Objective To test synchronization of cardiac mechanical contraction by means of advanced echocardiography and investigate the correlation of left ventricular ejection fraction (LVEF) and the indexes of mechanical dyssynchrony, and the relationship between DTI, STI and RT-3DE.Methods Control group (20 cases), chronic heart failure with a widened QRS complex (12 cases) and chronic heart failure with a shortened QRS duration (10 cases) were selected. We evaluated mechanical dyssynchrony with the DTI, the STI and the RT-3DE, and analyzed the correlation between the improvement degree of cardiac function and indexes of mechanical dyssynchrony, and the correlation between DTI, STI and RT-3DE. Results (1) In CHF groups (including shortened QRS group and widened QRS group), the indexes of synchronization of cardiac mechanical contraction were higher than control group ( <0.05) . (2) However, the indexes of mechanical dyssynchrony before operation showed no statistically significant difference between the widened QRS group and the shortened QRS group (>0.05) . (3) In CHF groups (including shortened QRS group and widened QRS group), the indexes of mechanical dyssynchrony before operation were higher more than after operation ( <0.05) . (4) In postoperation, the indexes of mechanical dyssynchrony showed no statistically significant difference between the widened QRS group and the shortened QRS group ( >0.05) . (5) There was a significant negative correlation between the LVEF and the indexes of mechanical dyssynchrony (<0.01) . (6) .In the indexes of synchronization of cardiac mechanical contractions, there are significant positive correlations between the DTI, the STI and the RT-3DE ( <0.01) . Conclusion Echocardiography can be used to screen CHF patients,and patients with left ventricular synchronous (including shortened QRS duration) can also be benefited from CRT.

Objective This study was purposed to analyze and summarize the vein temporary cardiac pacing therapy in patients with acute inferior wall myocardial infarction complicated by high degree atrioventricular block (AVB) . Methods One hundred and twelve patients with acute inferior wall myocardial infarction complicated by high degree AVB were selected as observation and research subjects, and they were treated by vein temporary cardiac pacing therapy. The safety, availability of different kinds of this surgical methods and the relationship between these surgical methods and complication were observed. Results Three out of 60 patients who were treated by ordinary temporary pacing electrode catheter were suffering from cardiac tamponade. No serious complications occurred when 52 patients were treated by floating temporary pacing electrode catheter. Conclusion Floating temporary pacing electrode catheter have already proved safe and effective in the treatment of acute inferior wall myocardial infarction complicated by AVB, and it could decrease the incidence of serious complications such as myocardial perforation.

Objective To study the ralationship of arrhythmias and heart electrical parameters changes after transcatheter closure of ventricular septal defect (VSD) .Method 50 patients had been successfully finnished the transcatheter closure of ventricular septal defect,and then we observed ralationship of arrhythmias and heart electrical parameters changes. Results (1) Compared with the situation of VSD occluder preoperative and postoperative, during follow-up there were 20 arrhythmia cases, including bundle branch block 16 cases, including the complete left bundle branch block 2 cases,complete right bundle branch block 4 cases,a transient third-degree trioventricular conduction block 1 case, most return to normal in the follow-up. 2 Intracavitary electrogram showed before and after transcatheter closure:A-V conduction parameters A-H,H-V value of (75.10 ± 14.34) ms vs (80.67±23.03) ms and (47.9±12.61) ms vs (50.07±15.23) ms,the difference was not statistically significant ( >0.05) . Conclusions (1) Some patients with new ECG changes after transcatheter closure of VSD, manifested as an increase in bundle branch block in a week, but most return to normal,the prognosis is good. (2) Intraoperative A-H,H-V extension is not related with with postoperative slow arrhythmia;(3) Arrhythmia is a common complication after VSD transcatheler closure, to strictly selecte indications,and to avoid too large diameter are the effective measures to reduce the arrhythmias after transcatheter closure of ventricular septal defect (VSD) .

Objective To analyze and summarize the treatment strategies for unstable angina with no-reflow phenomenon after PTCA during early percutaneous interventional procedures.Methods A total of 32 cases with unstable angina were divided into two groups:one group with drug therapy and the other group with drug therapy and thrombus aspiration catheter.The patients were chosen when there was no-reflow phenomenon after PTCA during early percutaneous interventional procedures and their clinical data were compared and analyzed.Blood flow TIMI grade,myocardial perfusion grade (MBG),TIMI myocardial perfusion (TMP) grade and other indexes were observed and recorded.Results The general conditions had no statistical difference between two groups.Compared with the drug therapy group,the proportion of patients with TIMI,MBG and TMP grade 3 was higher in aspiration and drug therapy group (89％ VS 71％ P＜0.05).Conclusion Drug therapy and thrombus aspiration catheter in treatment helps to improve myocardial perfusion level for unstable angina with no no-reflow phenomenon after PTCA during early percutaneous interventional procedures.