scholarly journals Non-Invasive Fetal Monitoring: A Maternal Surface ECG Electrode Placement-Based Novel Approach for Optimization of Adaptive Filter Control Parameters Using the LMS and RLS Algorithms

Sensors ◽  
2017 ◽  
Vol 17 (5) ◽  
pp. 1154 ◽  
Author(s):  
Radek Martinek ◽  
Radana Kahankova ◽  
Homer Nazeran ◽  
Jaromir Konecny ◽  
Janusz Jezewski ◽  
...  
Keyword(s):  
Adaptive Filter ◽  
Fetal Monitoring ◽  
Electrode Placement ◽  
Control Parameters ◽  
Non Invasive ◽  
Novel Approach ◽  
Surface Ecg ◽  
Adaptive Filter Control

NON-INVASIVE BCI METHOD: EEG - ELECTROENCEPHALOGRAPHY

2019 ◽  
pp. 139-145
Author(s):  
Selma Büyükgöze
Keyword(s):  
Brain Computer Interface ◽  
Computer Interface ◽  
Electrode Placement ◽  
Eeg Signals ◽  
Non Invasive ◽  
Brain Signals ◽  
Brain States ◽  
The Brain

Brain Computer Interface consists of hardware and software that convert brain signals into action. It changes the nerves, muscles, and movements they produce with electro-physiological signs. The BCI cannot read the brain and decipher the thought in general. The BCI can only identify and classify specific patterns of activity in ongoing brain signals associated with specific tasks or events. EEG is the most commonly used non-invasive BCI method as it can be obtained easily compared to other methods. In this study; It will be given how EEG signals are obtained from the scalp, with which waves these frequencies are named and in which brain states these waves occur. 10-20 electrode placement plan for EEG to be placed on the scalp will be shown.

scholarly journals Tethered Lipid Membranes as a Nanoscale Arrangement Towards Non-Invasive Analysis of Acute Pancreatitis

Biomedicines ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 755
Author(s):  
Rima Budvytyte ◽  
Akvile Milasiute ◽  
Dalius Vitkus ◽  
Kestutis Strupas ◽  
Aiste Gulla ◽  
...  
Keyword(s):  
Acute Pancreatitis ◽  
Lipid Membranes ◽  
Electrochemical Impedance ◽  
Membrane Integrity ◽  
Electrochemical Technique ◽  
Label Free ◽  
Non Invasive ◽  
Novel Approach ◽  
Analytical System ◽  
Shock Proteins

Extracellular heat shock proteins (HSPs) mediate immunological functions and are involved in pathologies such as infection, stress, and cancer. Here, we demonstrated the dependence of an amount of HSP70 and HSP90 in serum vs. severity of acute pancreatitis (AP) on a cohort of 49 patients. Tethered bilayer lipid membranes (tBLMs) have been developed to investigate HSPs’ interactions with tBLMs that can be probed by electrochemical impedance spectroscopy (EIS). The results revealed that HSP70 and HSP90 interact via different mechanisms. HSP70 shows the damage of the membrane, while HSP90 increases the insulation properties of tBLM. These findings provide evidence that EIS offers a novel approach for the study of the changes in membrane integrity induced by HSPs proteins. Herein, we present an alternative electrochemical technique, without any immunoprobes, that allows for the monitoring of HSPs on nanoscaled tBLM arrangement in biologics samples such us human urine. This study demonstrates the great potential of tBLM to be used as a membrane based biosensor for novel, simple, and non-invasive label-free analytical system for the prediction of AP severity.

Spread of Excitation (SoE) — A Non-Invasive Assessment of Cochlear Implant Electrode Placement

2010 ◽  
Vol 11 (sup1) ◽  
pp. 479-481 ◽  
Author(s):  
Adam Walkowiak ◽  
Bozena Kostek ◽  
Artur Lorens ◽  
Anita Obrycka ◽  
Arkadiusz Wasowski ◽  
...  
Keyword(s):  
Cochlear Implant ◽  
Electrode Placement ◽  
Non Invasive ◽  
Spread Of Excitation

scholarly journals Accuracy of BIS monitoring using a novel interface device connecting conventional needle-electrodes and BIS sensors during frontal neurosurgical procedures

