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Jacek Kurzawski, Agnieszka Janion-Sadowska, Andrzej Gackowski, Marianna Janion, Łukasz Zandecki, Magdalena Chrapek, Marcin Sadowski
To determine the left atrial longitudinal strain discrimination threshold of atrial fibrillation (AF) in patients with dilated cardiomyopathy (DCM). A total of 100 DCM patients and LVEF < 25% were included. Of them, 50 had sinus rhythm (SR), and 50 had AF. Patients with significant valvular disease, cardiac pacemakers and prosthetic valves were excluded. Speckle tracking echocardiography was performed to visualize the inferior and lateral walls of the left atrium as well as the interatrial septum. The Q-Analysis software was used to assess left atrial contractile strain (εCT ) during the atrial systole and left atrial conduit strain (εCD ) during the atrial filling...
October 19, 2018: International Journal of Cardiovascular Imaging
Fábio Leitão, Eurico Moreira, Filipe Alves, Mário Lourenço, Olga Azevedo, João Gaspar, Luis A Rocha
Several devices and measurement approaches have recently been developed to perform ballistocardiogram (BCG) and seismocardiogram (SCG) measurements. The development of a wireless acquisition system (hardware and software), incorporating a novel high-resolution micro-electro-mechanical system (MEMS) accelerometer for SCG and BCG signals acquisition and data treatment is presented in this paper. A small accelerometer, with a sensitivity of up to 0.164 µs/µg and a noise density below 6.5 µg/ Hz is presented and used in a wireless acquisition system for BCG and SCG measurement applications...
October 13, 2018: Sensors
Kei Takase
Recent introduction of multidetector-row computed tomography(MDCT) with more than 64 scanners enabled high-speed scanning in wide range of the body. Electrocardiogram (ECG) gated scanning and 4-dimensional imaging provides precise evaluation of cardiac and vascular diseases. Fine vascular structures such as the artery of Adamkiewicz can be visualized due to improved spatial and temporal resolution of CT and magnetic resonance imaging(MRI). Interventional radiology also plays important roles in combination with surgical treatment...
September 2018: Kyobu Geka. the Japanese Journal of Thoracic Surgery
Yong-Guang Wang, Zhi-Hua Shen, Xuan-Chen Wu
In the present study, we developed a methamphetamine (METH)-related virtual social environment to elicit subjective craving and physiological reactivity. Sixty-one male patients who were abstinent from METH use and 45 age-matched healthy males (i.e., normal controls) were recruited. The physiological electrocardiogram (ECG) signals were recorded before (resting-state condition) and during viewing of a METH-cue video in the virtual environment (cue-induced condition). The cue-induced subjective craving was measured with a visual analogue scale (VAS) for patients with METH dependence...
October 2, 2018: Psychiatry Research
Saagar Sanghvi, Fahad Waqar, Mohamed Effat
The incidence of acute myocardial infarction in the setting of acute pancreatitis is very rare. The recognition of such complex diagnosis may be clinically challenging, as the symptoms of both conditions are often indistinguishable. We report a case in which we encountered both conditions concurrently, and hypothesize that the ambient inflammatory and pro-thrombotic milieu of acute pancreatitis resulted in acute coronary thrombosis despite the absence of significant coronary atherosclerosis. Among multiple coronary imaging modalities currently in use, optimal cohesion tomography provided a unique capability for direct visualization of the coronary thrombus...
September 29, 2018: Journal of Thrombosis and Thrombolysis
Taleb Askaripoor, Majid Motamedzadeh, Rostam Golmohammadi, Maryam Farhadian, Mohammad Babamiri, Mehdi Samavati
Fatigue and sleepiness are one of the main causes of human errors and accidents in the workplace. The empirical evidence has approved that, in addition to stimulating the visual system, light elicits brain responses, which affect physiological and neurobehavioral human functions, known as the non-image forming (NIF) effects of light. As recent evidences have shown the positive effects of red or low correlated color temperature white light on alertness and performance, we investigated whether exposure to 2564 K light could improve subjective and objective measures of alertness and performance compared with 7343 K, 3730 K, and dim light (DL) conditions during the daytime...
September 12, 2018: Journal of Circadian Rhythms
Siddharth Siddharth, Aashish Patel, Tzyy-Ping Jung, Terry Sejnowski
Multi-modal bio-sensing has recently been used as effective research tools in affective computing, autism, clinical disorders, and virtual reality among other areas. However, none of the existing bio-sensing systems support multi-modality in a wearable manner outside well-controlled laboratory environments with research-grade measurements. This work attempts to bridge this gap by developing a wearable multi-modal bio-sensing system capable of collecting, synchronizing, recording and transmitting data from multiple bio-sensors: PPG, EEG, eye-gaze headset, body motion capture, GSR, etc...
