Frequency profile generated from left atrial activation in patients with paroxysmal atrial fibrillation

2007 ◽  
Vol 40 (4) ◽  
pp. S48
Author(s):  
Keisuke Kawachi ◽  
Takeshi Tsutsumi ◽  
Daisuke Wakatsuki ◽  
Kei Ota ◽  
Nami Kubota ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Paroxysmal Atrial Fibrillation ◽  
Left Atrial ◽  
Frequency Profile ◽  
Atrial Activation

scholarly journals Altered left atrial 4D flow characteristics in patients with paroxysmal atrial fibrillation in the absence of apparent remodeling

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmet Demirkiran ◽  
Raquel P. Amier ◽  
Mark B. M. Hofman ◽  
Rob J. van der Geest ◽  
Lourens F. H. J. Robbers ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Sinus Rhythm ◽  
Flow Velocity ◽  
Paroxysmal Atrial Fibrillation ◽  
Left Atrial ◽  
Peak Flow ◽  
Thrombus Formation ◽  
Clinical Value ◽  
4D Flow ◽  
Ssfp Cine

AbstractThe pathophysiology behind thrombus formation in paroxysmal atrial fibrillation (AF) patients is very complex. This can be due to left atrial (LA) flow changes, remodeling, or both. We investigated differences for cardiovascular magnetic resonance (CMR)-derived LA 4D flow and remodeling characteristics between paroxysmal AF patients and patients without cardiac disease. In this proof-of-concept study, the 4D flow data were acquired in 10 patients with paroxysmal AF (age = 61 ± 8 years) and 5 age/gender matched controls (age = 56 ± 1 years) during sinus rhythm. The following LA and LA appendage flow parameters were obtained: flow velocity (mean, peak), stasis defined as the relative volume with velocities < 10 cm/s, and kinetic energy (KE). Furthermore, LA global strain values were derived from b-SSFP cine images using dedicated CMR feature-tracking software. Even in sinus rhythm, LA mean and peak flow velocities over the entire cardiac cycle were significantly lower in paroxysmal AF patients compared to controls [(13.1 ± 2.4 cm/s vs. 16.7 ± 2.1 cm/s, p = 0.01) and (19.3 ± 4.7 cm/s vs. 26.8 ± 5.5 cm/s, p = 0.02), respectively]. Moreover, paroxysmal AF patients expressed more stasis of blood than controls both in the LA (43.2 ± 10.8% vs. 27.8 ± 7.9%, p = 0.01) and in the LA appendage (73.3 ± 5.7% vs. 52.8 ± 16.2%, p = 0.04). With respect to energetics, paroxysmal AF patients demonstrated lower mean and peak KE values (indexed to maximum LA volume) than controls. No significant differences were observed for LA volume, function, and strain parameters between the groups. Global LA flow dynamics in paroxysmal AF patients appear to be impaired including mean/peak flow velocity, stasis fraction, and KE, partly independent of LA remodeling. This pathophysiological flow pattern may be of clinical value to explain the increased incidence of thromboembolic events in paroxysmal AF patients, in the absence of actual AF or LA remodeling.

Clinical outcome of left atrial ablation for paroxysmal atrial fibrillation is related to the extent of radiofrequency ablation

2008 ◽  
Vol 22 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Demosthenes Katritsis ◽  
Kenneth A. Ellenbogen ◽  
Eleftherios Giazitzoglou ◽  
Dimitrios Sougiannis ◽  
George Paxinos ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Radiofrequency Ablation ◽  
Clinical Outcome ◽  
Paroxysmal Atrial Fibrillation ◽  
Left Atrial ◽  
Atrial Ablation

Hemodynamic impact of percutaneous left atrial appendage closure in patients with paroxysmal atrial fibrillation

2018 ◽  
Vol 53 (2) ◽  
pp. 151-157 ◽  
Author(s):  
Lluis Asmarats ◽  
Mathieu Bernier ◽  
Gilles O’Hara ◽  
Jean-Michel Paradis ◽  
Kim O’Connor ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Paroxysmal Atrial Fibrillation ◽  
Left Atrial ◽  
Left Atrial Appendage ◽  
Atrial Appendage ◽  
Left Atrial Appendage Closure

Abstract 3648: Detection Of Paroxysmal Atrial Fibrillation In Patient With Acute Brain Ischemia Combining Cardiac And Holter Monitoring: Prevalence And Predictors

