Related Experiment Video
Updated: Aug 26, 2026

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
Published on: July 20, 2022
[Circadian pattern features of paroxysmal atrial fibrillation in elderly patients with ischemic heart disease]
Abstract:
Forty-eight elderly patients with IHD and paroxysmal atrial fibrillation were studied to determine circadian pattern of arrhythmia onset. The data were obtained by detailed interview and analysis of medical documents. The found variations were fitted to cosinusoidal function with a period of 24 hours Y = 9.75 + 3.5cos(2 pi t/24 + 0.2) (R2 = 0.69; F = 10.2; P < 0.01; two first coefficients of equation are significant by t-test, P < 0.01), the peak of arrhythmia onset was observed about midnight. 59.8% of overall number of episodes developed at dark period of day (P < 0.05). Findings testify that time periods of arrhythmia onset increase in number with disease evolution. It may be an additional criterion of paroxysmal atrial fibrillation transformation into its permanent form.
Related Concept Videos
Dysrhythmias III: Characteristics of Dysrhythmias
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Disturbances in Heart Rhythm
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
Dysrhythmias VI: Management of Dysrhythmias

