The Study Of Graphic Differences Between Surface And Dynamic Electrocardiogram

Objective: Both electrocardiogram and dynamic electrocardiogram are wildly-used methods clinically. There are some differences in graph due to the different connecting parts of body. However, we still haven’t known the differences between QRS Complex of 12-lead ECG and 12-lead DCG. The study is aimed to reveal the differences between them in order to get better clinical effect.Method: Analyse the differences by comparing the ECG and DCG graphs from the same patient. The first part is about the analysis of the patient with ventricular premature of the outflow tract confirmed by radiofrequency catheter ablation. The second part is about the comparison with patient who is normal in physical examination in order to explore the graphic difference. 1 Target people 1.1 Select 24 patients in department of cardiology, the Second Hospital of Hebei Medical University. 20 of them are female, while 4 male, at the age of 24-63(49.71±11.08). The patients were treated radiofrequency ablation of right ventricular premature by CARTO system from Aug,2012 to Jan,2015. ECG and DCG were used in the guide of CARTO system, located in anterior septum. They are defined as the group of premature beat and divided into the group of ECG and DCG. 1.2 Select 104 hospitalized patients of arrhythmia, unstable angina pectoris(UA),in the First Central Hospital of Baoding City. 49 of them are male, while 55 femal, at the age of 16-83(48.79±17.23). ECG and DCG were conducted to the patients from Jan, 2014 to Jan, 2015. They are defined as the group of non-premature beat and divided into the group of ECG and DCG. 2 Measurement and statistical methodMeasure the 12-lead ECG and select the QRS Complex main wave amplitude of their similar heart rate(no more than 10%). Compare the result of the patient with ventricular premature in the same way. 3 Statistical methodThe quantitative data are represented as mean±standard deviation(SD) by SPSS19.0. And paired sample T test is used in comparison of statistical data between groups. When P<0.05,there is a significant difference.Result: 1 The group of ventricular premature of outflow tract 1.1 The group of ventricular premature in ECGlead I(-0.44±0.41)mv,lead II(1.94±0.46) mv,lead III(1.82±0.42)mv,lead a VR(-1.02±0.27) mv,lead a VL(-1.56±0.36)mv, lead a VF(1.90±0.44)mv,lead V1(-0.95±0.47) mv,lead V2(-1.10±0.78)mv、lead V3(0.37±1.38)mv,lead V4(1.35±0.97) mv, lead V5(1.76±0.60) mv,lead V6(1.68±0.49)mv 1.2 The group of ventricular premature in DCG:I lead(-0.55±0.35)mv,II lead(2.26±0.59) mv,III lead(2.41±0.54) mv,a VR lead(-1.13±0.36)mv,a VL lead(-1.31±0.30)mv,a VF lead(2.38± 0.60) mv,V1lead(-0.86±0.36)mv,V2lead(-1.10±0.69)mv,V3lead(0.37±0.98)mv,V4 lead(1.56±0.85)mv,V5 lead(1.96±0.43)mv,V6 lead(1.88±0.40)mv.The comparison of ECG and DCG:In the lead of II,III,a VL,a VF, P<0.05,there is a significant difference.In the lead I,a VR,V1~V6,P>0.05,there is no significant difference. 2 The group of non-ventricular premature: 2.1 The group of non-ventricular premature in ECG:I lead(0.70±0.86)mv,II lead(0.80±0.36)mv,III lead( 0.43±0.50)mv, a VR lead(-0.70±0.27)mv,a VL lead(-0.10±0.54)mv,a VF lead(0.70±0.43)mv, V1 lead(-0.66±0.59) mv,V2 lead(-0.62±0.64) mv,V3 lead(0.79±0.65) mv,V4 lead(1.23±0.41) mv,V5 lead(1.34±0.36)mv,V6 lead( 0.94±0.29)mv 2.2 The group of non-ventricular premature in DCG:I lead(0.62±0.25)mv,II lead(0.73±0.29)mv,III lead(0.40±0.41)mv,a VR lead(-0.63±0.25)mv,a VL lead(-0.15±0.53)mv,a VF lead(0.57±0.35)mv,V1 lead(-0.61±0.47)mv,V2 lead(-0.54±0.65)mv,V3 lead(0.79±0.63)mv,V4 lead(1.22±0.37)mv,V5 lead(1.34±0.35)mv,V6 lead(0.96±0.32)mvThe comparison of ECG and DCG: In the lead of II, a VR, a VF,P<0.05, there is a significant difference. In the lead I,III, a VL, V1~V6,P>0.05, there is no significant difference.Conclusions:In the group of anterior septum ventricular premature of these patients,the amplitude of QRS Complex main wave of the electroca- rdiogram lower than the dynamic electrocardiogram in the lead of Ⅱ, Ⅲ,a VL,a VF.But in the group of non-ventricular premature of those patients, the amplitude of QRS Complex main wave of the electrocardiogram higher than the dynamic electrocardiogram in the lead ofⅡ,a VR, a VF.