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Objective To observe young adults with normal stereo ECG (vector) Figure ventricular depolarization characteristics and comparative analysis with the plane, three-dimensional ECG (vector) provide the basis for clinical application diagram. Observed 20 to 40 years 200 cases of normal young people (male and female 100 cases), divided into two groups according to gender, underwent electrocardiogram, vector graphics, three-dimensional ECG (vector) drawing checks. ECG electrodes connected by Wilson lead system; vector graphics, three-dimensional ECG electrodes connected by Frank lead system [1]. ECG acquisition, vector graphics, three-dimensional ECG (vector) after drawing three-dimensional ECG data analysis software for three-dimensional ECG (vector) Figure ventricular depolarization uptime, maximum vector magnitude and angle, the initial vector magnitude and angle within 40ms, three-dimensional QRS ring parties bit run time data. Data processing and statistical analysis using SPSS13.0 statistical analysis software, measurement data with the mean ± standard deviation (((x | -) | -) ± S), for t-test, and calculate the distribution of 95% of the measured data the normal range ( normal: (x | -)-1.96S as the lower limit, (x | -) 1.96S ceiling; skewed distribution: 2.5% for the lower limit, 97.5% for the upper limit); homogeneity of variance test, the two sample mean compared using the t-test comparison between groups using analysis of variance, with P lt; 0.05 was considered statistically significant. 1, three-dimensional QRS loop running time, the maximum vector magnitude and angle (a) running time of the normal range male 80ms ~ 107ms, women 76ms ~ 108ms; maximum amplitude vector normal males (0.67mV ~ 2.39mV), female (0.72mV ~ 2.02mV), there was significant difference between male and female sex (male gt; females, P lt; 0.05); maximum vector angle normal range Male: Elevation 20 ° ~ 86 °, azimuth -108 ° ~ 38 °, Female: elevation angle 15 ° ~ 85 °, azimuth -107 ° ~ 41 °. (2) QRS loop amplitude of the largest three-dimensional vector difference compared with the plane were significant (stereo gt; plane, P lt; 0.05). 2, three-dimensional initial 10ms ~ 40ms QRS loop vector magnitude and angle (a) both men and women, the initial 10ms ~ 40ms vector amplitude increases gradually with time, the angle with time gradually from the front right next (or previous) turn left, its amplitude and angle normal ranges were: male 10ms vector: 0.001mV ~ 0.12mV, elevation 42 ° ~ 144 °, azimuth 46 ° ~ 124 °, 20ms vector: 0.02mV ~ 0.46mV, elevation 53 ° ~ 123 °, azimuth angle 35 ° ~ 117 °, 30ms vector: 0.12mV ~ 0.94mV, elevation 47 ° ~ 97 °, azimuth 5 ° ~ 103 °, 40ms vector: 0.42mV ~ 1.52mV, elevation 28 ° ~ 78 °, azimuth - 47 ° ~ 67 °; female 10ms vector: 0.01mV ~ 0.12mV, elevation 51 ° ~ 141 °, azimuth 45 ° ~ 119 °, 20ms vector: 0.004mV ~ 0.40mV, elevation 47 ° ~ 129 °, azimuth 37 ° ~ 107 °, 30ms vector: 0.10mV ~ 0.88mV, elevation 37 ° ~ 99 °, azimuth -2 ° ~ 92 °, 40ms vector: 0.40mV ~ 1.46mV, elevation 27 ° ~ 72 °, azimuth -46 ° ~ 60 °. (2) the initial 10ms ~ 20ms vector magnitude, gender differences were statistically significant compared to (male gt; females, P lt; 0.05); initial 30ms vector azimuth gender difference was statistically significant (P lt; 0.05); initial 40ms vector elevation difference between genders was significant (P lt; 0.05); (3) QRS loop initial 40ms moment vector magnitude of each three-dimensional vector graphics compared with the plane were significant differences (stereo gt; plane, P lt; 0.05). 3, three-dimensional position QRS loop running time major parties running time bit left under (male 5ms ~ 46ms, women 8ms ~ 40ms) and left lower (male 4ms ~ 49ms, women 6ms ~ 53ms), compared between males and females, only the left After running time difference between genders was significant (P lt; 0.05). Conclusion 1, three-dimensional vector QRS loop maximum amplitude greater than (or equal to) the maximum in each plane QRS loop vector amplitude. 2, three-dimensional vector QRS loop maximum amplitude observations simple and intuitive (without three-plane analysis), the maximum vector magnitude, angle change on the degree of ventricular hypertrophy and sensitive than planar vector graphics, accurate. 3, three-dimensional rotating three-dimensional analysis to better observe the QRS loop initial amplitude and instantaneous cardiac vector angle, better to avoid the tears caused by the projection intensive ECG and vector graphics to make up the lack of three-dimensional ECG (vector) Figure clinical application basis.
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