T-Wave Alternans Challenge Database
This database has been assembled for the
PhysioNet/Computers in Cardiology Challenge
2008. It contains 100 multichannel ECG records sampled at 500 Hz
with 16 bit resolution over a ± 32 mV range. The subjects
include patients with myocardial infarctions, transient ischemia,
ventricular tachyarrhythmias, and other risk factors for sudden
cardiac death, as well as healthy controls and synthetic cases with
calibrated amounts of T-wave alternans. Specific information about
individual records (which was withheld during the challenge) is now
available here.
Since these records come from a variety of sources, some of them have been
resampled and scaled from original recordings sampled at higher or lower
resolution in order to present them in a uniform format here. In most cases,
each record contains the standard 12 diagnostic ECG signals, but a few contain
only 2 or 3 signals. Each record is approximately two minutes in duration.
Each record consists of 3 files in standard PhysioBank format:
- twann.hea: a short (text) header file that specifies the
format of the record including the number and names of the signals.
- twann.dat: a long (binary) signal file containing the
digitized signals.
- twann.qrs: a medium-length (binary) annotation file
containing the times of occurrence of the QRS complexes within the record.
Although a few of the records contain ectopic beats, all beats are marked
within the .qrs files as if normal.
For convenience, the entire collection of records in this directory
(.hea, .dat, and .qrs files) can be downloaded
in a single compressed archive file,
twadb.tar.gz (about 72 Mb).
Instructions for unpacking .tar.gz archive files are
here.
The WFDB Software Package, freely available
from this site, contains a wide variety of open-source applications for
reading, viewing, reformatting, and analyzing these files and those belonging
to other PhysioBank records. You can also write your own software that reads
these files using the WFDB library included in the WFDB Software Package.
Alternatively, see How to obtain
PhysioBank data in text form.
Name Last modified Size Description
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Parent Directory -
![[ ]](/icons/unknown.gif)
ANNOTATORS 21-Apr-2008 10:52 21
MD5SUMS 28-Apr-2008 11:34 13K
RECORDS 20-Apr-2008 20:02 600
SHA1SUMS 28-Apr-2008 11:34 15K
SHA256SUMS 28-Apr-2008 11:34 23K
twa00.dat 20-Apr-2008 20:02 234K
