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目的探讨心电图机3种频响范围对儿童心电图影响,为临床儿童心电图描记和诊断提供依据。方法选取2012年4月河南省郑州市某小学年龄5~6岁排除心脏疾患的健康儿童83例,按心电图机频响范围将其分为3组:第1组0.05～40Hz;第2组0.05～150Hz;第3组0.05～300Hz。分别在3种频响范围下描记每名儿童的心电图,测量分析RⅡ振幅并观察基线上毫伏级噪声。结果 (1)第1组与第2组、第1组与3组比较,差异均有统计学意义(P<0.017);第2组与第3组比较,差异无统计学意义(P>0.017);(2)第1组基线上未出现毫伏级噪声,波形光滑;第2、3组出现毫伏级噪声,波形不光滑,且第3组较第2组粗糙。结论心电图机频响在300Hz高频上限范围内时,数值越大,越能真实反映儿童心电图特征。
Objective To investigate the influence of three frequency ranges of electrocardiograph on the electrocardiogram in children and provide evidence for the electrocardiogram tracing and diagnosis in clinical children. Methods Eighty-three healthy children aged 5 to 6 years with primary heart disease who had been excluded from a primary school in Zhengzhou City, Henan Province from April 2012 were divided into three groups according to the frequency response range of electrocardiograph: group 1 0.05 ~ 40Hz; group 2 0.05 ~ 150Hz; Group 3 0.05 ~ 300Hz. The electrocardiogram of each child was traced separately in three frequency ranges. The RII amplitude was measured and the millivolt level noise was observed at baseline. Results (1) The differences between the first group and the second group, the first group and the third group were statistically significant (P <0.017); there was no significant difference between the second group and the third group (P> 0.017 ); (2) There is no millivolt noise on the baseline of group 1, and the waveform is smooth; the millivolt noise appears in group 2 and group 3, the waveform is not smooth, and group 3 is rougher than group 2. Conclusion Electrocardiograph frequency response in the high frequency range of 300Hz, the larger the value, the more able to truly reflect the characteristics of children’s ECG.