Recording of regional electrophysiological information by analysis of surface potentials to give a complete picture of the effects of the currents from the heart on the body surface. It has been applied to the diagnosis of old inferior myocardial infarction, localization of the bypass pathway in Wolff-Parkinson-White syndrome, recognition of ventricular hypertrophy, estimation of the size of a myocardial infarct, and the effects of different interventions designed to reduce infarct size. The limiting factor at present is the complexity of the recording and analysis, which requires 100 or more electrodes, sophisticated instrumentation, and dedicated personnel. (Braunwald, Heart Disease, 4th ed)
Recording of the moment-to-moment electromotive forces of the heart on a plane of the body surface delineated as a vector function of time.
Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
An alkaloid found in the root of RAUWOLFIA SERPENTINA, among other plant sources. It is a class Ia antiarrhythmic agent that apparently acts by changing the shape and threshold of cardiac action potentials.
An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.
NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).
Narrowing or constriction of a coronary artery.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
One of the three polypeptide chains that make up the TROPONIN complex. It is a cardiac-specific protein that binds to TROPOMYOSIN. It is released from damaged or injured heart muscle cells (MYOCYTES, CARDIAC). Defects in the gene encoding troponin T result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.
Dilation of an occluded coronary artery (or arteries) by means of a balloon catheter to restore myocardial blood supply.
A scale that assesses the outcome of serious craniocerebral injuries, based on the level of regained social functioning.
The restoration of the sequential order of contraction and relaxation of the HEART ATRIA and HEART VENTRICLES by atrio-biventricular pacing.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.
Types of artificial pacemakers with implantable leads to be placed at multiple intracardial sites. They are used to treat various cardiac conduction disturbances which interfere with the timing of contraction of the ventricles. They may or may not include defibrillating electrodes (IMPLANTABLE DEFIBRILLATORS) as well.
A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).
A form of heart block in which the electrical stimulation of HEART VENTRICLES is interrupted at either one of the branches of BUNDLE OF HIS thus preventing the simultaneous depolarization of the two ventricles.
Implantable devices which continuously monitor the electrical activity of the heart and automatically detect and terminate ventricular tachycardia (TACHYCARDIA, VENTRICULAR) and VENTRICULAR FIBRILLATION. They consist of an impulse generator, batteries, and electrodes.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
Collections of systematically acquired and organized information resources, and usually providing assistance to users. (ERIC Thesaurus, http://www.eric.ed.gov/ accessed 2/1/2008)
A nonmetallic element with atomic symbol C, atomic number 6, and atomic weight [12.0096; 12.0116]. It may occur as several different allotropes including DIAMOND; CHARCOAL; and GRAPHITE; and as SOOT from incompletely burned fuel.
A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.
The ability to detect scents or odors, such as the function of OLFACTORY RECEPTOR NEURONS.
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
Conferences, conventions or formal meetings usually attended by delegates representing a special field of interest.
Societies whose membership is limited to physicians.
An island in the Gulf of St. Lawrence constituting a province of Canada in the eastern part of the country. It is very irregular in shape with many deep inlets. Its capital is Charlottetown. Discovered by the French in 1534 and originally named Ile Saint-Jean, it was renamed in 1799 in honor of Prince Edward, fourth son of George III and future father of Queen Victoria. (From Webster's New Geographical Dictionary, 1988, p981 & Room, Brewer's Dictionary of Names, 1992, p433)
Studies beyond the bachelor's degree at an institution having graduate programs for the purpose of preparing for entrance into a specific field, and obtaining a higher degree.
The study of the heart, its physiology, and its functions.
"The business or profession of the commercial production and issuance of literature" (Webster's 3d). It includes the publisher, publication processes, editing and editors. Production may be by conventional printing methods or by electronic publishing.
Visualization of the heart structure and cardiac blood flow for diagnostic evaluation or to guide cardiac procedures via techniques including ENDOSCOPY (cardiac endoscopy, sometimes refered to as cardioscopy), RADIONUCLIDE IMAGING; MAGNETIC RESONANCE IMAGING; TOMOGRAPHY; or ULTRASONOGRAPHY.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
The ENTERIC NERVOUS SYSTEM; PARASYMPATHETIC NERVOUS SYSTEM; and SYMPATHETIC NERVOUS SYSTEM taken together. Generally speaking, the autonomic nervous system regulates the internal environment during both peaceful activity and physical or emotional stress. Autonomic activity is controlled and integrated by the CENTRAL NERVOUS SYSTEM, especially the HYPOTHALAMUS and the SOLITARY NUCLEUS, which receive information relayed from VISCERAL AFFERENTS.
Unexpected rapid natural death due to cardiovascular collapse within one hour of initial symptoms. It is usually caused by the worsening of existing heart diseases. The sudden onset of symptoms, such as CHEST PAIN and CARDIAC ARRHYTHMIAS, particularly VENTRICULAR TACHYCARDIA, can lead to the loss of consciousness and cardiac arrest followed by biological death. (from Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 7th ed., 2005)
The hollow, muscular organ that maintains the circulation of the blood.
The measurement of magnetic fields generated by electric currents from the heart. The measurement of these fields provides information which is complementary to that provided by ELECTROCARDIOGRAPHY.
The study and practice of medicine by direct examination of the patient.
The study of MAGNETIC PHENOMENA.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
Pathophysiological conditions of the FETUS in the UTERUS. Some fetal diseases may be treated with FETAL THERAPIES.
Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.
Determination of the nature of a pathological condition or disease in the postimplantation EMBRYO; FETUS; or pregnant female before birth.
The teaching staff and members of the administrative staff having academic rank in a medical school.
The teaching staff and members of the administrative staff having academic rank in an educational institution.
Practice of a health profession by an individual, offering services on a person-to-person basis, as opposed to group or partnership practice.
Educational institutions.
The teaching staff and members of the administrative staff having academic rank in a dental school.
The teaching staff and members of the administrative staff having academic rank in a nursing school.
A course of study offered by an educational institution.

Clinical application of an integrated 3-phase mapping technique for localization of the site of origin of idiopathic ventricular tachycardia. (1/507)

BACKGROUND: Radiofrequency (RF) catheter ablation provides curative treatment for idiopathic ventricular tachycardia (VT). METHODS AND RESULTS: Nineteen consecutive patients with an idiopathic VT underwent RF catheter ablation. An integrated 3-phase mapping approach was used, consisting of the successive application of online 62-lead body surface QRS integral mapping, directed regional paced body surface QRS integral mapping, and local activation sequence mapping. Mapping phase 1 was localization of the segment of VT origin by comparing the VT QRS integral map with a database of mean paced QRS integral maps. Mapping phase 2 was body surface pace mapping during sinus rhythm in the segment localized in phase 1 until the site at which the paced QRS integral map matched the VT QRS integral map was identified (ie, VT exit site). Mapping phase 3 was local activation sequence mapping at the circumscribed area identified in phase 2 to identify the site with the earliest local endocardial activation (ie, site of VT origin). This site became the ablation target. Ten VTs were ablated in the right ventricular outflow tract, 2 at the basal LV septum, and 7 at the midapical posterior left ventricle. A high long-term ablation success (mean follow-up duration, 14+/-9 months) was achieved in 17 of the 19 patients (89%) with a low number of RF pulses (mean, 3.3+/-2.2 pulses per patient). CONCLUSIONS: This prospective study shows that integrated 3-phase mapping for localization of the site of origin of idiopathic VT offers efficient and accurate localization of the target site for RF catheter ablation.  (+info)

Ventricular excitation maps using tissue Doppler acceleration imaging: potential clinical application. (2/507)

OBJECTIVES: The purpose of this study is to validate the use of tissue Doppler acceleration imaging (TDAI) for evaluation of the onset of ventricular contraction in humans. BACKGROUND: Tissue Doppler acceleration imaging can display the distribution, direction and value of ventricular acceleration responses to myocardial contraction and electrical excitation. METHODS: Twenty normal volunteers underwent TDAI testing to determine the normal onset of ventricular acceleration. Two patients with paroxysmal supraventricular tachycardia and 30 patients with permanent pacemakers underwent introduction of esophageal and right ventricular pacing electrodes, respectively, and were studied to visualize the onset of pacer-induced ventricular acceleration. Eight patients with dual atrioventricular (AV) node and 20 patients with Wolff-Parkinson-White (WPW) syndrome underwent TDAI testing to localize the abnormal onset of ventricular acceleration, and the results were compared with those of intracardiac electrophysiology (ICEP) tests. RESULTS: The normal onset and the onset of dual AV node were localized at the upper interventricular septum (IVS) under the right coronary cusp within 25 ms before the beginning of the R wave in the electrocardiogram (ECG). In all patients in the pacing group, the location and timing of the onset conformed to the positions and timing of electrodes (100%). In patients with WPW syndrome, abnormal onset was localized to portions of the ventricular wall other than the upper IVS at the delta wave or within 25 ms after the delta wave in the ECG. The agreement was 90% (18 of 20) between the abnormal onset and the position of the accessory pathways determined by ICEP testing. CONCLUSIONS: These results suggest that TDAI is a useful noninvasive method that frequently is successful in visualizing the intramural site of origin of ventricular mechanical contraction.  (+info)

Dispersion of signal-averaged P wave duration on precordial body surface in patients with paroxysmal atrial fibrillation. (3/507)

AIMS: This study sought to investigate whether the spatial dispersion of signal-averaged P wave duration would be increased in patients with paroxysmal atrial fibrillation, by use of precordial mapping of the P wave signal-averaged ECG. METHODS AND RESULTS: The P wave signal-averaged ECG was recorded by the P wave-triggering method from 16 precordial leads in 55 patients with paroxysmal atrial fibrillation and 57 control subjects. As an index of the dispersion of signal-averaged P wave duration, we obtained the difference between the maximum and minimum in 16 recording sites. The dispersion was significantly greater in the patients with paroxysmal atrial fibrillation than the controls (26.6 +/- 9.5 vs 14.8 +/- 6.7 ms, P<0.0001). In 25 patients with symptomatic attacks of paroxysmal atrial fibrillation, the signal-averaged ECG was repeated 1 h after a single dose of orally administered pilsicainide, a new class Ic drug. These patients were prospectively followed-up for 10 +/- 11 months with pilsicainide. The rate of freedom from recurrence of paroxysmal atrial fibrillation attacks was significantly (P<0.0001) higher in patients with whom dispersion was decreased by the single dose (54%[7/13]) than in those in whom dispersion increased (8%[1/12]). CONCLUSION: Increased dispersion of signal-averaged P wave duration would play an important role in generating paroxysmal atrial fibrillation and would be useful in the prediction of drug efficacy to evaluate the change in dispersion by a single administration of pilsicainide.  (+info)

Mapping and ablation of ventricular tachycardia with the aid of a non-contact mapping system. (4/507)

OBJECTIVE: Treatment of ventricular tachycardia (VT) in coronary heart disease has to date been limited to palliative treatment with drugs or implantable defibrillators. The results of curative treatment with catheter ablation have proved disappointing because the complexity of the VT mechanism makes identification of the substrate using conventional mapping techniques difficult. The use of a mapping technology that may address some of these issues, and thus make possible a cure for VT with catheter ablation, is reported. PATIENTS AND INTERVENTION: The non-contact system, consisting of a multielectrode array catheter (MEA) and a computer mapping system, was used to map VT in 24 patients. Twenty two patients had structural heart disease, the remainder having "normal" left ventricles with either fasicular tachycardia or left ventricular ectopic tachycardia. RESULTS: Exit sites were demonstrated in 80 of 81 VT morphologies by the non-contact system, and complete VT circuits were traced in 17. In another 37 morphologies of VT 36 (30)% (mean (SD)) of the diastolic interval was identified. Thirty eight VT morphologies were ablated using 154 radiofrequency energy applications. Successful ablation was achieved by 77% of radiofrequency within diastolic activation identified by the non-contact system and was significantly more likely to ablate VT than radiofrequency at the VT exit, or remote from diastolic activation. Over a mean follow up of 1.5 years, 14 patients have had no recurrence of VT and only two target VTs have recurred. Five patients have had recurrence of either slower non-sustained, undocumented or fast non-target VT. Five patients have died, one from tamponade from a pre-existing temporary pacing wire, and four from causes unrelated to the procedure. CONCLUSION: The non-contact system can safely be used to map and ablate haemodynamically stable VT with low VT recurrence rates. It is yet to be established whether this system may be applied with equal success to patients with haemodynamically unstable VT.  (+info)

Low-frequency component of body surface potential maps identifies patients at risk for ventricular tachycardia. (5/507)

AIMS: To investigate the ability of spectral features of signal-averaged body-surface potential maps in identifying post-infarction patients who are at risk of developing ventricular tachycardia. METHODS AND RESULTS: We recorded 120 lead body surface potential maps during sinus rhythm in 135 subjects (45 patients with healed myocardial infarction but no history of ventricular tachycardia, 45 patients with both healed myocardial infarction and at least one episode of sustained ventricular tachycardia, and 45 normal subjects) and analysed spectral features of body surface potential maps selected on the basis of isoharmonic maps for given bands of the frequency spectrum. We found that in the low-frequency band (1-11 Hertz), the group-mean power spectra of leads located at isoharmonic map maxima were significantly different (P<0.0001) between the two groups of myocardial infarction patients. We estimated that this single feature alone can prospectively identify myocardial infarction patients at risk for ventricular tachycardia with a predictive accuracy of 74+/-6%. CONCLUSION: Our results suggest that the bulk of diagnostic information associated with arrhythmogenicity resides in the low-frequency band of the power spectrum. This finding is at variance with the established notion that only the high-frequency component of signal-averaged electrocardiograms carries such information.  (+info)

Signal averaged electrocardiography of Japanese. (6/507)

Although studies show that the ventricular tachycardia and sudden cardiac deaths caused by ischemic heart diseases affect Japanese less than Westerners, predictive accuracy of the signal averaged ECG for ventricular tachycardia and sudden cardiac deaths are almost the same as the results for Westerners. The recent prognosis of ischemic heart diseases is showing improvements along with the development of re-perfusion therapy, which is changing the significance of the signal averaged ECG. Therefore a clinical use for signal averaged ECG should be discussed in cases of cardiomyopathy which cause sudden cardiac deaths and other heart diseases. So it is necessary to redetermine normal values of the signal averaged ECG parameters. In this article, the following was reviewed on the basis of our studies regarding the clinical significance of the signal averaged ECG of Japanese and normal signal averaged ECG values. (1) System and gender specific differences on signal averaged ECG of Japanese, (2) His-Purkinje system, pre-P deflection and atrial late potential on signal averaged ECG, (3) Ventricular late potentials of Japanese.  (+info)

