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Repolarización temprana: fenotipos electrocardiográficos asociados con un resultado favorable a largo plazo
Jani T Tikkanen1, M Juhani Junttila, Olli Anttonen
1Institute of Clinical Medicine, Department of Internal Medicine, University of Oulu, Oulu, Finland. jani.tikkanen@oulu.fi
Circulation
|June 3, 2011
Resumen
La repolarización temprana (RE) en los ECG aumenta el riesgo de muerte por arritmia. Sin embargo, los patrones específicos del segmento ST después de ER, como el tipo ascendente común en los atletas, indican una variante benigna y no aumentan este riesgo.
Área de la Ciencia:
- Cardiología Cardiología.
- La electrocardiografía es una técnica de electrocardiografía.
- Muerte cardíaca súbita y súbita.
Sus antecedentes:
- La repolarización temprana (RE) en las derivaciones inferiores/laterales del ECG está relacionada con un mayor riesgo de muerte súbita por arritmia.
- Las variaciones en las características del segmento ST después de las formas de onda ER pueden tener importancia pronóstica.
Objetivo del estudio:
- Investigar la importancia pronóstica de las variaciones del segmento ST después de la repolarización temprana (ER) en electrocardiogramas (ECG).
- Determinar si las morfologías específicas del segmento ST asociadas con ER pueden diferenciar a los individuos con y sin mayor riesgo de muerte por arritmia.
Principales métodos:
- Análisis de ECGs de atletas jóvenes (Finlandia, n=62; EE.UU., n=503) para caracterizar la morfología del segmento ST después de ER.
- Evaluación de ECGs de una población general de mediana edad (n = 10,864) para evaluar el impacto pronóstico de las variaciones del segmento ST asociadas a ER en el riesgo de muerte por arritmia.
Principales resultados:
- La variante ST ascendente / ascendente fue la forma dominante de ER en atletas (96% finlandés, 85% estadounidense).
- En la población general, la ER con una variante ST horizontal/descendiente (n=412) mostró un aumento de la proporción de riesgo de muerte por arritmia (RR 1.43).
- La ER de mayor amplitud (> 0,2 mV) con una variante ST horizontal/descendiente aumentó significativamente la proporción de riesgo de muerte por arritmia (RR 3.14), mientras que la variante ST ascendente no mostró un mayor riesgo (RR 0.89).
Conclusiones:
- Las variaciones de la morfología del segmento ST asociadas con ER son cruciales en la estratificación del riesgo de muerte por arritmia en individuos de mediana edad.
- El patrón de segmento ST rápidamente ascendente, prevalente en atletas sanos, parece ser una variante benigna de ER.
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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...