Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Body Surface Potential Mapping”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMed1992

Conservation and characterisation of spatial features in a new method of data compression for body surface potential maps.

Body surface potential maps consist of a huge amount of data represented as a series of three-dimensional maps, which are time consuming to process and expensive to store. In spite of the continuous interest in body surface potential maps, their use has not become common and they are of no practical use in the clinics. This is due to the overwhelming amount of measured data required to generate the maps and the lack of quantitative methods to analyse them. Data compression or reduction may solve these deficiencies. Such a procedure must conserve the fine spatial details of the maps, which are usually extracted from low level surface potentials, as these are reported to be significant in diagnostic electrocardiography. A technique is presented for data reduction, that implements two-level thresholding and conserves the fine significant spatial features of each map. A sequence of annuli thus produced is shown to describe the dynamic nature of the underlying process. This sequence is further processed and characterised by features which quantify its dynamic behaviour: time of annuli sequence appearance, its duration, three-dimensional loci of centres of mass of the annuli, distances between successive centres of mass and cross-correlation coefficients between successive annuli. To test the data reduction procedure and the usefulness of the features, maps from 20 subjects are studied (both normal patients and those with various pathologies). It is found that the use of annuli instead of the whole measured information allows simple storage, display and calculations; the features, which vary in time, represent closely the changes in location of the annuli and their dynamic variations of shape. The features are also found to be grouped together for the maps of the normal patients and for each pathology. Thus, body surface potential maps may become more commonly used in clinics by being represented by a set of features, which conserve their dynamic and spatial nature, and which may serve for classification of cardiac pathologies.

Action Potentials↗
PubMed1988

Respiration and the ECG: a study using body surface potential maps.

Body surface potential maps and an eccentric spheres model of the heart were used to investigate some of the factors that cause the surface ECG to change with respiration. Although the pattern of the surface maps shifted inferiorly with inspiration, the pattern itself did not change significantly, even with deep respiratory movements. However, the temporal ECGs at specific electrodes changed dramatically. The model simulations show that the contribution to the change in amplitude of the surface potential due to lung conductivity and ventricular volume changes is small. It is suggested that the major cause of the surface potential changes with inspiration is due to the change in heart position.

Adult↗
PubMed1995

[Body surface potential mapping system].

Body surface potential mapping systems have been developed by several laboratories in our country as well as many other countries all over the world. In most laboratories the basic procedure is the same. Body surface potentials are measured simultaneously using a multiplexer with or without sampling bold, with Wilson's central terminal and stored on a floppy disk in a digital form. Editing for waveform and drift of the baseline was performed in each leads and invalid leads were interpolated from surrounding leads values. Then, different types of maps such as isopotential map, isointegral map, isochronal map and departure map suitable for each clinical evaluation are constructed automatically. However, although body surface mapping provides detailed information about cardiac electrical activity, its clinical use has been limited by the following reasons summarized by B. Taccardi in 1985. 1) Lack of standardization: Different electrode replacement prevents comparing the results. 2) The equipment is comparably expensive. 3) Application of electrode is time-consuming. 4) Analysis of data is not standardized. Further clinical studies may improve some of above described difficulties. And the availability of high performance microcomputers and clinically acceptable electrodes are essential.

Body Surface Potential Mapping↗
PubMed1986

Body surface potential maps in old inferior myocardial infarction. Assessment of diagnostic criteria.

