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Mapeo de la velocidad del chorro de resonancia magnética en estenosis de la válvula mitral y aórtica
P J Kilner1, C C Manzara, R H Mohiaddin
1Magnetic Resonance Unit, Royal Brompton National Heart and Lung Hospital, London, UK.
Circulation
|April 1, 1993
Resumen
El mapeo de la velocidad de cambio de fase por resonancia magnética (MR) mide con precisión el flujo de chorro turbulento en la estenosis de la válvula cardíaca. Esta técnica muestra buena concordancia con la ecografía Doppler, ofreciendo potencial para mejorar la evaluación de la estenosis.
Área de la Ciencia:
- Imágenes cardiovasculares por imágenes.
- Física médica La física médica es la física médica.
- Dinámica de flujo Dinámica de flujo
Sus antecedentes:
- El mapeo de la velocidad de cambio de fase por resonancia magnética (MR) se establece para el flujo no turbulento.
- Los tiempos de eco acortados permiten la aplicación de MR a un flujo de chorro turbulento.
- Se necesitaba una validación en pacientes con estenosis de la válvula cardíaca.
Objetivo del estudio:
- Para validar el mapeo de la velocidad del chorro MR en pacientes con estenosis de la válvula cardíaca.
- Para comparar las mediciones de RM con la ecocardiografía Doppler.
Principales métodos:
- Utilizó una máquina de resonancia magnética Picker de 0,5 T para la medición de la velocidad máxima del chorro postesténico.
- Se reclutaron 15 pacientes con estenosis mitral o aórtica.
- Se realizó una ecocardiografía Doppler simultánea para la comparación.
Principales resultados:
- 28 de los 29 estudios de RM (97%) arrojaron mapas de velocidad interpretables.
- Las mediciones de la velocidad del chorro pico MR y Doppler mostraron una buena concordancia (diferencia media de 0.23 m/s, SD 0.49 m/s).
- Las mediciones se tomaron en pacientes con estenosis mitral y aórtica.
Conclusiones:
- Las mediciones de la velocidad del chorro pico de RM in vivo se correlacionan bien con la ecografía Doppler.
- La técnica de resonancia magnética no está limitada por ventanas acústicas, a diferencia del Doppler.
- La RM tiene potencial para mejorar la evaluación de la estenosis, especialmente donde el acceso a la ecografía es difícil.
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