Search results for "beat"

The chronnectome of musical beat

2020

Keeping time is fundamental for our everyday existence. Various isochronous activities, such as locomotion, require us to use internal timekeeping. This phenomenon comes into play also in other human pursuits such as dance and music. When listening to music, we spontaneously perceive and predict its beat. The process of beat perception comprises both beat inference and beat maintenance, their relative importance depending on the salience of beat in the music. To study functional connectivity associated with these processes in a naturalistic situation, we used functional magnetic resonance imaging to measure brain responses of participants while they were listening to a piece of music contai…

A re-entry tachycardia triggered by the spontaneous interruption of an atrial tachycardia.

2015

The common atrioventricular nodal re-entry tachycardia is the most common form of paroxysmal supraventricular tachycardia. It starts frequently with a supraventricular ectopic beat that, on finding the fast pathway in refractory period, travels in the slow pathway as to appear as a prolongation of the PR interval on the ECG. In this study, we show a singular case of a common atrioventricular nodal re-entry tachycardia triggered by the spontaneous interruption of an atrial tachycardia.

Cardiac kinematic parameters computed from video of in situ beating heart

2017

AbstractMechanical function of the heart during open-chest cardiac surgery is exclusively monitored by echocardiographic techniques. However, little is known about local kinematics, particularly for the reperfused regions after ischemic events. We report a novel imaging modality, which extracts local and global kinematic parameters from videos of in situ beating hearts, displaying live video cardiograms of the contraction events. A custom algorithm tracked the movement of a video marker positioned ad hoc onto a selected area and analyzed, during the entire recording, the contraction trajectory, displacement, velocity, acceleration, kinetic energy and force. Moreover, global epicardial veloc…

Heart rate turbulence for guiding electric therapy in patients with cardiac failure

2009

It is well-known that a reduction of the cardiac frequency variability, measurable with the Heart Rate Variability (HRV) system, is an indirect expression of the sympathetic-autonomic tone. Another index, Heart Rate Turbulence (HRT), has been recently suggested as a possible unit of measurement for the sympathetic-autonomic tone: this system allows to estimate the baro-reflex response of the carotid arteries to an early ventricular extra-systole by analysing heart rate variations induced by a premature beat.In our research we have analyzed this phenomenon in patients affected by moderate or severe cardiac failure. In particular, we divided 110 patients into two arms: subjects with or withou…

Estimating brain load from the EEG.

2009

Modern work requires cognitively demanding multitasking and the need for sustained vigilance, which may result in work-related stress and may increase the possibility of human error. Objective methods for estimating cognitive overload and mental fatigue of the brain on-line, during work performance, are needed. We present a two-channel electroencephalography (EEG)–based index, theta Fz/alpha Pz ratio, potentially implementable into a compact wearable device. The index reacts to both acute external and cumulative internal load. The index increased with the number of tasks to be performed concurrently (p= 0.004) and with increased time awake, both after normal sleep (p= 0.002) and sleep restr…

Deterioration of organization in the first minutes of atrial fibrillation: A beat-to-beat analysis of cycle length and wave similarity

2007

Deterioration of AF Organization. Introduction: It has been recently suggested that many episodes of atrial fibrillation (AF) may be partially organized at the onset and thus more suitable for antitachycardia pacing therapy. Nevertheless, the time course of organization in the first minutes of AF has not been quantified yet. Methods and Results: Twenty episodes of paroxysmal AF were studied. Electrograms were recorded from the right atrium (RA), distal (CSd), and proximal coronary sinus (CSp). The time course of AF cycle length (AFCL) and the regularity of wave morphology (similarity index S) were beat-to-beat measured at each recording site during the first 7 minutes of AF. AFCL and S show…

Binaural beats or 432 Hz music? which method is more effective for reducing preoperative dental anxiety?

2020

Background The aim of this prospective clinical study was to investigate the effectiveness of binaural beats and music at a frequency of 432 Hz and compare which method is more effective for reducing preoperative dental anxiety in impacted third molar surgery. Material and Methods Ninety patients were randomly selected to the binaural beats group, music group and control group. Visual analog scale used to evaluate dental anxiety before the local anesthesia in the first measurement. Local anesthesia was applied to the all patients. Patients in the music group listened to 432 Hz tuned music using earphones for 10 minutes. Patients in the binaural beats group listened to binaural beats using e…

Breu, 1791, 05, 24

Com a tít. el començament del text In festo Beatae Mariae ab Incarnatione monialis conversae professae Ordinis Carmelitarum Excalceatarum, ejusdem Ordinis in Galliis Fundatricis = Oraciones para la Misa del dia de la fiesta de la Beata Maria de la Encarnacion, religiosa lega professa de la Orden de Carmelitas Descalzas, y Fundadora de la misma Orden en Francia, p. [5-6]. Decretum Parisien. seu Rothomagen. = Decreto causa de Paris o de Roan, p. [6-7 Precedeix al tít., esc. xil. del Papa Pius VI, flaquejat per grav. xil. de Sant Pere i Sant Pau Bandes, filets Text a 2 col Sign.: *4

Gozos a la beata Mariana de Jesus, de la Orden de nuestra Señora de la Merced, Redencion de Cautivos

1750

El full orlat Grav. xil. enmarcat de "La Bta. Mariana de Jesus", flanquejat per gerros amb flors Text del goig a tres col. separades per filets

Decreto de la Sagrada Congregacion de Ritos, que aprueba dos milagros para la beatificacion de la V. Sierva de Dios Maria Ana de Jesus, mercenaria de…

1783

El Decret datat el 31 d'Agost de 1782 Sign.: a-b1 Reclams Text bilingüe a dues col. separades per banda: llatí i castellà