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[1989] Proceedings. Computers in Cardiology最新文献

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A model of left ventricular contraction and transmural ventricular deformation 左心室收缩和跨壁心室变形模型
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130468
R. Beyar, S. Sideman
{"title":"A model of left ventricular contraction and transmural ventricular deformation","authors":"R. Beyar, S. Sideman","doi":"10.1109/CIC.1989.130468","DOIUrl":"https://doi.org/10.1109/CIC.1989.130468","url":null,"abstract":"The authors present a thick-wall ellipsoidal model of the left ventricle (LV) that takes into account its fiber structure in parallel with the well-known physiological properties of the muscle fibers and was constructed to describe both the transmural and global features of ventricular contraction. The model describes systolic function utilizing the force-length and force-velocity relationship of the fibers. The local oxygen consumption is simulated assuming a linear relationship with the area of the stress-length loop and the triangle between the loop and the maximum active force formed locally for each fiber. The model yields the transmural distribution of oxygen demand as a function of the loading conditions, and accounts for twist of the LV over its long axis during ejection. Thus, the model of LV function provides a comprehensive analytic tool to study the complex interactions between parameters of the ventricular function.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127679012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Reconstruction of body surface potential maps based on measurement of level-crossing instants 基于平交道口瞬时测量的体表电位图重建
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130517
I. Vitsnudel, D. Adam
{"title":"Reconstruction of body surface potential maps based on measurement of level-crossing instants","authors":"I. Vitsnudel, D. Adam","doi":"10.1109/CIC.1989.130517","DOIUrl":"https://doi.org/10.1109/CIC.1989.130517","url":null,"abstract":"An alternative measurement system for body surface potential mapping (BSPM) based on detection of potential level-crossing instants is proposed. If feasible, such a system may significantly simplify the technical complexity of BSPM instrumentation. This measurement system is based on consideration of the dynamic nature of the heart activation process. An array of 10*18 ECG (electrocardiography) electrodes, placed on the torso as a net, registers instants of level crossings. These measurement points comprise a nonuniform sampling set of the BSPM function. This partial information is used as the data for the reconstruction algorithm, which estimates the original BSPM function. At present, the study group is limited to 25 patients (including normals, as well as different pathologies). The group is actually too small for proper reconstruction of BSPM function, but even with this small number of patients good estimation of the ECG waveform was indicated by simulations.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127755850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Continuous computer-assisted electrocardiographic monitoring in patients with acute myocardial infarction: early experience 急性心肌梗死患者的连续计算机辅助心电图监测:早期经验
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130520
M. Krucoff, M. Croll, L. Pendley, D. L. Burdette, J. Pope, D. Hutchinson, J. S. Stone, R. Weber, R. Califf
{"title":"Continuous computer-assisted electrocardiographic monitoring in patients with acute myocardial infarction: early experience","authors":"M. Krucoff, M. Croll, L. Pendley, D. L. Burdette, J. Pope, D. Hutchinson, J. S. Stone, R. Weber, R. Califf","doi":"10.1109/CIC.1989.130520","DOIUrl":"https://doi.org/10.1109/CIC.1989.130520","url":null,"abstract":"Results of 3311 h of continuous digital 12-lead ST segment monitoring in a pilot population of 77 patients treated early in myocardial infarction (MI) with thrombolytic therapy are reported. 'Mean beat' signal processing over 353 min of monitoring in 12 patients subjected to normal flight vibration during helicopter transport was compared with 390 min of monitoring in 12 patients in the coronary care unit (CCU). Automated ST episode detection triggered 15 episodes in helicopter and 19 episodes in CCU, of which 3/15 (20%) and 7/19 (37%) were artifact, respectively. From the 77 patients overall, ST trend evidence of changes in infarct vessel patency was noted more than twice in 38 (49%), more than four times in 21 (27%), and more than six times in 11 (14%). ST evidence of patency change occurred from 30 s to 47.6 h apart. It is concluded that mean beat signal processing can provide technically adequate ECG monitoring information even with a vibrating signal source during helicopter transport and that continuous ST monitoring may be useful for detecting changes in infarct vessel patency occurring outside the brief time window of acute angiography.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"28 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131575576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Voice activated editing of diagnostic ECGs 声控编辑诊断性心电图
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130487
C. Lassvik, J. Tranesjo, N. Areskog