Use of electroanatomic mapping to delineate transseptal atrial conduction in humans. (7/507)

BACKGROUND: Interaction between wave fronts in the right and left atrium may be important for maintenance of atrial fibrillation, but little is known about electrophysiological properties and preferential routes of transseptal conduction. METHODS AND RESULTS: Eighteen patients (age 44+/-12 years) without structural heart disease underwent right atrial electroanatomic mapping during pacing from the distal coronary sinus (CS) or the posterior left atrium. During distal CS pacing, 9 patients demonstrated a single transseptal breakthrough near the CS os, 1 patient in the high right atrium near the presumed insertion of Bachmann's bundle and 1 patient near the fossa ovalis. The mean activation time from stimulus to CS os was 48+/-15 ms compared with 86+/-15 ms to Bachmann's bundle insertion (P<0.01) and 59+/-23 ms to the fossa ovalis (P=NS and P<0.01, respectively). During left atrial pacing, the earliest right atrial activation was near Bachmann's bundle in 5 and near the fossa ovalis in 4 patients. The activation time from stimulus to CS os was 70+/-15 ms compared with 47+/-16 ms to Bachmann's bundle (P<0.01) and 59+/-25 ms to the fossa ovalis (P=NS). Whereas the total septal activation time was not significantly different during CS pacing compared with left atrial pacing (41+/-16 versus 33+/-17 ms), the total right atrial activation time was longer during CS pacing (117+/-49 versus 79+/-15 ms; P<0.05). CONCLUSIONS: Three distinct sites of early right atrial activation may be demonstrated during left atrial pacing. These sites are in accord with anatomic muscle bundles and may have relevance for maintenance of atrial flutter or fibrillation.  (+info)

Computer-assisted animation of atrial tachyarrhythmias recorded with a 64-electrode basket catheter. (8/507)

OBJECTIVES: The aim of this study was to assess the value of a new mapping technique based on computer-assisted animation of multielectrode basket catheter (BC) recordings in patients with atrial arrhythmias. BACKGROUND: The three-dimensional activation patterns of cardiac arrhythmias are not completely understood owing to limitations of conventional mapping techniques. METHODS: The study included 32 patients with atrial tachycardia (AT) and 38 patients with atrial flutter (AFL). A software program was developed to analyze the activation patterns based on 56 bipolar electrograms recorded with a 64-electrode BC deployed in the right atrium (RA). RESULTS: The total time needed for the animation of activation patterns of atrial arrhythmias was 5 +/- 0.8 min. In 22 patients with right AT, the animated maps revealed that arrhythmia was unifocal in 15 patients, multifocal in 2 patients, polymorphic in 4 patients and reentrant in 1 patient. In 10 patients with left AT, breakthroughs on the right side of the septum (2 in 8 patients and 1 in 2 patients) and a left-to-right activation of the RA were demonstrated. In patients with typical AF, the reentrant excitation was a broad activation front with preferential propagation around the tricuspid annulus. In patients with atypical AFL, the reentry circuit involved one of the venae cavae and a line of block located in the posterior wall. CONCLUSIONS: The computer-assisted animation of multiple electrograms recorded with a BC is a valuable mapping tool that delineates the three-dimensional activation patterns of various atrial arrhythmias. The technique is appropriate for complex, short-lived or unstable arrhythmias.  (+info)

