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This database includes 12 half-hour ECG recordings and 3 half-hour recordings of noise typical in ambulatory ECG recordings. The noise recordings were made using physically active volunteers and standard ECG recorders, leads, and electrodes; the electrodes were placed on the limbs in positions in which the subjects’ ECGs were not visible. The three noise records were assembled from the recordings by selecting intervals that contained predominantly baseline wander (in record 'bw'), muscle (EMG) artifact (in record 'ma'), and electrode motion artifact (in record 'em'). Electrode motion artifact is generally considered the most troublesome, since it can mimic the appearance of ectopic beats and cannot be removed easily by simple filters, as can noise of other types.
The ECG recordings were created by the script nstdbgen- using two clean recordings (118 and 119) from the MIT-BIH Arrhythmia Database, to which calibrated amounts of noise from record 'em' were added using nst. (The process of making such records is now simpler; the simplified script nstdbgen can be used with current versions of the WFDB software package to recreate these records.) Noise was added beginning after the first 5 minutes of each record, during two-minute segments alternating with two-minute clean segments. The signal-to-noise ratios (SNRs) during the noisy segments of these records are:
Record | SNR (dB) | Record | SNR (dB) |
---|---|---|---|
118e24 | 24 | 119e24 | 24 |
118e18 | 18 | 119e18 | 18 |
118e12 | 12 | 119e12 | 12 |
118e06 | 6 | 119e06 | 6 |
118e00 | 0 | 119e00 | 0 |
118e_6 | -6 | 119e_6 | -6 |
Since the original ECG recordings are clean, the correct beat annotations are known even when the noise makes the recordings visually unreadable. The reference annotations for these records are simply copies of those for the original clean ECGs.
Name Last modified Size Description
Parent Directory - 118e00.atr 02-Aug-1992 05:35 4.5K reference annotations bw.dat 02-Aug-1992 09:39 1.9M digitized signal(s) bw.hea- 02-Aug-1992 09:39 117 header file em.dat 02-Aug-1992 09:39 1.9M digitized signal(s) em.hea- 02-Aug-1992 09:39 116 header file ma.dat 02-Aug-1992 09:39 1.9M digitized signal(s) ma.hea- 02-Aug-1992 09:39 114 header file nstdbgen- 02-Aug-1992 09:39 1.2K 118e24.dat 02-Aug-1992 10:03 1.9M digitized signal(s) 118e24.hea 02-Aug-1992 10:03 176 header file 118e24.atr 02-Aug-1992 10:03 4.5K reference annotations 118e18.dat 02-Aug-1992 10:03 1.9M digitized signal(s) 118e18.atr 02-Aug-1992 10:03 4.5K reference annotations 118e18.hea 02-Aug-1992 10:03 175 header file 118e12.atr 02-Aug-1992 10:04 4.5K reference annotations 118e12.dat 02-Aug-1992 10:04 1.9M digitized signal(s) 118e12.hea 02-Aug-1992 10:04 177 header file 118e06.atr 02-Aug-1992 10:04 4.5K reference annotations 118e06.dat 02-Aug-1992 10:04 1.9M digitized signal(s) 118e06.hea 02-Aug-1992 10:04 175 header file 118e00.dat 02-Aug-1992 10:05 2.5M digitized signal(s) 118e00.hea 02-Aug-1992 10:05 173 header file 118e_6.atr 02-Aug-1992 10:06 4.5K reference annotations 118e_6.dat 02-Aug-1992 10:06 2.5M digitized signal(s) 118e_6.hea 02-Aug-1992 10:06 172 header file 119e24.atr 02-Aug-1992 10:06 4.7K reference annotations 119e24.dat 02-Aug-1992 10:06 1.9M digitized signal(s) 119e24.hea 02-Aug-1992 10:06 175 header file 119e18.atr 02-Aug-1992 10:07 4.7K reference annotations 119e18.dat 02-Aug-1992 10:07 1.9M digitized signal(s) 119e18.hea 02-Aug-1992 10:07 175 header file 119e12.atr 02-Aug-1992 10:08 4.7K reference annotations 119e12.dat 02-Aug-1992 10:08 1.9M digitized signal(s) 119e12.hea 02-Aug-1992 10:08 174 header file 119e06.atr 02-Aug-1992 10:08 4.7K reference annotations 119e06.dat 02-Aug-1992 10:08 1.9M digitized signal(s) 119e06.hea 02-Aug-1992 10:08 175 header file 119e00.dat 02-Aug-1992 10:09 2.5M digitized signal(s) 119e00.atr 02-Aug-1992 10:09 4.7K reference annotations 119e00.hea 02-Aug-1992 10:09 170 header file 119e_6.dat 02-Aug-1992 10:10 2.5M digitized signal(s) 119e_6.hea 02-Aug-1992 10:10 171 header file 119e_6.atr 02-Aug-1992 10:10 4.7K reference annotations nstdb.doc 02-Aug-1992 10:54 1.9K nstdb.txt 02-Aug-1992 10:54 1.9K 118e00.xws 12-Dec-1999 23:29 91 WAVEScript 118e06.xws 12-Dec-1999 23:29 91 WAVEScript 118e12.xws 12-Dec-1999 23:29 91 WAVEScript 118e18.xws 12-Dec-1999 23:29 91 WAVEScript 118e24.xws 12-Dec-1999 23:29 91 WAVEScript 118e_6.xws 12-Dec-1999 23:29 91 WAVEScript 119e00.xws 12-Dec-1999 23:29 91 WAVEScript 119e06.xws 12-Dec-1999 23:29 91 WAVEScript 119e12.xws 12-Dec-1999 23:29 91 WAVEScript 119e18.xws 12-Dec-1999 23:29 91 WAVEScript 119e24.xws 12-Dec-1999 23:29 91 WAVEScript 119e_6.xws 12-Dec-1999 23:29 91 WAVEScript bw.xws 12-Dec-1999 23:29 80 WAVEScript em.xws 12-Dec-1999 23:29 80 WAVEScript ma.xws 12-Dec-1999 23:29 80 WAVEScript RECORDS 29-Mar-2000 17:12 93 list of record names ANNOTATORS 14-Oct-2000 04:32 59 list of annotators nstdbgen 08-Nov-2002 09:01 730 MD5SUMS 13-Jul-2005 07:17 2.8K SHA1SUMS 13-Jul-2005 07:17 3.3K SHA256SUMS 18-Sep-2007 18:39 4.9K old/ 14-Jul-2011 16:50 - ma.hea 15-Feb-2012 00:28 90 header file em.hea 15-Feb-2012 00:28 92 header file bw.hea 15-Feb-2012 00:28 93 header file DOI 21-Sep-2015 19:00 19 local.css 28-Oct-2015 23:02 3.1K
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