twa00.hea 20-Apr-2008 20:02 105
twa00.qrs 20-Apr-2008 20:02 308
twa01.dat 20-Apr-2008 20:02 1.4M
twa01.hea 20-Apr-2008 20:02 477
twa01.qrs 21-Apr-2008 08:13 560
twa02.dat 20-Apr-2008 20:02 234K
twa02.hea 20-Apr-2008 20:02 108
twa02.qrs 20-Apr-2008 20:02 836
twa03.dat 20-Apr-2008 20:02 1.3M
twa03.hea 20-Apr-2008 20:02 513
twa03.qrs 20-Apr-2008 20:02 688
twa04.dat 20-Apr-2008 20:02 352K
twa04.hea 20-Apr-2008 20:02 145
twa04.qrs 20-Apr-2008 20:02 382
twa05.dat 20-Apr-2008 20:02 234K
twa05.hea 20-Apr-2008 20:02 109
twa05.qrs 20-Apr-2008 20:02 908
twa06.dat 20-Apr-2008 20:02 1.4M
twa06.hea 20-Apr-2008 20:02 477
twa06.qrs 20-Apr-2008 20:02 496
twa07.dat 20-Apr-2008 20:02 352K
twa07.hea 20-Apr-2008 20:02 145
twa07.qrs 20-Apr-2008 20:02 422
twa08.dat 20-Apr-2008 20:02 234K
twa08.hea 20-Apr-2008 20:02 107
twa08.qrs 20-Apr-2008 20:02 420
twa09.dat 20-Apr-2008 20:02 1.5M
twa09.hea 20-Apr-2008 20:02 486
twa09.qrs 20-Apr-2008 20:02 532
twa10.dat 20-Apr-2008 20:02 234K
twa10.hea 21-Apr-2008 09:12 108
twa10.qrs 20-Apr-2008 20:02 260
twa11.dat 20-Apr-2008 20:02 1.3M
twa11.hea 20-Apr-2008 20:02 510
twa11.qrs 20-Apr-2008 20:02 540
twa12.dat 20-Apr-2008 20:02 1.3M
twa12.hea 20-Apr-2008 20:02 507
twa12.qrs 20-Apr-2008 20:02 398
twa13.dat 20-Apr-2008 20:02 1.5M
twa13.hea 20-Apr-2008 20:02 481
twa13.qrs 20-Apr-2008 20:02 522
twa14.dat 20-Apr-2008 20:02 352K
twa14.hea 20-Apr-2008 20:02 144
twa14.qrs 20-Apr-2008 20:02 564
twa15.dat 20-Apr-2008 20:02 1.4M
twa15.hea 20-Apr-2008 20:02 491
twa15.qrs 21-Apr-2008 08:28 556
twa16.dat 20-Apr-2008 20:02 1.4M
twa16.hea 20-Apr-2008 20:02 517
twa16.qrs 21-Apr-2008 08:38 532
twa17.dat 20-Apr-2008 20:02 1.4M
twa17.hea 20-Apr-2008 20:02 481
twa17.qrs 21-Apr-2008 08:39 582
twa18.dat 20-Apr-2008 20:02 1.3M
twa18.hea 20-Apr-2008 20:02 500
twa18.qrs 20-Apr-2008 20:02 580
twa19.dat 20-Apr-2008 20:02 1.3M
twa19.hea 20-Apr-2008 20:02 507
twa19.qrs 20-Apr-2008 20:02 462
twa20.dat 20-Apr-2008 20:02 1.3M
twa20.hea 20-Apr-2008 20:02 509
twa20.qrs 20-Apr-2008 20:02 526
twa21.dat 20-Apr-2008 20:02 1.4M
twa21.hea 20-Apr-2008 20:02 478
twa21.qrs 20-Apr-2008 20:02 508
twa22.dat 20-Apr-2008 20:02 234K
twa22.hea 20-Apr-2008 20:02 106
twa22.qrs 20-Apr-2008 20:02 260
twa23.dat 20-Apr-2008 20:02 234K
twa23.hea 21-Apr-2008 09:11 105
twa23.qrs 20-Apr-2008 20:02 556
twa24.dat 21-Apr-2008 08:44 1.4M
twa24.hea 21-Apr-2008 08:44 516
twa24.qrs 21-Apr-2008 08:44 338
twa25.dat 20-Apr-2008 20:02 1.4M
twa25.hea 20-Apr-2008 20:02 506