METHODS AND RESULTS The present study compares 120-lead body surface potential map (BSPM) data from 131 patients with acute MI and 159 normal control subjects (N). The MI population was stratified according to the location of ventricular wall motion abnormalities evidenced by radionuclide imaging into 76 patients with anterior MI (AMI), 32 patients with inferior MI (IMI), and 23 patients with posterior MI (PMI). BSPM were recorded within 24 hours of admission. Group mean BSPM of the ST segment were obtained for N, AMI, IMI, and PMI by sampling the time-normalized ST-T waveform at 18 equal intervals and averaging the voltages at each electrode site over the first five of these 18 ST-T time instants. Corresponding discriminant maps were also computed for each pairwise comparison (AMI versus N, IMI versus N, and PMI versus N) by subtracting the normal group mean voltages from each MI group mean voltages and by further dividing each resulting difference by the composite standard deviation calculated ...
Non-invasive diagnosis of acute myocardial infarction (AMI) associated with significant left main coronary artery stenosis (LMCAS) is challenging, with characteristic 12-lead ECG abnormalities of ST elevation (STE) in lead aVR, precordial T wave inversion (TWI) and/or ST depression (STD) having low diagnostic sensitivity. Methods Consecutive patients presenting to our unit with acute ischaemic-type chest pain from 2000-10 were analyzed. Entry criteria: 12-lead ECG and BSPM at presentation, cardiac troponin T (cTnT) ≤ 12h and coronary angiography during admission. Peak cTnT ≥0.03µg/L defined AMI. ECG abnormalities assessed: STEMI by Minnesota criteria; STE in lead aVR ≥0.5mm; STD ≥0.5mm in ≥2 contiguous leads (CL); TWI ≥1mm in ≥2CL. BSPM STE was: ≥2mm in anterior; ≥1mm in lateral, inferior, right ventricular (RV) or high right anterior (HRA); and ≥0.5mm in posterior territories. Angiographic luminal narrowing ≥70% defined significant LMCAS. Results Enrolled were 2810 ...
TY - GEN. T1 - An Algorithm for the Detection of ST Segment Elevation Relating to Induced Ischemia in Body Surface Potential Maps. AU - Finlay, Dewar. AU - Guldenring, Daniel. AU - Bond, Raymond. AU - Daly, Michael. PY - 2014/11/1. Y1 - 2014/11/1. N2 - Criteria have been developed and published for the detection of ST segment elevation myocardial infarction (STEMI) in the 12-lead electrocardiogram (ECG). In this study we report on an algorithm for the detection of ST segment elevation in body surface potential maps (BSPM). The algorithm seeks ST segment elevation, exceeding predefined thresholds, in two contiguous/adjacent leads. Thresholds are based upon the extension of existing 12-lead ECG criteria. The algorithm was applied to 45 subjects who had 120-lead BSPMs recorded during percutaneous transluminal coronary angioplasty (PTCA). The algorithm was capable of distinguishing between baseline ECGs and peak balloon inflation ECGs with a sensitivity of 84.4% and specificity of 86.7%. Standard ...
Adolescent; Adult; Arrhythmias, Cardiac; Body Surface Potential Mapping; Catheter Ablation; Child; Child, Preschool; District of Columbia; Female; Fluoroscopy; Humans; Infant; Infant, Newborn; Male; Prevalence; Radiation Dosage; Radiation Exposure; Radiation Protection; Retrospective Studies; Risk Factors; Surgery, Computer-Assisted; Treatment Outcome; Young Adult. ...
Ischemic heart disease is the single most frequent cause of death in. the world today. Electrocardiogram (ECG) exercise testing is a common. tool for diagnosing this disease. With the ECG exercise test one can. compare the recording of the electrical activity in the heart during. exercise and rest. A shift between the rest and exercise recording in. the segment of the heartbeat called the ST segment is used both for. diagnosing ischemia, and as input to cardiac computation methods.. Body surface potential mappings (BSPM) are ECG recordings at a greater. number of locations on the torso, and provides better detection and. localisation properties than the traditional 12-lead ECG. In BSPM and ECG,. noise and drift from various sources are recorded in addition to the. signal propagating from the heart. A model for this is:. BSPM=signal+noise+drift.. Before accurate measurements of the ST segments in a BSPM. can be made, the noise and drift in the recording must be reduced. while keeping the signal ...
Quantitatively mapping surface properties with nanometer or even subnanometer resolutions is critical for advanced scanning probe microscopy (SPM) characterization. However, the characterization performance often suffers from noises and artifacts due to instrumentation or environmental limitations. In this p
ECG imaging is an emerging technology for the reconstruction of cardiac electric activity from non-invasively measured body surface potential maps. In this case report, we present the first evaluation of transmurally imaged activation times against endocardially reconstructed isochrones for a case of sustained monomorphic ventricular tachycardia (VT). Computer models of the thorax and whole heart were produced from MR images. A recently published approach was applied to facilitate electrode localization in the catheter laboratory, which allows for the acquisition of body surface potential maps while performing non-contact mapping for the reconstruction of local activation times. ECG imaging was then realized using Tikhonov regularization with spatio-temporal smoothing as proposed by Huiskamp and Greensite and further with the spline-based approach by Erem et al. Activation times were computed from transmurally reconstructed transmembrane voltages. The results showed good qualitative agreement ...
Objectives. This study examined the performance of the 62-lead body surface electrocardiogram (ECG) in identifying the site of origin of ventricular tachycardia in patients with a previous myocardial infarction.. Background. Because the accuracy of ECG localization of ventricular tachycardia using standard 12-lead recordings is restricted to the identification of rather large ventricular areas, application of multiple torso lead recordings may augment the resolving power of the surface ECG and result in more discrete localization of arrhythmogenic foci.. Methods. Thirty-two patients were selected for electrophysiologically guided ablative therapy for drug-resistant postinfarction ventricular tachycardia. In these patients, QRS integral maps of distinct monomorphic ventricular tachycardia configurations were correlated with a previously generated infarct-specific reference data base of paced QRS integral maps. Each paced pattern in the data base corresponded with ectopic endocardial impulse ...
TY - JOUR. T1 - Molecular electrostatic potential mapping and structure-activity relationship for 3-methoxy flavones. AU - Santhosh, C.. AU - Mishra, P. C.. PY - 1996/12/1. Y1 - 1996/12/1. N2 - Molecular electrostatic potential (MEP) maps of certain 3-methoxy flavone derivatives having different anti-picornavirus activities have been studied. Geometries of the molecules were optimised and charge distributions computed using the AMI molecular orbital method. Hybridization displacement charges (HDC) were combined with the Löwdin charge distributions to compute the MEP maps. Reliability of the method of computing MEP maps was tested by studying certain other molecules for which ab initio MEP results are available. The anti-picornavirus activities of the flavones have been shown to be related with negative MEP values in two regions, one near the 3-methoxy group and another in a diagonally opposite region near the substituent attached to the C7 atom of the molecules.. AB - Molecular electrostatic ...
The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the understanding and treatment of arrhythmic heart diseases. However, the in vivo validation of source localization algorithms
BACKGROUND AND PURPOSE: Understanding drug effects on the heart is key to safety pharmacology assessment and anti-arrhythmic therapy development. Here our goal is to demonstrate the ability of computational models to simulate the effect of drug action on the electrical activity of the heart, at the level of the ion-channel, cell, heart and ECG body surface potential. EXPERIMENTAL APPROACH: We use the state-of-the-art mathematical models governing the electrical activity of the heart. A drug model is introduced using an ion channel conductance block for the hERG and fast sodium channels, depending on the IC(50) value and the drug dose. We simulate the ECG measurements at the body surface and compare biomarkers under different drug actions. KEY RESULTS: Introducing a 50% hERG-channel current block results in 8% prolongation of the APD(90) and 6% QT interval prolongation, hERG block does not affect the QRS interval. Introducing 50% fast sodium current block prolongs the QRS and the QT intervals by 12% and
TY - JOUR. T1 - Use of advanced mapping systems to guide ablation in complex cases. T2 - Experience with noncontact mapping and electroanatomic mapping systems. AU - Gurevitz, Osnat T.. AU - Glikson, Michael. AU - Asirvatham, Samuel. AU - Kester, Tammy A.. AU - Grice, Suellen K.. AU - Munger, Thomas M.. AU - Rea, Robert F.. AU - Shen, Win Kuang. AU - Jahangir, Arshad. AU - Packer, Douglas L.. AU - Hammill, Stephen C.. AU - Friedman, Paul A.. PY - 2005/4/1. Y1 - 2005/4/1. N2 - Objective: This report describes our experience with noncontact mapping and electroanatomic mapping in complex ablations, which are defined as ablations done after failure of conventional ablation. Material and Methods: Patients were included (N = 68; 49% with structural heart disease) in whom previous ablation failed and in whom a second procedure was done with advanced mapping. Non-contact mapping was used in 17 patients, electroanatomic mapping in 36, and both noncontact and electroanatomic mapping in 15. Arrhythmias ...
To evaluate the source of ST depression, a sheep model of subendocardial ischaemia using partial coronary artery ligation coupled with atrial pacing was developed. Ischaemia was induced initially in either the left anterior descending coronary artery or the left circumflex coronary artery territory and subsequently in the territory of the other vessel. The ischaemic regions were documented by a fluorescent microsphere technique. During ischaemia potentials were mapped simultaneously from the endocardium and the epicardium. The distributions of epicardial potentials from either ischaemic source were very similar (0.77±0.14, P,0.0001), both showing ST depression on the free wall of the left ventricle, and no association between the ST depression and the ischaemic region. At the same time, the endocardial ST elevation was directly associated with the region of reduced blood flow. Insulating the heart from the surrounding tissue with plastic increased the magnitude of epicardial and endocardial ST ...
Optical potential energy landscapes created using acousto-optical deflectors are characterized via solvent-driven colloidal particles. The full potential energy of both single optical traps and complex landscapes composed of multiple overlapping traps are determined using a simple force balance argument. The potential of a single trap is shown to be well described by a Gaussian trap with stiffness found to be consistent with those obtained by a thermal equilibrium method. We also obtain directly the depth of the well, which (as with stiffness) varies with laser power. Finally, various complex systems ranging from double-well potentials to random landscapes are generated from individually controlled optical traps. Predictions of these landscapes as a sum of single Gaussian wells are shown to be a good description of experimental results, offering the potential for fully controlled design of optical landscapes, constructed from single optical traps.. © 2012 Optical Society of America. Full ...
One of the problems with applying these data clinically might be the extra-invasive procedure (insertion of the non-contact balloon to the left ventricle) and the subsequent time and cost. Theoretically it would be very useful to perform non-contact mapping during the implant procedure in order to identify the area of latest activation not obstructed by conduction block and scar. This would also allow the operator to pass the catheter locator signal produced by the non-contact mapping system through the left ventricular lead and therefore steer it to that site. However, at the present time it is recommended that the patient is heavily anticoagulated while the non-contact balloon is in the left heart which would prevent safe implantation of the CRT system.. Fung and colleagues14 have gone some way to try and overcome this problem by comparing non-contact mapping data to tissue Doppler imaging. They found that latest activation on non-contact and tissue Doppler correlated well. They did not ...
A surface mapping electrode set assembly is provided which includes a plurality of insulated, elongated wires, each of which terminates at a distal end head portion of the assembly. The electrodes of
Rapid atrial arrhythmias such as atrial fibrillation (AF) predispose to ventricular arrhythmias, sudden cardiac death and stroke. Identifying the origin of atrial ectopic activity from the electrocardiogram (ECG) can help to diagnose the early onset of AF in a cost-effective manner. The complex and rapid atrial electrical activity during AF makes it difficult to obtain detailed information on atrial activation using the standard 12-lead ECG alone. Compared to conventional 12-lead ECG, more detailed ECG lead configurations may provide further information about spatio-temporal dynamics of the body surface potential (BSP) during atrial excitation. We apply a recently developed 3D human atrial model to simulate electrical activity during normal sinus rhythm and ectopic pacing. The atrial model is placed into a newly developed torso model which considers the presence of the lungs, liver and spinal cord. A boundary element method is used to compute the BSP resulting from atrial excitation. Elements of ...
based partly on calcrxc.hoc,v 1.3 2008/12/02 22:03:59 /* Calculates the effect of a uniform extracellular field on the extracellular potential adjacent to the membrane of a model neuron. Assume a uniform field with orientation specified by polar coordinates: phi is the angle between the field vector and the z axis. theta is the angle between the x axis and the projection of the field vector onto the x axis. The isopotential surfaces are perpendicular to the orientation of the field, and uniformly spaced. Without loss of generality, we may assume that the potential is 0 for all points on the isopotential surface that passes through (0,0,0). Let this be called the zero potential plane. The potential at any point xyz is proportional to the distance of that point from the zero potential plane. The distance is given by the dot product of the vector from (0,0,0) to (x,y,z) p = x*ux + y*uy + z*uz with the fields unit vector (i.e. the unit vector that is orthogonal to the zero potential plane): ufield ...
Pyloric motor neurons synapse at multiple sites along pyloric muscle fibers (Atwood et al., 1977, 1978; Atwood and Wojtowicz, 1986).A priori, two explanations for the EJP amplitude variability reported here thus exist. One is that the muscle fibers are essentially isopotential (fiber length less than two length constants) and the variability arises from variability in vesicle number released at each synaptic site during each spike. Given the large number of synaptic sites and large variation in quantal number observed at some crustacean synapses (Atwood and Wojtowicz, 1986), this variation would give rise to the smooth variation in EJP amplitude we observe. However, the short λ measured with multiple penetrations contradicts this explanation, because these data imply that the muscle fiber is not isopotential, and hence different synaptic sites are electrically isolated from each other. Pyloric muscle diameter is such that relatively small changes in membrane resistance would induce large length ...
We present a new image integration technique for flash and long-exposure image pairs to capture a dark scene without incurring blurring or noisy artifacts. Most existing methods require well-aligned images for the integration, which is often a burdensome restriction for practical use. We address this issue by locally transferring the colors of the flash images using a small fraction of corresponding pixels in the long-exposure images. We formulate image integration as a convex optimization problem with the local linear model. The proposed method makes it possible to integrate the color of the long-exposure image with the detail of the flash image without causing any harmful effects to its contrast, where the images do not need perfect alignment by virtue of our new integration principle. We show our method successfully outperforms the state-of-the-art in image integration and reference based color transfer for challenging misaligned datasets. ...
An implantable lead body, and method of manufacturing same, and system for stimulation. The lead body includes an expanding/expansion section providing an additional length or slack in the lead body and allowing the lead body to expand or stretch with the body thereby reducing or eliminating the mechanical force or strain on the ends of the lead at the destination sites.
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Air temperature: -2.2°C. In the late evening, the ship left iceberg C-18A and traveled east in search of an area away from the influence of icebergs. The principal investigators monitored the ships data systems during the transit to select the study area. When the ship reached a suitable location about 75 kilometers away, a suite of sampling began to characterize the area. First, the MOCNESS net system was deployed for several hours and recovered before sunrise. While the MOCNESS crew sorted samples in the lab, other research teams conducted water collections with trace-metal-clean Niskin bottles, surface mapping, and CTD casts throughout the day. Just after dinner, a Langrangian sediment trap was lowered into the water and started on a three-day drift at 600 meters depth. After completing the last set of surface mapping measurements late tonight, the ship will transit south back toward a zone rich with small icebergs for the next study area.. Bottles and bottles of seawater samples were ...
