[Evaluation of three-dimensional speckle tracking echocardiography to left ventricular rotation and twist in patients with silent myocardial ischemia].

OBJECTIVE: To analyze the characteristics of left ventricular rotation and twist in patients with silent myocardial ischemia (SMI) by three-dimensional speckle tracking echocardiography (3D-STE), and to explore the diagnostic value of this method for SMI.
 METHODS: According to Gensini score, 66 patients with SMI were divided into 3 subgroups: a mild lesion group (n=16), a moderate lesion group (n=26) and a severe lesion group (n=24). Thirty patients with negative results in selective coronary angiography served as a control group. The parameters of wall motion score index (WMSI), left ventricular ejection fraction (LVEF), peak basal rotation (Ptw-B), peak apical rotation (Prot-A), left ventricular peak apical rotation (LVrot), left ventricular peak apical twist (LVtw) were measured.
 RESULTS: In the SMI group, with an increase in severity of myocardial ischemia, LVEF, Prot-A, Prot-B, LVrot, LVtw showed a decrease trend while WMSI exhibited an opposite phenomenon (P<0.05), and all of them displayed a significant corelation with Gensini score (P<0.05). In the diagnosis of SMI, all of the above-mentioned parameters were highly sensitive and specific. 3D-STE showed the highest diagnostic value for LVtw.
 CONCLUSION: Left ventricular rotation and twisting motion monitered by 3D-STE can evaluate the severity of myocardial ischemia in patients with SMI.