RESUMO
Objective: To explore the value of tissue motion annual displacement of the mitral valve (TMAD) for assessment of left atrial function in patients with coronary slow flow (CSF). Methods: Routine echocardiography was performed in 44 CSF patients (CSF group) and 42 patients without CSF (control group),and Left atrial ejection fraction (LAEF), left atrial passive ejection fraction (LAPEF) and active ejection fraction (LAAEF) were calculated with Simpson method. Then left atrial filling period displacement (TMAD_D), passive emptying period displacement (TMAD_P) and active emptying period displacement (TAMD_S) were assessed using TMAD. Results: Compared with control group, LAEF and LAAEF decreased, so did TMAD_D and TAMD_S in CSF group (all P<0.01). TMAD_D and TAMD_S were negatively correlated with mean thrombolysis in myocardial infarction frame count (TFC) of coronary artery in CSF group(r=-0.31, -0.36, both P<0.01). Conclusion: In CSF patients, left atrial reservoir and pump function were damaged, which become worse with the decreasing velocity of coronary flow. TMAD is reliable and feasible for evaluating left atrial function in patients with CSF, therefore providing important evidences for clinical treatment and prognosis.