September 4, 2018: IEEE Transactions on Bio-medical Engineering
Zbynek Tudos, Tomas Skala, Martin Homola, Ondrej Moravec, Milos Taborsky, Martin Kocher, Marie Cerna, Filip Ctvrtlik, Frantisek Odstrcil, Katerina Langova, Olga Klementova
BACKGROUND: The role of ECG-gating in left atrium (LA) computed tomography (MDCT) imaging is not precisely defined. METHODS AND RESULTS: 62 patients were randomized according to ECG gating with prospective evaluation of image quality, Volume CT Dose Index, Dose Length Product, Effective Dose and registration error between anatomical map and MDCT. We found significant difference in all radiation variables, but not in visual quality, registration error, CA duration, CA fluoroscopy time and CA fluoroscopy dose...
August 28, 2018: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
Loriano Galeotti, Christopher G Scully
OBJECTIVE: Recordings of signal noise and artifacts can be added to clean electrocardiogram (ECG) records to assess the performance of ECG and arrhythmia analysis algorithms in the presence of noise. We present a method to estimate device-specific signal noise and artifacts from ECG records. This method can be applied to obtain noise estimates from healthy subjects on any ECG lead, allowing a simple device-specific recording. The proposed approach is assessed using the MIT-BIH Noise Stress Test Database recordings combined with simulated ECGs...
August 18, 2018: Journal of Electrocardiology
Lei Feng, Yongliang Yang, Xiaokui Huo, Xiangge Tian, Yujie Feng, Hanwen Yuan, Lijian Zhao, Chao Wang, Peng Chu, Feida Long, Wei Wang, Xiaochi Ma
β-Glucuronidase (GLU) as a vital factor in enterohepatic circulation and drug-inducing enteropathy has been given more and more attention in recent years. In this study, an off-on near-infrared (NIR) fluorescent probe (DDAO-glu) for selectively and sensitively sensing GLU was developed on the basis of its substrate preference. DDAO-glu can rapidly and selectively respond to bacterial GLU under physiological conditions for detecting the real-time intestinal GLU bioactivity of complex biological systems such as human feces in clinic...
September 28, 2018: ACS Sensors
Medhat Farwati, Faris Shaker, Maher M Nasser
BACKGROUND Anomalous origin of the right coronary artery from the pulmonary artery (ARCAPA) is a rare congenital anomaly with an incidence of 0.002%. CASE REPORT A 58-year-old African American female with a history of diabetes mellitus, hyperlipidemia, and hypertension was evaluated for shortness of breath and chest heaviness. On physical examination, she was found to be morbidly obese. Her blood pressure was 160/90 mmHg. There were no carotid bruits or jugular venous distension. Cardiac auscultation showed distant heart sounds with no audible murmurs...
August 22, 2018: American Journal of Case Reports
Xiaomao Fan, Qihang Yao, Yunpeng Cai, Fen Miao, Fangmin Sun, Ye Li
Atrial fibrillation (AF) is one of the most common sustained chronic cardiac arrhythmia in elderly population, associated with a high mortality and morbidity in stroke, heart failure, coronary artery disease, systemic thromboembolism, etc. The early detection of AF is necessary for averting the possibility of disability or mortality. However, AF detection remains problematic due to its episodic pattern. In this paper, a multi-scaled fusion of deep convolutional neural network (MSCNN) is proposed to screen out AF recordings from single lead short ECG recordings...
August 7, 2018: IEEE Journal of Biomedical and Health Informatics
Wei Wei, Qingxuan Jia, Yongli Feng, Gang Chen
Emotion recognition is an important pattern recognition problem that has inspired researchers for several areas. Various data from humans for emotion recognition have been developed, including visual, audio, and physiological signals data. This paper proposes a decision-level weight fusion strategy for emotion recognition in multichannel physiological signals. Firstly, we selected four kinds of physiological signals, including Electroencephalography (EEG), Electrocardiogram (ECG), Respiration Amplitude (RA), and Galvanic Skin Response (GSR)...