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0258647
Author(s):  
Hideki Harada ◽  
Seiya Muta ◽  
Tatsuyuki Kakuma ◽  
Misa Ukeda ◽  
So Ota ◽  
...  
Keyword(s):  
Mixed Model ◽  
Linear Mixed Model ◽  
Clinical Performance ◽  
Clinical Situation ◽  
Electrode Placement ◽  
Neurosurgical Procedures ◽  
Non Invasive ◽  
Invasive Method ◽  
Data Points ◽  
Interface Device

Background Bispectral index (BIS) monitoring is a widely used non-invasive method to monitor the depth of anesthesia. However, in the event of surgeries requiring a frontal approach, placement of the electrode may be impossible at the designated area to achieve a proper BIS measurement. Methods We developed an investigational interface device to connect needle-electrodes to BIS sensors. The safety and clinical performance were investigated in patients who underwent surgery. Direct BIS values from a disposable BIS electrode and indirect values via the interface device were simultaneously recorded from the same areas of electrode placement in a single patient. The agreement between the direct and indirect BIS values was statistically analyzed. Results The interface device with a silver electrode demonstrated sufficient electric conduction to transmit electroencephalogram signals. The overall BIS curves were similar to those of direct BIS monitoring. Direct and indirect BIS values from 18 patients were statistically analyzed using a linear mixed model and a significant concordance was confirmed (indirect BIS = 7.0405 + 0.8286 * direct BIS, p<0.0001). Most observed data (2582/2787 data points, 92.64%) had BIS unit differences of 10 or less. Conclusions The interface device provides an opportunity for intraoperative BIS monitoring of patients, whose clinical situation does not permit the placement of conventional adhesive sensors at the standard location.

scholarly journals Non-invasive Cardiac Radiation for Ablation of Ventricular Tachycardia: a New Therapeutic Paradigm in Electrophysiology

2018 ◽  
Vol 7 (1) ◽  
pp. 8 ◽  
Author(s):  
Eun-Jeong Kim ◽  
Giovanni Davogustto ◽  
William G Stevenson ◽  
Roy M John ◽  
◽  
...  
Keyword(s):  
Ventricular Tachycardia ◽  
Cardiac Tissue ◽  
Imaging Techniques ◽  
Case Series ◽  
Structural Heart Disease ◽  
Multicenter Studies ◽  
Invasive Approach ◽  
Non Invasive ◽  
Surface Ecg ◽  
Early Case

Non-invasive ablation of cardiac tissue to control ventricular tachycardia (VT) is a novel therapeutic consideration in the management of ventricular arrhythmias associated with structural heart disease. The technique involves the use of stereotactic radiotherapy delivered to VT substrates. Although invasive mapping can be used to identify the target, the use of non-invasive ECG and imaging techniques combined with multi-electrode body-surface ECG recordings offers the potential of a completely non-invasive approach. Early case series have demonstrated a consistent decrease in VT burden and sufficient early safety to allow more detailed multicenter studies. Such studies are currently in progress to further evaluate this promising technology.

Acceptance of a new non-invasive fetal monitoring system and attitude for telemedicine approaches in obstetrics: a case–control study

2018 ◽  
Vol 298 (6) ◽  
pp. 1085-1093 ◽  
Author(s):  
Katharina Schramm ◽  
Florian Lapert ◽  
Juliane Nees ◽  
Carlijn Lempersz ◽  
S. Guid Oei ◽  
...  
Keyword(s):  
Monitoring System ◽  
Case Control Study ◽  
Fetal Monitoring ◽  
Case Control ◽  
Non Invasive ◽  
Control Study

Non-Invasive Rhythmic Musical-Electric Trigeminal Nerve Stimulation Improves Consciousness in Patients with Disorders of Consciousness

2021 ◽  
Author(s):  
Min Wu ◽  
Benyan Luo ◽  
Yamei Yu ◽  
Xiaoxia Li ◽  
Jian Gao ◽  
...  
Keyword(s):  
Trigeminal Nerve ◽  
Nerve Stimulation ◽  
Brain Activity ◽  
Minimally Conscious State ◽  
Conscious State ◽  
Disorders Of Consciousness ◽  
Non Invasive ◽  
Trigeminal Nerve Stimulation ◽  
Novel Approach ◽  
Minimally Conscious

