Conferences related to Ischemic pain

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2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC)

The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE


2020 IEEE International Conference on Image Processing (ICIP)

The International Conference on Image Processing (ICIP), sponsored by the IEEE SignalProcessing Society, is the premier forum for the presentation of technological advances andresearch results in the fields of theoretical, experimental, and applied image and videoprocessing. ICIP 2020, the 27th in the series that has been held annually since 1994, bringstogether leading engineers and scientists in image and video processing from around the world.


2020 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

All areas of ionizing radiation detection - detectors, signal processing, analysis of results, PET development, PET results, medical imaging using ionizing radiation


ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

The ICASSP meeting is the world's largest and most comprehensive technical conference focused on signal processing and its applications. The conference will feature world-class speakers, tutorials, exhibits, and over 50 lecture and poster sessions.


2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)

The world's premiere conference in MEMS sensors, actuators and integrated micro and nano systems welcomes you to attend this four-day event showcasing major technological, scientific and commercial breakthroughs in mechanical, optical, chemical and biological devices and systems using micro and nanotechnology.The major areas of activity in the development of Transducers solicited and expected at this conference include but are not limited to: Bio, Medical, Chemical, and Micro Total Analysis Systems Fabrication and Packaging Mechanical and Physical Sensors Materials and Characterization Design, Simulation and Theory Actuators Optical MEMS RF MEMS Nanotechnology Energy and Power


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Periodicals related to Ischemic pain

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Biomedical Engineering, IEEE Transactions on

Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.


Engineering in Medicine and Biology Magazine, IEEE

Both general and technical articles on current technologies and methods used in biomedical and clinical engineering; societal implications of medical technologies; current news items; book reviews; patent descriptions; and correspondence. Special interest departments, students, law, clinical engineering, ethics, new products, society news, historical features and government.


Medical Imaging, IEEE Transactions on

Imaging methods applied to living organisms with emphasis on innovative approaches that use emerging technologies supported by rigorous physical and mathematical analysis and quantitative evaluation of performance.


Microwave Theory and Techniques, IEEE Transactions on

Microwave theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of microwaves.


Neural Networks, IEEE Transactions on

Devoted to the science and technology of neural networks, which disclose significant technical knowledge, exploratory developments, and applications of neural networks from biology to software to hardware. Emphasis is on artificial neural networks.


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Most published Xplore authors for Ischemic pain

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Xplore Articles related to Ischemic pain

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Frequency-domain analysis of arterial blood pressure: a probe for central nervous system activity

[1991] Proceedings Computers in Cardiology, 1991

Spontaneous, self-sustained arterial blood pressure oscillations (APO; Mayer- rhythm) were studied in dogs exposed to hypotension, hemorrhage, hypoxia, or cerebral ischemia. Frequency spectra analysis of APO revealed a large amplitude (15-30 mmHg), low frequency (0.04-0.06 Hz) component. Higher frequency peaks (f>0.1 Hz) of much lower power amplitude were associated with respiratory activity. These experimental pathophysiologic states resulted in the loss ...


Influence of 1B ischemic ventricular tissue on the automaticity of Purkinje fibers: A simulation study

2007 Computers in Cardiology, 2007

A computer model has been developed to study the electrical activity of a Purkinje fiber of 1.5 cm coupled to a regionally 1B ischemic ventricular fiber of 3 cm through a Purkinje-muscle resistance (R<sub>pvj</sub>). The ventricular fiber was composed of a 1B ischemic zone, a border zone and a normal zone of 1 cm each. To simulate ischemia, we altered ...


Multichannel MCG Systems with Optimum Combinations of Pickup Coils and Shielded Rooms

2007 Joint Meeting of the 6th International Symposium on Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, 2007

In order to provide optimum signal-to-noise ratios depending on the shielding conditions, we fabricated several multichannel magnetocardiogram systems with different types of pickup coils, magnetometer, first-order gradiometers and second-order gradiometers. The magnetocardiogram (MCG) systems were operated inside different magnetically shielded rooms, and signal-to-noise ratios were compared. The MCG systems have numbers of sensors in the range of 61-64, whose coverage ...


Inhibition of ICAM-mediated monocyte adhesion with a bioresponsive dextran-based conjugate

Proceedings of the Second Joint 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] [Engineering in Medicine and Biology, 2002

The polysaccharide dextran, prepared as a colloid suspension in physiological saline, is routinely used as a plasma extender or substitute for emergency treatment of massive blood and fluid loss in settings where blood and blood products are not readily available. The objective of this study is to develop a dextran-peptide conjugate that selectively self-assembles onto injured tissue surfaces to form ...


