106Plasma trimethylamine N-oxide is associated with culprit plaque characterization as assessed by optical coherence tomography in patients with acute myocardial infarction

Abstract

Abstract Background Previous study have demonstrated that plasma trimethylamine N-oxide (TMAO) is associated with vulnerable plaque characteristics as assessed by optical coherence tomography (OCT) in patients with coronary artery disease. However, the relation between TMAO and the culprit plaque characteristics as assessed by OCT in patients with acute myocardial infarction (AMI) exhibiting plaque rupture at the site of the culprit stenosis is unknown. Objective To explore the relation between plasma TMAO and coronary culprit plaque characterization assessed by OCT in AMI patients exhibiting plaque rupture. Method We prospectively enrolled 90 AMI patients with plaque rupture identified by OCT and collected demographic data, risk factors, coronary angiography and OCT data, medical history and laboratory findings of all patients. Plasma TMAO levels were detected by stable isotope dilution liquid chromatography tandem mass spectrometry. Macrophage presence in coronary culprit plaque was quantified by normalized standard deviation (NSD). Result All patients were divided into two groups (high TMAO group and low TMAO group) according to the median plasma TMAO level (3.22uM). The culprit plaques in the high TMAO group exhibited a thinner fibrous cap thickness (60um [60–100um] versus 90um [70–110um], P=0.013]), higher frequency of thin-cap fibroatheroma (TCFA) (15.6% versus 55.6%, P<0.001), microvessel (24.4% versus 4.4%, P=0.014) and macrophage infiltration (66.7% versus 26.7%, P<0.001) compared with the low TMAO group. Moreover, the level of TMAO was significantly positively associated with NSD (Pearson's correlation coefficient: r=0.766, P<0.001). Conclusion Plasma TMAO levels are associated with coronary plaque vulnerability and inflammation in patients with AMI exhibiting plaque rupture. Acknowledgement/Funding Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (2016-I2M-1-009)