IEEE J Biomed Health Inform. 2018 Mar;22(2):429-441. doi: 10.1109/JBHI.2017.2671443. Epub 2017 Feb 17.
This work presents a new modular and low-complexity algorithm for the delineation of the different ECG waves (QRS, P and T peaks, onsets, and end). Involving a reduced number of operations per second and having a small memory footprint, this algorithm is intended to perform real-time delineation on resource-constrained embedded systems. The modular design allows the algorithm to automatically adjust the delineation quality in runtime to a wide range of modes and sampling rates, from a ultralow-power mode when no arrhythmia is detected, in which the ECG is sampled at low frequency, to a complete high-accuracy delineation mode, in which the ECG is sampled at high frequency and all the ECG fiducial points are detected, in the case of arrhythmia. The delineation algorithm has been adjusted using the QT database, providing very high sensitivity and positive predictivity, and validated with the MIT database. The errors in the delineation of all the fiducial points are below the tolerances given by the Common Standards for Electrocardiography Committee in the high-accuracy mode, except for the P wave onset, for which the algorithm is above the agreed tolerances by only a fraction of the sample duration. The computational load for the ultralow-power 8-MHz TI MSP430 series microcontroller ranges from 0.2% to 8.5% according to the mode used.
本工作提出了一种新的模块化、低复杂度的算法，用于描绘不同的 ECG 波（QRS、P 和 T 波峰、起始和结束）。该算法每秒涉及的操作数量较少，内存占用较小，旨在对资源受限的嵌入式系统进行实时描绘。模块化设计允许算法在运行时自动调整描绘质量，以适应多种模式和采样率，从无心律失常时的超低功耗模式（此时以低频对 ECG 进行采样）到完整的高精度描绘模式（此时以高频对 ECG 进行采样并检测所有 ECG 基准点），在心律失常的情况下。该描绘算法已使用 QT 数据库进行调整，提供了非常高的灵敏度和阳性预测性，并使用 MIT 数据库进行了验证。在高精度模式下，除了 P 波起始之外，所有基准点的描绘误差都低于心电图委员会共同标准规定的公差，而对于 P 波起始，算法仅超出商定公差的一小部分样本持续时间。根据所使用的模式，超低功耗 8-MHz TI MSP430 系列微控制器的计算负载范围为 0.2%至 8.5%。