Dielectric properties of canine acute and chronic myocardial infarction at a cell relaxation spectrum. II. Theory

Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136), 1997

A new model of bulk myocardium dielectric properties as a composition of membrane covered cells modelled as infinite cylinders has been developed. This model utilizes the complex values of dielectric properties of the intracellular, extracellular media and the cellular membrane. The model was used to analyze the myocardial resistivity above and below the cell membrane relaxation spectrum in normal myocardium ...


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Educational Resources on Ischemic pain

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IEEE-USA E-Books

  • Frequency-domain analysis of arterial blood pressure: a probe for central nervous system activity

    Spontaneous, self-sustained arterial blood pressure oscillations (APO; Mayer- rhythm) were studied in dogs exposed to hypotension, hemorrhage, hypoxia, or cerebral ischemia. Frequency spectra analysis of APO revealed a large amplitude (15-30 mmHg), low frequency (0.04-0.06 Hz) component. Higher frequency peaks (f>0.1 Hz) of much lower power amplitude were associated with respiratory activity. These experimental pathophysiologic states resulted in the loss of broadband frequency spectra (observed in control studies) and the emergence of dominant bifurcating narrowband APO rhythms. The periodicities observed implicate a CNS-mediated neural pacemaker (i.e. sympathetic overdrive) in arterial pressure oscillations.<<ETX>>

  • Influence of 1B ischemic ventricular tissue on the automaticity of Purkinje fibers: A simulation study

    A computer model has been developed to study the electrical activity of a Purkinje fiber of 1.5 cm coupled to a regionally 1B ischemic ventricular fiber of 3 cm through a Purkinje-muscle resistance (R<sub>pvj</sub>). The ventricular fiber was composed of a 1B ischemic zone, a border zone and a normal zone of 1 cm each. To simulate ischemia, we altered several electrophysiological parameters of the Luo-Rudy action potential model (Lrd00). The aim of this study was to investigate the influence of 1B ischemic ventricular tissue on the automaticity of Purkinje cells and its role in ectopic activity that could provoke arrhythmias. Our study suggests that 1B ischemic ventricular tissue enhances automaticity of Purkinje fibers and could have an important role on the generation of ectopic action potentials near the Purkinje-muscle junctions. This phenomenon may be involved in the generation of ectopic activity and cardiac arrhythmias.

  • Multichannel MCG Systems with Optimum Combinations of Pickup Coils and Shielded Rooms

    In order to provide optimum signal-to-noise ratios depending on the shielding conditions, we fabricated several multichannel magnetocardiogram systems with different types of pickup coils, magnetometer, first-order gradiometers and second-order gradiometers. The magnetocardiogram (MCG) systems were operated inside different magnetically shielded rooms, and signal-to-noise ratios were compared. The MCG systems have numbers of sensors in the range of 61-64, whose coverage diameters are large enough to measure the MCG maps in a single position setting. Considering the high cost of Permalloy needed in the shielded room, combination of a second-order gradiometer system and a thin magnetically shielded room seems best choice for the detection of ischemia in noisy hospital environment, like emergency department.

  • Inhibition of ICAM-mediated monocyte adhesion with a bioresponsive dextran-based conjugate

    The polysaccharide dextran, prepared as a colloid suspension in physiological saline, is routinely used as a plasma extender or substitute for emergency treatment of massive blood and fluid loss in settings where blood and blood products are not readily available. The objective of this study is to develop a dextran-peptide conjugate that selectively self-assembles onto injured tissue surfaces to form a protective colloid barrier against trauma-induced systemic inflammatory cell damage to healthy tissues. Endothelial cells were treated in vitro with a CD11b/CD18 antagonist conjugated to dextran. This agonist peptide conjugated to dextran decreased monocyte adhesion to TNF /spl alpha/-activated endothelium more effectively than peptide alone. The scrambled version of the same peptide, conjugated and not, did not block monocyte adhesion in similarly activated endothelium. These studies indicate that an CD11b/CD18 antagonist dextran conjugate that is delivered introvascularly may limit organ damage following intestinal ischemia and reperfusion injury.

  • Dielectric properties of canine acute and chronic myocardial infarction at a cell relaxation spectrum. II. Theory

    A new model of bulk myocardium dielectric properties as a composition of membrane covered cells modelled as infinite cylinders has been developed. This model utilizes the complex values of dielectric properties of the intracellular, extracellular media and the cellular membrane. The model was used to analyze the myocardial resistivity above and below the cell membrane relaxation spectrum in normal myocardium and in acute and chronic infarction. This myocardium cell model gives reasonable qualitative explanation not only for the spectrum of normal myocardial resistance but also for observed changes in the spectrum of myocardial resistance in acute ischemia and chronic infarction based on the "volume fraction hypothesis". The contributions of intracellular, extracellular and cell membrane resistances to bulk myocardial resistance are frequency dependent. At frequencies below 0.2 MHz the intracellular contribution to bulk resistance is much smaller compared to the extracellular resistance and does not exceed 10-15%. At frequencies higher than 0.5 MHz the measured bulk resistance reflects extracellular and intracellular resistances at about the same order. The contribution of the cell membrane resistance is much smaller compared to the intracellular and extracellular resistances and does not exceed 0.1% at frequency near 1 Hz for normal myocardium.