Anatomically accurate and biophysically detailed bidomain models of the human heart have proven a powerful tool for gaining quantitative insight into the links between electrical sources in the myocardium and the concomitant current flow in the surrounding medium as they represent their relationship mechanistically based on first principles. Such models are increasingly considered as a clinical research tool with the perspective of being used, ultimately, as a complementary diagnostic modality. An important prerequisite in many clinical modeling applications is the ability of models to faithfully replicate potential maps and electrograms recorded from a given patient. However, while the personalization of electrophysiology models based on the gold standard bidomain formulation is in principle feasible, the associated computational expenses are significant, rendering their use incompatible with clinical time frames. In this study we report on the development of a novel computationally efficient ...
Brain electric field data (EEG and event-related potentials [ERP]) recorded simultaneously from many electrodes (locations) on the human head surface can be viewed as series of maps of the momentary spatial distributions of electric potential, as potential landscapes (Lehmann, 1971, 1972). Typically, 128 to 512 maps per second are used. The historical and unfortunate discussions in the EEG community about the choice of a presumable inactive electric reference location are not an issue here, because a given landscape cannot be changed by the location of the point from which it is measured; this choice merely determines the value labels of the isopotential lines - quite like the rising or receding water level of a lake in a mountainous area changes the location of the zero water level mark, but not the landscape (Lehmann, 1987; Geselowitz, 1998). Over time, the potential landscapes vary in electric strength. Map Hilliness (Lehmann, 1971) assesses map strength; it is defined as the sum of the ...
A lead assembly adapted for endocardial fixation to a human heart is provided. The lead assembly includes a lead body that has a proximal end provided with a connector for electrical connection to a cardiac stimulator. The cardiac stimulator may be a pacemaker, a cardioverter/defibrillator, or a sensing instrument. The distal end of the lead body is connected to a tubular electrode housing. The lead body consists of a noncoiled conductor cable surrounded by a coextensive insulating sleeve. In contrast to conventional leads, the lead body of the present invention does not require coiled conductor wires or an internal lumen. Manipulation of the lead body is via an external guide tube. Lead body diameters of 0.25 mm or smaller are possible.
Surface mapping plays an important role in geometric processing, which induces both area and angular distortions. If the angular distortion is bounded, the mapping is called a quasiconformal mapping (
Gene therapy to repair damaged heart muscle is most likely to succeed if it can be injected at the site of ischemia where there is viable myocardium with reduced contractile ability, and a new technique that combines imaging and electroanatomical mapping does just that. A study of this novel approach that shows increased blood flow in treated areas in patients with refractory angina is published in Human Gene Therapy.
A lead includes a lead body extending from a proximal end to a distal end and having an intermediate portion. A shocking electrode is disposed proximate the distal end of the lead body, and a pacing electrode is disposed along the intermediate portion of the lead body. The distal end of the lead body includes a preformed biased shape.
Start at 2018-01-19 12:35:36 First, load the ontology MsigdbC2KEGG and its gene associations in the genome Hs (2018-01-19 12:35:36) ... org.Hs.eg (from https://github.com/hfang-bristol/RDataCentre/blob/master/dnet/1.0.7/org.Hs.eg.RData?raw=true) has been loaded into the working environment (at 2018-01-19 12:35:37) org.Hs.egMsigdbC2KEGG (from https://github.com/hfang-bristol/RDataCentre/blob/master/dnet/1.0.7/org.Hs.egMsigdbC2KEGG.RData?raw=true) has been loaded into the working environment (at 2018-01-19 12:35:39) Then, do mapping based on symbol (2018-01-19 12:35:39) ... Among 19420 symbols of input data, there are 19038 mappable via official gene symbols but 382 left unmappable Third, perform GSEA analysis based on 1000 permutations for 186 gene sets (2018-01-19 12:35:43) ... Sample 1 is being processed at (2018-01-19 12:35:43) ... 10 of 186 gene sets have been processed (2018-01-19 12:35:45) ... 20 of 186 gene sets have been processed (2018-01-19 12:35:48) ... 30 of 186 gene sets have ...
Service Mapping can perform discovery based on data collected using the Netflow protocol. Netflow is a protocol that Service Mapping can use to collect data about CIs and their connections along with Netstat and lsof commands. Using the Netflow protocol
不動産担保ローンは無担保のローンに比べ金利が安い - 所有している不動産を担保にして借り入れをする不動産担保ローンは 無担保のローンに比べると 不動産の価値にもよりますが 金利が安く 融資額が大きい 長期の借り入れが可能などのメリットがあります》 融資額の内容は所有している […] ...
Pseudoaneurysm of thoracic aorta as a complication of blunt trauma to the chest, can present with a variety of symptoms due to mass compression effect. Here we report the first pseudoaneurysm of thoracic aorta presenting with chronic cough and inappropriate sinus tachycardia. The purpose of this case report is to highlight pseudoaneurysm of thoracic aorta as a rare differential diagnosis for inappropriate sinus tachycardia. Here we report a case of 29-year-old white woman, a nurse, with history of a motor vehicle accident. She initially presented to medical attention with inappropriate sinus tachycardia 2 years following the motor vehicle accident during her pregnancy. Six years later she underwent sinoatrial node modification after failing a number of medications. Days prior to the ablation she developed a mild cough which became constant within a week following ablation. A computed tomography scan of her chest performed as part of a workup revealed an outpouching of the inferomedial aspect of the
Optical tweezers (OT) are widely used for pico (and femto)-Newton range force measurements. The appropriate choice of the bead size is not well understood for biopolymer stretching applications of OT. We have shown, both by theory and experiment, that wrong choice of the bead size could cause errors as large as 295% in the measured force. We provide a simple map for correct choice of the bead size and the direction of pulling for such applications. There is a good agreement between our theoretical and experimental results.. © 2013 Optical Society of America. Full Article , PDF Article ...
Inappropriate sinus tachycardia (IST) is a nonparoxysmal arrhythmia characterized by either a continuous sinus tachycardia or intermittent periods of inappropriately rapid sinus rates.
Inappropriate sinus tachycardia (IST) is a non-paroxysmal arrhythmia, characterized by a persistently high sinus heart rate (HR) and/or an exaggerated HR response to minimal exertion, and can be responsible for palpitations, asthenia, chest pain, dizziness and syncope, which can be highly invalidating. Conventional treatment of IST, targeted to symptoms control, mainly consists on β-blockers. However, these drugs are often insufficient or not well tolerated because of side effects (mostly hypotension) that usually limit the administered dose. Ivabradine, a sinus rate lowering agent currently employed in Europe in the treatment of stable angina and chronic heart failure, has recently been demonstrated to be effective and safe in the treatment of IST by a few case reports and clinical trials. A randomized clinical trial comparing ivabradine to β-blockers has not be performed yet ...
Can inappropriate sinus tachycardia be brought on by having severe gastroparesis and chronic fatigue? I was just diagnose with IST and doc thinks it was brought on by my severe illness and he said that...
0154] FIG. 20 is an illustration of an exemplary application of functional imaging and non-invasive electrical potential mapping according to a method of the present invention. As will be appreciated, the system and methodology of the present invention allow for both functional imaging of biological objects 19 and mapping of electrical excitation within biological tissues 19. This may be achieved as a two-step imaging process, as illustrated in FIG. 20. First, the system 100 is used as an electromagnetic tomographic imaging tool for non-invasive assessment of functional and pathological conditions of a biological object 19 and the location of any areas of diseased tissues 19. For example, in FIG. 20, cardiac tissue with suspicious areas of myocardium is functionally imaged in Step 1 to identify areas of ischemia/infarction. Second, if the location of a diseased target is within a biologically excited tissue 19 (such as cardiac tissue, nervous tissue, musculoskeletal tissue, or the like), then a ...
The techniques of theoretical chemistry have been used to elucidate the molecular properties and modes of receptor binding that modulate receptor affinity and antagonist activity of the beta-carbolines, a class of potent benzodiazepine antagonists. Six analogs were chosen in order to investigate the role of the amine (NH) group, the aromatic nitrogen, and the C3-substituent in determining receptor affinities. Electrostatic potential mapping and characterization of explicit drug-receptor interactions have led to the hypothesis that simultaneous interaction of a model cationic arginine site with the N2 and C3-substituents could play a key role in determining receptor affinities. The electron-withdrawing effects of C3-substituents on the amine nitrogen appear less important, though interactions of these groups with an anionic glutamate or aspartate site could also occur at the receptor. Similarly, stacking interactions with neutral or cationic aromatic residues such as tryptophan or protonated ...
Affiliation (based on the past Project Information):大阪大学,基礎工学研究科,教授, Research Field:Measurement engineering,Laboratory medicine, Keywords:current density map,核四極共鳴,システム開発,isopotential map,myocardial infarction,核四極,NQR,イメージング,三次元イメージ,圧電効果, # of Research Projects:6, # of Research Products:47
Since I was 18, I have noticed times when my heart seems to stall out for a second or so, then catch up by beating really rapidly for a few beats before evening itself out. Since these occure...
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Hi everyone. I am new to this group and was really hoping that someone might have some insight for me. Im a 23 year old female and have been diagnosed with IST...
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The mechanism of post-infarct SMVT is scar-related re-entry in the majority of patients (1). Inhomogeneous scarring with varying degrees of subendocardial myocardial fiber preservation within dense zones of fibrosis leads to slowed conduction, nonuniform anisotropy, and the potential for channels within the scar zone-conditions necessary for the development of re-entry (2,3). In the ablation era, high-density electroanatomic mapping has been used to characterize the electrical correlates of this well-described pathologic substrate, allowing for development of substrate modification strategies (7) to target unmappable SMVTs (19). Channels within a scar (isolated potentials [6,11], very late potentials) or regions at the scar-border zone (putative exit sites) (18,20) appear to represent critical components of the re-entrant circuit and have all been targeted with successful long-term ablation outcomes.. The current study compares these key markers of SMVT substrate by creating high-density maps of ...
Mekkaoui, Choukri, Marcel P Jackowski, Aravinda Thiagalingam, William J Kostis, Sonia Nielles-Vallespin, David Firmin, Himanshu Bhat, Jeremy N Ruskin, Timothy G Reese, and David E Sosnovik. 2014. Correlation of DTI tractography with electroanatomic mapping in normal and infarcted myocardium. Journal of Cardiovascular Magnetic Resonance 16 (Suppl 1): O68. doi:10.1186/1532-429X-16-S1-O68. http://dx.doi.org/10.1186/1532-429X-16-S1-O68. ...
A medical lead which has a connector assembly coupled to an electrode by a lead body, the lead body is designed so as to have greater resistance to crush fatigue in the area which is located between the rib and clavicle when implanted. In particular the lead body of the present invention features an insulative sheath covering a coiled conductor. The coiled conductor has three sections, viz., proximal, intermediate and distal sections. The intermediate section has a different pitch as compared to proximal section and distal section. In the preferred embodiment, intermediate section has a pitch of approximately 0.100 while proximal section has a pitch of approximately 0.025 and distal section has a pitch of approximately 0.025. Moreover, intermediate section has a length of approximately 10.4 inches while proximal section has a length of approximately 5.1 inches and distal section has a length of approximately 7.2 inches. In such a manner the lead of the present invention presents a coiled conductor
In the voltageclamp configuration, a current is injected into the cell via a negative feedback loop to compensate changes in membrane potential. This technique is the refinement of the voltage clamp. Neuroscience is available from oxford university press. Sep 29, 20 this screencast describes iv and vi relations derived from patch or current clamp data, and how to calculate conductance or resistance from the data. Still more recently, a technique has been invented, patch clamping, that makes it possible to voltage clamp small regions of the nerve cell membrane, and look at the responses of individual ion channels to changes in voltage across the membrane. Oct 28, 20 the voltage clamp is a technique used to control the voltage across the membrane of a small or isopotential area of a nerve cell by an electronic feedback circuit. Alternatively, the current clamp technique can be used. Identification and regulation of wholecell chloride currents. Theory the basis of the voltage clamp may be ...
An assembly is provided for an implantable medical lead. The assembly includes a first lead body comprising one or more electrical leads, and a hermetic encasement. The encasement comprises a housing having first and second openings and interior walls, an interior space defined by the interior walls, an electronic network housed within the interior space, and a circuit board extending through the first and second openings. The circuit board comprises a plurality of layers into which the electronic network is at least partially integrated, a first set of one or more terminals electrically coupling the electronic network to the first lead body, and a second set of one or more terminals electrically coupled to the electronic network for external electrical engagement.
Hi everyone. I havent posted in a very long time, but I experienced HELLP with my pregnancy back in November of 2010. Since then there have been several tests for autoimmune disorders and other things, all which have come back normal. However, I have had fairly frequent heart palpitations since the birth of my son. I actually got them prior to my pregnancy, but they would be very rare...now they occur more frequently. After wearing a heart monitor, it looks like I am basically experiencing inappropriate sinus tachycardia. This isnt a very serious thing from what I gather, but I am on a low dose beta-blocker to help with the symptoms ...
Assessment of myocardial fibrosis by endoventricular electromechanical mapping in experimental nonischemic cardiomyopathy.. International Journal of Cardiovascular Imaging International Journal of Cardiac Imaging. 27:25-37. 2011 ...
A lead includes a lead body extending from a proximal end to a distal end and having an intermediate portion. A shocking electrode is disposed proximate the distal end of the lead body, and a pacing electrode is disposed along the intermediate portion of the lead body. The distal end of the lead body includes a pre-formed biased shape.
To demonstrate this potential, clusters of contracting cardiomyocytes isolated from the differentiation cultures were transplanted into the left ventricle of pigs that had their atrioventricular node ablated. The recipient hearts had spontaneous rhythms that appeared to originate from the transplanted cells as assessed by high-resolution electroanatomical mapping. Though promising, these results also raise the concern that transplanted cells could serve as a nidus for arrhythmia. Other mesoderm-derived lineages. While the hematopoietic, vascular, and cardiac lineages have been studied in most detail, the ES cell system does offer the potential to develop many other mesoderm lineages. To date, cell populations representing the skeletal muscle (Rohwedel et al. 1994 ...
The Seal of Danthazars about to open for-real cross-my-heart this time, so stand back. The seal - basically a manhole with modified Sigil of Baphomet and some vaguely Celtic knots - isnt literally over the Hellmouth. The Hellmouth is a colorful term for the focal point of mystical energies. In other circumstances, that might read as fantasy gobbledy-gook to smear over any number of sins in plotting mechanics. Lately, down at the convergence point in the basement, the floor plan has become unmappable, shifting, nonlinear. Tricky. And the Hellmouth is nowhere, but does seem to end up manifesting as a hole in the dirt which belches forth unclean things. And the Hellmouth is everywhere, but seems to draw all dramatic focus to the sepulchral caverns under a school. This spot seems to want to be a school or need to be a school. If you burn it down, the Hellmouth pushes a new one up through the rubble. If you switch campuses to UC Sunnydale, youll find the Hellmouths manmade twin malfunctioning ...
The Seal of Danthazars about to open for-real cross-my-heart this time, so stand back. The seal - basically a manhole with modified Sigil of Baphomet and some vaguely Celtic knots - isnt literally over the Hellmouth. The Hellmouth is a colorful term for the focal point of mystical energies. In other circumstances, that might read as fantasy gobbledy-gook to smear over any number of sins in plotting mechanics. Lately, down at the convergence point in the basement, the floor plan has become unmappable, shifting, nonlinear. Tricky. And the Hellmouth is nowhere, but does seem to end up manifesting as a hole in the dirt which belches forth unclean things. And the Hellmouth is everywhere, but seems to draw all dramatic focus to the sepulchral caverns under a school. This spot seems to want to be a school or need to be a school. If you burn it down, the Hellmouth pushes a new one up through the rubble. If you switch campuses to UC Sunnydale, youll find the Hellmouths manmade twin malfunctioning ...