We assessed the accuracy of criteria for diagnosing an inferior myocardial infarction from body potential maps. Body surface potential maps were recorded from 140 lead points on the entire chest surface in three groups of subjects: group A consisted of 15 patients with an old inferior myocardial infarction and typical electrocardiographic signs of necrosis; group B consisted of 15 patients with an old inferior myocardial infarction, but without electrocardiographic signs of necrosis (inferior myocardial infarction was documented during the acute phase); group C consisted of 30 healthy controls. In each subject body surface potential distributions were examined every 2 msec of the QRS complex. Moreover, the potential-time integrals relating to three intervals (QRS, the first 20 and the first 40 msec of the QRS complex) were calculated at each lead point and transferred to diagrams representing the thoracic surface explored (isointegral maps). For each time interval, the mean isointegral map obtained from group C subjects was subtracted from the isointegral map of each patient. The value obtained at each lead point was then divided by the standard deviation of the normal values for that point; the resulting values indicating the standardized differences from normal values were transferred to another map (deviation index isointegral map, DI map). We considered a reliable index of inferior myocardial infarction an area where the time-integral values were at least 2 SD lower than normal, in the inferior half of the thorax. A number of variables relative to instantaneous potential distribution and to isointegral maps were considered. The DI maps of the first 40 msec of QRS gave the most accurate criteria; in fact, an area of negative values 2 SD lower than normal was found in all group A patients and in 11 out of 15 group B patients (sensitivity 100% in group A, 73% in group B and specificity, 83%). Thus our results indicate that body surface potential maps have greater diagnostic information content than the 12 standard electrocardiographic leads and demonstrate the usefulness of the time integral analysis of body surface potentials for diagnostic interpretation.

Adult↗
PubMed1993

Pace mapping using body surface potential maps to guide catheter ablation of accessory pathways in patients with Wolff-Parkinson-White syndrome.

BACKGROUND. A pace mapping technique using body surface potential maps (BSPMs) was developed to guide the positioning of an ablation catheter at the ventricular insertion point of accessory pathways (AP) in patients with the Wolff-Parkinson-White syndrome (WPW). METHODS AND RESULTS. The study was performed on 30 WPW patients. BSPMs were recorded with 63 leads distributed over the entire torso surface. The catheter used for radiofrequency ablation was first placed in the vicinity of the ventricular preexcitation site predicted by BSPMs recorded during the delta wave. BSPMs were then recorded during pacing with this catheter, the comparison between the preexcited and paced BSPMs indicated whether the pacing site was too anterior or posterior with respect to the preexcitation site, and the catheter was moved accordingly. This process was repeated until the preexcited and paced BSPMs were highly correlated (r > or = 0.8), and ablation then was attempted. It was possible to successfully ablate the AP in 28 patients after an investigation that lasted 54 +/- 44 minutes between the recording of the first paced BSPM and that of the BSPM paced at the successful ablation site. Patients with left free wall pathways needed less investigation time compared with patients with pathways of other locations (46 +/- 9 versus 100 +/- 25 minutes, p = 0.031). The sensitivity of BSPM pace mapping was assessed using pacing with a multipolar catheter, and significant changes were observed on the BSPMs for beats with pacing sites that were only 5 mm apart. CONCLUSIONS, BSPM pace mapping allowed us to achieve a 93% success rate with short investigation durations, provides significant information that cannot be obtained with the standard 12-lead ECG, is a self-correcting procedure that reduces the importance of BSPM alterations due to individual differences in the shape of the torso or heart, and is applicable only to patients with AP showing antegrade conduction.

Adolescent↗
PubMed1979

Distinguising features of left anterior fascicular block and inferior myocardial infarction as presented by body surface potential mapping.

Total body surface maps obtained from 19 patients with previous inferior myocardial infarction (IMI) were compared with maps obtained from 19 patients with left anterior fascicular block (LAFB) and six more patients in whom electrocardiographic changes were indistinguishable between IMI and LAFB. Three distinguishing features were detected: 1) abnormal high anterior positivity developed both in IMI and LAFB, but its onset was earlier in LAFB; 2) a broad rim of abnormal right lower negativity was seen in both groups, but in IMI it was within the first 40 msec, whereas in LAFB it was found in the middle and later parts of depolarization; 3) abnormal left lower negativity was seen in all the patients with LAFB, but was absent in IMI. Thus, despite similarities in the abnormalities detected, we found definite temporal and topographical differences that should aid in differentiating between IMI and LAFB in ambiguous cases.

