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Vol. 17. Issue 4.
Pages 151-156 (July - August 2010)
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Vol. 17. Issue 4.
Pages 151-156 (July - August 2010)
Open Access
Valor diagnóstico de los parámetros «más allá del ST» en la interpretación de la prueba de esfuerzo
Diagnostic value of the «beyond ST» parameters in the stress test interpretation
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Clara Saldarriaga1,
Corresponding author
clarais@une.net.co

Correspondencia: Clínica Cardiovascular Santa María, Calle 78 B No. 75-21, Medellín, Colombia. Teléfono: (054) 4454000 ext 4522.
, Gloria Franco1, Carlos I. Escobar1, Francisco E. López1, Mario Jaramillo1, Luisa F. Durango1, Doris Castañeda1, Ricardo Fernández1
1 Clínica Cardiovascular Santa María, Medellín, Colombia
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Article information
Introducción

Recientemente se han descrito nuevos parámetros y sistemas de puntaje que pretenden aumentar el valor diagnóstico y pronóstico de la prueba de esfuerzo, Este estudio tiene como objetivo describir la frecuencia de los parámetros más allá del ST en la población de pacientes que realizaron prueba de esfuerzo y calcular su valor diagnóstico adicional al rendimiento diagnóstico de la prueba con una población que realizó prueba de esfuerzo y coronariografía.

Metodología

Estudio de validez de pruebas diagnósticas, en el que se calculó el rendimiento diagnóstico de los siguientes parámetros de la prueba de esfuerzo: MET alcanzados cuando la prueba se hace positiva, índice de Duke, doble producto y ajuste del ST según la frecuencia cardiaca, por medio del cálculo de sensibilidad y especificidad.

Resultados

Se incluyeron 270 pacientes a quienes se les realizó prueba de esfuerzo y coronariografía, se calculó una sensibilidad de 70,74% y una especificidad de 46,34%, y posteriormente se realizó un nuevo análisis incluyendo los parámetros no ST (MET, índice ST/FC y doble producto) observando una mejoría en el rendimiento diagnóstico con una sensibilidad de 82,4% y especificidad 59,7%.

Conclusión

Los parámetros más allá del ST constituyen una herramienta para la clasificación adecuada de falsos positivos y falsos negativos de la prueba de esfuerzo.

Palabras clave:
prueba de esfuerzo
angiografía coronaria
enfermedad coronaria
Introduction

New parameters and score systems have been described recently pretending to increase the diagnostic and prognostic value of the stress test. The objective of this study is to describe the frequency of these parameters beyond the ST in the population of patients who underwent stress test and coronary angiography, and to calculate its diagnostic value.

Methodology

Observational retrospective study in which the diagnostic performance of the following parameters of the stress test was calculated: MET obtained when the test becomes positive, Duke index, double product and ST adjustment according to the heart rate by the sensibility and specificity calculation.

Results

270 patients that underwent stress test and coronary angiography were included. By means of a similar calculation to that of sensibility, named pseudo-sensibility (p sensibility) and pseudospecificity (p specificity), we calculated a sensibility of 70.74% and a specificity of 46.34%. A new analysis was further realized including non-ST parameters (METS, ST/HR index and double product), observing an improvement in diagnostic yield with a sensibility of 82.4% and a specifity of 59.7%.

Conclusion

Beyond ST parameters represent a main tool for the adequate classification of false positives and false negatives of the stress test.

Keywords:
stress test
coronary angiography
coronary heart disease
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Copyright © 2010. Sociedad Colombiana de Cardiología y Cirugía Cardiovascular
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