![[VID]](/icons/movie.gif)
twa25.qrs 20-Apr-2008 20:02 492
twa26.dat 20-Apr-2008 20:02 1.4M
twa26.hea 20-Apr-2008 20:02 526
twa26.qrs 20-Apr-2008 20:02 334
twa27.dat 20-Apr-2008 20:02 1.3M
twa27.hea 20-Apr-2008 20:02 522
twa27.qrs 20-Apr-2008 20:02 386
twa28.dat 20-Apr-2008 20:02 1.4M
twa28.hea 20-Apr-2008 20:02 478
twa28.qrs 21-Apr-2008 08:53 552
twa29.dat 20-Apr-2008 20:02 1.5M
twa29.hea 20-Apr-2008 20:02 482
twa29.qrs 21-Apr-2008 08:54 604
twa30.dat 20-Apr-2008 20:02 1.5M
twa30.hea 20-Apr-2008 20:02 494
twa30.qrs 20-Apr-2008 20:02 534
twa31.dat 20-Apr-2008 20:02 1.2M
twa31.hea 20-Apr-2008 20:02 506
twa31.qrs 20-Apr-2008 20:02 568
twa32.dat 20-Apr-2008 20:02 352K
twa32.hea 20-Apr-2008 20:02 143
twa32.qrs 20-Apr-2008 20:02 664
twa33.dat 20-Apr-2008 20:02 1.4M
twa33.hea 20-Apr-2008 20:02 484
twa33.qrs 21-Apr-2008 08:56 604
twa34.dat 20-Apr-2008 20:02 1.4M
twa34.hea 20-Apr-2008 20:02 483
twa34.qrs 20-Apr-2008 20:02 512
twa35.dat 20-Apr-2008 20:02 1.5M
twa35.hea 20-Apr-2008 20:02 482
twa35.qrs 20-Apr-2008 20:02 534
twa36.dat 20-Apr-2008 20:02 1.3M
twa36.hea 20-Apr-2008 20:02 497
twa36.qrs 20-Apr-2008 20:02 590
twa37.dat 20-Apr-2008 20:02 352K
twa37.hea 20-Apr-2008 20:02 146
twa37.qrs 20-Apr-2008 20:02 406
twa38.dat 20-Apr-2008 20:02 1.3M
twa38.hea 20-Apr-2008 20:02 508
twa38.qrs 20-Apr-2008 20:02 364
twa39.dat 20-Apr-2008 20:02 1.4M
twa39.hea 20-Apr-2008 20:02 518
twa39.qrs 20-Apr-2008 20:02 650
twa40.dat 20-Apr-2008 20:02 1.2M
twa40.hea 20-Apr-2008 20:02 516
twa40.qrs 20-Apr-2008 20:02 472
twa41.dat 20-Apr-2008 20:02 1.2M
twa41.hea 20-Apr-2008 20:02 508
twa41.qrs 20-Apr-2008 20:02 436
twa42.dat 20-Apr-2008 20:02 1.2M
twa42.hea 20-Apr-2008 20:02 506
twa42.qrs 20-Apr-2008 20:02 480
twa43.dat 20-Apr-2008 20:02 352K
twa43.hea 20-Apr-2008 20:02 144
twa43.qrs 20-Apr-2008 20:02 342
twa44.dat 20-Apr-2008 20:02 1.4M
twa44.hea 20-Apr-2008 20:02 518
twa44.qrs 20-Apr-2008 20:02 316
twa45.dat 20-Apr-2008 20:02 234K
twa45.hea 20-Apr-2008 20:02 103
twa45.qrs 20-Apr-2008 20:02 454
twa46.dat 20-Apr-2008 20:02 1.3M
twa46.hea 20-Apr-2008 20:02 509
twa46.qrs 20-Apr-2008 20:02 464
twa47.dat 20-Apr-2008 20:02 1.2M
twa47.hea 20-Apr-2008 20:02 501
twa47.qrs 20-Apr-2008 20:02 570
twa48.dat 20-Apr-2008 20:02 1.3M
twa48.hea 20-Apr-2008 20:02 505
twa48.qrs 20-Apr-2008 20:02 526
twa49.dat 20-Apr-2008 20:02 1.2M
twa49.hea 20-Apr-2008 20:02 507
twa49.qrs 20-Apr-2008 20:02 484
twa50.dat 20-Apr-2008 20:02 1.4M
