THE VALUE OF SULPHUR-CONTAINING AMINO-ACIDS IN BLOOD PLASMA AS PROGNOSTIC MARKERS OF COMPLICATED COURSE OF ST-SEGMENT ELEVATION MYOCARDIAL INFARCTION (STEMI) WITHOUT REPERFUSION THERAPY
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Keywords

myocardial infarction, systolic dysfunction of left ventricle, acute heart failure, sulphur-containing aminо acids

How to Cite

Iaremenko, O., Iordanova, N., & Dudka, P. (2018). THE VALUE OF SULPHUR-CONTAINING AMINO-ACIDS IN BLOOD PLASMA AS PROGNOSTIC MARKERS OF COMPLICATED COURSE OF ST-SEGMENT ELEVATION MYOCARDIAL INFARCTION (STEMI) WITHOUT REPERFUSION THERAPY. Medical Science of Ukraine (MSU), 14(3-4), 66-73. https://doi.org/10.32345/2664-4738.3-4.2018.09

Abstract

Relevance. The sulfation of homocysteine is an important element in protecting cells against ischemic-reperfusion injury. In clinical studies the positive effect of N-acetylcysteine ​​on the reduction of necrosis was found in patients with STEMI.

Objective of this study was to evaluate the baseline levels of sulphur-containing amino acids in plasma as predictors of early (on the day of admission) systolic dysfunction of left ventricle (SDLV) and acute heart failure (HF) in patients with STEMI without reperfusion therapy (RT).

Material and methods. 92 patients with STEMI without RT were examined. The content of free plasma sulphur-containing aminо acids (homocysteine, cysteine ​​and methionine) was investigated on the day of admission by ion-exchanged liquid-column chromatography.

Results. The complications of STEMI were associated with increased baseline levels of sulphur-containing aminо acids, especially, cysteine ​​and methionine. Its levels were significantly higher (at 71.7%, р<0.01, and 41.3%, р<0.05, respectively) in patients with early SDLV compared with patients with ejection fraction of left ventricle (LVEF) >40%. The multivariate logistic regression analysis revealed that the baseline level of cysteine in patients with STEMI remained an independent predictor of early (on the day of admission) SDLV (OR=17.4, p<0.001) after adjustment for anamnestic and laboratory factors. The sensitivity and specificity of baseline cysteine ​​level >0.49 mg/dl as a marker of early SDLV were 73.9% and 65.2% respectively (AUC=0.72, p=0.006). The multivariate analysis revealed that the baseline level of methionine was an independent predictor of acute HF on the day of admission after adjustment for laboratory factors (OR=25.9, p<0.001). Also methionine was an independent predictor of persistent / late HF on third day or later in total sampling (OR=25.9, p<0.001) after adjustment for demographic, anamnestic and clinic factors (OR=68.7, p<0.0001), as well as after adjustment for laboratory risk factors (OR=42.5, p<0.0001). The sensitivity and specificity of baseline methionine ​​level >0.31 mg/dl as a marker of persistent / late HF were 87.5% and 63.3% respectively (AUC = 0.77, p <0.0001). Also the baseline level of methionine was an independent predictor of persistent / late HF in patients with EFLV >40% after adjustment for demographic and anamnestic factors (OR=113.3, p <0,0001). The sensitivity and specificity of methionine ​​level >0.41 mg/dl as a marker of persistent / late HF in patients with EFLV >40% were 80.0% and 81.0% respectively (AUC=0.80, р<0.0001).

Conclusions. The complicated course of STEMI without RT is associated with increased level of sulphur-containing aminо acids, especially, cysteine ​​and methionine. A higher level of cysteine ​​is associated with early SDLV independently from anamnesis risk factors and creatinine level in plasma. The risk of persistent / late HF (on third day and later) is associated with a higher level of methionine independently from demographic, anamnestic, clinical and laboratory factors risk.

https://doi.org/10.32345/2664-4738.3-4.2018.09
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