The Experts below are selected from a list of 1440 Experts worldwide ranked by ideXlab platform

Berat Dogan - One of the best experts on this subject based on the ideXlab platform.

  • ecg Beat classification using particle swarm optimization and radial basis function neural network
    Expert Systems With Applications, 2010
    Co-Authors: Mehmet Korurek, Berat Dogan
    Abstract:

    This paper presents a method for electrocardiogram (ECG) Beat classification based on particle swarm optimization (PSO) and radial basis function neural network (RBFNN). Six types of Beats including Normal Beat, Premature Ventricular Contraction (PVC), Fusion of Ventricular and Normal Beat (F), Atrial Premature Beat (A), Right Bundle Branch Block Beat (R) and Fusion of Paced and Normal Beat (f) are obtained from the MIT-BIH arrhythmia database. Four morphological features are extracted from each Beat after the preprocessing of the selected records. For classification stage of the extracted features, a RBFNN structure which is evolved by particle swarm optimization is used. Several experiments are performed over the test set and it is observed that the proposed method classifies ECG Beats with a smaller size of network without making any concessions on the classification performance.

  • ecg Beat classification using particle swarm optimization and radial basis function neural network
    Expert Systems With Applications, 2010
    Co-Authors: Mehmet Korurek, Berat Dogan
    Abstract:

    This paper presents a method for electrocardiogram (ECG) Beat classification based on particle swarm optimization (PSO) and radial basis function neural network (RBFNN). Six types of Beats including Normal Beat, Premature Ventricular Contraction (PVC), Fusion of Ventricular and Normal Beat (F), Atrial Premature Beat (A), Right Bundle Branch Block Beat (R) and Fusion of Paced and Normal Beat (f) are obtained from the MIT-BIH arrhythmia database. Four morphological features are extracted from each Beat after the preprocessing of the selected records. For classification stage of the extracted features, a RBFNN structure which is evolved by particle swarm optimization is used. Several experiments are performed over the test set and it is observed that the proposed method classifies ECG Beats with a smaller size of network without making any concessions on the classification performance.

Jianfang Xue - One of the best experts on this subject based on the ideXlab platform.

  • the effect of early and intensive statin therapy on ventricular Premature Beat or nonsustained ventricular tachycardia in patients with acute coronary syndrome
    Clinical Cardiology, 2011
    Co-Authors: Shenghua Zhou, Xinhong Wan, Haiyu Wang, Qinghua Zhong, Jianfang Xue
    Abstract:

    Retraction The following article from Clinical Cardiology, “The Effect of Early and Intensive Statin Therapy on Ventricular Premature Beat or Nonsustained Ventricular Tachycardia in Patients With Acute Coronary Syndrome,”1 by Xian-Zhi He, MD; Sheng-Hua Zhou, MD; Xin-Hong Wan, MD; Hai-Yu Wang, MD; Qing-Hua Zhong, MD; and Jian-Fang Xue, MD, published online on December 10, 2010 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the journal Editor-in-Chief, Dr. A.J. Camm, and Wiley Periodicals, Inc. The retraction has been agreed due to significant overlap with a similar article2 previously published by the same authors in the Cardiology Journal. References 1. He X.-Z., Zhou S.-H., Wan X.-H., Wang H.-Y., Zhong Q.-H. and Xue J.-F. The effect of early and intensive statin therapy on ventricular Premature Beat or nonsustained ventricular tachycardia in patients with acute coronary syndrome. Clin Cardiol. 34(1):59–63. doi: 10.1002/clc.20818 2. He XZ, Zhou SH, Wan XH, Wang HY, Zhong QH, Xue JF. The effect of early and intensive statin therapy on ventricular Premature Beat or non-sustained ventricular tachycardia in patients with acute coronary syndrome. Cardiol J. 2010;17(4):381–385. The authors have no funding, financial relationships, or conflicts of interest to disclose.