twa50.hea 20-Apr-2008 20:02 487
twa50.qrs 20-Apr-2008 20:02 510
![[SND]](/icons/sound2.gif)
twa51.dat 20-Apr-2008 20:02 1.5M
twa51.hea 20-Apr-2008 20:02 487
twa51.qrs 20-Apr-2008 20:02 524
twa52.dat 20-Apr-2008 20:02 1.5M
twa52.hea 20-Apr-2008 20:02 485
twa52.qrs 20-Apr-2008 20:02 474
twa53.dat 20-Apr-2008 20:02 1.2M
twa53.hea 20-Apr-2008 20:02 507
twa53.qrs 20-Apr-2008 20:02 578
twa54.dat 20-Apr-2008 20:02 1.3M
twa54.hea 20-Apr-2008 20:02 509
twa54.qrs 20-Apr-2008 20:02 570
twa55.dat 20-Apr-2008 20:02 1.3M
twa55.hea 20-Apr-2008 20:02 503
twa55.qrs 20-Apr-2008 20:02 578
twa56.dat 20-Apr-2008 20:02 1.3M
twa56.hea 20-Apr-2008 20:02 512
twa56.qrs 20-Apr-2008 20:02 352
twa57.dat 20-Apr-2008 20:02 352K
twa57.hea 20-Apr-2008 20:02 146
twa57.qrs 20-Apr-2008 20:02 400
twa58.dat 20-Apr-2008 20:02 1.3M
twa58.hea 20-Apr-2008 20:02 511
twa58.qrs 20-Apr-2008 20:02 460
twa59.dat 20-Apr-2008 20:02 234K
twa59.hea 20-Apr-2008 20:02 107
twa59.qrs 20-Apr-2008 20:02 328
twa60.dat 20-Apr-2008 20:02 1.4M
twa60.hea 20-Apr-2008 20:02 504
twa60.qrs 20-Apr-2008 20:02 482
twa61.dat 20-Apr-2008 20:02 234K
twa61.hea 21-Apr-2008 09:10 106
twa61.qrs 20-Apr-2008 20:02 346
twa62.dat 20-Apr-2008 20:02 234K
twa62.hea 21-Apr-2008 09:12 103
twa62.qrs 20-Apr-2008 20:02 432
twa63.dat 20-Apr-2008 20:02 234K
twa63.hea 20-Apr-2008 20:02 103
twa63.qrs 20-Apr-2008 20:02 346
twa64.dat 20-Apr-2008 20:02 1.4M
twa64.hea 20-Apr-2008 20:02 486
twa64.qrs 20-Apr-2008 20:02 508
twa65.dat 20-Apr-2008 20:02 1.3M
twa65.hea 20-Apr-2008 20:02 507
twa65.qrs 20-Apr-2008 20:02 590
twa66.dat 20-Apr-2008 20:02 1.2M
twa66.hea 20-Apr-2008 20:02 504
twa66.qrs 20-Apr-2008 20:02 472
twa67.dat 20-Apr-2008 20:02 1.4M
twa67.hea 20-Apr-2008 20:02 481
twa67.qrs 20-Apr-2008 20:02 514
twa68.dat 20-Apr-2008 20:02 234K
twa68.hea 20-Apr-2008 20:02 106
twa68.qrs 20-Apr-2008 20:02 290
twa69.dat 20-Apr-2008 20:02 1.4M
twa69.hea 20-Apr-2008 20:02 479
twa69.qrs 21-Apr-2008 09:27 546
twa70.dat 20-Apr-2008 20:02 1.4M
twa70.hea 20-Apr-2008 20:02 483
twa70.qrs 20-Apr-2008 20:02 498
twa71.dat 20-Apr-2008 20:02 234K
twa71.hea 21-Apr-2008 09:12 104
twa71.qrs 20-Apr-2008 20:02 386
twa72.dat 20-Apr-2008 20:02 1.5M
twa72.hea 20-Apr-2008 20:02 481
twa72.qrs 20-Apr-2008 20:02 536
twa73.dat 20-Apr-2008 20:02 1.4M
twa73.hea 20-Apr-2008 20:02 487
twa73.qrs 20-Apr-2008 20:02 500
twa74.dat 20-Apr-2008 20:02 1.3M
twa74.hea 20-Apr-2008 20:02 514
twa74.qrs 20-Apr-2008 20:02 382
twa75.dat 20-Apr-2008 20:02 1.2M
