FAST AND RELIABLE QRS ALIGNMENT TECHNIQUE FOR HIGH-FREQUENCY ANALYSIS OF SIGNAL-AVERAGED ECG

被引:19
作者
ESCALONA, OJ
MITCHELL, RH
BALDERSON, DE
HARRON, DWG
机构
[1] UNIV ULSTER,DEPT ELECT & ELECTR ENGN,NEWTOWNABBEY BT37 0QB,ANTRIM,NORTH IRELAND
[2] UNIV ULSTER,NO IRELAND BIOENGN CTR,NEWTOWNABBEY,ANTRIM,NORTH IRELAND
[3] QUEENS UNIV BELFAST,DEPT THERAPEUT & PHARMACOL,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND
关键词
ALIGNMENT TECHNIQUE; COHERENT AVERAGING; COMPUTER SIMULATION; HIGH-FREQUENCY ECG; LATE POTENTIALS; NOISE; SIGNAL-AVERAGED ECG; TRIGGER JOTTER;
D O I
10.1007/BF02446662
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The process of QRS alignment as required in signal-averaged ECG can impose serious limitations on the spectral range of the signal output. This effect depends basically on the particular alignment technique being used and on the level and type of noise present in the recorded ECG. In clinical studies where a wide-band (1000 Hz) ECG averager is required, the conventional QRS alignment technique, based on maximum coherence matching (MCM) with a template beat, may not perform consistently well. An alternative QRS alignment technique based on the accurate detection of a single fiducial point (SFP) in the bandpass filtered (3-30 Hz) QRS complex was developed Using computer simulation methods, a comparative assessment of the frequency bandwidths (3 dB points) offered by both MCM and SFP techniques as a function of noise level (1 5-100 mu RMS) and type (EMG and 50 Hz interference), was carried out. The results of the comparative assessment indicated a better performance by the SFP technique in all cases of noise. Hence, the SFP technique would perform more reliably for high-frequency analysis of a noisy ECG, especially when 50 Hz interference is high. Furthermore, SFP is considerably faster than MCM (about four times) when implemented digitially, and its analogue realisation is feasible. The SFP technique is suitable for late-potential analysis in the signal-averaged ECG.
引用
收藏
页码:S137 / S146
页数:10
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