  • Using models of the passive cardiac conductivity and full heart anisotropic bidomain to study the epicardial potentials in ischemia

    In this paper we present a multi-scale approach for cardiac modeling. Based on the histology of cardiac tissue we created a geometrical model at a cellular scale to compute the effective conductivity of a piece of cardiac tissue. In turn, the conductivity values obtained from this cellular scale model were used in a whole heart model in which we simulated regional, subendocardial ischemia. Histological changes at a cellular level led to changes in the effective conductivity tensor of the tissue, which in turn resulted in changes in the epicardial potential patterns during the ST-interval. Two effects were studied using this multi-scale approach: (1) the influence of a dynamically growing ischemic region on the epicardial potentials, and (2) the influence of a dynamically changing conductivity in the ischemic zone due to changes in the underlying pathology. One specific finding was the presence of epicardial patterns consisting of a central elevation and two opposite depressions at the edges of the ischemic zone which rotated as the ischemia became more transmural. In addition, the epicardial potentials decreased in magnitude with the duration of the ischemia due to changes in the effective conductivity of the ischemic tissue predicted by the cellular level model.

  • A medical decision making system for predicting the probability of cardiac events in patients with residual ischemia after uncomplicated acute myocardial infarction

    The goal was to develop an integrated consultative system, able to store data relative to patients' clinical history and noninvasive diagnostic tests, retrieve them and perform a statistical analysis, and finally present to the physician the probability of a future cardiac event for the individual patient, with a definite sensitivity and specificity. In the clinical scenario of residual ischemia at the exercise stress test performed prior to hospital discharge for a first acute myocardial infarction, the physician must take relevant management decisions, sometimes in the presence of confusing results of noninvasive techniques. A consultative system, based on a logistic regression analysis, was developed to assist the cardiologist in the interpretation of clinical data and provocative tests in this critical setting. This system allows a 91.7% correct classification of high or low risk patients for future cardiac events.<<ETX>>

  • Spatial characterization of ischemia in 12-lead ECG recordings during PCI using both depolarization and repolarization indices

    Spatial characterization of ischemia is addressed by evaluating ECG-derived indices: the ST level at J point plus 60 ms, ST<sub>J+60</sub>; S wave amplitude, S<sub>a</sub>; the upward and downward QRS slopes (I<sub>US</sub> and I<sub>DS</sub>); and high-frequency QRS in the band 150-250 Hz, HF- QRS<sub>(150-250)</sub> over 12-lead ECG signals recorded during prolonged elective PCI. Absolute changes of each index I during coronary occlusion, ¿I, and their relative changes, R<sub>I</sub>, were quantified. Mean R S<sub>TJ+60</sub>= 14.5, R<sub>Sa</sub>= 15.2 and R<sub>IDS</sub>= 6.2 times their normal variations in pre-PCI recordings, respectively, showed the most pronounced changes as well as a very similar and distinctive lead-profiles depending on the occlusion site. We conclude that the ECG-derived indices from the final part of the QRS complex show high sensitivity for detection of ischemia. Moreover, their spatial distributions show the largest changes in leads closest to the region adjacent to the occluded artery, which can be considered for occlusion site identification.

  • Problem-oriented access to clinical literature on acute cardiac ischemia

    A knowledge-based system which allows access to results of clinical studies for an individual patient with acute cardiac ischemia is described. The knowledge base contains 20 recent studies applicable to three periods of time in the hospital. An abstract model for the representation of the studies and a facility for consultations have been developed. The inference process includes the determination of a patient-specific decision context and the rule-based application of the studies. The consultation ends with an assorted list of relevant clinical events and their frequencies in groups which are similar to the patient under consideration. The system performed well with retrospective data.<<ETX>>

  • Development of a pH based tissue ischemia monitor: preliminary clinical results

    The objective of the authors' research is to develop a pH measuring system which will be used for accurate postoperative monitoring of transplanted tissue. Currently, most pH monitors that are used for this purpose are difficult to operate by hospital personnel and do not possess sufficient long- term stability, resulting in false readings of tissue pH. To resolve these problems, an electronic multi-channel pH measuring device, that interfaces with a laptop computer, was constructed. The system makes use of an algorithm to compensate for instabilities that are inherent to pH measurements. This is accomplished using separate pH reference electrode channels from which multiple measurements are taken and averaged. Preliminary tests show that this system accurately measures tissue pH and remains stable during the 96 hour postoperative monitoring period.



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