modulo 2 electrocardiografia clinica. electrocardiograma normal 1° parte
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Onda U
Es una deflexión de baja frecuencia, aparece después de la onda T, y tiende a no ser visible a FC >85 lpm.
Posiblemente corresponda a repolarización ventricular tardía,repolarización de los músculos papilares o del sistema His-Purkinje cuyos potenciales transmembrana son prolongados.
Algunos autores prefieren la medición del intervalo Q-U paraevaluar el tiempo total de repolarización ventricular.
Causas de ondas U prominentes:
- Hipokalemia- Isquemia miocárdica aguda grave (en derivaciones precordiales).