{"id":59507,"date":"2018-03-09T22:47:21","date_gmt":"2018-03-09T22:47:21","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/relacion-de-los-intervalos-qt-y-rr-del-electrocardiograma-de-superficie-modelizacion-mediante-redes-neuronales\/"},"modified":"2018-03-09T22:47:21","modified_gmt":"2018-03-09T22:47:21","slug":"relacion-de-los-intervalos-qt-y-rr-del-electrocardiograma-de-superficie-modelizacion-mediante-redes-neuronales","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-medicas\/relacion-de-los-intervalos-qt-y-rr-del-electrocardiograma-de-superficie-modelizacion-mediante-redes-neuronales\/","title":{"rendered":"Relaci\u00f3n de los intervalos qt y rr del electrocardiograma de superficie. modelizaci\u00f3n mediante redes neuronales"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Emilio Garc\u00eda Moran <\/strong><\/h2>\n<p>Introducci\u00f3n     el intervalo qt del ecg de superficie se prolonga en relaci\u00f3n directa al intervalo rr precedente. La forma matem\u00e1tica de la relaci\u00f3n at\/rr m\u00e1s usada fue descrita por bazett en 1920 y es la base del concepto de \u00abqt corregido\u00bb (qtc). Posteriormente se han propuesto otras f\u00f3rmulas por el rendimiento insuficiente de las habituales. La relaci\u00f3n precisa del at\/rr no se ha descrito definitivamente. El objetivo del presente trabajo es determinar mediante redes neuronales nuevos modelos para describir la relaci\u00f3n at\/rr y comparar los resultados con los modelos previos.  metodolog\u00eda     se midieron a mano los intervalos at y rr del electrocardiograma de superficies de paciente ingresados y ambulatorios, sin datos de cardiopat\u00eda. Se determin\u00f3 la variabilidad intraobservador e interobservador de las medidas. Se desarrollaron dos tipo de modelos de redes neuronales: el perceptr\u00f3n multicapa (multilayer perceptron, mlp) y las funciones de base radial (radial basis functions, rbf). El enterramiento y validaci\u00f3n de los modelos fue programado en java 5.0 por el autor de la tesis. Los modelos nuevos y cl\u00e1sicos fueron comparados respecto al error medio cuadr\u00e1tico (root mean square error, rmse), error medio absoluto (mean absolute error, mae), comportamiento a frecuencias extremas (menor 50 lpm, mayor 100 lpm) y an\u00e1lisis de regresi\u00f3n.  resultados     entre agosto de 2006 y enero de 2007 fueron medidos 2107 electrocardiogramas de pacientes entre 14 y 98 a\u00f1os de edad. Un 49,3% eran varones. Las redes mlp ofrecen resultados de la relaci\u00f3n semejantes al modelo exponencial-rectil\u00edneo. Los modelos rbf de forma consistente muestran una relaci\u00f3n sigmoide entre los intervalos at y rr. los valores de rmse y mae fueron un 25% m\u00e1s altos para el modelo de bazett que para el resto. Los valores de rmse y mae de las redes mlp y rbf igualaron a los de los modelos cl\u00e1sicos de mejor rendimiento global. A frecuencias extremas s\u00f3lo los modelos mlp, rbf y f<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Relaci\u00f3n de los intervalos qt y rr del electrocardiograma de superficie. modelizaci\u00f3n mediante redes neuronales<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Relaci\u00f3n de los intervalos qt y rr del electrocardiograma de superficie. modelizaci\u00f3n mediante redes neuronales <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Emilio Garc\u00eda Moran <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Valladolid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 29\/06\/2007<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li> Pozo Crespo Fernando Del<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Miguel Lopez coronado <\/li>\n<li>ricardo Rigual bonastre (vocal)<\/li>\n<li>candido Martin luengo (vocal)<\/li>\n<li> Poveda sierra Jos\u00e9 Juan (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Emilio Garc\u00eda Moran Introducci\u00f3n el intervalo qt del ecg de superficie se prolonga en relaci\u00f3n directa al [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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