Background: Low-energy anti-fibrillation pacing (LEAP) has been suggested as an alternative treatment in symptomatic fibrillation patients. It significantly lowers the energy required compared with standard 1-shock defibrillation.
Objective: In this study, we investigated the mechanism of arrhythmia termination by LEAP and systematically analyzed the influence of shock period and timing on the success rate of LEAP.
Methods: We induced atrial and ventricular fibrillation in isolated canine hearts and applied LEAP and standard 1-shock defibrillation to terminate the arrhythmia. We simulated the arrhythmia and LEAP using a 2-dimensional bidomain human atrial model.
Results: The ex vivo experiments showed successful termination of atrial fibrillation and ventricular fibrillation using LEAP, with an average 88% and 81% energy reduction, respectively, and both experiments and simulations verified that synchronization from virtual electrodes is the key mechanism for termination of arrhythmia by LEAP using modified Kuramoto phase plots and fraction of tissue excited (FTE) plots. We also observed in simulations that LEAP is more effective when the shock period is close to the dominant period and the first shock is delivered when FTE is decreasing.
Conclusions: Our results support synchronization as the mechanism for arrhythmia termination by LEAP, and its effectiveness can be improved by adjusting shock period and timing.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.hrthm.2017.05.021 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Analysis of clinical features and prognosis in cardiac amyloidosis patients from Spanish hospitals (2016-2021).
Rev Clin Esp (Barc)
January 2025
Institute for the Improvement of Health Care (IMAS Foundation), Madrid, Spain.
Introduction And Objectives: Cardiac amyloidosis (CA) is a prevalent yet underdiagnosed heart condition characterized by the abnormal accumulation of amyloid fibres, frequently resulting in heart failure (HF), particularly in older people. Despite advancements in non-invasive diagnostic techniques and treatments, the epidemiology of CA patients remains inadequately understood. This nationwide retrospective observational study sought to comprehensively investigate CA patients' characteristics, mortality, and readmission patterns.
View Article and Find Full Text PDFPregnancy and COVID-19: Comparing ICU Outcomes for Pregnant and Nonpregnant Women.
Viruses
December 2024
Clinical Department of Anesthesiology and Intensive Therapy, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland.
Background: This study compares organ dysfunction, treatment strategies, and unfavorable outcome rates between pregnant and nonpregnant women admitted to the ICU with severe COVID-19, highlighting the increased susceptibility of pregnant women to respiratory infections due to physiological changes.
Methods: A retrospective, age-matched study was conducted at a referral center specializing in critical care for pregnant women. Data from 14 pregnant/postpartum and 11 nonpregnant women were analyzed at ICU admission and on days 3, 5, and 7.
Predictors and Impact of Cardiogenic Shock in Oldest-Old ST-Elevation Myocardial Infarction Patients.
J Clin Med
January 2025
Department of Cardiology, San Maurizio Hospital, 39100 Bolzano, Italy.
: Cardiogenic shock (CS) is the most frequent cause of in-hospital mortality after ST-elevation myocardial infarction (STEMI). Data about CS in very elderly (age ≥ 85 years) STEMI patients are scarce. We sought to assess the prognostic factors and the short- and mid-term impact of CS in this population.
View Article and Find Full Text PDFDifferences in Characteristics of Peripartum Patients Who Did and Did Not Require an Upgrade to the Intensive Care Unit: A Propensity Score Matching Study.
Medicina (Kaunas)
January 2025
Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
This study sought to identify predictors for peripartum patients admitted to non-intensive care wards who later upgraded to the Intensive Care Unit (ICU). This was a retrospective observational study of patients admitted to the Maternal Fetal Ward between 01/2017 and 12/2022, who later upgraded to the ICU. Upgraded patients were 1:1 propensity score matched with those who remained on the Maternal Fetal Ward (control).
View Article and Find Full Text PDFIncreased use of damage control laparotomy for emergency small bowel or colon surgery: does it affect patient outcomes?
Eur J Trauma Emerg Surg
January 2025
Division of Acute Care Surgery, Department of Surgery, University of Iowa, Iowa City, IA, USA.
Purpose: Evidence to guide the application of damage control laparotomy (DCL) in emergency surgery patients is limited. We assessed whether DCL use for emergent small bowel or colon surgery increased over time and its impact on outcomes. We hypothesized that DCL would be utilized more often in patients with significant comorbidities or septic shock with improved outcomes.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!