Action Potentials↗
PubMed1985

Identification of best electrocardiographic leads for diagnosing myocardial infarction by statistical analysis of body surface potential maps.

This study describes a practical approach for the extraction of diagnostic information from body surface potential maps. 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). Multivariate analysis was performed on 120-lead data, using as features instantaneous voltage measurements on time-normalized QRS and STT waveforms. Several areas on the map, most of which were located outside the precordial region, contained leads with important discriminant features; 2 of the 3 limb leads (aVR and aVF) also exhibited high diagnostic capability. A total of 6 features (mostly STT measurements) from 3 locations accounted for a specificity of 95% and a sensitivity of 95%; these were the right subclavicular area, the left posterior axillary region and the left leg. As a comparison, the same number of features from the standard 12-lead electrocardiogram yielded a sensitivity of 88% for a specificity of 95%. To investigate the repeatability of the results, the entire population was separated into a training set (100 normal subjects and 100 patients with MI) and a testing set (84 normal subjects and 77 patients with MI); computing a discriminant function on the training set and applying it to the testing set only moderately deteriorated the diagnostic classification. It is concluded that this approach achieves efficient information extraction from body surface potential maps for improved diagnostic classification.

Adult↗
PubMed1991

Clinical efficacy of PTCA and identification of restenosis: evaluation by serial body surface potential mapping.

We used serial body surface potential mapping (BSPM) with the departure map technique to evaluate the clinical efficacy of percutaneous transluminal coronary angioplasty (PTCA) in various pathophysiologic stages of coronary artery disease, and to detect restenosis. The BSPM was performed prior to, 1 week after, and 1 month after PTCA. A follow-up coronary angiography was performed 3 to 6 months after PTCA, and BSPM was also performed at the same time. The results of BSPM were compared with those of thallium-201 single-photon emission computed tomography (Tl-201 SPECT) and radionuclide ventriculography. After PTCA, BSPM showed a significant reduction in the departure area, the Tl-201 SPECT also showed a significant reduction in the extent and severity scores, and the left ventricular ejection fraction improved significantly. In the cases with restenosis, the departure area, which had decreased in size after PTCA, showed an increase in size. After successful re-PTCA, the size of the departure area again became smaller. We concluded that BSPM, which is a simple, noninvasive, and inexpensive method, is useful in the evaluation of the clinical efficacy of PTCA and in the detection of restenosis after successful PTCA.

Adult↗
PubMed1993

Clinical use of body surface potential mapping in cardiac arrhythmias.

Body surface potential maps have and certainly will have a very important role in the field of clinical arrhythmology, specifically for the localization of accessory pathways, for the detection of the origin of ventricular arrhythmias and for the identification of patients at risk of sudden death. In this particular setting, surface maps are certainly more useful than other more costly and sophisticated imaging techniques.

Arrhythmias, Cardiac↗
PubMed1989

Sources of variability in normal body surface potential maps.

Within-group variability of body surface potential maps was assessed on data from 685 carefully validated normal subjects (348 men and 337 women). Sources of within-group variability were evaluated by subgrouping maps by patient sex, age, height, and weight. Contribution of reproducibility error to total variance was assessed in a separate group of 52 normal subjects in whom multiple maps were recorded. Total variance was significantly lower in women than in men. Total variance tended to decrease with age, and the greatest decrease occurred in men during the 3rd decade. The ratio of total variance to mean signal energy showed a slow decrease with age for each group. Results suggest that the dominant source of within-group variability arises from variability of cardiac electric sources while the influence of volume conductor variability is significantly less. Variability due to measurement reproducibility was approximately half of the total variance.

Adult↗
PubMed1989

Analysis of the hypoplastic right ventricle utilizing electrocardiographic body surface potential mapping (BSPM).

