The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Atrial fibrillation (AF) is a common arrhythmia characterized by desynchronization of atrial electrical activity causing a consequent irregular ventricular response. Blood pressure (BP) fluctuates in a complex mode composed of both short-term and long-term variability. In AF, the beat-to-beat variation of BP is increased because of variations in filling time and in contractility. However, a few studies...
In patients with atrial fibrillation (AF), the fibrillatory frequency trend and the time-dependent spectral characteristics can be investigated using a spectral profile technique. The spectral profile is updated by fitting each short-time spectrum. The aim of this study is to develop model-based means for stricter control on the update of the spectral profile. A spectral model defined by a superposition...
Atrial fibrillation (AF) is an arrhythmia characterized by highly irregular atrial depolarization. Among various commonly used antiarrhythmic drugs, flecainide is known to decrease conduction velocity in a rate-dependent manner. The aim of this study was to establish a protocol to monitor flecainidepsilas rate-dependent conduction slowing, during physiologic increases in heart rate (HR) in patients...
In this work, the analysis of atrial signals recorded during atrial fibrillation was pursued using two spectral estimators designed for series with missing data: the Lomb periodogram (LP) and the iterative singular spectrum analysis (ISSA). The main aim is to verify if subtraction of the ventricular activity might be avoided by performing spectral analysis on those ECG intervals where such activity...
During atrial fibrillation (AF), time-frequency analysis of atrial signal has been applied to describe fibrillatory frequency trends. Recently, temporal changes in spectral shape have been investigated using the spectral profile technique. This profile is computed recursively by fitting each short-time log-spectrum to a spectral template, using amplitude scaling and frequency shifting. The purpose...
Ventricular response (VR) during atrial fibrillation (AF) is a complex process, which is modulated by the autonomic nervous system (ANS). The purpose of this study was to characterize VR to both exercise as ANS stimulus and flecainide which is also supposed to have effects on the ANS. RR series were analyzed by means of time domain parameters and non-linear methods. In 15 patients (10 male, aged 55...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.