{"title":"Voice activated editing of diagnostic ECGs","authors":"C. Lassvik, J. Tranesjo, N. Areskog","doi":"10.1109/CIC.1989.130487","DOIUrl":"https://doi.org/10.1109/CIC.1989.130487","url":null,"abstract":"In Sweden the editing of unconfirmed, automatically classified reports in a computer-based ECG management system is often done by physicians with relatively little typewriter experience. It is suggested that input devices other than the terminal keyboard might speed up and make more enjoyable the editing procedure for these physicians. A voice recognition system was tested and showed approximately a 10% failure in recognizing a short list of various ECG statements. The main reasons for this were a nonoptimal microphone technique and many phonetically similar phrases. After minimizing these sources of error, a clinical trial of the voice recognizing system connected to a commercial ECG management system was performed. Preliminary results show that ECG editing using a voice recognition system is feasible, but that technical difficulties must be overcome to achieve a clinically useful system.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131843628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of tachycardia templates for recognition of recurrent monomorphic ventricular tachycardia 使用心动过速模板识别复发性单形态室性心动过速
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130513
R. Throne, J. Jenkins, S. Winston, L. DiCarlo
{"title":"Use of tachycardia templates for recognition of recurrent monomorphic ventricular tachycardia","authors":"R. Throne, J. Jenkins, S. Winston, L. DiCarlo","doi":"10.1109/CIC.1989.130513","DOIUrl":"https://doi.org/10.1109/CIC.1989.130513","url":null,"abstract":"The authors show that the ventricular electrograms of recurrent monomorphic ventricular tachycardia (VT) having an identical 12-lead surface configuration can be matched to a template constructed from a previous episode of the same VT. This could allow assessment of the number of times a device has delivered therapy for a known VT, in addition to the total number of therapies for cardiac rhythms that may have exceeded a rate criterion and/or morphology criterion. Templates constructed during monomorphic VT in 12 patients were examined by means of correlation waveform analysis (CWA) and area of difference (AD). With CWA the VT templates correctly discriminated 902/936 (97%) ventricular depolarizations, and AD correctly discriminated 932/936 (99%) depolarizations when the same VT was reinduced. The study used acute leads positioned during electrophysiologic study and has not been tested or validated on chronic leads. The monomorphic VT was reinduced during a single electrophysiology study. Whether changes in heart substrate or structure may cause changes in the intracardiac VT morphology over time has not been determined.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134091287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Fetal heart rate detection by a special transform method 采用特殊变换法检测胎儿心率
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130542
Y. Tal, S. Akselrod
{"title":"Fetal heart rate detection by a special transform method","authors":"Y. Tal, S. Akselrod","doi":"10.1109/CIC.1989.130542","DOIUrl":"https://doi.org/10.1109/CIC.1989.130542","url":null,"abstract":"A novel method is proposed for the detection of fetal heart rate from abdominal ECG (electrocardiography). The method resembles the computation of a discrete Fourier transform. However, the analyzing functions used have greater correlation with the signal being looked for than the standard sine and cosine functions. The functions are trains of square waves, characterized by the width of the square wave, their periodicity, and some initial phase value. Following the elimination of the maternal ECG contribution to the signal, a triple parametric transform function is computed by multiplying the signal by the analyzing functions and integrating the result. The maximum of the transform obtained this way indicates the average fetal RR interval. Thus the fetal heart rate can be detected. Preliminary application of this method to real and simulated fetal ECG signals is presented. In general, the method can be applied to handle weak, quasi-periodic, sharp signals of various origins.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134008056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
A study to match duration criteria and computer ECG measurements 一项将持续时间标准与计算机心电图测量相匹配的研究
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130601
R. Degani, G. Bortolan, M. Bressan, M. Bettin, S. Cherry
