Objective To investigate the risk factors of microcirculation obstruction(MVO)after reperfusion in patients with acute myocardial infarction(AMI).Methods Forty-one patients with AMI who received treatment with myocardial reperfusion were retrospectively selected.Cardiac magnetic resonance(CMR)was used to determine whether the patients had MVO.The patients were divided into MVO and non-MVO groups.The basic data,laboratory examination and CMR parameters of patients were collected and compared between the groups,and the risk factors related to MVO were screened out by logistic regression analysis.Results Delayed myocardial enhancement was observed in all 41 patients,among which 11 cases(26.8%)were with MVO.A total of 206 delayed myocardial enhancement segments were observed,of which 77 segments combined with MVO and 129 segments without MVO.AMI patients with MVO had a higher rate of transmural myocardial infarction,greater infarct volume,left ventricular myocardial mass(LVMM)and edema degree,as well as lower ejection fraction of left and right ventricles(P<0.05).Multivariate logistic regression analysis indicated that infarct volume[odds ratio(OR)=1.116,95%confidence interval(CI)1.017-1.224,P=0.020]was an independent risk factor for MVO after AMI reperfusion.Conclusion Infarct volume is an independent risk factor for MVO after AMI reperfusion,and MVO is associated with left and right ventricular function impairment.

Objective To explore the altered expression of circular RNA (circRNA) and mRNA in the mouse cortex in the early phase of subarachnoid hemorrhage (SAH) and possible biological functions of the circRNA in early brain injury (EBI).Methods A total of 18 C57BL/6J male mice were randomly divided into a sham and a SAH group (n=9).SAH models were prepared by endovascular perforation.Total RNAs of brain samples were extracted to construct the cDNA library 24 h after operation.RNA-sequencing (RNA-seq) was carried out by HiSeqTM 2500 User Guide and followed by RT-qPCR for confirmation.Reads were aligned to the mouse transcriptome to obtain expression profiles ofcircRNA and mRNA.Bioinformatic study included GO analysis,KEGG pathway analysis and forecast of targeted miRNA of circRNA.Results A total of 26 circRNA (6 up-regulated and 20 down-regulated) and 804 mRNA (396 up-regulated and 408 down-regulated) were significantly changed.These altered mRNA were mainly related to regulation of neuronal synaptic plasticity,inflammatory and immune response.Bioinformatics showed that some significantly altered circRNA contained binding sites for many miRNA.The RT-qPCR analysis of 4 randomly selected circRNA (circFoxj3,circSetbp1,circArpp21 and circ2010111 I01Rik) confirmed the accuracy of RNA-seq.Conclusions SAH alters the expression of circRNA in mouse cortex and the differentially expressed circRNA may be involved in regulation of EBI following SAH,promising a potential therapeutic target for the diagnosis,treatment and prognosis of SAH.