2015 Computing in Cardiology Conference (CinC)最新文献_第3页

Far-field effect in unipolar electrograms recorded from epicardial and endocardial surface: Quantification of epi-endo dissociation during atrial Fibrillation in Humans 从心外膜和心内膜表面记录的单极电图的远场效应:人类心房颤动期间外显-内解离的量化

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7410956

P. Podziemski, S. Zeemering, E. Bidar, P. Kuklik, A. Hunnik, U. Schotten

{"title":"Far-field effect in unipolar electrograms recorded from epicardial and endocardial surface: Quantification of epi-endo dissociation during atrial Fibrillation in Humans","authors":"P. Podziemski, S. Zeemering, E. Bidar, P. Kuklik, A. Hunnik, U. Schotten","doi":"10.1109/CIC.2015.7410956","DOIUrl":"https://doi.org/10.1109/CIC.2015.7410956","url":null,"abstract":"In this study we explore whether endo-epicardial dissociation during atrial fibrillation (AF) can explain origin of some of the far-field components in unipolar electrograms. To assess the number of far-field deflections in unipolar electrograms that have a source on the contralateral side of the atrial wall we used simultaneous endo-epicardial high-resolution contact mapping. 30s endo-epicardial electrograms were recorded using two 64 electrode arrays directly opposing each other, placed on the right atrial wall in 5 patients with persistent AF. For all far-field deflections that could not be explained by local activation within the same plane, we searched for a passing wavefront on the other side of the atrial wall. 74±3% of detected far-field deflections could be explained by activation on the same side of the atrial wall. Within the remaining deflections, 42±5% had a source in the activity taking place directly on the other side of the atrial wall. 15±3% of all detected far-fields were of unknown origin. High proportion of the far-field deflections detected using contact mapping during AF results from endo-epicardial dissociation may have an impact on proper annotation of local activity, and therefore on identification of conduction patterns. Calculating the number of far-field deflections in unipolar electrograms due to endo-epi dissociation may help to quantitatively describe transmural dissociation.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126740441","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

Automated detection of left atrium boundary in intracardiac echocardiography during atrial fibrillation ablation 心房颤动消融过程中心内超声心动图左心房边界的自动检测

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408594

Rachele Angeletti, C. Tomasi, Matteo Zimmitti, C. Corsi

{"title":"Automated detection of left atrium boundary in intracardiac echocardiography during atrial fibrillation ablation","authors":"Rachele Angeletti, C. Tomasi, Matteo Zimmitti, C. Corsi","doi":"10.1109/CIC.2015.7408594","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408594","url":null,"abstract":"Intracardiac echocardiography (ICE) is used during radiofrequency ablation (RFA) of atrial fibrillation to visualize and reconstruct left atrium (LA) anatomy and catheter placement, as well as to monitor potential complications, including the most harmful esophageal injuries. However, esophagus' dynamic interface with LA posterior wall (LAPW) can be only roughly depicted by any available echo-based method. In clinical practice, at best, LAPW contour is manually traced (MT) on ICE images by the cardiologist, a procedure which is cumbersome and time-consuming. Accordingly, the present study aimed detecting LAPW position automatically by ICE during RFA. To identify LA borders a procedure based on level-set method and pixel clustering was applied. Algorithm was tested on 9 ICE acquisitions. Two series of LA contours were compared with MT LA boundaries by linear regression, Bland-Altman analysis, Dice coefficient and Hausdorff distance. Mean analysis time was 1 sec/frame. Detected contours were fairly concordant with MT ones. The developed technique permits automated and accurate detection of LAPW and may be the preliminary step towards additional analysis including dynamic quantification of esophagus real-time position' changes and its distance from the LAPW.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115022740","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

