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The aim of the study is to assess the short time recovery of the right ventricular systolic function in inferior wall infarction patients with or without right ventricular (RV) myocardial infarction after percutaneous coronary intervention (PCI) by using 2-dimensional (2D) speckle tracking imaging (STI) longitudinal strain (LS) parameters.
38 consecutive patients diagnosed with inferior wall myocardial infarction (IWMI) and treated with percutaneous coronary intervention were included in our study. 17 of them were combined with right ventricular myocardial infarction (RVMI). 24 chest pain patients admitted at the same time but with negative results in the selective coronary angiography were served as blank control. Echocardiography were performed at baseline and for 15 patients before discharged from the hospital (5.2±2.3 days). Right ventricular 2D strain parameters were then analyzed off line.
The RV global LS (RVGLS), the LS of the basal and mid segments of the free wall and septum were lower than control group in the patient group (P<0.05). Compared with INFMI group, the RVGLS, the LS of the mid and apical segments of the free wall were lower in the RVMI group (P<0.05). Few days after PCI, basement and middle segments of the free wall (P<0.01) were higher with smaller right ventricular end diastolic (P<0.01) and systolic (P<0.05) area. Tricuspid annular plane systolic excursion were also higher than before (P<0.05).
The 2D-STI RVLS parameters precisely reflected the impaired RV systolic function in the INFMI and RVMI patients, the RV global systolic function were even worse when RVMI involved, mainly for the RV free wall. However, few days after PCI, the RVLS parameters improved quickly and remarkably in both of the INFMI and RVMI patients. The study demonstrates that RVLS parameters could provide more early diagnostic and prognostic information of RV dysfunction in acute INFMI patients with and without RVMI and after successful PCI, right ventricular systolic function could recover rapidly in only few days.