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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | McLaughlin, N.B. Campbell, R.W.F. Murray, A. |
| Copyright Year | 1994 |
| Description | Author affiliation: Regional Med. Phys. Dept., Freeman Hospital, Newcastle upon Tyne, UK (McLaughlin, N.B.) |
| Abstract | Automatic QT interval measurement methods of T wave end determination include: the threshold crossing point of (a) the T wave and (b) the differential of the T wave and (c) the intercept of the isoelectric level and the maximum T wave slope. The aim of this study was to assess the effects of ECG filtering and threshold and isoelectric levels on these techniques using thirty 12 lead ECGs with a range of T wave morphologies. Low pass filtering (40 Hz vs. 100 Hz) resulted in the following changes in QT measurement relative to manual reference values: a -1 ms, b +34 ms, c -19 ms. Increasing high pass filtering (0.05 to 0.5 Hz) decreased the mean value for all techniques. Reducing threshold levels increased mean values by 14 ms (a) and 8 ms (b). The choice of isoelectric level had little effect on c while a increased by 15 ms. Filtering and parameter choice influence automatic QT measurement techniques and their effects need to be considered when comparing results.< |
| Starting Page | 221 |
| Ending Page | 224 |
| File Size | 337667 |
| Page Count | 4 |
| File Format | |
| ISBN | 081866570X |
| DOI | 10.1109/CIC.1994.470210 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1994-09-25 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Filtering algorithms Measurement techniques Electrocardiography Heart rate interval Low pass filters Time measurement Cardiology Morphology Bandwidth Digital filters |
| Content Type | Text |
| Resource Type | Article |
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