Heart Rate Turbulence modeling using Boosted Regression Trees 使用增强回归树的心率湍流建模

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7411079

Ó. Barquero-Pérez, R. Goya-Esteban, A. García-Alberola, J. Rojo-álvarez

{"title":"Heart Rate Turbulence modeling using Boosted Regression Trees","authors":"Ó. Barquero-Pérez, R. Goya-Esteban, A. García-Alberola, J. Rojo-álvarez","doi":"10.1109/CIC.2015.7411079","DOIUrl":"https://doi.org/10.1109/CIC.2015.7411079","url":null,"abstract":"Heart Rate Turbulence (HRT) is a relevant cardiac risk stratification criterion. It is accepted the baroreflex hypothesis as a source of the HRT. However, several studies showed different results about the relationship between coupling interval (CI) and HRT turbulence slope (TS) parameter. Our aim was to propose a nonparametric model based on Boosted Regression Trees (BRT) of TS as a function of CI, heart rate (quantified by sinus cardiac length SCL in ms), Age and Sex. We used a set of 11 patients with normal heart undergoing electrophysiological study (EPS) and 61 holters from actue myocardial infarction (AMI) patients (Hospital Arrixaca de Murcia). The AMI set was split into: AMI low-risk, and AMI high-risk according to HRT. We propose to model TS using BRT, which is an ensemble approach to build a regression model using several trees. SCL was the explicative variable with the highest importance both in EPS and AMI low-risk. TS correlated nonlinearly with SCL, and negatively with CI both in EPS and AMI low-risk. The model was completely different for AMI-HR. R2 was higher for EPS (0.63) and AMI-LR (0.38) than for AMI-HR (0.28). The model was in agreement with the baroreflex hypothesis, and the role of age and sex agrees with previous results for EPS and AMI-LR. CI was the most important variable and positively correlated with TS in AMI-HR.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115103686","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

Teager energy based approach to detect atrial peaks to predict atrial fibrillation recurrence 基于青少年能量的心房峰检测方法预测心房颤动复发

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7410959

R. Abad, J. Moreno, J. Millet-Roig, F. Castells

{"title":"Teager energy based approach to detect atrial peaks to predict atrial fibrillation recurrence","authors":"R. Abad, J. Moreno, J. Millet-Roig, F. Castells","doi":"10.1109/CIC.2015.7410959","DOIUrl":"https://doi.org/10.1109/CIC.2015.7410959","url":null,"abstract":"Radiofrequency catheter ablation is currently used widely and successfully to treat atrial fibrillation (AF), whose success is limited in part by uncertainty in the mechanisms that sustain AF. AF intracardiac recordings were registered from the right atrium (RA) and left atrial (LA) in 41 patients immediately before AF ablation procedure. They were divided in 2 groups according to AF recurrence outcome 3 months after ablation procedure: 26 of them remained in sinus rhythm and the other 15 turned back to AF. There was no statistically significant difference between clinical parameters from recurrent and non-recurrent AF patients in both groups. Atrial peaks were detected from the envelope obtained by Teager Energy operator. Results showed differences between maximum of atrial fibrillation cycle length in the RA in both groups, with shorter atrial intervals in the group without recurrences in AF (p=0,03). Moreover, differences between both atria were found in AF non-recurrent patients, higher atrial intervals in the LA (p=0.04), nevertheless not statistical significant differences were found recurrent AF group. High frequency values, especially without a gradient between both atria, predict AF recurrence. It suggests that when the atrial electrical activity is more irregular and similar in both atria, the reversion to sinus rhythm is more difficult.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122058159","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

Endurance exercise improves heart rate complexity in the presence of vagal withdrawal in young adults 耐力运动改善迷走神经戒断的年轻人心率复杂性

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7411088

Steven Perkins, H. Jelinek, B. D. Jong, D. Cornforth, M. Tarvainen, H. Al-Aubaidy

{"title":"Endurance exercise improves heart rate complexity in the presence of vagal withdrawal in young adults","authors":"Steven Perkins, H. Jelinek, B. D. Jong, D. Cornforth, M. Tarvainen, H. Al-Aubaidy","doi":"10.1109/CIC.2015.7411088","DOIUrl":"https://doi.org/10.1109/CIC.2015.7411088","url":null,"abstract":"Sudden cardiac death (SCD) has been reported during and following physical activity. SCD may be due to vagal withdrawal and/or sympathetic dominance associated with the exercise occurring at any time during, immediately following, or up to several days after exercise. Heart rate variability (HRV) describes the influence of the autonomic nervous system on heart rate. We assessed the immediate post-exercise influence of endurance training on HRV in young adults in the morning and also on the same day in the afternoon following the morning exercise session. Linear domain parameter root mean square of successive RR interval differences (RMSSD) showed vagal withdrawal when analysed both immediately after the AM session and also when pre exercise HRV was compared to post exercise HRV during the afternoon (median average change 6.6%). However multiscale Rényi entropy indicated either no change immediately following the exercise for all scaling factors or an increase in HRV complexity of the heart rate. Despite decreased vagal influence, endurance training may be protective for some individuals that retain a higher heart rate complexity as measured by Rényi entropy in the presence of vagal withdrawal.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129732735","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