  • the effect of early and intensive statin therapy on ventricular Premature Beat or non sustained ventricular tachycardia in patients with acute coronary syndrome
    Cardiology Journal, 2010
    Co-Authors: Shenghua Zhou, Xinhong Wan, Haiyu Wang, Qinghua Zhong, Jianfang Xue
    Abstract:

    Background: Our study’s aim was to evaluate the prognostic value of early and intensive lipid-lowering treatment on ventricular Premature Beat or non-sustained ventricular tachycardia (NSVT) after acute coronary syndrome (STEMI, non-STEMI, and unstable angina pectoris). Methods: Some 586 patients with acute coronary syndrome were randomly divided into two groups: Group A (with conventional statin therapy, to receive 10 mg/day atorvastatin, n = 289) and Group B (given early and intensive statin therapy, 60 mg immediately and 40 mg/day atorvastatin, n = 297). The frequency of ventricular Premature Beat and NSVT was recorded via Holter monitoring after hospitalization (24 h and 72 h). Results: Seventy seven (11.8%) patients had NSVT. When compared to patients with no documented NSVT, patients with NSVT were older and more frequently had myocardial infarction in their history, diabetes mellitus, atrial fibrillation and an ejection fraction Conclusions: Early and intensive lipid-lowering treatment can clearly decrease ventricular Premature Beats and NSVT. (Cardiol J 2010; 17, 4: 381-385)

Mehmet Korurek - One of the best experts on this subject based on the ideXlab platform.

  • ecg Beat classification using particle swarm optimization and radial basis function neural network
    Expert Systems With Applications, 2010
    Co-Authors: Mehmet Korurek, Berat Dogan
    Abstract:

    This paper presents a method for electrocardiogram (ECG) Beat classification based on particle swarm optimization (PSO) and radial basis function neural network (RBFNN). Six types of Beats including Normal Beat, Premature Ventricular Contraction (PVC), Fusion of Ventricular and Normal Beat (F), Atrial Premature Beat (A), Right Bundle Branch Block Beat (R) and Fusion of Paced and Normal Beat (f) are obtained from the MIT-BIH arrhythmia database. Four morphological features are extracted from each Beat after the preprocessing of the selected records. For classification stage of the extracted features, a RBFNN structure which is evolved by particle swarm optimization is used. Several experiments are performed over the test set and it is observed that the proposed method classifies ECG Beats with a smaller size of network without making any concessions on the classification performance.

  • ecg Beat classification using particle swarm optimization and radial basis function neural network
    Expert Systems With Applications, 2010
    Co-Authors: Mehmet Korurek, Berat Dogan
    Abstract:

    This paper presents a method for electrocardiogram (ECG) Beat classification based on particle swarm optimization (PSO) and radial basis function neural network (RBFNN). Six types of Beats including Normal Beat, Premature Ventricular Contraction (PVC), Fusion of Ventricular and Normal Beat (F), Atrial Premature Beat (A), Right Bundle Branch Block Beat (R) and Fusion of Paced and Normal Beat (f) are obtained from the MIT-BIH arrhythmia database. Four morphological features are extracted from each Beat after the preprocessing of the selected records. For classification stage of the extracted features, a RBFNN structure which is evolved by particle swarm optimization is used. Several experiments are performed over the test set and it is observed that the proposed method classifies ECG Beats with a smaller size of network without making any concessions on the classification performance.

Shenghua Zhou - One of the best experts on this subject based on the ideXlab platform.

  • the effect of early and intensive statin therapy on ventricular Premature Beat or nonsustained ventricular tachycardia in patients with acute coronary syndrome
    Clinical Cardiology, 2011
    Co-Authors: Shenghua Zhou, Xinhong Wan, Haiyu Wang, Qinghua Zhong, Jianfang Xue
    Abstract:

