自由活动状态下的连续心电记录

Continuous ECG Recording for Freely Moving Patients

随着老年化社会的到来以及慢性心脏病患者的日益增多,自由活动状态下的长时间动态心电监护成为必要。本文采用低倍数放大、高分辨率模数转换和实时数字滤波等技术,设计了一种微型心电记录系统,具有输入信号动态范围(ISDR)>100dB、共模抑制比>100dB、内部噪声水平<5μV(RMS)等特征,使用2节7号电池可连续工作24h以上,并可将心电数据保存在存储卡内。实验表明,在静止、走路、运动等状态下记录的心电P-QRS-T波群显示平滑清晰,能够满足自由活动状态下心电监护和分析的要求。

As more and more people are becoming aged in China and many of them tend to suffer from chronic cardiac probtems, the long-term dynamic cardiac monitoring for freely moving patients becomes essential. A new design for continuous ECG recording on the freely moving patients at home and/or at work is proposed here. It is miniature in size, using digital technologies of the low gain amplifier, the high resolution analog to digital converter and the real- time digital filter that features 〉100dB input signal dynamic range （ISDR）, 〉 100dB common-mode rejection ratio （CMRR）, and 〈 5μV（RMS） internal noise. The device works continuously more than 24 hours with a pair of AAA batteries, and is capable of storing the recorded data into a storage card. The preliminary tests showed that the P- QRS-T waveforms were captured and displayed smoothly in resting, walking, and activities, making the device use- ful in monitoring and analyzing for the patients on the move.