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Theoretical and Practical Aspects of the Nonlinear Dynamics' Methods of Heart Rate Variability Analyses in Tachyarrhythmia Patients Underwent Radiofrequency Catheter Ablation.
Cardiovasc Eng Technol
January 2025
Department of Biomedical Engineering, Northwestern University, Chicago, IL, USA.
Purpose: This study explores the use of heart rate variability (HRV) analysis, a noninvasive technique for assessing the autonomic nervous system, by applying nonlinear dynamics and chaos theory to detect chaotic behavior in RR intervals and assess cardiovascular health.
Methods: Employing the "System Analysis of Heart Rate Dynamics" (SADR) program, this research combines chaos analysis with the short-time Fourier transform to assess nonlinear dynamic parameters in HRV. It includes constructing phase portraits in Takens space and calculating measures of chaos to identify deterministic chaos indicators.
Proactive esophageal cooling during radiofrequency cardiac ablation: data update including applications in very high-power short duration ablation.
Expert Rev Med Devices
January 2025
Cardiac Electrophysiology, NorthShore University Health System, Evanston, IL, USA.
Introduction: Proactive esophageal cooling reduces injury during radiofrequency (RF) ablation of the left atrium (LA) for the treatment of atrial fibrillation (AF). New catheters are capable of higher wattage settings up to 90 W (very high-power short duration, vHPSD) for 4 s. Varying power and duration, however, does not eliminate the risk of thermal injury.
View Article and Find Full Text PDF3D mapping quest: How far can we see with recent advances in 3D mapping?
J Cardiol
December 2024
Division of Cardiology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan. Electronic address:
Recent advances in three-dimensional (3D) ultra-high-density mapping systems have uncovered previously unknown mechanisms underlying various arrhythmias. This clinical review, titled "3D Mapping Quest," focuses on the recently uncovered mechanisms of four types of arrhythmias. (1) To elucidate the precise mechanisms underlying atrial fibrillation (AF), ultra-high-density mapping with adequate spatial and temporal resolution is essential.
View Article and Find Full Text PDFA single-center trial of electrographic flow mapping and concomitant voltage mapping in sinus rhythm and atrial fibrillation (FLOW EVAL-AF).
J Interv Card Electrophysiol
November 2024
Cortex Inc, Menlo Park, CA, USA.
Article Synopsis
- Electrographic flow (EGF) mapping is a technique used to understand how electrical signals move in the heart's atria, especially in relation to atrial fibrillation (AF) compared to normal sinus rhythm (SR).
- The study involved mapping electrical activity in the atria of ten patients, showing that EGF patterns differ significantly in AF, with lower electrographic flow consistency (EGFC) during AF compared to SR, indicating more chaotic activity.
- The findings suggest EGFC could serve as a valuable marker for assessing atrial health and myopathy, correlating with bipolar voltage measurements, which are commonly used to evaluate heart conditions.
Atrial Fibrillation and Underlying Structural and Electrophysiological Heterogeneity.
Int J Mol Sci
September 2024
Department of Cardiovascular Medicine, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.
As atrial fibrillation (AF) progresses from initial paroxysmal episodes to the persistent phase, maintaining sinus rhythm for an extended period through pharmacotherapy and catheter ablation becomes difficult. A major cause of the deteriorated treatment outcome is the atrial structural and electrophysiological heterogeneity, which AF itself can exacerbate. This heterogeneity exists or manifests in various dimensions, including anatomically segmental structural features, the distribution of histological fibrosis and the autonomic nervous system, sarcolemmal ion channels, and electrophysiological properties.
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