Objective To analyze the causal relationship between brain resting state functional magnetic resonance imaging(rsfMRI)network and myocardial infarction using the Mendelian randomization(MR)research method.Methods Four analytical methods of MR[inverse-variance weighted(IVW),weighted median method(WME),weighted mode method,and MR-Egger method]were used to conduct a two-way two-sample analysis between 191 types of rsfMRI phenotypes of the brain(34 691 types)and myocardial infarction.And based on the aggregated analysis of genome-wide association studies(GWAS)data,MR was used to explain the causal relationship between the two.Then,the IVW method was used for analysis and research as the main result,and other analytical methods were used as supplementary analyses.Finally,the credibility of the results was verified by using sensitivity analysis.Results The neural connection activities located at the edge of the fusiform gyrus of the temporal lobe and the default mode network[odds ratio(OR)=1.260,95%confidence interval(95%CI)1.120-1.420,P<0.001]may increase the risk of myocardial infarction.In addition,the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus,and cerebellum(OR=0.770,95%CI was 0.680-0.880,P<0.001),and the subcortical cerebellar and motor networks located in the cerebellum and paracentric lobules(OR=0.810,95%CI was 0.720-0.900,P<0.001)and the neural connection activities of the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus and subcortex(OR=0.730,95%CI was 0.630-0.840,P<0.001)were associated with a reduced risk of myocardial infarction.Sensitivity analysis showed that the research results were reliable,and after the reverse MR study,it was confirmed that there was no reverse causal association between the two.Conclusion The network signals located at the edge of the fusiform gyrus of the temporal lobe and in the default mode may be potential risk factors for myocardial infarction;the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus and cerebellum,as well as the subcortical cerebellar and motor networks located in the cerebellum and paracentric lobules,and the neural connection activities of the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus and subcortex may be potential protective factors,providing new ideas for the prevention and treatment of myocardial infarction.

Objective To analyze the causal relationship between brain resting state functional magnetic resonance imaging(rsfMRI)network and myocardial infarction using the Mendelian randomization(MR)research method.Methods Four analytical methods of MR[inverse-variance weighted(IVW),weighted median method(WME),weighted mode method,and MR-Egger method]were used to conduct a two-way two-sample analysis between 191 types of rsfMRI phenotypes of the brain(34 691 types)and myocardial infarction.And based on the aggregated analysis of genome-wide association studies(GWAS)data,MR was used to explain the causal relationship between the two.Then,the IVW method was used for analysis and research as the main result,and other analytical methods were used as supplementary analyses.Finally,the credibility of the results was verified by using sensitivity analysis.Results The neural connection activities located at the edge of the fusiform gyrus of the temporal lobe and the default mode network[odds ratio(OR)=1.260,95%confidence interval(95%CI)1.120-1.420,P<0.001]may increase the risk of myocardial infarction.In addition,the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus,and cerebellum(OR=0.770,95%CI was 0.680-0.880,P<0.001),and the subcortical cerebellar and motor networks located in the cerebellum and paracentric lobules(OR=0.810,95%CI was 0.720-0.900,P<0.001)and the neural connection activities of the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus and subcortex(OR=0.730,95%CI was 0.630-0.840,P<0.001)were associated with a reduced risk of myocardial infarction.Sensitivity analysis showed that the research results were reliable,and after the reverse MR study,it was confirmed that there was no reverse causal association between the two.Conclusion The network signals located at the edge of the fusiform gyrus of the temporal lobe and in the default mode may be potential risk factors for myocardial infarction;the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus and cerebellum,as well as the subcortical cerebellar and motor networks located in the cerebellum and paracentric lobules,and the neural connection activities of the motor and subcortical cerebellar networks located in the posterior central gyrus,anterior central gyrus and subcortex may be potential protective factors,providing new ideas for the prevention and treatment of myocardial infarction.