Examinando por Autor "Ortiz, M"

Mostrando 1 - 5 de 5

A New Algorithm for Rhythm Discrimination in Cardioverter Defibrillators Based on the Initial Voltage Changes of the Ventricular Electrogram
(2009-07-23T08:37:22Z) Rojo-Álvarez, José Luis; Arenal Maíz, Ángel; García Alberola, A; Ortiz, M; Valdés, M; Artés Rodríguez, A
Changes in Cardiac Indices from Implanted Defibrillator-Stored Electrograms Due to Acquisition and Preprocessing Conditions
(2009-06-15T09:41:57Z) Requena Carrión, J; Rojo-Álvarez, José Luis; Everss, E; Alonso Atienza, Felipe; Sánchez Muñoz, JJ; Ortiz, M; García Alberola, A
A wide number of cardiac indices have been proposed to describe electrocardiograms (ECG) during ventricular Fibrillation (VF), and they can be useful when analyzing electrograms (EGM) stored in Implantable Cardioverter Defibrillator (ICD) during spontaneous VF. However, the dependence of their measurement on acquisition and preprocessing conditions has not been so far statistically quantified. We propose a systematic procedure based on nonparametric bootstrap resampling methods to obtain standard errors and confidence intervals for a test. This test detects changes in the statistical distribution of cardiac indices from ICD-stored EGM during VF, due to discrepancies in acquisition and preprocessing conditions. As an application example, significant changes in the distributions of selected spectral indices due to lead configuration were found by comparing measurements obtained from simultaneo usly recorded unipolar and bipolar EGM during VF. Our nonparametric bootstrap approach can be readily applied to the measurement of cardiac indices, allowing us to study their changes under a diversity of conditions in a systematic way.
Effects of the Location of Myocardial Infarction on the Spectral Characteristics of Ventricular Fibrillation
(2009-07-23T10:00:40Z) Sánchez Muñoz, Juan J; Rojo-Álvarez, José Luis; García Alberola, A; Everss, E; Requena Carrión, Jesús; Ortiz, M; Alonso Atienza, Felipe; Valdés, M
Relationship between 12-lead-electrocardiograms and electrograms stored in implantable cardioverter defibrillator
(2009-07-28T09:58:53Z) Castilla, L.; Almendral Garrote, J.; Atienza Fernández, F.; Rojo-Álvarez, José Luis; Everss, E; González Torrecilla, E.; Arenal Maíz, Ángel; Datino, T; Atea, L; Ortiz, M; Fernández Avilés, F.
Spectral Analysis of Sustained and Non-Sustained Ventricular Fibrillation in Patients With an Implantable Cardioverter-Defibrillator
(2009-07-28T09:32:56Z) Sánchez Muñoz, JJ; Rojo-Álvarez, José Luis; García Alberola, A; Requena Carrión, J; Everss, E; Ortiz, M; Martínez Sánchez, Juan; Valdés, M