signals through the skin. We report a soft, conformal class of device configured specifically for mechano-acoustic recording from the skin, capable of being used on nearly any part of the body, in forms that maximize detectable signals and allow for multimodal operation, such as electrophysiological recording...
November 2016: Science Advances
https://www.readbyqxmd.com/read/27754183/hw-02-1-is-it-the-end-of-a-long-and-productive-era-the-future-of-the-mercury-sphygmomanometer-and-the-stethoscope
#16
Jinho Shin
Arterial pulsation which had long been studied for estimation of blood pressure or mean blood pressure was replaced by the measurement of systolic and diastolic blood pressure using Korotkoff sound detected by stethoscope in the beginning of the previous century. In the meantime, vast of modern knowledge of human hypertension from epidemiology to randomized clinical trial had been built on the Korotkoff sound and stethoscope methodology. Hypertension is very special clinical entity in terms of the diagnosis is solely dependent on the manual blood pressure measurement by a physician or nurse...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27659352/automated-signal-quality-assessment-of-mobile-phone-recorded-heart-sound-signals
#17
David B Springer, Thomas Brennan, Ntobeko Ntusi, Hassan Y Abdelrahman, Liesl J Zühlke, Bongani M Mayosi, Lionel Tarassenko, Gari D Clifford
Mobile phones, due to their audio processing capabilities, have the potential to facilitate the diagnosis of heart disease through automated auscultation. However, such a platform is likely to be used by non-experts, and hence, it is essential that such a device is able to automatically differentiate poor quality from diagnostically useful recordings since non-experts are more likely to make poor-quality recordings. This paper investigates the automated signal quality assessment of heart sound recordings performed using both mobile phone-based and commercial medical-grade electronic stethoscopes...
October 2016: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/27643140/hw-02-1-is-it-the-end-of-a-long-and-productive-era-the-future-of-the-mercury-sphygmomanometer-and-the-stethoscope
#18
Jinho Shin
Arterial pulsation which had long been studied for estimation of blood pressure or mean blood pressure was replaced by the measurement of systolic and diastolic blood pressure using Korotkoff sound detected by stethoscope in the beginning of the previous century. In the meantime, vast of modern knowledge of human hypertension from epidemiology to randomized clinical trial had been built on the Korotkoff sound and stethoscope methodology. Hypertension is very special clinical entity in terms of the diagnosis is solely dependent on the manual blood pressure measurement by a physician or nurse...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27613456/telemedicine-is-as-effective-as-in-person-visits-for-patients-with-asthma
#19
Jay M Portnoy, Morgan Waller, Stephen De Lurgio, Chitra Dinakar
BACKGROUND: Access to asthma specialists is a problem, particularly in rural areas, thus presenting an opportunity for management using telemedicine. OBJECTIVE: To compare asthma outcomes during 6 months in children managed by telemedicine vs in-person visits. METHODS: Children with asthma residing in 2 remote locations were offered the choice of an in-person visit or a telemedicine session at a local clinic. The telemedicine process involved real-time use of a Remote Presence Solution (RPS) equipped with a digital stethoscope, otoscope, and high-resolution camera...
September 2016: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/27566472/a-sneak-peek-into-digital-innovations-and-wearable-sensors-for-cardiac-monitoring
#20
REVIEW
Frederic Michard
Many mobile phone or tablet applications have been designed to control cardiovascular risk factors (obesity, smoking, sedentary lifestyle, diabetes and hypertension) or to optimize treatment adherence. Some have been shown to be useful but the long-term benefits remain to be demonstrated. Digital stethoscopes make easier the interpretation of abnormal heart sounds, and the development of pocket-sized echo machines may quickly and significantly expand the use of ultrasounds. Daily home monitoring of pulmonary artery pressures with wireless implantable sensors has been shown to be associated with a significant decrease in hospital readmissions for heart failure...
April 2017: Journal of Clinical Monitoring and Computing
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