The authors present electrocardiographic body surface potential maps (BSPMs) of 11 patients with hypoplastic right ventricle (HRV) of three types: type I, HRV with pulmonary atresia; type II, HRV with tricuspid atresia; and type III, HRV with tricuspid artesia and transposition of the great arteries. The BSPMs of all 11 patients demonstrated evidence for epicardial right ventricular breakthrough, indicating conduction through an intact right bundle branch and Purkinje system. Nonetheless, the BSPMs strongly suggested profound morphological, probably embryological, differences among the right ventricles of the three groups. The four patients with type I HRV had no evidence for conduction abnormality. The five patients with type II, HRV however, had very marked conduction abnormality. In four of these five, the standard ECG and VCG had initial forces suggesting left lateral wall myocardial infarction. The BSPMs showed no evidence for infarction but demonstrated very complicated slow initial activation, explaining why the initial QRS vector was to the right and posterior before extending leftward. In addition, in all five the initial positive potentials were unusually inferior and the initial negative potentials unusually superior. After the evidence for epicardial right ventricular breakthrough, the positive and negative potentials rapidly changed positions so that the positive potentials were unusually superior and the negative potentials unusually inferior, consistent with the BSPM of endocardial cushion defects. In four of these five there was marked delay of total ventricular activation time. Of the two patients with type III HRV, one had an initial QRS similar to that of type II. Neither had rapid change of inferior and superior positive and negative potentials after right ventricular breakthrough, and both had intraventricular slowing, one with partial left bundle branch block.

Adolescent↗
PubMed1989

Diagnostic body surface potential map patterns in left ventricular hypertrophy during PQRST.

Body surface potential maps were recorded from 117 thoracic sites and 3 limb electrodes in 173 normal subjects older than 30 years of age and 122 patients with clinically "pure" left ventricular (LV) hypertrophy. Typical LV hypertrophy map patterns were identified at successive instants during the PQRST waveform by removing from sequential LV hypertrophy maps the corresponding normal variability range at each electrode site. The presence in individual patients of 1 or more patterns typical in time and location of LV hypertrophy allowed retrospective assignment to the LV hypertrophy group. The most consistent discriminant patterns were excessive negative voltages in the anterior torso with reciprocal excess of positive voltages in the upper right chest during the second half of the P wave, excessive negative voltages in the lower right anterior torso at mid-QRS and excessive negative voltages in the left precordium with reciprocal excess of positive voltages in the upper right chest throughout ST-T. Best classification results were achieved with ST-T features, followed by features from the P wave, the QRS waveform and the PR segment. Cumulative use of ST-T and P features yielded a specificity of 94% with a sensitivity of 88%. Little improvement was obtained by the addition of QRS and PR information. The discriminant map criteria were applied to body surface potential maps from 169 new subjects (77 normal subjects ages 20 to 30 years and 92 patients with complicated LV hypertrophy). Little modification in specificity (93%) and sensitivity (90%) was observed. The performance of commonly used standard lead criteria was also tested.(ABSTRACT TRUNCATED AT 250 WORDS)

Action Potentials↗
PubMed1995

[Dipole analysis of data base for body surface potential maps of normal population].

The dipolarity of the body surface potential distribution and locus of the main dipole were estimated by means of the least square method in data base for body surface potential maps of normal population. The main dipole moved smoothly within the actual cardiac region and was inscribed in a clockwise direction during the QRS. The nondipolar content (residue) showed time-dependent fluctuation the QRS. The main dipole during the T wave moved near the center of the heart. The nondipolar content during the ST-T period was less fluctuation than that during the QRS. These results indicated that a large percentage of the body surface potential maps of normal population could be represented by a single moving dipole.

Aging↗
PubMed1987

Localization of significant coronary arterial narrowings using body surface potential mapping during exercise stress testing.

