Utilidad de la determinación de endotelina-1 en el infarto agudo de miocardio / Usefulness of endothelin-1 assessment in acute myocardial infarction

Introducción y objetivos. Los valores elevados de endotelina-1 (ET-1) se han relacionado con un mal pronóstico tras un infarto agudo de miocardio con elevación del ST (IAMCEST). La vasoconstricción de la microcirculación coronaria parece ser el mecanismo causal. El objetivo de este estudio es analizar los efectos de la ET-1 sobre la microcirculación coronaria, el tamaño del infarto, la fracción de eyección del ventrículo izquierdo (FEVI) y el miocardio rescatado tras un IAMCEST. Métodos. Se determinaron los valores de ET-1 de 127 pacientes (6-24h) tras un IAMCEST. En 97 pacientes se realizó una resonancia magnética para evaluar la obstrucción microvascular (OM), el tamaño del infarto y la FEVI. El índice de miocardio rescatado (IMR) se definió como el porcentaje de área en riesgo angiográfica sin necrosis en la resonancia. Resultados. La edad media de la población fue de 60,9±11,8 años (77% varones). Los pacientes con valores de ET-1 por encima de la mediana presentaron un mayor porcentaje de OM (77,7% si ET-1>6,8 pg/ml frente a 16,6% si ET-1 ≤ 6,8 pg/ml; p<0,001) y menor IMR (13,8%±26% si ET-1>6,8 pg/ml frente a 37,4%±26% si ET-1 ≤ 6,8 pg/ml; p=0,02). Los valores de ET-1 no se asociaron de manera significativa con el tamaño del infarto (p=0,11) ni con la FEVI (p=0,16). En el análisis multivariable, los valores de ET-1 fueron predictores de OM (odds ratio [OR]=2,78; intervalo de confianza [IC] del 95%, 1,16-6,66; p=0,021) e IMR ≤ percentil 25 (OR=1,69; IC del 95%, 1,01-2,81; p=0,04). Conclusiones. Los valores elevados de ET-1 tras un IAMCEST se asocian a un mayor porcentaje de OM y un menor IMR (AU)

Introduction and objectives: High endothelin-1 (ET-1) levels have been linked to poor clinical outcomes after ST-segment elevation myocardial infarction (STEMI). Vasoconstriction of the coronary microcirculation seems to be the underlying mechanism. The aim of the study was to assess the effect of ET-1 on microvascular integrity, infarct size, left ventricular ejection fraction (LVEF) and myocardial salvage in evolving myocardial infarction (MI). Methods: We measured ET-1 levels acutely (6-24 h) in 127 patients presenting with their first STEMI. Contrast-enhanced cardiac magnetic resonance (ce-CMR) was performed in 94 patients within 1 week to assess microvascular obstruction (MO), infarct size and LVEF. A myocardial salvage index (MSI) was defined as the percentage of at-risk angiographic area without necrosis on the ce-CMR. Results: Mean age was 60.9 >= 11.8 years and 98 (77%) were males. Median ET-1 level within the first 24 h was 6.8 pg/mL (25th –75th percentile range: 5.4–8.5 pg/mL). Patients with ET-1 concentrations over the median presented higher percentage of MO (77.7% for ET-1 > 6.8 pg/mL vs. 16.6% for ET-1 6.8 pg/mL, P < .001) and lower MSI values (13.8 <= 26% for ET-1 > 6.8 pg/mL vs. 37.4 (26%) for ET-1 <= 6.8 pg/mL, P = .02). ET-1 levels did not show a significant association with infarct size (P = .11) and LVEF (P = .16). Multivariate analysis found ET-1 to be a significant predictor of MO (OR = 2.78; CI 95% 1.16-6.66; P = .021) and MSI <= Percentile 25 (OR = 1.69, CI 95% 1.01-2.81; P = .04). Conclusions: High ET-1 levels after myocardial infarction are associated with the presence of microvascular obstruction and lower myocardial salvage index (AU)

Usefulness of endothelin-1 assessment in acute myocardial infarction.

INTRODUCTION AND OBJECTIVES: High endothelin-1 (ET-1) levels have been linked to poor clinical outcomes after ST-segment elevation myocardial infarction (STEMI). Vasoconstriction of the coronary microcirculation seems to be the underlying mechanism. The aim of the study was to assess the effect of ET-1 on microvascular integrity, infarct size, left ventricular ejection fraction (LVEF) and myocardial salvage in evolving myocardial infarction (MI). METHODS: We measured ET-1 levels acutely (6-24h) in 127 patients presenting with their first STEMI. Contrast-enhanced cardiac magnetic resonance (ce-CMR) was performed in 94 patients within 1 week to assess microvascular obstruction (MO), infarct size and LVEF. A myocardial salvage index (MSI) was defined as the percentage of at-risk angiographic area without necrosis on the ce-CMR. RESULTS: Mean age was 60.9 ± 11.8 years and 98 (77%) were males. Median ET-1 level within the first 24h was 6.8 pg/mL (25(th) -75(th) percentile range: 5.4-8.5 pg/mL). Patients with ET-1 concentrations over the median presented higher percentage of MO (77.7% for ET-1>6.8 pg/mL vs. 16.6% for ET-1 ≤ 6.8 pg/mL, P<.001) and lower MSI values (13.8 ± 26% for ET-1>6.8 pg/mL vs. 37.4 (26%) for ET-1 ≤ 6.8 pg/mL, P=.02). ET-1 levels did not show a significant association with infarct size (P=.11) and LVEF (P=.16). Multivariate analysis found ET-1 to be a significant predictor of MO (OR=2.78; CI 95% 1.16-6.66; P=.021) and MSI ≤ Percentile 25 (OR=1.69, CI 95% 1.01-2.81; P=.04). CONCLUSIONS: High ET-1 levels after myocardial infarction are associated with the presence of microvascular obstruction and lower myocardial salvage index.