Abstract Stroke prevention is one of the cornerstones of management in patients with atrial fibrillation (AF). As part of the ABC (Atrial fibrillation Better Care) pathway (A: Avoid stroke/Anticoagulation; B: Better symptom control; C: Cardiovascular risk and comorbidity optimisation), stroke risk assessment and appropriate thromboprophylaxis is emphasised. Various guidelines have addressed stroke prevention. In this review, we compared the 2017 APHRS, 2018 ACCP, 2019 ACC/AHA/HRS, and 2020 ESC AF guidelines regarding the stroke/bleeding risk assessment and recommendations about the use of OAC. We also aimed to highlight some unique points for each of those guidelines. All four guidelines recommend the use of the CHA2DS2-VASc score for stroke risk assessment, and OAC (preferably NOACs in all NOAC-eligible patients) is recommended for AF patients with a CHA2DS2-VASc score ≥2 (males) or ≥3 (females). Guidelines also emphasize the importance of stroke risk reassessments at periodic intervals (e.g. 4–6 months) to inform treatment decisions (e.g. initiation of OAC in patients no longer at low risk of stroke) and address potentially modifiable bleeding risk factors.
Background Amiodarone is commonly used during therapeutic hypothermia (TH) following cardiac arrest due to ventricular arrhythmias. However, electrophysiological changes and proarrhythmic risk after amiodarone treatment have not yet been explored in TH. Methods Epicardial high-density bi-ventricular mapping was performed in pigs under baseline temperature (BT), TH (32–34°C), and amiodarone treatment during TH. The total activation time (TAT), conduction velocity (CV), local electrogram (LE) duration, and wavefront propagation from pre-specified segments were analyzed during sinus rhythm (SR) or right ventricular (RV) pacing (RVP), along with tissue expression of connexin 43. The vulnerability to ventricular arrhythmias was assessed. Results Compared to BT, TH increased the global TAT, decreased the CV, and generated heterogeneous electrical substrate during SR and RVP. During TH, the CV reduction and LE duration prolongation were greater in the anterior mid RV than in the other areas, which changed the wavefront propagation in all animals. Compared to TH alone, amiodarone treatment during TH further increased the TAT and LE duration and decreased the CV. Heterogeneous conduction was partially attenuated after amiodarone treatment. After TH and amiodarone treatment, the connexin 43 expression in the anterior mid RV was lower than that in the other areas, compatible with the heterogeneous CV reduction. The animals under TH and amiodarone treatment had a higher incidence of inducible ventricular arrhythmias than those under BT or TH without amiodarone. Conclusion Electrical heterogeneity during amiodarone treatment and TH was associated with vulnerability to ventricular arrhythmias.
Introduction Signal-averaged electrocardiography (SAECG) provides diagnostic and prognostic information regarding cardiac diseases. However, its value in other nonischemic cardiomyopathies (NICMs) remains unclear. This study aimed to investigate the role of SAECG in patients with NICM. Methods and results This retrospective study included consecutive patients with NICM who underwent SAECG, biventricular substrate mapping, and ablation for ventricular arrhythmia (VA). Patients with baseline ventricular conduction disturbances were excluded. Patients who fulfilled at least one SAECG criterion were categorized into Group 1, and the other patients were categorized into Group 2. Baseline and ventricular substrate characteristics were compared between the two groups. The study included 58 patients (39 men, mean age 50.4 ± 15.5 years), with 34 and 24 patients in Groups 1 and 2, respectively. Epicardial mapping was performed in eight (23.5%) and six patients (25.0%) in Groups 1 and 2 ( p = 0.897), respectively. Patients in Group 1 had a more extensive right ventricular (RV) low-voltage zone (LVZ) and scar area than those in Group 2. Group 1 had a larger epicardial LVZ than Group 2. Epicardial late potentials were more frequent in Group 1 than in Group 2. There were more arrhythmogenic foci within the RV outflow tract in Group 1 than in Group 2. There was no significant difference in long-term VA recurrence. Conclusion In our NICM population, a positive SAECG was associated with a larger RV endocardial scar, epicardial scar/late potentials, and a higher incidence of arrhythmogenic foci in the RV outflow tract.