twa75.hea 20-Apr-2008 20:02 513
twa75.qrs 21-Apr-2008 09:33 490
twa76.dat 20-Apr-2008 20:02 1.4M
twa76.hea 20-Apr-2008 20:02 499
twa76.qrs 20-Apr-2008 20:02 504
twa77.dat 20-Apr-2008 20:02 352K
twa77.hea 20-Apr-2008 20:02 141
twa77.qrs 20-Apr-2008 20:02 568
twa78.dat 20-Apr-2008 20:02 1.4M
twa78.hea 20-Apr-2008 20:02 486
twa78.qrs 21-Apr-2008 09:34 586
twa79.dat 20-Apr-2008 20:02 1.5M
twa79.hea 20-Apr-2008 20:02 490
twa79.qrs 21-Apr-2008 09:38 574
twa80.dat 20-Apr-2008 20:02 352K
twa80.hea 20-Apr-2008 20:02 145
twa80.qrs 20-Apr-2008 20:02 372
twa81.dat 20-Apr-2008 20:02 1.4M
twa81.hea 20-Apr-2008 20:02 490
twa81.qrs 20-Apr-2008 20:02 516
twa82.dat 20-Apr-2008 20:02 1.5M
twa82.hea 20-Apr-2008 20:02 496
twa82.qrs 20-Apr-2008 20:02 524
twa83.dat 20-Apr-2008 20:02 1.2M
twa83.hea 20-Apr-2008 20:02 508
twa83.qrs 20-Apr-2008 20:02 466
twa84.dat 20-Apr-2008 20:02 1.4M
twa84.hea 20-Apr-2008 20:02 512
twa84.qrs 20-Apr-2008 20:02 222
twa85.dat 20-Apr-2008 20:02 352K
twa85.hea 20-Apr-2008 20:02 146
twa85.qrs 20-Apr-2008 20:02 418
twa86.dat 20-Apr-2008 20:02 1.4M
twa86.hea 20-Apr-2008 20:02 515
twa86.qrs 20-Apr-2008 20:02 334
twa87.dat 20-Apr-2008 20:02 1.2M
twa87.hea 20-Apr-2008 20:02 514
twa87.qrs 20-Apr-2008 20:02 404
twa88.dat 20-Apr-2008 20:02 1.4M
twa88.hea 20-Apr-2008 20:02 475
twa88.qrs 21-Apr-2008 09:46 556
twa89.dat 20-Apr-2008 20:02 352K
twa89.hea 20-Apr-2008 20:02 141
twa89.qrs 20-Apr-2008 20:02 388
twa90.dat 20-Apr-2008 20:02 1.3M
twa90.hea 20-Apr-2008 20:02 517
twa90.qrs 20-Apr-2008 20:02 522
twa91.dat 20-Apr-2008 20:02 1.4M
twa91.hea 20-Apr-2008 20:02 482
twa91.qrs 21-Apr-2008 09:52 566
twa92.dat 20-Apr-2008 20:02 352K
twa92.hea 20-Apr-2008 20:02 141
twa92.qrs 20-Apr-2008 20:02 444
twa93.dat 20-Apr-2008 20:02 234K
twa93.hea 21-Apr-2008 09:12 107
twa93.qrs 20-Apr-2008 20:02 406
twa94.dat 20-Apr-2008 20:02 1.3M
twa94.hea 20-Apr-2008 20:02 514
twa94.qrs 20-Apr-2008 20:02 512
twa95.dat 20-Apr-2008 20:02 234K
twa95.hea 20-Apr-2008 20:02 106
twa95.qrs 20-Apr-2008 20:02 332
twa96.dat 20-Apr-2008 20:02 1.3M
twa96.hea 20-Apr-2008 20:02 518
twa96.qrs 20-Apr-2008 20:02 316
twa97.dat 20-Apr-2008 20:02 1.4M
twa97.hea 20-Apr-2008 20:02 495
twa97.qrs 21-Apr-2008 09:55 562
twa98.dat 20-Apr-2008 20:02 1.4M
twa98.hea 20-Apr-2008 20:02 493
twa98.qrs 21-Apr-2008 09:56 576
twa99.dat 20-Apr-2008 20:02 1.4M
twa99.hea 20-Apr-2008 20:02 514
twa99.qrs 20-Apr-2008 20:02 488
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