Database Open Access

T-Wave Alternans Challenge Database

Published: Sept. 22, 2008. Version: 1.0.0


When using this resource, please cite the original publication:

Moody GB, The PhysioNet / Computers in Cardiology Challenge 2008: T-Wave Alternans. Computers in Cardiology 35:505-508; 2008.

Please include the standard citation for PhysioNet:

Goldberger AL, Amaral LAN, Glass L, Hausdorff JM, Ivanov PCh, Mark RG, Mietus JE, Moody GB, Peng C-K, Stanley HE. PhysioBank, PhysioToolkit, and PhysioNet: Components of a New Research Resource for Complex Physiologic Signals (2003). Circulation. 101(23):e215-e220.

Abstract

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.

Data Description

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.


Share
Access

Access Policy:
Anyone can access the files, as long as they conform to the terms of the specified license.

License (for files):
Open Data Commons Attribution License v1.0

Discovery
Corresponding Author
You must be logged in to view the contact information.

Files on Google Cloud

Click here to view the files in the Google Cloud Console. Login with a Google account is required.

Download Zip from Google

Files

Total uncompressed size: 105.0 MB.Download Zip (105.0 MB)

Visualize waveforms

Folder Navigation: <base>
Name Size Modified
ANNOTATORS 21 B 2008-04-21
RECORDS 600 B 2008-04-20
SHA256SUMS.txt 22.1 KB 2019-02-20
twa00.dat 234.4 KB 2008-04-20
twa00.hea 105 B 2008-04-20
twa00.qrs 308 B 2008-04-20
twa01.dat 1.4 MB 2008-04-20
twa01.hea 477 B 2008-04-20
twa01.qrs 560 B 2008-04-21
twa02.dat 234.4 KB 2008-04-20
twa02.hea 108 B 2008-04-20
twa02.qrs 836 B 2008-04-20
twa03.dat 1.3 MB 2008-04-20
twa03.hea 513 B 2008-04-20
twa03.qrs 688 B 2008-04-20
twa04.dat 351.6 KB 2008-04-20
twa04.hea 145 B 2008-04-20
twa04.qrs 382 B 2008-04-20
twa05.dat 234.4 KB 2008-04-20
twa05.hea 109 B 2008-04-20
twa05.qrs 908 B 2008-04-20
twa06.dat 1.4 MB 2008-04-20
twa06.hea 477 B 2008-04-20
twa06.qrs 496 B 2008-04-20
twa07.dat 351.6 KB 2008-04-20
twa07.hea 145 B 2008-04-20
twa07.qrs 422 B 2008-04-20
twa08.dat 234.4 KB 2008-04-20
twa08.hea 107 B 2008-04-20
twa08.qrs 420 B 2008-04-20
twa09.dat 1.5 MB 2008-04-20
twa09.hea 486 B 2008-04-20
twa09.qrs 532 B 2008-04-20
twa10.dat 234.4 KB 2008-04-20
twa10.hea 108 B 2008-04-21
twa10.qrs 260 B 2008-04-20
twa11.dat 1.3 MB 2008-04-20
twa11.hea 510 B 2008-04-20
twa11.qrs 540 B 2008-04-20
twa12.dat 1.3 MB 2008-04-20
twa12.hea 507 B 2008-04-20
twa12.qrs 398 B 2008-04-20
twa13.dat 1.5 MB 2008-04-20
twa13.hea 481 B 2008-04-20
twa13.qrs 522 B 2008-04-20
twa14.dat 351.6 KB 2008-04-20
twa14.hea 144 B 2008-04-20
twa14.qrs 564 B 2008-04-20
twa15.dat 1.4 MB 2008-04-20
twa15.hea 491 B 2008-04-20
twa15.qrs 556 B 2008-04-21
twa16.dat 1.4 MB 2008-04-20
twa16.hea 517 B 2008-04-20
twa16.qrs 532 B 2008-04-21
twa17.dat 1.4 MB 2008-04-20
twa17.hea 481 B 2008-04-20
twa17.qrs 582 B 2008-04-21
twa18.dat 1.3 MB 2008-04-20
twa18.hea 500 B 2008-04-20
twa18.qrs 580 B 2008-04-20
twa19.dat 1.3 MB 2008-04-20
twa19.hea 507 B 2008-04-20
twa19.qrs 462 B 2008-04-20
twa20.dat 1.3 MB 2008-04-20