A lead includes a lead body extending from a distal end to a proximal end, and at least one conductor disposed within the lead body and extending from the distal end to the proximal end of the lead body. The lead further includes an outer terminal ring, a terminal pin, and an insulative sleeve disposed between the outer terminal ring and the terminal pin, where the insulative sleeve is coupled with the outer terminal ring with a snap-fit connection. A pin latch is disposed on an outer periphery surface of the insulative sleeve, where the pin latch is rotatable about a hinge point.
Master´s Thesis Švarc, V., 2015: Shielding effect of oxide isolating layer on surface potential measured by Kelvin probe force microscopy. MASTER´S…
Having received the European CE Mark for its Rhythmia Mapping System just last May, Boston Scientific just won FDA clearance for the cardiac mapping and
Strange encounters: Willis Carto was an ally of Alliance founder William Pierce in the 1960s, but the two anti-Semites feuded for the next three decades. Carto was nevertheless invited to a number of Alliance events in recent years, including one where he edified skinhead Ryan Maziarka, the swastika-tattooed treasurer of the groups current board of directors. The end result was the humiliation of Pierce successor Erich Gliebe ...
Cardiac mapping is a technique in which the information from cardiac electrograms is gathered and displayed. Cardiac mapping is used to diagnose the heart
Technological singularity around the corner? » Forum Post by Timmaigh » Is this actually for real? I mean do they really h
Kavuru, Madhav S.; Vesselle, Hubert; Thomas, Cecil W. (1987). Advances in Body Surface Potential Mapping (BSPM) Instrumentation ... and LL to give an average potential of the body: V. W. =. 1. 3. (. R. A. +. L. A. +. L. L. ). {\displaystyle V_{W}={\frac {1}{3 ... Electrodes are the actual conductive pads attached to the body surface. Any pair of electrodes can measure the electrical ... Look at electrical activity from the vantage point of the inferior surface (diaphragmatic surface of heart) ...
This is a type of specialized brain and body scan used to map neural activity in the brain or spinal cord of humans or other ... These, however, pick up signals better from the brain surface, and less well from deeper structures such as the hippocampus.[ ... The local field potential, which includes both post-neuron-synaptic activity and internal neuron processing, better predicts ... Raichle, M. E. (2000), Toga, A. W.; Mazziotta, J. C. (eds.), Brain mapping: the systems, London: Academic Press, ISBN 978-0-12- ...
... body surface potential mapping MeSH E01.370.405.245 - electroencephalography MeSH E01.370.405.245.100 - alpha rhythm MeSH ... body surface potential mapping MeSH E01.370.370.380.240.230 - electrocardiography, ambulatory MeSH E01.370.370.380.240.850 - ... body surface potential mapping MeSH E01.370.370.380.245 - electrophysiologic techniques, cardiac MeSH E01.370.370.380.250 - ... body surface potential mapping MeSH E01.370.405.240.230 - electrocardiography, ambulatory MeSH E01.370.405.240.850 - ...
... surface water-bodies, wetlands, coastal land use, ground-water targets, urban land use etc. have provided the basis for ... Assessing deforestation Mapping urban areas for planning purposes Delineating ocean areas with higher fish catch potential and ... The agency has executed several projects under National mapping missions wherein mapping and inventory of forests, wastelands, ... Mapping of forests and grasslands. Monitoring of forest encroachment and shifting cultivation Forest fire surveillance. Mapping ...
Sample types have included: surface and underground grab samples, surface and underground drill core samples, drill sludge ... In 1893, Map #27 by the Geological Survey Department was produced by E.R. Faribault to illustrate a report commissioned by the ... This comparison indicates that a potential for a larger deposits exists on Orex's property. Two different approaches to ... 1.19 to 2.42 g/t Main Ore Body: 19,500,000 tonnes @ 0.75 to 3.37 g/t West Goldbrook Area: 8,614,817 tonnes @ 0.53 to 0.84 g/t ...
Areas PV and S2 both map the body surface. Functional neuroimaging in humans has revealed that in areas PV and S2 the face is ... using evoked potentials and electrical stimulation. Experiments involving ablation of the second somatosensory cortex in ... Individual neurons in areas PV and S2 receive input from wide areas of the body surface (they have large "receptive fields"), ... Areas S2 in the left and right hemispheres are densely interconnected, and stimulation on one side of the body will activate ...
Interferometric Synthetic Aperture Radar (InSAR) can generate maps of surface deformation or elevation, using satellite radar ... In addition to a wide variety of commercial projects, they have a significant involvement with national and European bodies ... Offshore, NPA's Global Offshore Seep Project uses SAR data to detect oil seepage from potential reservoirs. ... NPA Satellite Mapping is the longest-established satellite mapping specialist in Europe, with expertise in geoscience ...
... , also known as open-cast or open cut mining, is a surface mining technique of extracting rock or minerals from ... This is done through drilling of probe holes in the ground, then plotting each hole location on a map. The information gained ... Open-pit gold mining is one of the highest potential mining threats on the environment as it affects the air and water ... through the holes with provide an idea of the vertical extent of the ore's body. This vertical information is then used to pit ...
... or a downhole tool lowered into a borehole which transects a body of mineralisation. These methods can map out sulphide bodies ... Surface EM methods are based mostly on Transient EM methods using surface loops with a surface receiver, ... They are used to map the subsurface distribution of stratigraphy and its structure which can be used to delineate potential ... Surface loop surveys are rarely used for regional exploration, however in some cases such surveys can be used with success (e.g ...
The mapping of the body surfaces in the brain is called somatotopy. In the cortex, it is also referred to as the cortical ... They react in quick action potentials, especially to vibrations around 250 Hz (even up to centimeters away). They are the most ... This brain-surface ("cortical") map is not immutable, however. Dramatic shifts can occur in response to stroke or injury. The ... Proske U, Gandevia SC (October 2012). "The proprioceptive senses: their roles in signaling body shape, body position and ...
This is a type of specialized brain and body scan used to map neural activity in the brain or spinal cord of humans or other ... It can also record signal from all regions of the brain, unlike EEG/MEG, which are biased toward the cortical surface. But fMRI ... The local field potential, which includes both post-neuron-synaptic activity and internal neuron processing, better predicts ... As this proportion fell, a map of blood flow in the brain was seen in the MRI. They verified this by placing test tubes with ...
Each probe is carried to the surface in a lifting body lander. The probes also have the intelligence on par with a 4-year-old ... Its primary purpose was to look for potential landing sites for the Horus probes and to map the entire planet. After deployment ... The Horus probes are used for the surface operations of the Darwin IV expedition. The Von Braun carries three probes. Each ... The first probe, Balboa, explodes along with its lifting body transport during entry, because one of its wings failed to unfold ...
Pressure in a static body of water increases proportionally to the depth below the surface of the water. The surfaces of ... This means that gravitational potential energy on a contour map is proportional to altitude. On a contour map, the two- ... The gravity potential is the gravitational potential energy per unit mass. In electrostatics the electric potential is the ... It has a potential energy U = m g h {\displaystyle U=mgh} where U is the gravitational potential energy and h is the height ...
... also known as brain electrical activity mapping or BEAM ) The heart is the muscle that pumps oxygenated blood to the whole body ... EMG measures action potentials, called Motor Unit Action Potentials (MUAPs), created during muscle contraction. A few common ... Using surface EMG and a torque motor, Levin et al. (1994, 2000) demonstrated a direct relationship between the velocity of ... However, visual evoked potentials do play a role in the whole diagnostic process. Parkinson's disease is a degenerative ailment ...
Groundwater flow directions can be determined from potentiometric surface maps of water levels in wells and springs. Aquifer ... may draw in non-potable water or saltwater intrusion from hydraulically connected aquifers or surface water bodies. This can be ... Environmental regulations require sites with potential sources of contamination to demonstrate that the hydrology has been ... Aquifers occur from near-surface to deeper than 9,000 metres (30,000 ft). Those closer to the surface are not only more likely ...
Iron occurrences were observed during initial geological mapping of the area in the mid thirties but the economical potential ... Sixteen ore bodies extending for up to 3 km and 100m thick. Amenable to open pitting. Coal resource nearby suitable for blast ... The oxidised ores, extending up to 130m below ground surface, consist mainly of magnetite, martite and hydrogoethite. Two other ... The regional geology was mapped at 1:50 000 while the Hajigak deposit was mapped at 1:10 000. Focusing on the western area of ...
A sensory space can also map into a particular region on an animal's body. For example, it could be a hair in the cochlea or a ... Receptive fields can positively or negatively alter the membrane potential with or without affecting the rate of action ... through the bidimensional skin surface, being a receptive field for touch perception. ... and the body (Extrastriate body area). However, more recent research has suggested that the fusiform face area is specialised ...
The mini-magnetosphere is 360 km across at the surface and is surrounded by a 300-km-thick region of enhanced plasma flux that ... The small size of the lunar core, however, is a potential obstacle to promoting that hypothesis to the status of theory. ... Alternatively, it is possible that on an airless body such as the Moon, transient magnetic fields could be generated during ... For example, the Chandrayaan-1 spacecraft mapped a "mini-magnetosphere" at the Crisium antipode on the Moon's far side, using ...
Basin or depression that formerly contained a standing surface water body Salt pan (geology) - Flat expanse of ground covered ... As shown in Table 2 below, fewer than half (44%) of known ciénagas are functional or restorable, while 56% have no potential ... A working ciénaga inventory is maintained at the University of Texas Austin with access to numerous papers, google maps and ... Ciénegas also purify surface water and mitigate flooding when heavy precipitation occurs, and help to cycle nutrients between ...
MAP) kinase pathway and the extracellular signal-related kinase (ERK) pathway. Activation of both of the MAP and ERK pathways ... The potential benefits or harms related to any combination of non-invasive diagnostic tests for endometriosis are not clear ( ... Endometriosis is a full body condition in which cells similar to those in the endometrium, the layer of tissue that normally ... Early endometriosis typically occurs on the surfaces of organs in the pelvic and intra-abdominal areas. Health care providers ...
The residual Bouguer potential is contributed by the mantle. The undulation of the crust-mantle boundary, or the Moho surface, ... A separate free-air gravity anomaly map, Bouguer gravity anomaly map and a map of crustal thickness were produced along with ... Simply, if Mars is assumed to be a static perfectly spherical body of radius RM, provided that there is only one satellite ... The measured gravitational potential of Mars from orbiters could be generalized as the equation below, V ( M a r s ) = V ( S o ...
"In this model, culture spreads like the surface of a body of water, spreading towards available spaces or trickling downwards ... "map and not a tracing". They elaborate in the same section, "What distinguishes the map from the tracing is that it is entirely ... as the water is charged with pressure and potential to always seek its equilibrium, and thereby establish smooth space." ... The surface can be interrupted and moved, but these disturbances leave no trace, ...
The satellites use radar signals that are able to map a body of water based on the amount of disturbance on the surface from ... CSN uses images from a number of satellites in order to alert member states of potential oil spills. CSN offers near-real-time ... This allows the satellites to map and locate an accumulation of oil. Not only are these satellites able to map oil slicks, but ... When the oil is present on the water's surface, it creates a glassy area free of ripples. SAR satellites send radar signals ...
The probe has made a 3-D map of the Moon's surface and has provided some of the first images of Apollo equipment left on the ... To this end, a detailed mapping program identifies safe landing sites, locates potential resources on the Moon, characterizes ... Stardust intercepted comet Tempel 1 on February 15, 2011, a small Solar System body previously visited by Deep Impact on July 4 ... It was intended to help select landing sites for the Apollo program by mapping the Moon's surface. The program produced the ...
Sparks often indicate the presence of a high voltage, or "potential field". The higher the voltage; the farther a spark can ... This plasma is heated to temperatures often greater than the surface of the sun, and can cause small, localized burns. ... Conductive liquids, gels or ointments are often used when applying electrodes to a person's body, preventing sparks from ... Kryzhanovsky, L. N. (1989). "Mapping the history of electricity". Scientometrics. 17: 165-170. doi:10.1007/BF02017730. Heilbron ...
These points of contact can then be turned into a three-dimensional ellipsis, producing a surface map of the object. In hand ... The relationship between these two is described through a contact model, which is a set of the potential points of contact ... A robot hand interacts with static and deformable objects, described with soft-body dynamics. Sometimes, additional tools has ... can be used to produce a surface map or contact model of the object being grasped. For a robot to autonomously grasp an object ...
... of bodies of water in the Canadian High Arctic to Holocene climate change and to potential paleolake regions on the surface of ... The work is supported by the Ocean Exploration Trust, as part of an initiative of Robert Ballard to explore and map the deep ... CS1 maint: discouraged parameter (link) Shea, Rachel Hartigan (18 October 2013). "Discoverer of the Titanic Is Mapping ... extreme landscapes like volcanoes and Arctic deserts serve as physical or operational substitutes for various planetary bodies ...
The chronaxie values for mammalian ventricles at body temperature range from 0.5 ms (human) to 2.0 to 4.1 ms (dog); this is an ... An electrode is inserted into the muscle of interest, which is then stimulated using surface current. Chronaxie values increase ... Data reported in the literature use either motor response as the physiological threshold in humans or action potential ... Data derived from micro-electrode stimulation and physiological mapping of sensory thalamus are scarce. The two stimulation ...
... "build a series of projects that map the surfaces of rocky worlds and explore the atmospheres of planets and small bodies the ... leveraging its advantages against student time constraints and potential bandwidth limitations. Gay's work on Exploring the ... mapping and characterization of surface features using visual data provided by NASA missions. Crater counting is described as " ... "a valuable exercise, but it's hard to automate." Surface features, such as the size and degradation of craters, are identified ...
Cave diving is a form of penetration diving, meaning that in an emergency a diver cannot ascend directly to the surface due to ... resulting in potential deep diving risks. Graham Balcombe (8 March 1907 - 19 March 2000), a founder of the Cave Diving Group ... maps and articles on shipwrecks, editor, a founder of Sea Research Society in 1972 Robert Sténuit (born 1933), underwater ... Australian cave diver who died attempting to recover the body of another diver from Bushman's Hole in South Africa Jack ...
... patient waste and surfaces that may have come into contact with body fluids need to be disinfected.[111] During the 2014 ... The potential for widespread infections in countries with medical systems capable of observing correct medical isolation ... Reports emerged that maps of the area were inaccurate, not so much hampering medical providers as epidemiologists and officials ... Ebola can stay in some body parts like the eyes,[143] breasts, and testicles after infection.[4][144] Sexual transmission after ...
... the complex motor skills of octopuses are not organised in their brain via an internal somatotopic map of its body, instead ... The interior surfaces of the arms are covered with circular, adhesive suckers. The suckers allow the octopus to anchor itself ... This form of locomotion allows these octopuses to move quickly away from a potential predator without being recognised.[76] A ... Some species differ in form from the typical octopus body shape. Members of the suborder Cirrina have stout gelatinous bodies ...
In the original maps, aircraft were expected to take off and land in a path parallel with the runway. The new plans saw flight ... The only remaining potential airline for operating a hub was Air Berlin, which was in financial difficulties and did not plan ... Reports have surfaced about cable conduits that hold too many cables or hold cables in incompatible combinations, such as phone ... Both provide enough space for maintenance work on four to five narrow-body aircraft.[306][307] ...
The spread of B. burgdorferi is aided by the attachment of the host protease plasmin to the surface of the spirochete.[87] ... "Lyme Disease risk areas map". Risk of Lyme disease to Canadians. Government of Canada. 27 January 2015. Archived from the ... In 10-20% of untreated cases, EM rashes develop at sites across the body that bear no relation to the original tick bite.[23] ... White matter disease may have a greater potential for recovery than gray matter disease, perhaps because the neuronal loss is ...
