Abstract
The 12-lead ECG can be described as the projection of a time-varying dipole on the lead vectors. This dipole-source assumption implies that the different leads must show a high coherence and that deviations from values close to unity may indicate the presence of noise. We evaluated the average coherence in the band of 5 Hz to 45 Hz in 309 ECGs and compared the coherence measure with an automatic out-of-band noise evaluation, quantified at a scale from 0 (clean) to 10 (very noisy). The generalized magnitude squared coherence (GMSC), which is a global measure of the linear relationships among the leads, was used. A high coherence (GMSC> 0. 95) was always associated with very low noise (level 0 or 1) and 0.9<GMSC<0.95 was associated with levels 0-2. For noise levels > 2 the GMSC was <0.87 in all cases. There were no cases of high noise level and a high coherence, however, in 32% of the cases with noise level 0 or 1 the GMSC was <0.8. For low-noise ECGs the GMSC is close to unity, with a good correlation between noise level and GMSC for normal ECGs. However, a low coherence also seems to be associated with abnormalities in the ECG, which will be subject for further study.
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Computing in Cardiology |
| Vol/bind | 41 |
| Sider (fra-til) | 37-40 |
| Antal sider | 4 |
| ISSN | 2325-8861 |
| Status | Udgivet - 1 jan. 2014 |
| Begivenhed | 41st Computing in Cardiology Conference, CinC 2014 - Cambridge, USA Varighed: 7 sep. 2014 → 10 sep. 2014 |
Konference
| Konference | 41st Computing in Cardiology Conference, CinC 2014 |
|---|---|
| Land/Område | USA |
| By | Cambridge |
| Periode | 07/09/2014 → 10/09/2014 |
| Sponsor | et al., IEEE/EMBS, Massachusetts Institute of Technology, Mortara, Philips, PhysioNet |