Computers in Cardiology 1997最新文献_第2页

An application of self-organising maps for a knowledge base for use in cardiac domain 自组织地图在心脏领域知识库中的应用

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648013

M.C. Teucci, G. Braccini, C. Carpeggiani, C. Marchesi

{"title":"An application of self-organising maps for a knowledge base for use in cardiac domain","authors":"M.C. Teucci, G. Braccini, C. Carpeggiani, C. Marchesi","doi":"10.1109/CIC.1997.648013","DOIUrl":"https://doi.org/10.1109/CIC.1997.648013","url":null,"abstract":"The conception, project realisation and updating of hospital information systems (HISs) rely on specific standardisation procedures. Particularly important is the momentum that technology is giving to the production of computer-assisted clinical documentation. Developing such a task, which includes issues like specific diagnostic reports as well as a total clinical record, requires making explicit the syntactic and semantic relationships among the data that describe the patient's health. Our study tackles the realisation of a knowledge-based clinical record designed as a combination of modules depending on a set of main medical concepts. We have heuristically defined the knowledge base's content, which has a frame-based structure, through the self-organising map (SOM) technique. We have used the SOM approach for its intrinsic capability of grouping the words of a text according to the semantic categorisations of the natural language. A set of 30 reports, referring to patients afflicted with cardiac diseases and written in the Italian language, gives us the experimental setting that we have used to train the SOM and to obtain the knowledge base. The lists of words which activate the different nodes of the SOM are assumed as frames of the required knowledge base. Performance evaluation shows that this method gives us a representation of the medical knowledge that is efficient for producing meaningful clinical sentences. Moreover, this approach is of general interest: in fact, it works independently of the language used for writing clinical documents.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121949578","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: 3

Effects of hyperpolarizing pulses on a cardiac pacemaker cell 超极化脉冲对心脏起搏器细胞的影响

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648150

S. Demir, J. Clark, W. Giles

引用次数: 3

Effects of signal compression on quantitative assessment of myocardial structure in digitally stored 2D echocardiographic images 数字存储二维超声心动图图像中信号压缩对心肌结构定量评估的影响

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647862

E. Ferdeghini, M.A. Morales, M. Piacenti, T. Cerrai, A. Distante, Q. Maggiore

引用次数: 0

A database for evaluation of algorithms for measurement of QT and other waveform intervals in the ECG 一个用于评估心电图中QT和其他波形间隔测量算法的数据库

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648140

P. Laguna, R. G. Mark, A. Goldberg, George Moody

引用次数: 574

Computer simulation for improved assessment of mitral regurgitation 改进二尖瓣返流评估的计算机模拟

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647857

M. Karlsson, J. Brandberg, B. Wranne, P. Ask, D. Loyd

引用次数: 1

DFT changes in a RV active can (AC) defibrillator due to AC position variations and smaller AC size are reduced by adding a subcutaneous coil electrode 在RV有源罐(AC)除颤器中，由于交流位置变化和更小的交流尺寸而引起的DFT变化可以通过添加皮下线圈电极来减少

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647838

K. Smits, M. Malík, F. Lindemans

{"title":"DFT changes in a RV active can (AC) defibrillator due to AC position variations and smaller AC size are reduced by adding a subcutaneous coil electrode","authors":"K. Smits, M. Malík, F. Lindemans","doi":"10.1109/CIC.1997.647838","DOIUrl":"https://doi.org/10.1109/CIC.1997.647838","url":null,"abstract":"A finite difference computer model was used to simulate defibrillation threshold (DFT) and impedance for an Active Can (AC) defibrillator with a 5 cm long right ventricular (RV) electrode. The effects of adding a single subcutaneous (SQ) 25 cm coil electrode to AC were calculated. The efficiency of a configuration was based on the 90 percentile of myocardial current density. Effects of natural variations simulated by variations of RV electrode positions. Clinical results from RV-AC systems (DFT=13J, Z=50.4 /spl Omega/) were used to derive model constants for calculation of DFT. In a factorial experiment DFT, impedance and percentage AC current were calculated for 15 sub-pectoral AC, 12 RV; and 6 SQ positions, resulting in a total of 1260 combinations. Reduction of projected AC size from 37 to 22 and 13 cm/sup 2/, combined for all positions of RV and AC without SQ, resulted in a DFT increase from 13.0/spl plusmn/4.6 to 14.7/spl plusmn/5.3 and 16.5/spl plusmn/5.8 J, and a shock impedance rise from 50.4/spl plusmn/1.5 to 59.0/spl plusmn/2.0 and 68.4/spl plusmn/1.7 /spl Omega/, respectively. Adding a single SQ at 9 different positions, resulted in the following DFT and impedance values: 6.8/spl plusmn/1.9, 6.5/spl plusmn/1.7 and 6.4/spl plusmn/1.5 J; 43.1/spl plusmn/2.5, 46.5/spl plusmn/2.4 and 49.3/spl plusmn/2.4 /spl Omega/, for AC sizes of 37, 22, and 13 cm/sup 2/, respectively. For 5 different AC positions, the DFT without SQ ranged from 10.7/spl plusmn/2.8 J in the most lateral AC positions to 32.1/spl plusmn/10.7 J in the most mid line AC position, and with one SQ combined at 9 positions from 5.8/spl plusmn/1.3 J to 8.4/spl plusmn/2.2 J respectively. Thus addition of one 25 cm SQ to AC of an RV-AC defibrillation system abolishes DFT rise due to AC size reduction and achieves the largest DFT reduction for the most unfavorable AC position.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"41 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132576846","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

Assessment of information redundancy in ECG signals 心电信号中信息冗余的评估

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648153

B. Açar, L. Ozcakir, H. Koymen

引用次数: 0

System identification of atrial activation during chronic atrial fibrillation in man 慢性心房颤动患者心房活动的系统识别

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647901

Rolf Johansson, M. Holm, S. Olsson, J. Brandt

引用次数: 7

An integrated processing program for analysis of left ventricular function and perfusion 一个综合处理程序分析左心室功能和灌注

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648146

T. Faber, C. Cooke, R. Folks, J. Vansant, J. Klein, E.V. Garcia

引用次数: 4

Non-baroreflex mediated heart rate variability causes overestimation of baroreflex sensitivity 非压力反射介导的心率变异性会导致压力反射敏感性的高估

Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647865

J. Frederiks, C. A. Swenne, B. J. Tenvoorde, N. Honzikova, J.V. Levert, A. Maan, M. Schalij, A. Bruschke

引用次数: 5