Abstract Disorders of consciousness (DOC) are often accompanied by aberrant oscillatory neural activity in the thalamus and cerebral cortex. Patient-friendly non-invasive treatments targeting this functional anomaly are still missing. We propose and validate a novel approach that aims to restore DOC patients’ thalamocortical oscillations by combining rhythmic trigeminal-nerve stimulation (TNS) with comodulated musical stimulation. In a cluster-randomized, placebo-controlled, double-blinded, pretest-posttest clinical study, we show that application of this multisensory approach for 40 min on five consecutive days reliably leads to long-lasting improvements in DOC patients’ consciousness (assessed with Coma Recovery Scale-Revised) and oscillatory brain activity at the musical-electric TNS frequency (assessed with electroencephalography and a novel rhythmic auditory-speech paradigm). We found diagnostic improvement in 47% of patients in minimally conscious state and a positive relationship between patients’ behavioral and neural improvements. Based on this evidence we argue that non-invasive musical-electric TNS may serve as an effective patient-friendly DOC treatment and suggest frequency-specific oscillatory neural enhancement as its mode of action.

Non-invasive predictors for infranodal conduction delay in patients with left bundle branch block after TAVR

2021 ◽  
Author(s):  
Chloé Auberson ◽  
Patrick Badertscher ◽  
Antonio Madaffari ◽  
Meriton Malushi ◽  
Luc Bourquin ◽  
...  
Keyword(s):  
Left Bundle Branch Block ◽  
Predictive Value ◽  
Conduction Delay ◽  
Bundle Branch Block ◽  
Non Invasive ◽  
Transcatheter Aortic Valve ◽  
Increased Risk ◽  
Surface Ecg ◽  
Pr Interval ◽  
Electrocardiographic Parameters

Abstract Aims Left bundle branch block (LBBB) is the most common conduction disorder after transcatheter aortic valve replacement (TAVR) with an increased risk of atrioventricular (AV) block. The aim of the current study was to identify non-invasive predictors for infranodal conduction delay in patients with LBBB. Methods We analyzed consecutive patients undergoing TAVR with pre-existing or new-onset LBBB between August 2014 and August 2020. His ventricular (HV) interval measurement was performed on day 1 after TAVR. Baseline, procedural, as well as surface and intracardiac electrocardiographic parameters were included. Infranodal conduction delay was defined as HV interval > 55 ms. Results Of 825 patients screened after TAVR, 151 patients (82 ± 6 years, 39% male) with LBBB were included. Among these, infranodal conduction delay was observed in 25%. ΔPR (difference in PR interval after and before TAVR), PR and QRS duration after TAVR were significantly longer in the group with HV prolongation. In a multivariate analysis in patients with sinus rhythm (n = 123), ΔPR (OR per 10 ms increase: 1.52; 95%CI: 1.19–2.01; p = 0.002) was the only independent factor associated with infranodal conduction delay. A change in PR interval by 20 ms yielded a specificity of 83% and a sensitivity of 46%, with a negative predictive value of 84% and a positive predictive value of 45% to predict HV prolongation. Conclusions Simple analysis of surface ECG and a calculated ΔPR < 20 ms can be used as predictor for the absence of infranodal conduction delay in post-TAVR patients with LBBB. Graphical abstract

scholarly journals A Sensor Platform for Athletes’ Training Supervision: A Proof of Concept Study

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3948 ◽  
Author(s):  
Zompanti ◽  
Sabatini ◽  
Santonico ◽  
Grasso ◽  
Gianfelici ◽  
...  
Keyword(s):  
Least Squares Method ◽  
Maximal Oxygen Consumption ◽  
Lactate Concentration ◽  
Carbon Dioxide Production ◽  
Exhaled Breath ◽  
Non Invasive ◽  
Sport Practice ◽  
Novel Approach ◽  
Respiratory Parameters ◽  
Partial Least Squares Method

One of the basic needs of professional athletes is the real-time and non-invasive monitoring of their activities. The use of these kind of data is necessary to develop strategies for specific tailored training in order to improve performances. The sensor system presented in this work has the aim to adopt a novel approach for the monitoring of physiological parameters, and athletes’ performances, during their training. The anaerobic threshold is herein identified with the monitoring of the lactate concentration and the respiratory parameters. The data collected by the sensor are used to build a model using a supervised method (based on the partial least squares method, PLS) to predict the values of the parameters of interest. The sensor is able to measure the lactate concentration from a sample of saliva and it can estimate a respiratory parameter, such as maximal oxygen consumption, maximal carbon dioxide production and respiratory rate from a sample of exhaled breath. The main advantages of the device are the low power; the wireless communication; and the non-invasive sampling method, which allow its use in a real context of sport practice.

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