Stroke ◽  
2012 ◽  
Vol 43 (suppl_1) ◽  
Author(s):  
Patricia Martinez-Sanchez ◽  
Elisa Correas Callero ◽  
Andres Cruz Herranz ◽  
Blanca Fuentes Gimeno ◽  
Angel Martin Montes ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Brain Ischemia ◽  
Paroxysmal Atrial Fibrillation ◽  
Left Atrial ◽  
Duplex Ultrasound ◽  
Unknown Origin ◽  
Holter Monitoring ◽  
Cardiac Monitoring ◽  
Stroke Severity ◽  
Carotid Plaques

INTRODUCTION: The yield of serial electrocardiograms (ECG) plus 72-hour cardiac monitoring and Holter monitoring in detection of paroxysmal atrial fibrillation (PAF) is not well known. METHODS: consecutive patients with stroke or transient ischemic attack (TIA) admitted to a Stroke Unit (SU) during January 2009-June 2010 were studied. Patients underwent serial ECG and cardiac monitoring in the first 72 hours. Furthermore, 24-hours Holter monitoring were performed in patient with brain ischemia of unknown origin or if cardiac embolism was suspected. The presence of atrial fibrillation (AF) and PAF was recorded. RESULTS: 537 patients were included, 59.6% males. Mean age 69.1 (SD 13.5) years. Previous AF was present in 15.8% patients. ECG on admission showed not previously known AF in 22 (4%) patients. Cardiac monitoring and serial ECG in the SU detected PAF in 12 (2.2%) cases more. 24-hours Holter monitoring was completed in 156 patients, in 42 cases PFA was detected, of them 6 had been previously detected by serial ECG/cardiac monitoring. One case of PAF detected by serial ECG was not confirmed by Holter monitoring. In total, 10.8% of patients were diagnosed with new PAF. In multivariate analyses, NIHSS on admission (OR 1.1 for each 1 point increase; 95% CI, 1-1.2), enlarged left atrial (OR 5.8; 95% CI, 2.8-12), absence of carotid plaques by duplex ultrasound (OR 2.1; 95% CI 1-4.4) and hyperlipidemia (OR 2.4; 95% CI 1.119-5) were predictors of PAF. CONCLUSIONS: 24-hours Holter monitoring increased by 6 fold the detection of PAF as compared to ECG plus cardiac monitoring in acute stroke patients. Stroke severity, enlarged left atrial, absence of carotid plaques and hyperlipidemia are associated with PAF.

Prevalence of paroxysmal atrial fibrillation in patients with cerebrovascular stroke of undetermined etiology

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Mohammed Elnwagy ◽  
Hossam Shokery ◽  
Emad Effat ◽  
Hayam El Damnhory
Keyword(s):  
Atrial Fibrillation ◽  
Paroxysmal Atrial Fibrillation ◽  
Left Atrial ◽  
Cryptogenic Stroke ◽  
Holter Monitoring ◽  
Ectopic Beat ◽  
Unknown Etiology ◽  
P Value ◽  
Undetermined Etiology ◽  
Cerebrovascular Stroke

Abstract Background cerebrovascular stroke is major cause of morbidity and disability. Many causes may contribute to its presence, however. Some patients have none of the identified risk factors, yet face the consequences of stroke or transit ischemic attack. This type of stroke known to be stroke of undetermined source or etiology. It has a high rate of recurrence due to the persistence of the unknown etiology. Paroxysmal atrial fibrillation remains the hidden bottom of an iceberg representing a major part of the causes of ischemic cerebrovascular stroke of undetermined etiology . Aim and Objectives: to determine the prevalence of subclinical atrial fibrillation in patients with ischemic cerebrovascular stroke of undetermined etiology in a population in Egypt by 48h holter monitoring. Patients and Methods Patients diagnosed with acute cerebrovascular stroke of undetermined etiology at the neurology department of Ain Shams university hospitals underwent 48 hours holter monitoring within the first week of the insulting event. Results This study included 50 patients with cryptogenic stroke (CS) who underwent 48 hours holter monitoring. The patients' ages ranged between 22 and 77 years old (mean age 48.46 ± 12.74years). This study included 34 males and 16 females. Their body mass index BMI ranges from 21-35 kg/m2, with mean BMI of 24.78 ± 2.99 kg/m2. Their left atrial diameter ranges from 26-47mm, with mean diameter of 36.08 ± 5.23mm .Eight out of fifty patients newly diagnosed with subclinical atrial fibrillation with prevalence of 16%. There was statistically significant association between the atrial fibrillation (AF) and both age (p value, 009) and left atrial (LA) diameter (p value, 001) .There was an associated finding that need further investigation about the significant association between the ventricular ectopic beat VEB burden and the presence of AF or stroke. Conclusion The prevalence of paroxysmal atrial fibrillation among the population of ischemic stroke of undetermined etiology in a population in Egypt is close to worldwide percentage and the recent met analysis studies of 11%.

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