Inversion in a circle with center O and radius R consists of the following operation (Figure 5): every point P is mapped into a ... Apollonius' problem can be extended from the plane to the sphere and other quadratic surfaces. For the sphere, the problem is ... each line corresponds to the radical axis of a potential pair of solution circles. To show this, Gergonne considered lines ... one can consider the problem of four tangent curves that result from the intersections of an arbitrary quadratic surface and ...
Endangered Species and the Stuff We Buy, All Mapped Out. The New York Times, 6 January 2017 ... Bottom: Potential vegetation in climate now if not for human effects like agriculture.[95] ... Over the past 125,000 years, the average body size of wildlife has fallen by 14% as human actions eradicated megafauna on all ... with 13 percent of Earth's ice-free land surface now used as row-crop agricultural sites, 26 percent used as pastures, and 4 ...
Eakin, P.A. Porter-Armstrong, A.P. & Stinson, M.D. (2003) Pressure mapping systems: reliability of pressure map interpretation. ... An indoor-outdoor chair is less limited, but may have restricted range or ability to deal with slopes or uneven surfaces. An ... Everest and Jennings saw the business potential of the invention and went on to become the first mass-market manufacturers of ... While fully reclining spreads the person's weight over the entire back side of the body, tilting wheelchairs transfer it from ...
Mind-body problem[edit]. Main article: Mind-body problem. See also: Philosophy of mind, Dualism (philosophy of mind), Monism, ... "Human Brain Mapping. 30 (11): 3475-94. doi:10.1002/hbm.20771. PMC 2767459 . PMID 19387980.. ... In particular, the supplementary motor complex on the medial surface of the frontal lobe appears to activate prior to primary ... Libet found that the unconscious brain activity of the readiness potential leading up to subjects' movements began ...
... usually just hovering above the surface, touches a platter, or scratches the magnetic data-storage surface. A head crash ... A 1990s drive that does not start due to stiction can sometimes be started by tapping it or rotating the body of the drive ... Earlier drives had a tendency toward developing bad sectors with use and wear; these bad sectors could be "mapped out" so they ... with potential loss of all data. Recovery of some or even all data from a damaged drive is sometimes, but not always possible, ...
NASA is investigating the use of swarm technology for planetary mapping. A 1992 paper by M. Anthony Lewis and George A. Bekey ... Mobile media and new technologies have the potential to change the threshold for collective action due to swarm intelligence ( ... is a global optimization algorithm for dealing with problems in which a best solution can be represented as a point or surface ... discusses the possibility of using swarm intelligence to control nanobots within the body for the purpose of killing cancer ...
cell surface. • membrane-bounded organelle. • endoplasmic reticulum. • membrane raft. • Golgi apparatus. • growth cone. • ... neuronal cell body. • perinuclear region of cytoplasm. • early endosome. • synaptic vesicle. • macromolecular complex. • ... positive regulation of MAP kinase activity. • positive regulation of catalytic activity. • mitochondrial transport. • post- ... regulation of resting membrane potential. • regulation of synaptic transmission, glutamatergic. • amyloid precursor protein ...
Recent advances in mapping of the human genome have identified other genetic causes of low vision or blindness. One such ... Lack of facial expressions, mimics, or body gestures/responses. *Non-verbal gestures that could imply the visually impaired ... braille is a form of communication in which people use their fingers to feel elevated bumps on a surface and can understand ... accompanied by concerted efforts to ensure the accessibility of information technology to all potential users, including the ...
Corfe Castle in 978 saw the murder of King Edward the Martyr, whose body was taken first to Wareham and then to Shaftesbury. ... A map by the American historian called "The Dominions of Canute" (pictured just above) shows that Cornwall, like Wales and ... which also offered the potential for the extraction of silver.[42][43] Forts were set up at Bath and Ilchester. The lead and ... below the surface.[48] The coins were excavated by archaeologists from the Portable Antiquities Scheme.[49] ...
The phantoms provide the opportunity to precisely measure radiation exposure not only at the surface of the body but also at ... LunaH-Map - Homepage at the Arizona State University. *^ Harbaugh, Jennifer, ed. (2 February 2016). "LunaH-Map: University- ... A variety of potential targets would be identified based upon launch date, time of flight, and rendezvous velocity. ... Lunar Polar Hydrogen Mapper (LunaH-Map), a lunar orbiter designed at the Arizona State University,[35] will map hydrogen within ...
Nor'easters often come with the potential of dumping a foot or more of snow on Brattleboro when they move through; such storms ... During this period a small body of British colonial troops were posted at the fort, but after 1750 this was considered ... Brattleboro's electricity is supplied by Green Mountain Power.[109] Brattleboro's surface water supply is the Pleasant Valley ... USDA Plant Hardiness Zone Map Archived February 27, 2014, at the Wayback Machine, US Department of Agriculture. Retrieved ...
See also: Potential effects of tea on health. One study showed pu'er tea suppresses fat production in rats.[39] Pu'er tea is ... Shape and size : The more surface area, the faster the tea will age. Bǐngchá and zhuancha thus age more quickly than golden ... Its shape is similar to tuóchá, but larger in size, with a much thicker body decorated with pumpkin-like ribbing. This shape ... "Tea Map - Jingmai, Yunnan". Retrieved 2018-03-23.. [better source needed ...
"Yellowknife Heritage Map" (PDF). City of Yellowknife. Retrieved October 10, 2015.. *^ a b c d e f Healey, M.C.; Woodall, W.L. ( ... At the south end is the larger Kam Fault, which when it was active had the same potential for earthquakes as the San Andreas ... It is an 84-hectare (210-acre) endorheic[2] freshwater body located between the city's downtown section and a larger ... In colder months when the lake surface was not frozen over, the city dumped plowed snow into the lake, adding even more ...
Map of Puntland State of Somalia *^ "Election and administrative structure". plstate. Archived from the original on 18 July ... Nomads primarily rely on wells as a source of water rather than surface water. There are four main seasons around which ... The transportation body also started an upgrade and repair project in June 2012 on the large thoroughfare between the regional ... is part of a broader campaign by the Puntland administration to focus on tapping into the region's commercial potential through ...
The brain is made up of individual cells (neurons) that contain specialized features such as dendrites, a cell body, and an ... Event-related potential positive and negative 10µ to 100µ Volts (µ is millionths) responses, measured via noninvasive ... Electrocorticography intracranial EEG, the practice of using electrodes placed directly on the exposed surface of the brain to ... Map, atlas, and database projectsEdit. *Brain Activity Map Project 2013 NIH $3 billion project to map every neuron in the human ...
... street names forming a straight line on the map, but omitting intermediate streets Map Random - streets on map presented in ... The rat must swim around the pool until by chance it discovers just below the surface the hidden platform onto which it can ... Yet, this field has traditionally been hampered by confounding variables, such as cost and the potential for previous exposure ... It stores information regarding non-egocentric space (egocentric means in reference to one's body position in space) and ...
... resistant surfaces. A dust resistant surface is a state of prevention against dust contamination or damage, by a design or ... The tails of comets are produced by emissions of dust and ionized gas from the body of the comet. Dust also covers solid ... As a multi-factor phenomenon, there is not yet a clear consensus on the sources or potential solutions to the problem. ... Map of dust in 2017. Dust are fine particles of matter.[1] It generally consists of particles in the atmosphere that come from ...
Apis cerana japonica forming a ball around two hornets: The body heat trapped by the ball will overheat and kill the hornets. ... A. mellifera, the most common domesticated[15] species, was the third insect to have its genome mapped. It seems to have ... Bee venom is under laboratory and clinical research for its potential properties and uses in reducing risks for adverse events ... "Albert Einstein is sometimes quoted as saying, "If the bee disappears from the surface of the earth, man would have no more ...
"When you feel your own equal in the body of a beautiful woman, just as ready to forget the world for you as you for her - oh my ... Haldane was also the first to construct human gene maps for haemophilia and colour blindness on the X chromosome and he was one ... Emil du Bois-Reymond (1818-1896): German physician and physiologist, the discoverer of nerve action potential, and the father ... These questions seem different on the surface, but all of them share one quality that makes them impossible to answer: all of ...
Harlow (1848).[5]:393 Macmillan (2000)[1]:106-8,375-6 discusses potential reluctance on the part of Harlow, and of Gage's ... The top of the head appeared somewhat like an inverted funnel, as if some wedge-shaped body had passed from below upward. Mr. ... evidence has surfaced[citation needed] supporting Harlow's statement that Gage made public appearances in "the larger New ... "Mapping Connectivity Damage in the Case of Phineas Gage". PLoS ONE. 7 (5): e37454. doi:10.1371/journal.pone.0037454. PMC ...
... a wide variety of potential sources for cosmic rays began to surface, including supernovae, active galactic nuclei, quasars, ... The most recent is the Fermi Observatory, which has produced a map showing a narrow band of gamma ray intensity produced in ... Cosmic rays impacting other planetary bodies in the Solar System are detected indirectly by observing high-energy gamma ray ... A. de Angelis (2010). "Penetrating Radiation at the Surface of and in Water". Il Nuovo Cimento. 3: 93-100. arXiv:1002.1810. ...
Adams J (April 2003). "Potential for proteasome inhibition in the treatment of cancer". Drug Discovery Today. 8 (7): 307-15. ... These sites are located on the interior surface of the rings, so that the target protein must enter the central pore before it ... Decreased proteasome activity has been suggested as a cause of aggregation and Lewy body formation in Parkinson's.[96] This ... The Proteolysis Map. *Exosome. *Endoplasmic reticulum-associated protein degradation. *JUNQ and IPOD ...
Surface texturing is one of techniques used to reduce optical losses to maximize light absorbed. Currently, surface texturing ... By adding cells to the outside of the body, the mission time could be extended with no major changes to the spacecraft or its ... By concentrating sunlight up to a thousand times, High concentrated photovoltaics (HCPV) has the potential to outcompete ... PV Status Report 2013 , Renewable Energy Mapping and Monitoring in Europe and Africa (REMEA). Iet.jrc.ec.europa.eu (11 April ...
the characteristic length of the bluff body, V. {\displaystyle V}. is the velocity of the flow over the bluff body, and S. {\ ... Radar devices can only measure surface velocities, whereas laser-based devices can measure velocities sub-surface.[17] ... The potential difference is sensed by electrodes aligned perpendicular to the flow and the applied magnetic field. The physical ... Turbine meter bodies are commonly made of bronze, cast Iron, or ductile iron. Internal turbine elements can be plastic or non- ...
Her body was found, wrapped in plastic, in Wind River. She died from "repeated blows to the back of the head by a blunt obtuse- ... Andy recognized that the cave drawing was a map, and he therefore played a big part in FBI agent Dale Cooper's finding his way ... Through most of the first season, Josie seems innocent, an easy mark and potential victim for her more savvy and cunning sister ... and surface later in Agent Cooper's dream sequence. MIKE's full name, Phillip Michael Gerard, is also a reference to Lieutenant ...
Weight of a 1 kg mass at the Earth's surface is m × g; mass times the acceleration due to gravity which at the Earth's surface ... It relates the acceleration of a body to the applied force via Newton's law, F = m × a: force equals mass times acceleration. ... The formal road map to redefinition includes a special CODATA adjustment of the fundamental constants with a closing date for ... voltage (electrical potential), emf W/A kg⋅m2⋅s−3⋅A−1. ... at the Earth's surface. Weight is the force exerted on a body ...
This study describes a practical approach for the extraction of diagnostic information from body surface potential maps. Body ... It is concluded that this approach achieves efficient information extraction from body surface potential maps for improved ... of best electrocardiographic leads for diagnosing myocardial infarction by statistical analysis of body surface potential maps. ... surface potential map data from 361 subjects were used to identify optimal subsets of leads and features to distinguish 184 ...
Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ... Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ... Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ... Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ...
Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ... Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ... Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ... Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ...
... new parameters describing depolarization and repolarization inhomogeneity in high resolution body surface potential maps (HR ... To assess the risk of VT, the following parameters were proposed: correlation coefficient between STT and QRST integral maps ( ... STT_QRST_CORR), departure index of absolute value of STT integral map (STT_DI), and departure index of absolute value of T-wave ... and non-dipolar content of QRST integral maps.Results:STT_DI, TSI_DI, STT_QRST_CORR, QRS width, and QT interval parameters were ...
Body surface potential mapping (BSPM) records ECG with multiple leads covering the entire thorax, with a variety of ECG ... Assessment of myocardial infarction injury by strain rate imaging and body surface potential mapping. Show full item record ... Vi registrerade EKG hos infarktpatienter över hela bröstkorgen medelst 120 elektroder (body surface potential mapping, BSPM) ... Assessment of myocardial infarction injury by strain rate imaging and body surface potential mapping. ...
Non-Invasive Personalisation of a Cardiac Electrophysiology Model from Body Surface Potential Mapping. August 24, 2017 ... We use non-invasive data (body surface potential mapping, BSPM) to personalize the main parameters of a cardiac ... First, an efficient forward model is proposed, coupling the Mitchell-Schaeffer transmembrane potential model with a current ...
keywords = "body surface potential mapping, ECG, body surface potential mapping, ECG, body surface potential mapping, ECG", ... Arrhythmia localization using body surface potential mapping during catheterization. K. Simelius, T. Jokiniemi, J. Nenonen, I. ... Arrhythmia localization using body surface potential mapping during catheterization. / Simelius, K.; Jokiniemi, T.; Nenonen, J ... title = "Arrhythmia localization using body surface potential mapping during catheterization",. ...
... ... The bivariate correlations of the various indirect measures of exercise myocardial ischemia and myocardium at potential for ...
... ... Exercise Body Surface Potential Mapping in Single and Multiple Coronary Artery Disease: Results (Part 2) ... Exercise Body Surface Potential Mapping in Single and Multiple Coronary Artery Disease: Methods (Part 1) ... Exercise Body Surface Potential Mapping in Single and Multiple Coronary Artery Disease: Methods (Part 3) ...
Discriminant function analysis of body surface potential maps in acute myocardial infarction. In: Journal of Electrocardiology ... Discriminant function analysis of body surface potential maps in acute myocardial infarction. Journal of Electrocardiology. ... 1994). Discriminant function analysis of body surface potential maps in acute myocardial infarction. Journal of ... Discriminant function analysis of body surface potential maps in acute myocardial infarction. / McMechan, S; Cullen, C; ...
Kavuru, Madhav S.; Vesselle, Hubert; Thomas, Cecil W. (1987). Advances in Body Surface Potential Mapping (BSPM) Instrumentation ... and LL to give an average potential of the body: V. W. =. 1. 3. (. R. A. +. L. A. +. L. L. ). {\displaystyle V_{W}={\frac {1}{3 ... Electrodes are the actual conductive pads attached to the body surface. Any pair of electrodes can measure the electrical ... Look at electrical activity from the vantage point of the inferior surface (diaphragmatic surface of heart) ...
Adult , Aged , Area Under Curve , Body Surface Potential Mapping/instrumentation , Bundle-Branch Block/diagnosis , ... Using 49 capacitive-coupled electrodes, mattress-type harness was developed to obtain posterior body surface potential map (P- ... Posterior Body Surface Potential Mapping Using Capacitive-Coupled Electrodes and Its Appli ... Posterior Body Surface Potential Mapping Using Capacitive-Coupled Electrodes and Its Application ...
T1 - Pre-hospital body surface potential mapping improves early diagnosis of acute coronary artery occlusion in patients with ... Pre-hospital body surface potential mapping improves early diagnosis of acute coronary artery occlusion in patients with ... Pre-hospital Body Surface Potential Mapping improves early diagnosis of acute coronary artery occlusion in patients with ... title = "Pre-hospital body surface potential mapping improves early diagnosis of acute coronary artery occlusion in patients ...
Body Surface Potential Mapping / methods* * Catheter Ablation / methods* * Female * Humans * Imaging, Three-Dimensional / ... The impact of CT image integration into an electroanatomic mapping system on clinical outcomes of catheter ablation of atrial ... Ablation was guided by 3D mapping alone (electroanatomic 24, noncontact 23) in 47 (3DM group) patients and by CT image ... mapping system on the clinical outcome of patients undergoing CA for AF. ...