2018: Computational Intelligence and Neuroscience
Annemarijn Sm Steijlen, Kaspar Mb Jansen, Armagan Albayrak, Derk O Verschure, Diederik F Van Wijk
BACKGROUND: Cardiovascular diseases (CVD) are the leading cause of morbidity and mortality worldwide. Early diagnosis is of pivotal importance for patients with cardiac arrhythmias and ischemia to minimize the consequences like strokes and myocardial infarctions. The chance of capturing signals of arrhythmias or ischemia is substantially high when a 12-lead electrocardiogram (ECG) can be recorded at the moment when a patient experiences the symptoms. However, until now, available diagnostic systems (Holter monitors and other wearable ECG sensors) have not enabled patients to record a reliable 12-lead ECG at home...
July 30, 2018: JMIR MHealth and UHealth
Manish Sharma, Ru San Tan, U Rajendra Acharya
Myocardial infarction (MI), also referred to as heart attack, occurs when there is an interruption of blood flow to parts of the heart, due to the acute rupture of atherosclerotic plaque, which leads to damage of heart muscle. The heart muscle damage produces changes in the recorded surface electrocardiogram (ECG). The identification of MI by visual inspection of the ECG requires expert interpretation, and is difficult as the ECG signal changes associated with MI can be short in duration and low in magnitude...
July 23, 2018: Computers in Biology and Medicine
Lucia Baratto, Sonya Youngju Park, Negin Hatami, Praveen Gulaka, Shreyas Vasanawala, Thomas Koshy Yohannan, Robert Herfkens, Ronald Witteles, Andrei Iagaru
BACKGROUND: Florbetaben, a 18 F-labeled stilbene derivative (Neuraceq®, formerly known as BAY-949172), is a diagnostic radiopharmaceutical developed to visualize β-amyloid plaques in the brain. Here, we report a pilot study evaluating patients with suspected cardiac amyloidosis for systemic extent of disease. METHODS: We prospectively enrolled nine patients, 61-86 year old (mean ± SD 69.4 ± 8.6), referred from the cardiac amyloid clinic. First, dynamic imaging of the heart was acquired immediately after injection of 222-318...
July 24, 2018: EJNMMI Research
Marcello Chiocchi, Marco Forcina, Daniele Morosetti, Luca Pugliese, Armando Ugo Cavallo, Daniele Citraro, Vincenzo De Stasio, Matteo Presicce, Roberto Floris, Francesco Romeo
AIM: The aim of our study is to show the importance of multislice computed tomography (CT) assessment in the overall management and diagnostic framework of transcatheter aortic valve replacement (TAVI) procedure candidates. METHODS: Between June 2015 and April 2017, 200 patients with severe aortic stenosis, not eligible for surgery, were enrolled, as defined by EuroSCORE; they were submitted to TAVI at the interventional cardiology department of the Tor Vergata Polyclinic...
October 2018: Journal of Cardiovascular Medicine
B M Burton, K K Aras, W W Good, J D Tate, B Zenger, R S MacLeod
BACKGROUND: Computational models of myocardial ischemia often use oversimplified ischemic source representations to simulate epicardial potentials. The purpose of this study was to explore the influence of biophysically justified, subject-specific ischemic zone representations on epicardial potentials. METHODS: We developed and implemented an image-based simulation pipeline, using intramural recordings from a canine experimental model to define subject-specific ischemic regions within the heart...
July 2018: Journal of Electrocardiology
Shu Lih Oh, Eddie Y K Ng, Ru San Tan, U Rajendra Acharya
Arrhythmia is a cardiac conduction disorder characterized by irregular heartbeats. Abnormalities in the conduction system can manifest in the electrocardiographic (ECG) signal. However, it can be challenging and time-consuming to visually assess the ECG signals due to the very low amplitudes. Implementing an automated system in the clinical setting can potentially help expedite diagnosis of arrhythmia, and improve the accuracies. In this paper, we propose an automated system using a combination of convolutional neural network (CNN) and long short-term memory (LSTM) for diagnosis of normal sinus rhythm, left bundle branch block (LBBB), right bundle branch block (RBBB), atrial premature beats (APB) and premature ventricular contraction (PVC) on ECG signals...
June 5, 2018: Computers in Biology and Medicine
Susana Rodrigues, Joana S Paiva, Duarte Dias, Marta Aleixo, Rui Manuel Filipe, João Paulo S Cunha
Stress can impact multiple psychological and physiological human domains. In order to better understand the effect of stress on cognitive performance, and whether this effect is related to an autonomic response to stress, the Trier Social Stress Test (TSST) was used as a testing platform along with a 2-Choice Reaction Time Task. When considering the nature and importance of Air Traffic Controllers (ATCs) work and the fact that they are subjected to high levels of stress, this study was conducted with a sample of ATCs ( n = 11)...
May 26, 2018: International Journal of Environmental Research and Public Health
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