    Retraction The following article from Clinical Cardiology, “The Effect of Early and Intensive Statin Therapy on Ventricular Premature Beat or Nonsustained Ventricular Tachycardia in Patients With Acute Coronary Syndrome,”1 by Xian-Zhi He, MD; Sheng-Hua Zhou, MD; Xin-Hong Wan, MD; Hai-Yu Wang, MD; Qing-Hua Zhong, MD; and Jian-Fang Xue, MD, published online on December 10, 2010 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the journal Editor-in-Chief, Dr. A.J. Camm, and Wiley Periodicals, Inc. The retraction has been agreed due to significant overlap with a similar article2 previously published by the same authors in the Cardiology Journal. References 1. He X.-Z., Zhou S.-H., Wan X.-H., Wang H.-Y., Zhong Q.-H. and Xue J.-F. The effect of early and intensive statin therapy on ventricular Premature Beat or nonsustained ventricular tachycardia in patients with acute coronary syndrome. Clin Cardiol. 34(1):59–63. doi: 10.1002/clc.20818 2. He XZ, Zhou SH, Wan XH, Wang HY, Zhong QH, Xue JF. The effect of early and intensive statin therapy on ventricular Premature Beat or non-sustained ventricular tachycardia in patients with acute coronary syndrome. Cardiol J. 2010;17(4):381–385. The authors have no funding, financial relationships, or conflicts of interest to disclose.

  • the effect of early and intensive statin therapy on ventricular Premature Beat or non sustained ventricular tachycardia in patients with acute coronary syndrome
    Cardiology Journal, 2010
    Co-Authors: Shenghua Zhou, Xinhong Wan, Haiyu Wang, Qinghua Zhong, Jianfang Xue
    Abstract:

    Background: Our study’s aim was to evaluate the prognostic value of early and intensive lipid-lowering treatment on ventricular Premature Beat or non-sustained ventricular tachycardia (NSVT) after acute coronary syndrome (STEMI, non-STEMI, and unstable angina pectoris). Methods: Some 586 patients with acute coronary syndrome were randomly divided into two groups: Group A (with conventional statin therapy, to receive 10 mg/day atorvastatin, n = 289) and Group B (given early and intensive statin therapy, 60 mg immediately and 40 mg/day atorvastatin, n = 297). The frequency of ventricular Premature Beat and NSVT was recorded via Holter monitoring after hospitalization (24 h and 72 h). Results: Seventy seven (11.8%) patients had NSVT. When compared to patients with no documented NSVT, patients with NSVT were older and more frequently had myocardial infarction in their history, diabetes mellitus, atrial fibrillation and an ejection fraction Conclusions: Early and intensive lipid-lowering treatment can clearly decrease ventricular Premature Beats and NSVT. (Cardiol J 2010; 17, 4: 381-385)

Marek Malik - One of the best experts on this subject based on the ideXlab platform.

  • heart rate turbulence after atrial and ventricular Premature Beats relation to left ventricular function and coupling intervals
    Pacing and Clinical Electrophysiology, 2003
    Co-Authors: Irina Savelieva, Dan Wichterle, Maggie Meara, Monica Harries, John A Camm, Marek Malik
    Abstract:

    SAVELIEVA, I., et al.: Heart Rate Turbulence After Atrial and Ventricular Premature Beats: Relation to Left Ventricular Function and Coupling Intervals.Heart rate turbulence (HRT) represents a biphasic chronotropic response of the sinus node to a single ventricular Premature Beat (VPB). Objectives: To determine whether HRT is present after an atrial Premature Beat (APB) and to investigate the effects of paced VPB and APB coupling intervals on HRT quantifiers in patients with and without left ventricular dysfunction. Methods: A total of 37 subjects (54 ± 16years, 32 men) referred for electrophysiologic evaluation for ventricular tachycardia underwent a stimulation protocol consisting of 3 series of single atrial and ventricular extrastimuli with coupling intervals decremented from 750 to 400 ms at a 50 ms-step. Turbulence onset (TO) and turbulence slope (TS) after an APB and a VPB were calculated separately using a dedicated computer algorithm. Results: After an APB, TS was significantly attenuated (3.95 ± 0.99vs8.32 ± 1.9 ms/RR, P < 0.008) and TO was positive (1.37 ± 0.35%vs-2.03 ± 0.42%, P < 0.001) compared with those after a VPB. There was a strong correlation between TS(r = 0.71, P = 0.0002)but not between TO(r = 0.07, P = 0.074)after an APB and a VPB. In subjects with normal ejection fraction, the prematurity of ventricular coupling intervals was strongly related to TO(r = 0.68)and TS(r =−0.61), P < 0.0001for both. These effects were less pronounced in patients with left ventricular dysfunction (TO:r = 0.25, P < 0.01; TS:r =−0.07, P = ns). No correlation was found between the APB coupling interval and TS or TO in both groups. Conclusions: An APB induces HRT but the response is substantially attenuated and is not influenced by the APB coupling interval. In contrast to a VPB, TO is positive after an APB. Lack of correlation between HRT after a VPB and the VBP coupling interval indicates blunted baroreflex response in patients with left ventricular dysfunction. (PACE 2003; 26[Pt. II]:401–405)