... were assessed by 87-lead body surface potential mapping (BSPM). The BSPM, noninvasive technique with semi-automatic readings, ... therapy on the ventricular repolarization of heart failure patients as assessed by body surface potential mapping.. Pastore CA1 ...
Assessment of body surface potential mapping in diabetic patients with recognized depression.. Janocha A, Bolanowski M, ... OBJECTIVES: Parameters of body surface potential mapping (BSPM) in DM II patients are significantly different comparing with ... Assessment of body surface potential mapping in diabetic patients with recognized depression. Neuro Endocrinol Lett. 2017 Jan; ... Body Surface Potential Mapping:methods, Depression:complications, Diabetes Mellitus:diagnosis, Electrocardiography:methods, ...
Introduction: Epicardial potentials (EP) derived from the body surface potential map (BSPM) improve acute myocardial infarction ... Epicardial Potentials computed from the Body Surface Potential Map using inverse electrocardiography and an individualised ... Epicardial Potentials computed from the Body Surface Potential Map using inverse electrocardiography and an individualised ... A cardiologist blinded to both the 12-lead ECG and BSPM interpreted the EP map. AMI was defined as cTnT ≥0.1µg/L.Results: ...
An Algorithm for the Detection of ST Segment Elevation Relating to Induced Ischemia in Body Surface Potential Maps. / Finlay, ... An Algorithm for the Detection of ST Segment Elevation Relating to Induced Ischemia in Body Surface Potential Maps. Unknown ... title = "An Algorithm for the Detection of ST Segment Elevation Relating to Induced Ischemia in Body Surface Potential Maps", ... T1 - An Algorithm for the Detection of ST Segment Elevation Relating to Induced Ischemia in Body Surface Potential Maps ...
Clinical use of body surface potential mapping in cardiac arrhythmias. Dictionary browser ? ...
Advances in Body Surface Potential Mapping (BSPM) Instrumentation. Pediatric and Fundamental Electrocardiography. ... When one places," a spot of the substance on the absorbent surface of the TLC plate, the solvent (or solvents) run up through ...
ECG/body surface potential mapping/holter. 42. Echo/Doppler (coronary). 43. Echo/Doppler (myocardium). ...
Body surface potential mapping (BSPM) (Figure 6 [Fig. 6]) uses 64 or more electrodes (as many as 120) to record and measure ... Body surface potential mapping. Multichannel ECG provides comprehensive 3-dimensional data of the electrical currents from the ... Krenzke G, Kindt C, Hetzer R. Corrected body surface potential mapping. Biomed Tech (Berl). 2007;52(1):37-42. DOI: 10.1515/BMT. ... Medvegy M, Duray G, Pint r A, Pr da I. Body surface potential mapping: historical background, present possibilities, diagnostic ...
Endocardial mapping of localized sources driving atrial fibrillation (AF) in humans has not been reported. METHODS AND RESULTS ... Body Surface Potential Mapping*. Catheter Ablation*. Catheterization. Electrocardiography. Electrophysiology. Female. Humans. ... BACKGROUND: Endocardial mapping of localized sources driving atrial fibrillation (AF) in humans has not been reported. METHODS ... During AF with a cycle length of 211+/-32 ms, activation mapping identified 1 to 3 sources at the origin of atrial wavefronts ...
Body Surface Potential Mapping*. Cardiography, Impedance. Electric Conductivity. Electrocardiography. Fetal Diseases / ... The heart generates magnetic fields that can be detected by body surface mapping utilizing super conducting quantum ... noninvasive His potential recording, detection of arrhythmic mechanism defining reentrant circuits vs non reentrant mechanism, ... are increased sensitivity to small signals and lack of conductivity in body tissues, presentation of direct component signals ...
... this is sometimes known as body surface potential mapping.. Internal electrocardiograms may also be recorded by implanted ... The vast majority of electrocardiograms are recorded by placing electrodes on various sites on the body surface, typically the ...
... the electrophysiological basis of late potentials, mechanism of arrhythmias, the different methods of recording and anal ... Body surface mapping of late potentials Yukio Ozawa. Pages 151-171 * Twenty-four hour analysis for late potential activity: ... Spectrotemporal mapping of the surface ECG for detection of ventricular late potentials ... Modulating effect of ischemia on late potentials Michael Ya. Ruda, Irina N. Merkulova, Irina D. Strazhesko, Irina V. Savelieva ...
... was regionally related to areas of most pronounced R-amplitude attenuation as assessed by body surface potential mapping. ... Family relatives were studied by ECG, Holter ECG, echocardiography, ECG body surface potential mapping, and cardiac magnetic ... Corrected body surface potential mapping.. *Gerhard Krenzke, Carsten M Kindt, Roland Hetzer ...
Vulnerability to ventricular arrhythmia : assessment by mapping of body surface potential GARDNER MJ. ... Use of body surface electrodariographic mapping to localize the asynergic site in previous myocardial infarction. IKEDA K. ... 心筋梗塞の重症度評価における体表面電位図の臨床的有用性.QRS departure maps および ST maps と左室造影所見との対比検討. 中野博 ... Body surface distributions
Acute Coronary Syndrome; Emergency Service, Hospital; Body Surface Potential Mapping; Myocardial Infarction; Chest Pain ... Weight Loss; Obesity; Resistance Training; Body Composition; Osteoarthritis, Knee Academic: 336-713-8116. Department: 336-713- ...
Body Surface Potential Mapping for Detection of Myocardial Infarct Sites. P Zarychta, FE Smith, ST King, AJ Haigh, A Klinge, D ... VVRED Group member Milan Horáček (Dalhousie University) provided body surface potential mapping (BSPM) capability for MALT ... and he is now conducting a study aimed at delineating healed infarcts based on body surface potential maps in 40 of these ... The BSPM data, consisting of ECG data for 352 torso-surface sites, are provided in easy-to-read ASCII format for a single ...
  • Thus, BSPM has the potential to reduce morbidity and improve survival in this high-risk patient group by facilitating emergent revascularization. (ahajournals.org)
  • METHODS AND RESULTS The present study compares 120-lead body surface potential map (BSPM) data from 131 patients with acute MI and 159 normal control subjects (N). The MI population was stratified according to the location of ventricular wall motion abnormalities evidenced by radionuclide imaging into 76 patients with anterior MI (AMI), 32 patients with inferior MI (IMI), and 23 patients with posterior MI (PMI). (ahajournals.org)
  • This study proposes new parameters describing depolarization and repolarization inhomogeneity in high resolution body surface potential maps (HR BSPM) to identify MI patients threatened by VT. (medscimonit.com)
  • Body surface potential mapping (BSPM) records ECG with multiple leads covering the entire thorax, with a variety of ECG variables automatically calculated from its recordings. (helsinki.fi)
  • We use non-invasive data (body surface potential mapping, BSPM) to personalize the main parameters of a cardiac electrophysiological model for predicting the response to different pacing conditions. (embs.org)
  • These formats do not, however, provide support for less prominent methods such as the Body Surface Potential Map (BSPM). (ulster.ac.uk)
  • Using 49 capacitive-coupled electrodes , mattress-type harness was developed to obtain posterior body surface potential map (P-BSPM) in dressed individuals. (bvsalud.org)
  • The axes of P-BSPM vector potential corresponded well with 12- lead electrocardiogram . (bvsalud.org)
  • During QRS, the end point of P-BSPM vector potential demonstrated characteristic clockwise rotation in RBBB, and counterclockwise rotation in LBBB patients . (bvsalud.org)
  • abstract = "Aims: To determine whether 80-lead body surface potential mapping (BSPM) improves detection of acute coronary artery occlusion in patients presenting with out-of-hospital cardiac arrest (OHCA) due to ventricular fibrillation (VF) and who survived to reach hospital. (qub.ac.uk)
  • In this study, a series of 60 patients (61.7% male, mean age 59.2+/-11.54 years) in NYHA functional class III-IV heart failure and LBBB, who received CRT through implantation of atrial-biventricular pacemakers, were assessed by 87-lead body surface potential mapping (BSPM). (nih.gov)
  • Parameters of body surface potential mapping (BSPM) in DM II patients are significantly different comparing with healthy non-diabetic subjects. (nel.edu)
  • BSPM recordings were displayed in a form of the Int-QRST maps. (nel.edu)
  • Introduction: Epicardial potentials (EP) derived from the body surface potential map (BSPM) improve acute myocardial infarction (AMI) diagnosis. (ulster.ac.uk)
  • In this study, we compared EP derived from the 80-lead BSPM using a standard thoracic volume conductor model (TVCM) with those derived using a patient-specific torso model (PSTM) based on body mass index (BMI).Methods: Consecutive patients presenting to both the ED and pre-hospital coronary care unit between August 2009 and August 2011 with acute ischaemic-type chest pain at rest were enrolled. (ulster.ac.uk)
  • 0.3mV defined STE. A cardiologist blinded to both the 12-lead ECG and BSPM interpreted the EP map. (ulster.ac.uk)
  • VVRED Group member Milan Horáček (Dalhousie University) provided body surface potential mapping (BSPM) capability for MALT patients returning for their one-year follow-up MRI, and he is now conducting a study aimed at delineating healed infarcts based on body surface potential maps in 40 of these patients. (physionet.org)
  • The comparison with the body surface potential mappings (BSPM) measured during pacing and the ECGI method indicates a good predictive power. (archives-ouvertes.fr)
  • In some studies, also body surface potential mapping (BSPM) data were used for comparison purposes. (aalto.fi)
  • In the validation of the activation time maps calculated from MCG and BSPM recordings, invasively measured epicardial electrograms were used to construct the reference epicardial activation times. (aalto.fi)
  • The goal of non-invasive electrocardiographic imaging (ECG imaging) [ 35 , 41 ], also called the inverse problem of electrocardiography, is to reconstruct high-resolution maps of cardiac electrical activity from the signals recorded at the body surface (either 12-lead ECGs or multi-lead Body Surface Potential Maps). (springer.com)
  • The inverse problem of electrocardiography consists in reconstructing cardiac electrical activity from given body surface electrocardiographic measurements. (frontiersin.org)
  • To overcome this drawback, one can consider reconstructing electrical potentials on both epicardial and endocardial heart surfaces. (frontiersin.org)
  • Li, Danshi 1997 , 'Epicardial and endocardial ST potential mapping in ischaemia', PhD thesis, University of Tasmania. (edu.au)
  • Insulating the heart from the surrounding tissue with plastic increased the magnitude of epicardial and endocardial ST and QRS potentials and decreased the potentials from limb leads, implying that the ST depression arises from current paths within the myocardium rather than external. (edu.au)
  • The epicardial and endocardial ST potentials were measured and correlated with regional myocardial blood flow measured by fluorescent microspheres. (edu.au)
  • These stimuli create a temporary physical distortion in the membranes of specialized receptors, causing ion channels to open and ultimately generating action potentials, which are the messages of the nervous system . (newworldencyclopedia.org)
  • The bivariate correlations of the various indirect measures of exercise myocardial ischemia and myocardium at potential for ischemic risk are summarized in Table 4. (symptoms-and-diseases.com)
  • This study describes a noninvasive method for detecting delayed ventricular activation, caused by ischemia, on the body surface. (physiology.org)
  • Current density estimation on the left ventricular epicardium: A potential method for ischemia localization. (aalto.fi)
  • Perform echocardiography and/or MRI, primarily to exclude arrhythmogenic right ventricular cardiomyopathy, as well as to assess for other potential causes of arrhythmias. (medscape.com)
  • BACKGROUND: Endocardial mapping of localized sources driving atrial fibrillation (AF) in humans has not been reported. (biomedsearch.com)
  • Despite tremendous progress in the field over the last decades, the solution of this problem in terms of electrical potentials on both epi- and the endocardial heart surfaces with acceptable accuracy remains challenging. (frontiersin.org)
  • Secondly, a conventional transfer matrix for electrical potentials can be split into two parts, one of which turned out to posess regularizing properties leading to improved endocardial reconstructions. (frontiersin.org)
  • Due to a more complex non-convex geometry of the epi-endocardial heart surface compared to its relatively simple "convex hull" (epicardium/pericardium), the inverse problem for endo-epicardial reconstruction becomes even worse conditioned. (frontiersin.org)
  • In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. (wikipedia.org)
  • The vast majority of electrocardiograms are recorded by placing electrodes on various sites on the body surface, typically the limbs and the chest . (everything2.com)
  • Explain the following relationships: Δ G and w , cell potential and w, cell potential and Δ G, cell potential and Q. Using these relationships, explain how you could make a cell in which both electrodes are the same metal and both solutions contain the same compound, but at different concentrations. (bartleby.com)
  • Systems and related methods guide a movable electrode within an array of multiple-electrodes located within the body. (google.es)
  • BSP mapping is a non-invasive ECG method enabling more precise diagnostic of cardiac diseases based on detailed registration of surface cardiac potentials using high number of sensing electrodes [1]. (prolekare.cz)
  • The ischemic region was mapped with bipolar electrodes and, after the chest was rapidly closed, signal-averaged recordings were made from the body surface. (physiology.org)
  • This review will highlight the basic principles and recent advantages of MCGs, and the application of MCG in clinical diagnosis, especially in cases whose ECGs are non-diagnostic or not specific, such as detecting baseline shift in ischemic heart disease, noninvasive His potential recording, detection of arrhythmic mechanism defining reentrant circuits vs non reentrant mechanism, diagnosis of fetal arrhythmias and prolongation of QT interval. (biomedsearch.com)
  • The filter has the property that it does not create an artifact or ring after the QRS complex ends, thereby allowing the detection of microvolt-level potentials that occur immediately after the QRS complex. (physiology.org)
  • methods for detecting acute coronary syndrome without ST elevation are Body Surface Potential Mapping, functional imaging and CGM. (egms.de)
  • During AF with a cycle length of 211+/-32 ms, activation mapping identified 1 to 3 sources at the origin of atrial wavefronts in 38 patients (76%) predominantly in the left atrium, including the coronary sinus region. (biomedsearch.com)
  • The clinical availability of MPI would indicate a new level of mapping coronary pathways and detecting arterial blockages. (epo.org)
  • Concerned about the potential risks associated with both failure to recognise such an important and potentially life-threatening diagnosis and with those associated with over-diagnosis, over-investigation and over-treatment, you wonder whether the presence of ST elevation in aVR is a specific marker of that diagnosis. (bestbets.org)
  • Finally we analyze the components of an EST and potential sensitivities, significances and predictability of the changes in the outcome data that will provide diagnosis overt cardiovascular disease, and for purposes of exercise prescription and evaluation of rehabilitation effects in cardiac patients. (oatext.com)
  • This equipment is used to provide images of the soft tissues of the body, derived from radio signals emitted mostly by transiently excited hydrogen nuclei, for clinical diagnosis. (encyclopedia.com)
  • Ablation was guided by 3D mapping alone (electroanatomic 24, noncontact 23) in 47 (3DM group) patients and by CT image integration (Cartomerge) in 47 (CT group). (nih.gov)
  • CONCLUSIONS: AF associated with consistent atrial activation sequences after prior ablation emanates mostly from localized sources that can be mapped and ablated. (biomedsearch.com)
  • A mapping and ablation catheter is described. (freepatentsonline.com)
  • Advances in electroanatomic mapping have revolutionized interventional strategies, especially those pertinent to atrial fibrillation (AF) ablation and device therapy for heart failure. (eplabdigest.com)
  • This article describes and compares these three modalities, highlighting their advantages and limitations with respect to mapping and ablation. (eplabdigest.com)
  • The long-term success of ablation in patients with persistent AF can be further enhanced by incorporating adjunctive ablation strategies to PV isolation, such as targeting sites demonstrating complex atrial fractionated electrograms (CFAEs) during AF or at regions that may show 'AF nests' during real-time spectral mapping in sinus rhythm. (eplabdigest.com)
  • Getting to zero: impact of electroanatomical mapping on fluoroscopy use in pediatric catheter ablation. (gwu.edu)
  • Barr, R.C., Ramsey, M., Spach, M.S.: Relating epicardial to body surface potential distributions by means of transfer coefficients based on geometry measurements. (springer.com)
  • Data about structures, spatial distributions, compositions, and ages are used to define and map geological units. (dlr.de)
  • Repercussions of cardiac resynchronization therapy on the ventricular repolarization of heart failure patients as assessed by body surface potentia. (nih.gov)
  • Repercussions of cardiac resynchronization therapy on the ventricular repolarization of heart failure patients as assessed by body surface potential mapping. (nih.gov)
  • Body Surface Mapping of Ventricular Repolarization Heterogeneity: An Ex-vivo Multiparameter Study. (helsinki.fi)
  • During ischaemia potentials were mapped simultaneously from the endocardium and the epicardium. (edu.au)
  • Body surface potential maps of ventricular depolarization in normal adults. (semanticscholar.org)
  • The proposed approach provided more accurate solution on the ventricular endocardium compared to the conventional potential-based solutions with Tikhonov regularization of the 0th, 1st, and 2nd orders. (frontiersin.org)
