【摘要】 目的 :通过心音三维分析了解小儿心肌炎的心音特征。方法 :对 3 4例健康儿童和 2 6例心肌炎患儿在同一条件下进行心电心音同步采样 ,将获取的心音信息用计算机三维分析软件从频率、时间、强度三维领域分析研究。结果 :心肌炎患儿第二心音 (S2 )波峰前后 60ms面积与第一心音 (S1)面积之比值RTS 高于健康儿童 ,0 .0 5 >P >0 .0 1。S2 第 1谱峰峰值前后 5Hz范围内功率谱曲线所围面积 (A1)与 0～ 2 0 0Hz的功率谱曲线所围面积 (A2 )之比值RF△S低于健康儿童 ,P <0 .0 0 1。以频率响应 2 5～ 2 0 0Hz高频分析收缩期杂音 (SM )和舒张期杂音 (DM) ,显示心肌炎患儿SM和DM的RF△S明显高于健康儿童 ,P≤ 0 .0 0 1。以频率响应 0～ 10Hz低频分析 ,其RF△S值低于健康儿童 ,0 .0 5 >P >0 .0 1。结论 :心肌炎患儿S1强度明显减弱 ,S2 第 1谱峰低频成分减少 ,SM和DM明显且高频成分增多 ,SM低频成分减少。更多还原

【Abstract】 Objective To study the three dimensional characteristics of heart sound in children with myocarditis. Methods The domains of frequency,time and intensity of heart sound in 34 myocarditis children and 26 normal children were sampled and analysed through a computer software of three dimensional analysis.Results RT S of the second sound in time domain is higher,RF △S of the first spectral peak of second sound is lower in myocarditis children than that in normal children,the energy ratio of 25～200?Hz to 0～200 Hz of systolic and diastolic murmurs in frequency domain is higher in myocarditis children than that in normal children,but the energy ratio between 0～10 Hz is lower.Conclusion The intensity of the first sound,the low frequent components of the first peak of the second sound were reduced,the high frequent components of systolic and diastolic murmurs were increased and the low frequent component of systolic murmur was reduced in children with myocarditis.更多还原