{"title":"A study to match duration criteria and computer ECG measurements","authors":"R. Degani, G. Bortolan, M. Bressan, M. Bettin, S. Cherry","doi":"10.1109/CIC.1989.130601","DOIUrl":"https://doi.org/10.1109/CIC.1989.130601","url":null,"abstract":"The differences between computer and 'conventional' manual ECG (electrocardiography) duration measurements are assessed. The ultimate goal is to adapt duration criteria designed for the visual interpretation of ECGs to analysis by computerized systems. Independently of any diagnostic indication, a set of 100 ECG signals has been used to measure several duration parameters of potential diagnostic significance, such as QRS, P, and Q duration and R peak time. The values obtained by computer (program CARD5) have been compared with the results given by two physicians on conventional gain/speed recordings. Human discrepancies have been resolved through a joint analysis of the difficult cases. The consensus results have been compared with computer values. Almost all differences appear to be statistically significant; however, for the P duration criteria only a correction taking into account the systematic difference is suggested.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130293450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A model of the coronary epicardial tree and intramyocardial circulation in normal and ischemic hearts 正常心脏和缺血心脏冠状动脉心外膜树和心内循环模型
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130534
D. Manor, U. Dinnar, S. Sideman, R. Beyar
{"title":"A model of the coronary epicardial tree and intramyocardial circulation in normal and ischemic hearts","authors":"D. Manor, U. Dinnar, S. Sideman, R. Beyar","doi":"10.1109/CIC.1989.130534","DOIUrl":"https://doi.org/10.1109/CIC.1989.130534","url":null,"abstract":"A dynamic electrical analog RC model describing the coronary circulation was developed to relate the epicardial flow to the corresponding regional perfusion. The model is based on the aortic driving pressure, the left ventricular pressure, the dominant anatomy, and the geometry (length, diameter) of the epicardial coronary arteries. The myocardial zone supplied by each artery is represented as three compartmental resistances and two capacitances, changing with time as a function of transmural pressure. The intramyocardial pressure affects the circulation by means of the myocardial capacitances. The system has the ability to autoregulate in response to increased flow demand or severe stenosis. This model is also capable of accounting for fixed or dynamic stenoses in the epicardial arterial segments, and the corresponding collaterals which may be added as a function of time and stenosis severity. Pressures and flow rates at each arterial segment and myocardial compartment are calculated.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134618825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Automated segmentation of cardiac MR images 心脏MR图像的自动分割
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130525
M. Bister, Y. Taeymans, J. Cornelis
{"title":"Automated segmentation of cardiac MR images","authors":"M. Bister, Y. Taeymans, J. Cornelis","doi":"10.1109/CIC.1989.130525","DOIUrl":"https://doi.org/10.1109/CIC.1989.130525","url":null,"abstract":"Two different algorithms were tested for the segmentation of cardiac MR (magnetic resonance) images. The first is the pyramid segmentation scheme, which was finally rejected owing to severe inherent shortcomings. The second is called the cavity detector and is based on classical image processing techniques. It is especially sensitive to compact objects in the image, even when these are not completely surrounded by walls. The second scheme is robust with respect to changes in the (automatically or a priori defined) segmentation parameters (such as threshold value or mask for distance transform) and has been validated by comparison with manual segmentation by a medical expert.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132585618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 46
Determination of the gain of the baroreceptive mechanisms on heart rate and arterial pressure variability signals 心率和动脉压变异性信号的压力感受机制增益的测定
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130469
S. Cerutti, G. Baselli, L. Biancardi, R. Furlan, Alberto Mailliani, M. Pagani, A. Porta, O. Rimoldi
{"title":"Determination of the gain of the baroreceptive mechanisms on heart rate and arterial pressure variability signals","authors":"S. Cerutti, G. Baselli, L. Biancardi, R. Furlan, Alberto Mailliani, M. Pagani, A. Porta, O. Rimoldi","doi":"10.1109/CIC.1989.130469","DOIUrl":"https://doi.org/10.1109/CIC.1989.130469","url":null,"abstract":"The performance of baroreceptive mechanisms is classically evaluated by measuring the lengthening of the heart period (HP) in response to a symbolic arterial pressure (SAP) rise. The authors present several methods for calculating the gain of the SAP-HP relationship through proper processing of cardiovascular variability signals. The spectral analysis of such signals makes it possible to enhance some parameters which satisfactorily describe the level of control elicited by the sympathovagal balance on cardiovascular functions. The advantages of this approach compared with the classical one, which uses an injection of i.v. vasoconstrictor drug as the input stimulation, are twofold. First, it is possible to measure alpha parameters in the patient even for long periods of recordings (up to 24 h or more) without using drugs which produce a change in the physiological short-term steady-state condition. Secondly, it is possible to use the parameters of cardiovascular variability signals for the design and validation of proper 'black-box' physiological modeling.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114073291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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