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Valor pronóstico de las imágenes de perfusión miocárdica en pacientes con alta tolerancia al ejercicio
S N Chatziioannou1, W H Moore, P V Ford
1Department of Radiology, Baylor College of Medicine, St. Luke's Episcopal Hospital/Texas Heart Institute, Houston 77030, USA. schatziioannou@sleh.com
Circulation
|February 23, 1999
Resumen
La imagen de perfusión miocárdica (MPI) predice con precisión los eventos cardíacos en pacientes con alta tolerancia al ejercicio, a diferencia del ECG del ejercicio (EECG). El MPI es una herramienta de pronóstico crucial para evaluar el riesgo cardíaco en esta población.
Área de la Ciencia:
- Cardiología Cardiología.
- Imágenes de diagnóstico por imágenes.
- Cardiología Preventiva Cardiología preventiva.
Sus antecedentes:
- Una alta tolerancia al ejercicio suele indicar un buen pronóstico en las enfermedades cardiovasculares.
- El valor pronóstico de la imagen de perfusión miocárdica anormal (MPI) en pacientes con alta tolerancia al ejercicio sigue sin estar claro.
- La electrocardiografía por ejercicio (EECG) se usa comúnmente, pero puede tener limitaciones en este grupo de pacientes.
Objetivo del estudio:
- Para comparar la utilidad pronóstica de MPI y EECG en pacientes con alta tolerancia al ejercicio.
- Para determinar si MPI puede predecir eventos cardíacos adversos en individuos que logran altos niveles de esfuerzo físico.
- Evaluar el poder predictivo independiente y combinado de MPI y EECG para los resultados cardíacos.
Principales métodos:
- Análisis retrospectivo de 388 pacientes consecutivos que se sometieron a MPI de ejercicio y alcanzaron al menos la etapa IV de Bruce.
- Evaluación de seguimiento para eventos cardíacos adversos, incluida la revascularización, el infarto de miocardio y la muerte cardíaca.
- Análisis de regresión de riesgos proporcionales de Cox para evaluar el poder predictivo de MPI y EECG.
Principales resultados:
- 157 pacientes (40,5%) tenían resultados anormales de MPI.
- La MPI anormal se asoció con una tasa significativamente mayor de eventos cardíacos adversos (12,2% frente a 1,7%, P<0,001).
- El MPI fue un excelente predictor de eventos cardíacos (riesgo relativo = 8), mientras que el EECG no mostró poder predictivo.
Conclusiones:
- La imagen de perfusión miocárdica (MPI) sirve como un poderoso indicador de pronóstico para eventos cardíacos adversos en pacientes con alta tolerancia al ejercicio.
- El ejercicio de ECG (EECG) carece de un valor predictivo significativo para los eventos cardíacos en esta cohorte específica de pacientes.
- MPI por sí solo proporciona información prognóstica superior en comparación con la combinación de EECG (incluida la puntuación de Duke) con MPI.
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