False alarms in intensive care unit monitors: Detection of life-threatening arrhythmias using elementary algebra, descriptive statistics and fuzzy logic 重症监护病房监测器的误报:使用初等代数、描述性统计和模糊逻辑检测危及生命的心律失常

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408641

F. Plesinger, P. Klimeš, J. Halámek, P. Jurák

{"title":"False alarms in intensive care unit monitors: Detection of life-threatening arrhythmias using elementary algebra, descriptive statistics and fuzzy logic","authors":"F. Plesinger, P. Klimeš, J. Halámek, P. Jurák","doi":"10.1109/CIC.2015.7408641","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408641","url":null,"abstract":"Aims: A false alarm ratio of up to 86 % has been reported in Intensive Care Unit (ICU) monitors. Such a high value can lead to reduced staff attention and patient deprivation. We present a methodfor detection of specific arrhythmias - asystole, extreme bradycardia, extreme tachycardia, ventricular tachycardia and ventricular flutter I fibrillation - in accordance with the \"2015 PhysionetlCinC Challenge\". Data: The method was trained with the use of 750 records and tested on 500 records from ICUs provided by Physionet. Method: Invalid data segments are detected in each of the channels. Next, QRS complexes and RR intervals are found in all signals using a different QRS detection approach according to the signal source. The RR series obtained are tested for regular heart activity; if this fails, an arrhythmia-specific test is processed. Tests for individual arrhythmias are based on examination of QRS temporal distribution, comparison of heart rate (HR) with known limits, and observation of low-frequency ECG activities. Results: Training-set sensitivity and specificity of 96 % and 89 % were achieved. A hidden test set resulted in a score of 81.39 (real-time event) and 84.96 (retrospective event).","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"4629 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124759332","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: 37

Robust detection of ECG waves 心电波的鲁棒检测

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7410974

A. Wojdel, V. Ribas, M. Teixidó-Román, Pablo Ramos, J. Brugada

引用次数: 0

Real-time detection of sleep breathing disorders 实时检测睡眠呼吸障碍

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408650

D. Feuerstein, L. Graindorge, Amel Amblard, Aziz Tatar, Gustavo Guerrero, Sylvain Christofle-Boulard, C. Loiodice, Alfredo Hernandes, J. Pépin

引用次数: 5

Improved detection of activation timings in endoatrial electrograms through a modified sinusoidal recomposition method 通过改进的正弦重构方法改进心房电图激活时间的检测

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7411058

M. Valinoti, G. Lozupone, P. Sabbatani, Roberto Mantovan, S. Severi, C. Corsi

引用次数: 1

Training-induced gene expression plasticity in cardiac function and neural regulation for ultra-trail runners 训练诱导的基因表达可塑性在超越野跑者心功能和神经调节中的作用

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408671

M. Maqueda, E. Roca, D. Brotons, J. Soria, A. Perera-Lluna

{"title":"Training-induced gene expression plasticity in cardiac function and neural regulation for ultra-trail runners","authors":"M. Maqueda, E. Roca, D. Brotons, J. Soria, A. Perera-Lluna","doi":"10.1109/CIC.2015.7408671","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408671","url":null,"abstract":"This study aims to assess the gene regulatory response from a group of 16 athletes and to observe the plasticity induced by their training regime on the gene expression response after their participation in an 82km race. Blood samples for differential gene expression (DGE) were collected before and after this effort from two groups of runners with different training regimes: elite and active. Analyses only focused on genes annotated as related to cardiac function (CF) and neural regulation (NR) from the KEGG PATHWAY Database. Thus, 13 pathways were considered accounting for a total of 629 genes. Training regime modulated the response to exercise based on a list of 18 ranked genes with significant DGE for elite runners while remained statistically insignificant for active athletes. UQCR11, COX7C and COX4I1 genes, related to mitochondrial respiratory chain, were down-regulated which may indicate mitochondrial function impairment in cardiac muscle. Increased expression levels were obtained for PIK3R2, PLCG2, IRAK3 genes from the positive signaling cascades of neurotrophins pathway, which may reveal an improved heart rate control thanks to a better cardiac sympathetic innervation.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123818346","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