twa20.hea 509 B 2008-04-20
twa20.qrs 526 B 2008-04-20
twa21.dat 1.4 MB 2008-04-20
twa21.hea 478 B 2008-04-20
twa21.qrs 508 B 2008-04-20
twa22.dat 234.4 KB 2008-04-20
twa22.hea 106 B 2008-04-20
twa22.qrs 260 B 2008-04-20
twa23.dat 234.4 KB 2008-04-20
twa23.hea 105 B 2008-04-21
twa23.qrs 556 B 2008-04-20
twa24.dat 1.4 MB 2008-04-21
twa24.hea 516 B 2008-04-21
twa24.qrs 338 B 2008-04-21
twa25.dat 1.4 MB 2008-04-20
twa25.hea 506 B 2008-04-20
twa25.qrs 492 B 2008-04-20
twa26.dat 1.4 MB 2008-04-20
twa26.hea 526 B 2008-04-20
twa26.qrs 334 B 2008-04-20
twa27.dat 1.3 MB 2008-04-20
twa27.hea 522 B 2008-04-20
twa27.qrs 386 B 2008-04-20
twa28.dat 1.4 MB 2008-04-20
twa28.hea 478 B 2008-04-20
twa28.qrs 552 B 2008-04-21
twa29.dat 1.5 MB 2008-04-20
twa29.hea 482 B 2008-04-20
twa29.qrs 604 B 2008-04-21
twa30.dat 1.5 MB 2008-04-20
twa30.hea 494 B 2008-04-20
twa30.qrs 534 B 2008-04-20
twa31.dat 1.2 MB 2008-04-20
twa31.hea 506 B 2008-04-20
twa31.qrs 568 B 2008-04-20
twa32.dat 351.6 KB 2008-04-20
twa32.hea 143 B 2008-04-20
twa32.qrs 664 B 2008-04-20
twa33.dat 1.4 MB 2008-04-20
twa33.hea 484 B 2008-04-20
twa33.qrs 604 B 2008-04-21
twa34.dat 1.4 MB 2008-04-20
twa34.hea 483 B 2008-04-20
twa34.qrs 512 B 2008-04-20
twa35.dat 1.5 MB 2008-04-20
twa35.hea 482 B 2008-04-20
twa35.qrs 534 B 2008-04-20
twa36.dat 1.3 MB 2008-04-20
twa36.hea 497 B 2008-04-20
twa36.qrs 590 B 2008-04-20
twa37.dat 351.6 KB 2008-04-20
twa37.hea 146 B 2008-04-20
twa37.qrs 406 B 2008-04-20
twa38.dat 1.3 MB 2008-04-20
twa38.hea 508 B 2008-04-20
twa38.qrs 364 B 2008-04-20
twa39.dat 1.4 MB 2008-04-20
twa39.hea 518 B 2008-04-20
twa39.qrs 650 B 2008-04-20
twa40.dat 1.2 MB 2008-04-20
twa40.hea 516 B 2008-04-20
twa40.qrs 472 B 2008-04-20
twa41.dat 1.2 MB 2008-04-20
twa41.hea 508 B 2008-04-20
twa41.qrs 436 B 2008-04-20
twa42.dat 1.2 MB 2008-04-20
twa42.hea 506 B 2008-04-20
twa42.qrs 480 B 2008-04-20
twa43.dat 351.6 KB 2008-04-20
twa43.hea 144 B 2008-04-20
twa43.qrs 342 B 2008-04-20
twa44.dat 1.4 MB 2008-04-20
twa44.hea 518 B 2008-04-20
twa44.qrs 316 B 2008-04-20
twa45.dat 234.4 KB 2008-04-20
twa45.hea 103 B 2008-04-20
twa45.qrs 454 B 2008-04-20
twa46.dat 1.3 MB 2008-04-20
twa46.hea 509 B 2008-04-20
twa46.qrs 464 B 2008-04-20
twa47.dat 1.2 MB 2008-04-20
twa47.hea 501 B 2008-04-20
twa47.qrs 570 B 2008-04-20
twa48.dat 1.3 MB 2008-04-20
twa48.hea 505 B 2008-04-20
twa48.qrs 526 B 2008-04-20
twa49.dat 1.2 MB 2008-04-20
twa49.hea 507 B 2008-04-20
twa49.qrs 484 B 2008-04-20
twa50.dat 1.4 MB 2008-04-20
twa50.hea 487 B 2008-04-20
twa50.qrs 510 B 2008-04-20
twa51.dat 1.5 MB 2008-04-20
twa51.hea 487 B 2008-04-20
twa51.qrs 524 B 2008-04-20
twa52.dat 1.5 MB 2008-04-20
twa52.hea 485 B 2008-04-20
twa52.qrs 474 B 2008-04-20
twa53.dat 1.2 MB 2008-04-20
twa53.hea 507 B 2008-04-20
twa53.qrs 578 B 2008-04-20
twa54.dat 1.3 MB 2008-04-20
twa54.hea 509 B 2008-04-20
twa54.qrs 570 B 2008-04-20
twa55.dat 1.3 MB 2008-04-20
twa55.hea 503 B 2008-04-20
twa55.qrs 578 B 2008-04-20
twa56.dat 1.3 MB 2008-04-20
twa56.hea 512 B 2008-04-20
twa56.qrs 352 B 2008-04-20
twa57.dat 351.6 KB 2008-04-20
twa57.hea 146 B 2008-04-20
twa57.qrs 400 B 2008-04-20