Abstract Background New-onset atrial fibrillation (AF) is common and antiarrhythmic drugs (AADs) are commonly used for treating such patients. However, whether there are temporal changes and regional differences in the choice of AADs in direct acting non-vitamin K oral anticoagulants (DOACs) era is less studied. Purpose The present study aimed to analyze the temporal trends and regional differences of initial oral AAD options in patients with new-onset AF in the GLORIA-AF registry, based on a proposed modernized classification of AADs in 2018 (Circulation, 2018, PMID: 30354657). AADs involved in the present study included traditional Vaughn-Williams Class I to Class IV AAD, Class IId AAD (digoxin), and Class VII AAD, which acts on the upstream of arrhythmia including angiotensin converting enzyme inhibition, angiotensin receptor blocker, and stains. Methods Temporal changes regarding the AAD use between the two phases of GLORIA-AF and regional differences of AADs choice were investigated. Factors associated with the choice of different AADs were established by multivariate logistic regression. Results Among the 36,617 participants in the GLORIA-AF registry, 33,208 (90.7%) were prescribed with AADs: 74.0% were rate control and 10.2% were rhythm control, and among the prescribed AADs, single and dual AADs were used in 73.3% and 24.9%, respectively. Moreover, 70.5% patients received upstream target modulators (Class VII AAD). Class IIa AADs (beta-blockers) were the most commonly prescribed AAD and slightly increased from Phase II (60.58%) to Phase III (62.91%) while the use of Class IId AAD (e.g. digoxin) decreased regardless of single or combined use. AADs use varied significantly among regions but the temporal trends and regional differences were similar with that of the overall cohort. Age, gender, comorbidities, admission signs, region, and concomitant medications (e.g. anticoagulants) were associated with the choices of different AADs. Conclusions In the DOAC era, new-onset AF patients receiving AAD commonly included upstream therapy. Rate control was still the dominant strategy for patients with new-onset AF but the use of Class IId AAD significantly decreased with the increased use of Class IIa AAD. The choice of AADs demonstrated significant regional differences and concomitant anticoagulants played important roles.Temporal trends in GLORIA-AFComparisons of AADs use in GLORIA-AF
Abstract Aims Cardiac implanted electronic devices (CIEDs) can detect atrial high‐rate episodes (AHREs) and challenge current management of subclinical atrial fibrillation (AF). Methods To characterize the anatomic and functional remodeling of cardiac structures between patients with subclinical AF (SCAF) and clinical AF. The predictors for AHREs ≥6 min were also investigated. Results We compared the atrial volume, dynamic function, and peri‐atrial fat between 104 CIEDs (AHREs = 0, n = 12; SCAF, n = 66; CIEDs with AF, n = 26) and 40 paroxysmal AF patients who were planning for catheter ablation (AF for ablation) using 256‐slice multidetector computed tomography for the duration of the AHREs. The maximal volume of the left atrium (LA) and LA appendage (LAA) were significantly smaller; the total emptying fraction (EF) and active EF of the LA and LAA were significantly better in the patients with SCAF than in those with clinical AF. Less peri‐atrial fat ( p < 0.001) and a greater LAA/ascending aorta (AA) Hounsfield unit (HU) ratio ( p < 0.05) were noted in the patients with SCAF. Significantly increased volume reduced the total EF of LA and LAA and a reduced LAA/AA HU ratio (0.91 ± 0.18 vs 0.98 ± 0.03 vs 0.97 ± 0.05, p < 0.05) were demonstrated in patients with AHREs ≥6 min compared to those with AHREs <6 min and without AHRE. Multivariate analysis showed the reduced LAA/AA HU ratio is an independent predictor for the development of AHREs ≥6 min. Conclusion As compared to clinical AF, patients with SCAF show a more favorable LA remodeling process. Among the patients with device‐detected AHREs, worse LA remodeling and a reduced LAA/AA HU ratio were associated with the occurrence of AHREs ≥6 min. These findings may provide an incremental value for understanding SCAF.
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