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A continuación se introduce un catéter de diagnóstico, que es un tubo largo y estrecho, por el introductor y sobre la guía metálica de 0,875 centímetros (0,35"), dentro del vaso sanguíneo. A continuación se lleva este catéter hacia la aorta y se retira la guía metálica. Una vez que el catéter está ubicado en la abertura u ostium de una de las arterias coronarias, el médico inyecta colorante y toma una serie de radiografías (película de las imágenes).

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