The ability of body surface potential mapping to localize coronary arterial narrowings during exercise stress testing was investigated. An array of 48 chest wall electrodes, simultaneously recorded, was used. Digital filtering and signal processing, data reduction techniques and discriminant analysis were applied to process the information. Forty patients whose coronary angiograms showed a single significant narrowing of either the left anterior descending or right coronary artery were selected for further study. On the basis of body surface potential mapping, the site of coronary arterial narrowing was correctly classified in 88% of the patients.

Coronary Disease↗
PubMed1993

Body surface potential maps of ventricular depolarization in normal adults.

Body surface potential maps were obtained in 50 normal adults using the heart potential map system designed by Yamada. Group A (younger adult group) consisted of 30 persons whose ages ranged from 20 to 39 years. Group B (middle-aged group) included 20 persons whose ages ranged from 40 to 59 years. Although there were slight variations in the pattern of isopotential distribution among the subjects studied, a consistent pattern with a similar sequence was observed in both study groups. However, there were some parameters which significantly differed between groups A and B, including the earliest appearance time of the anterior negative potential (p < 0.05), the anterior potential minimum (p < 0.001), the posterior positive potential (p < 0.001), the midsternal minimum (p < 0.001), the largest potential minimum (p < 0.05), the largest potential maximum (p < 0.005), the "reversal" pattern (p < 0.001), the multipolar potential distribution in the upstroke (p < 0.001) and the amplitude of potential minimum in the periods 50 msec (p < 0.005) and 60 msec (p < 0.01) of ventricular depolarization. Accordingly, the data obtained regarding the time relationship between the bipolar and multipolar phases, the distribution and time course of the potential as well as the dynamic changes in potential voltage, particularly the age-related potential pattern will serve as a basis for further study of BSPM.

Adult↗
PubMed1990

The value of body surface potential maps in assessment of experimental myocardial infarction.

Body surface potential maps (BSPMs) and the pathology of 32 dogs with coronary artery ligations were analyzed to research the application of BSPMs to acute myocardial infarction (AMI). The group consisted of 18 dogs with left anterior descending coronary artery (LAD) ligations, 8 with right coronary artery (RCA) ligations and 6 with left circumflex coronary artery (LCX) ligations. The abnormal distribution of negative potential and minimal potential were observed in all of the dogs. In dogs with RCA ligations, the abnormal negative potential displayed on the right-superior, right-inferior or right portion of the anterior thorax. In those with LAD ligations, the abnormal potential appeared on the left-superior, left-inferior, middle-superior or middle portion of the anterior thorax. In those with LCX ligations, the abnormal potential showed on the left-superior or left-middle portion of the thorax. A good correlation was observed between the area of myocardial lesion and the extent of abnormal negative potential distribution (r = 0.82, p less than 0.001). A close correlation was also found between the area of myocardial lesion and the duration of abnormal negative potential (r = 0.61, p less than 0.05). This study suggests that BSPMs are useful in the assessment of AMI in terms of diagnosis, location and extent of myocardial infarct.

Animals↗
PubMed1994

Remodeling in myocardial infarction and body surface potential maps.

This study deals with the capabilities of body surface integral and departure maps to evaluate the chronic stage of myocardial infarction based on dividing the left ventricle into 12 segments. The effects of ventricular remodeling on electrocardiographic potential distributions are considered. A 61-year-old male patient was examined five times by body surface potential mapping during a period of 9 months after acute myocardial infarction. Integral maps were calculated for 60 ms after QRS onset and compared with mean data from a control group using departure maps. Integral maps showed a continual reduction of negative potentials in the lower half of the torso with time. The negative area covered the lower torso in the departure maps during the whole study, but its form and value changed. According to the location of the departure area, the surface projection of the scar moved from a position corresponding to inferior segments to a position corresponding to posterior segments. Its size also decreased. Echocardiographic examinations showed progressive enlargement of both ventricles with time. Therefore, the authors postulate that the changing pattern of body surface potential maps was mainly influenced by ventricular remodeling after myocardial infarction.

Electrocardiography↗