Cardiac electric axis of dynamic electrocardiogram
ZHAO Xiao-ping
ZHU Zheng-yan
ZHANG Hong-wei
CAO Guan-hong
CHUO Yu-juan
LIU Xiao-juan
Abstract：Objective To discuss the change laws and influencing factors of cardiac electric axis in dynamic electrocardiogram (DCG). Methods The patients (n=313) with sinus frontal QRS axis offset were chosen and divided into 3 groups according to axis offset status:group 1 (with left axis deviation, n=205), group 2 (with right axis deviation, n=97) and group 3 (with axis of no man's land, n=11). The degree and dynamic changes of axis offset, and correlation between these changes and heart rate (HR) were observed. Results The sex constituent ratio has no statistical difference in 3 groups (P>0.05), and age was significantly higher in group 1 and group 3 than that in group 2 (P<0.01). The percentage of patients with complications was significantly higher in group 3 than that in group 1 (P<0.05) and group 2 (P<0.01), and that was significantly higher in group 1 than that in group 2 (P<0.01). In 3 groups, a large percentage of patients had dynamic axis changes due to offset, and there was statistical difference in comparison among 3 groups (P<0.01). The dynamic axis changes was correlated to HR, and exacerbated as HR increased, and there was statistical difference in comparison among 3 groups (P<0.05). Conclusion The axis offset is correlated to aging, and a large percentage of patients has dynamic axis changes and frequency dependence. As age increases, axis will deviate to the left and/or no man's land, and deviation degree will exacerbate as HR increases. The axis of no man's land has the highest pathological significance.
Keywords：Dynamic electrocardiogramCardiac electric axisAge trendFrequency dependence
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 97-99 )