Abstract: Objective To investigate the value of plasma N-terminal brain natriuretic peptide precursor (NT-proBNP) and total cholesterol (TC) levels of patients with heart valve disease predicting malignant arrhythmia(MA). Methods Totally 168 patients with heart valve disease were selected to constitute a research group, and other 30 healthy persons who had physical examination in the same period were selected to constitute a control group. Enzyme-linked immunosorbent (ELISA) was applied in detection of plasma NT-proBNP and TC levels of the control group and the research group preoperative (T₀), postoperative 1d (T₁), 3d (T₂), 1 week (T₃), and 1 month (T₄). The research group was followed up for two years and the occurrence of MA was statistically analyzed. The research groups were divided into MA group (n=18) and non-MA group(n=150) two subgroups according to the occurrence of MA. perioperative plasma NT-proBNP and TC levels of MA group and non-MA group were compared and receiver operating characteristic curve (ROC) was applied in analysis of value of plasma NT-proBNP and TC levels of patients with heart valve disease predicting the MA. Results Compared with control group, perioperative plasma NT-proBNP and TC levels of the research group were increased; compared with T₀, T₁, T₃ and T₄ plasma NT-proBNP and TC levels of the research group were lower (P<0.05). MA incidence of the research group was 10.71% (18/168), and perioperative plasma NT-proBNP and TC levels of MA group were higher than that of non-MA group (P<0.05). ROC curve analysis results showed that when the cutoff valued of plasma NT-proBNP and TC level were 728.28 pg/mL and 4.15 mmol/L, the AUC=0.884(95%CI:0.791-0.936), there was 17 patients with MA on the curve, thus the sensitivity was 94.44%, and there was 148 cases of patients without MA under the curve, thus the specificity was 98.67%, and the accuracy, positive predictive value and negative predictive value were 98.21%, 89.47% and 99.33% respectively. Value of plasma NT-proBNP and TC levels of patients with heart valve disease predicting MA was good. Conclusion Plasma NT-proBNP and TC levels of patients with heart valve disease were higher and the value of the two above items unitedly predicting MA is good. This may be associated with the NT-proBNP relating with cardiac function injury and TC regulating heart electrolyte balance effect, thus plasma NT-proBNP and TC levels of patients with heart valve disease could predict MA and thus to provide basis for improving outcomes.

Key words: N-terminal brain natriuretic peptide precursor(NT-proBNP), cholesterol, predict, heart valve disease, malignant arrhythmia