  • mechanisms involved in heart rate turbulence
    Cardiac Electrophysiology Review, 2002
    Co-Authors: Dan Wichterle, Vojtech Melenovsky, Marek Malik
    Abstract:

    Proper understanding of the mechanisms involved in heart rate turbulence (HRT) may offer anexplanation of why it is such a potent postinfarction risk stratifier. This article reviews the physiologicalbackground of ventriculophasic sinus arrhythmia—a phenomenon which shares some underlying physiologicalfeatures with HRT including cardiac autonomic regulation. It is now believed that HRT is principally triggeredby a transient loss of vagal efferent activity in response to the missed baroreflex afferent input due toventricular Premature Beat-induced haemodynamically inefficient ventricular contraction. Studies are summarizedwhich support more or less directly this hypothesis. The physiology of early acceleration and late decelerationof heart rate after a ventricular Premature Beat is discussed. Qualitatively different but otherwisequantitatively uniform postectopic dynamics of systolic blood pressure after ventricular Premature Beats isdemonstrated in subjects with normal and abnormal left ventricular function. It is concluded that the slope oflate deceleration of heart rate after ventricular Premature Beats can serve as a reasonable surrogate forbaroreflex sensitivity.

  • heart rate turbulence can be detected after atrial Premature Beat
    Journal of the American College of Cardiology, 2002
    Co-Authors: Irina Savelieva, Dan Wichterle, Azad Ghuran, Maggie Meara, John Camm, Marek Malik
    Abstract:

    Heart rate turbulence (HRT) describes a bi-phasic chronotropic response of sinus rhythm to a ventricular Premature Beat (VPB). The aim of the study was to investigate whether an atrial Premature Beat (APB) can produce HRT and whether it can be described using ventricular HRT quantifiers (turbulence onset, TO, and turbulence slope, TS). Methods: Thirty-seven subjects (54±16 years) referred for electrophysiologic evaluation for ventricular tachyarrhythmias underwent a stimulation protocol consisting of 3 series of single atrial and ventricular extrastimuli delivered from the high right atrium and right ventricular apex prior to programmed electrical stimulation. Atrial and ventricular TO and TS (ATO, ATS, VTO, VTS) were calculated separately using a dedicated computer algorithm. Results: Expressed as mean±SD, VTO -2.03±0.42%, ATO 1.37±0.35% (p <0.001); VTS 8.32±1.9 ms/RR, ATS 3.95±0.99 ms/RR (p <0.008). There was a strong correlation between VTS and ATS (r=0.71, p=0.0002; Figure, right) but not between VTO and ATO (r=0.83, p=0,074; left). Conclusions: HRT phenomenon is present after an APB, suggesting that similar baroreceptor mechanisms operate following both VPB and APB. After an APB, the late phase response (rhythm deceleration) is significantly attenuated and the early phase response is different than that after a VPB, indicating the presence of alternative mechanisms. Atrial HRT can be measured using existing technique but algorithm adjustments are desirable. ACC 2002 / 51st Annual Scientific Session March 17-20, 2002, Atlanta, Georgia, USA Page 1