  • This usually involves contact mapping with the use of a mapping catheter that is dragged over the endocardium. (eplabdigest.com)
  • The aim of this nonrandomized study was to determine the impact of computerized tomography (CT) image integration into a 3-dimensional (3D) mapping system on the clinical outcome of patients undergoing CA for AF. (nih.gov)
  • With this respect, significant progress has been recently made in the development of numerical algorithms for solving the inverse problem of ECG in terms of epicardial potentials, which is reflected in a constantly increasing number of clinical applications of the ECGI. (frontiersin.org)
  • Odom JV, Bach M, Brigell M et al (2016) ISCEV standard for clinical visual evoked potentials. (springermedizin.de)
  • Widely developed for clinical screening, electrocardiogram (ECG) recordings capture the cardiac electrical activity from the body surface. (readbyqxmd.com)
  • 75% of the time using a 20-pole catheter with 5 radiating spines covering 3.5-cm diameter or sequential conventional mapping. (biomedsearch.com)
  • Role of Catheter Mapping in the Preoperative Evaluation of Ventricular Tachycardia, The American Journal of Cardiology, vol. 40, pp. 207-220, Jan. 1982. (patents.com)
  • 6. The system of claim 1 , wherein the movable electrode is located on a movable catheter body. (google.es)
  • Carto® XP System Overview Initially described by Ben-Haim et al in 1996,1 the Carto® system involves point-by-point mapping using a deflectable quadripolar catheter. (eplabdigest.com)
  • One of the most significant innovations that have transformed the field of cardiac electrophysiology has been the evolution of three-dimensional (3-D) mapping systems. (eplabdigest.com)
  • Local depolarization abnormalities are the dominant pathophysiologic mechanism for type 1 electrocardiogram in brugada syndrome a study of electrocardiograms, vectorcardiograms, and body surface potential maps during ajmaline provocation. (medscape.com)
  • The ultimate goal of the ECGI is to allow non-invasive panoramic cardiac mapping in a beat-to-beat mode, thus facilitating diagnostics and treatment planning for non-sustained, aperiodic or non-tolerable cardiac arrhythmia. (frontiersin.org)
  • Electrocardiographic Imaging (ECGI) is a method for noninvasive epicardial EP mapping. (pubmedcentralcanada.ca)
  • According to the EDL theory, under certain assumptions, the potential generated by the three-dimensional electric source distribution within the myocardium is equal to the potential generated by a dipole layer on the myocardial surface. (springer.com)
  • For this purpose, analysis of the relationship between the Int-QRST (isointegral) maps distribution and the depressive symptoms intensification, as well interrelation between depressive and diabetic symptoms were performed. (nel.edu)
  • Isointegral QRST maps turned out to display abnormal, i.e. non-dipolar distribution. (nel.edu)
  • Improper disposal of dead animals can result in surface water or groundwater contamination. (missouri.edu)
  • Mine drainage refers to surface water or groundwater becoming contaminated with heavy metals, arsenic, and/or sulfuric acid as the water infiltrates into the mine shafts, pits, coal piles, ores processing structures, and wastes impoundments, such as mine tailings piles and disposal ponds [ 12 , 13 ]. (hindawi.com)
  • Spatial variation of the electrical potential is captured by the system's ability to occupy the same three-dimensional coordinate set for repeated measurements of the desired site. (freepatentsonline.com)
  • In the second step, these magnetic particles are made detectable by applying a magnetic field - known as a drive field - which gives them a magnetic resonance of their own, rendered by 3D-imaging software as spatial maps of the body. (epo.org)
  • Verification of high arsenic contamination was made by collection samples and analysis of arsenic content and interpolation surface by spatial anisotropic method. (hindawi.com)
  • Interpolation surface of the analysed arsenic content using spatial anisotropic would verify the potential arsenic contamination location obtained from fuzzy overlay outputs. (hindawi.com)
  • Both outputs of the spatial surface anisotropic and the fuzzy overlay mapping were significantly spatially conformed. (hindawi.com)
  • The structure of a surface can be inferred from its morphology, which allows the spatial interpretation of surface features and, with additional topographic information, of their quantitative three-dimensional characteristics like slopes, depths, volumes etc. (dlr.de)
  • The EDL model represents the sources by a current dipole layer on the whole myocardial surface, including inner cavities. (springer.com)
  • Our method exploits the solution representation in the form of electrical single layer densities on the myocardial surface. (frontiersin.org)
  • The database includes information about surface water bodies (number and size, water body category, ecological status or potential, chemical status, significant pressures and impacts, and exemptions) and about groundwater bodies (number and size, quantitative status, chemical status, significant pressures and impacts, and exemptions). (europa.eu)
  • The maps include the River Basin Districts (RBDs) and their sub-units, the surface water bodies (water body category, ecological status or potential and chemical status), the groundwater bodies (aquifer type, quantitative status and chemical status) and the monitoring sites. (europa.eu)
  • The DNR Water Pollution Control program protects the quality of the groundwater and surface water supplies of the state by regulating the disposal of wastewater pollutants. (missouri.edu)
  • Modern sanitary landfills are designed and operated to prevent leaching into groundwater or surface waters. (missouri.edu)
  • Identification of best electrocardiographic leads for diagnosing myocardial infarction by statistical analysis of body surface potential maps. (nih.gov)
  • Real-time measurement and processing of multichannel electrocardiographic (ECG) signals is a prerequisite for body surface potential (BSP) mapping. (prolekare.cz)
  • The heart generates magnetic fields that can be detected by body surface mapping utilizing super conducting quantum interference device sensors giving magnetocardiograms (MCGs). (biomedsearch.com)
  • In contrast, the most sensitive and well-documented response of the human body to extremely low frequency magnetic fields is the induction of flickering visual sensations - the magnetic phosphenes - which are thought to result from the interaction of induced eddy currents with cells in the retina. (encyclopedia.com)
  • iii) By means of novel magneto-seismology we will determine not just the morphology of these localised MHD waveguides (potential or not) but will also construct their 3D magnetic mapping and attempt to determine their heating contribution through spatio-magneto seismology. (jaxa.jp)
  • Our observing setup will allow us to search for simultaneous magnetic (full Stokes) and Doppler signatures of MHD waves and oscillations in QS MBPs and AR pores, and use these waves by means of magneto-seismology to construct 3D magnetic mapping. (jaxa.jp)
  • The interaction between magnetic field and particles, administered to patients in liquid form and safely processed via the body's iron metabolism, offers the potential to mapping arterial pathways and organs in 3D during a wide range of dynamic medical phenomena. (epo.org)
  • Through their magnetic charge, SPIONs deliver detailed images of soft tissue and vascular pathways that are difficult to obtain with other methods such as MRI, which measures water in the human body. (epo.org)
  • Based on the bidomain theory, the body surface potential maps (BSPMs) were calculated for a realistic finite element volume conductor with an anisotropic heart model. (springer.com)
  • We implemented a multi-scale (cell and tissue) in silico approach using a model of the human ventricular action potential, integrated with a model of stochastic 3D spatiotemporal Ca 2+ dynamics, and parameter modification to mimic prolonged QT conditions. (frontiersin.org)
  • Integrated hardware, software, and curriculum systems allow students to record data from their own bodies, animal, or tissue preps to learn principles of life science physiology. (biopac.com)
  • Electroanatomic mapping enables us to get a better perspective of the electrical activation pattern in the failing heart, thereby potentially directing us toward the region of maximal electromechanical delay. (eplabdigest.com)
  • On the device therapy front, electroanatomic mapping facilitates the delineation of the electrical activation pattern of the heart. (eplabdigest.com)
  • This is a type of specialized brain and body scan used to map neural activity in the brain or spinal cord of humans or other animals by imaging the change in blood flow ( hemodynamic response ) related to energy use by brain cells. (wikipedia.org)
  • These effects are not explained by conventional ECG theory but they do explain why body surface ST depression does not localise cardiac ischaemia in humans. (edu.au)
  • In this article we present five such patients and evaluate retrospectively the mechanisms of precordial ST segment elevation on 12 lead surface ECG in these patients. (bmj.com)
  • Jakob Steiner and team use digital elevation models and Landsat imagery in combination with high resolution Planet data to quantify surface elevation changes and flow velocities during a glacial surge of the Khurdopin Glacier. (planet.com)
  • The method uses bipolar signals and facilitates the creation of a color-coded activation map, generated from regional activation timings, which can be superimposed on 3-D chamber geometry. (eplabdigest.com)
  • Focal Impulse and Rotor Modulation (FIRM) mapping and forms of Body Surface Mapping aim to characterize multiple atrial wavelets, macro-reentry and focal sources which have been proposed as basic mechanisms perpetuating AF. (doaj.org)
  • The advantages of MCG over traditional electrocardiograms (ECGs) are increased sensitivity to small signals and lack of conductivity in body tissues, presentation of direct component signals and primary currents. (biomedsearch.com)
  • Surface materials may differ in composition, associated with distinct spectral characteristics. (dlr.de)
  • Body surface potential map data from 361 subjects were used to identify optimal subsets of leads and features to distinguish 184 normal subjects from 177 patients with myocardial infarction (MI). (nih.gov)
  • For references , please go to https://www.eea.europa.eu/data-and-maps/explore-interactive-maps/water-framework-directive-2nd-rbmp or scan the QR code. (europa.eu)
  • In one embodiment, an interpolation algorithm tracks the electrogram data points to produce a map relative to the electrocardiogram data. (freepatentsonline.com)
  • The Tele-epidemiology approach, i.e., 1) intensive ground measurements ( Anopheles larval habitats and Human Biting Rate, or HBR), 2) selection of the most appropriate satellite data (for mapping and extracting environmental and meteorological information), and 3) use of statistical models taking into account the spatio-temporal data variability has been applied in Dakar, Senegal. (plos.org)
  • The task forces was set up in the fields of Water Resources (Ground and Surface Water), Geology, Soil and Land Use, Urban and Rural Studies, Oceanography/Marine Resources/Coastal Studies, Agriculture, Forestry and Cartographic Representation of Data (CARD The task forces submitted the reports on the current information needs and existing conventional information system role of remote sensing NNRMS carries out the following tasks: Mapping of forests and grasslands. (wikipedia.org)
  • The overall patterns of activation in the reference data were reproduced relatively well in the calculated activation time maps. (aalto.fi)
  • Uniform double layer solutions for magnetocardiographic and body surface potential mapping data. (aalto.fi)
  • The mission combined in-water diving and photography with Planet's Dove data in order to map coral reefs and assess the damage they face from military base expansion. (planet.com)
  • Material/Methods: High resolution ECGs were recorded from 64 surface leads. (medscimonit.com)
  • Finally, we compared the pros and cons of the methods and explored their future potentials for cardiology. (egms.de)
  • The potential usefulness of the method may be improved by increasing the depth of light penetration, confirming its accuracy against other methods evaluating cerebral flow cessation, and developing absolute parameters for cerebral perfusion. (diva-portal.org)
  • The high number of measured channels also complicates the possibility to implement advanced methods of ECG signal processing (like BSP mapping) in real-time. (prolekare.cz)
  • The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten seconds). (wikipedia.org)
  • The scientific objectives of the Department of Planetary Geology includes analyses of surface-forming and alteration processes, such as crustal differentiation, volcanism, tectonics, impact cratering, weathering, erosion, material transport, and sedimentation, as well as exobiological questions relating to habitability and water-related environments. (dlr.de)
  • Planetary surfaces are made of solid matter and are affected by endogenic and exogenic processes. (dlr.de)
  • These processes affect the morphology and composition of the surface. (dlr.de)
  • From morphological and topographical information, the quantity of eroded material can be estimated, which is important for understanding surface-forming processes. (dlr.de)
  • Additional to classifications like this, comparative studies are important for interpreting surface processes on planetary bodies. (dlr.de)
  • Prolongation of the QT interval of the electrocardiogram (ECG), underlain by prolongation of the action potential duration (APD) at the cellular level, is linked to increased vulnerability to cardiac arrhythmia. (frontiersin.org)
  • To assess the risk of VT, the following parameters were proposed: correlation coefficient between STT and QRST integral maps (STT_QRST_CORR), departure index of absolute value of STT integral map (STT_DI), and departure index of absolute value of T-wave shape index (TSI_DI). (medscimonit.com)
  • These new parameters were compared to known parameters: QRS width, QT interval, QT dispersion, Tpeak-Tend interval, total cosines between QRS complex and T wave, and non-dipolar content of QRST integral maps. (medscimonit.com)
  • P wave changes in body surface potential maps due to increasing heart rate during exercise in normals. (nii.ac.jp)
  • The electromagnetic fields originating from electrical activity of the heart are attenuated in the body volume and only low-resolution information content can be detected on the thorax surface. (springer.com)
  • In the former model, the current sources inside the heart are replaced by potential sources on a surface that encompasses the whole heart (the pericardium). (springer.com)
  • In one embodiment, the mapping system tracks the spread of excitation in the heart, with properties such as propagation velocity changes. (freepatentsonline.com)
  • However, such an examination is necessary to exclude other potential cardiac causes of syncope or cardiac arrest in an otherwise healthy patient (eg, heart murmurs from hypertrophic cardiomyopathy or from a valvular or septal defect). (medscape.com)
  • The normal initiation and orderly propagation of the cardiac impulse through the heart requires a tightly orchestrated sequence of changes in ionic currents that sum to produce the dynamic and phasic change in membrane potential referred to as the cardiac action potential (Figure 1 ). (jci.org)
  • Message Body (Your Name) thought you would like to see the Heart and Circulatory Physiology web site. (physiology.org)
  • Furthermore, we show a uniform spatio-temporal behavior of the single layer densities over the heart surface, which could be conveniently employed in the regularization procedure. (frontiersin.org)
  • Body surface potential maps were obtained in 50 normal adults using the heart potential map system designed by Yamada. (semanticscholar.org)
  • Strain mapping was validated, for the first time, as a semi-quantitative method for the assessment of systolic strain, and showed excellent correlation with quantitative strain values. (helsinki.fi)
  • Strain values can be quickly and accurately estimated by the strain-mapping method, validated now for the first time in the assessment of infarct transmurality. (helsinki.fi)
  • Greensite, F., Huiskamp, G.: An improved method for estimating epicardial potentials from the body surface. (springer.com)
  • 3,5,6,16-18] Also, some foot standing bare foot and the weight of the body equally dimensions have been used to estimate stature in many distributed on both feet using Kanchan's method populations using regression formulae derived from [Figure 2]. (who.int)
  • Assessment of body surface potential mapping in diabetic patients with recognized depression. (nel.edu)
  • Touch allows organisms to obtain, with a degree of precision, points of tactile stimuli at the body's surface. (newworldencyclopedia.org)
  • Body surface potential mapping of ST segment changes in acute myocardial infarction. (ahajournals.org)
  • Whenever delayed epicardial electrograms were recorded, filtered signal-averaged leads showed microvolt-level potentials early in the S-T segment that were continuous with the QRS complex. (physiology.org)
  • This study describes a practical approach for the extraction of diagnostic information from body surface potential maps. (nih.gov)
  • In this study a robust operational methodology for entomological malaria predictive risk maps in urban settings is developed. (plos.org)
  • This study demonstrates that microvolt-level potentials arising from delayed ventricular activation can be reliably detected on the body surface, even when they occur just after the QRS complex. (physiology.org)
  • Published today in Nature , the study also revealed key differences in the way blood vessels develop in tumours, opening up new potential for targeted cancer treatments. (gosh.nhs.uk)
  • The aim of this article is to present a pilot case study in the area of body surface potential mapping. (vutbr.cz)
  • Using the Yukon Flats in Alaska as the test study area, Sarah Cooley and colleagues evaluated the potential scientific utility of the Planet Dove constellation for hydrologic modeling and research. (planet.com)
  • Realistic simulated body surface potential maps. (informer.com)
  • Strain mapping proved as good as quantitative strain in distinguishing transmural from non-transmural infarcts. (helsinki.fi)