twa58.dat 1.3 MB 2008-04-20
twa58.hea 511 B 2008-04-20
twa58.qrs 460 B 2008-04-20
twa59.dat 234.4 KB 2008-04-20
twa59.hea 107 B 2008-04-20
twa59.qrs 328 B 2008-04-20
twa60.dat 1.4 MB 2008-04-20
twa60.hea 504 B 2008-04-20
twa60.qrs 482 B 2008-04-20
twa61.dat 234.4 KB 2008-04-20
twa61.hea 106 B 2008-04-21
twa61.qrs 346 B 2008-04-20
twa62.dat 234.4 KB 2008-04-20
twa62.hea 103 B 2008-04-21
twa62.qrs 432 B 2008-04-20
twa63.dat 234.4 KB 2008-04-20
twa63.hea 103 B 2008-04-20
twa63.qrs 346 B 2008-04-20
twa64.dat 1.4 MB 2008-04-20
twa64.hea 486 B 2008-04-20
twa64.qrs 508 B 2008-04-20
twa65.dat 1.3 MB 2008-04-20
twa65.hea 507 B 2008-04-20
twa65.qrs 590 B 2008-04-20
twa66.dat 1.2 MB 2008-04-20
twa66.hea 504 B 2008-04-20
twa66.qrs 472 B 2008-04-20
twa67.dat 1.4 MB 2008-04-20
twa67.hea 481 B 2008-04-20
twa67.qrs 514 B 2008-04-20
twa68.dat 234.4 KB 2008-04-20
twa68.hea 106 B 2008-04-20
twa68.qrs 290 B 2008-04-20
twa69.dat 1.4 MB 2008-04-20
twa69.hea 479 B 2008-04-20
twa69.qrs 546 B 2008-04-21
twa70.dat 1.4 MB 2008-04-20
twa70.hea 483 B 2008-04-20
twa70.qrs 498 B 2008-04-20
twa71.dat 234.4 KB 2008-04-20
twa71.hea 104 B 2008-04-21
twa71.qrs 386 B 2008-04-20
twa72.dat 1.5 MB 2008-04-20
twa72.hea 481 B 2008-04-20
twa72.qrs 536 B 2008-04-20
twa73.dat 1.4 MB 2008-04-20
twa73.hea 487 B 2008-04-20
twa73.qrs 500 B 2008-04-20
twa74.dat 1.3 MB 2008-04-20
twa74.hea 514 B 2008-04-20
twa74.qrs 382 B 2008-04-20
twa75.dat 1.2 MB 2008-04-20
twa75.hea 513 B 2008-04-20
twa75.qrs 490 B 2008-04-21
twa76.dat 1.4 MB 2008-04-20
twa76.hea 499 B 2008-04-20
twa76.qrs 504 B 2008-04-20
twa77.dat 351.6 KB 2008-04-20
twa77.hea 141 B 2008-04-20
twa77.qrs 568 B 2008-04-20
twa78.dat 1.4 MB 2008-04-20
twa78.hea 486 B 2008-04-20
twa78.qrs 586 B 2008-04-21
twa79.dat 1.5 MB 2008-04-20
twa79.hea 490 B 2008-04-20
twa79.qrs 574 B 2008-04-21
twa80.dat 351.6 KB 2008-04-20
twa80.hea 145 B 2008-04-20
twa80.qrs 372 B 2008-04-20
twa81.dat 1.4 MB 2008-04-20
twa81.hea 490 B 2008-04-20
twa81.qrs 516 B 2008-04-20
twa82.dat 1.5 MB 2008-04-20
twa82.hea 496 B 2008-04-20
twa82.qrs 524 B 2008-04-20
twa83.dat 1.2 MB 2008-04-20
twa83.hea 508 B 2008-04-20
twa83.qrs 466 B 2008-04-20
twa84.dat 1.4 MB 2008-04-20
twa84.hea 512 B 2008-04-20
twa84.qrs 222 B 2008-04-20
twa85.dat 351.6 KB 2008-04-20
twa85.hea 146 B 2008-04-20
twa85.qrs 418 B 2008-04-20
twa86.dat 1.4 MB 2008-04-20
twa86.hea 515 B 2008-04-20
twa86.qrs 334 B 2008-04-20
twa87.dat 1.2 MB 2008-04-20
twa87.hea 514 B 2008-04-20
twa87.qrs 404 B 2008-04-20
twa88.dat 1.4 MB 2008-04-20
twa88.hea 475 B 2008-04-20
twa88.qrs 556 B 2008-04-21
twa89.dat 351.6 KB 2008-04-20
twa89.hea 141 B 2008-04-20
twa89.qrs 388 B 2008-04-20
twa90.dat 1.3 MB 2008-04-20
twa90.hea 517 B 2008-04-20
twa90.qrs 522 B 2008-04-20
twa91.dat 1.4 MB 2008-04-20
twa91.hea 482 B 2008-04-20
twa91.qrs 566 B 2008-04-21
twa92.dat 351.6 KB 2008-04-20
twa92.hea 141 B 2008-04-20
twa92.qrs 444 B 2008-04-20
twa93.dat 234.4 KB 2008-04-20
twa93.hea 107 B 2008-04-21
twa93.qrs 406 B 2008-04-20
twa94.dat 1.3 MB 2008-04-20
twa94.hea 514 B 2008-04-20
twa94.qrs 512 B 2008-04-20
twa95.dat 234.4 KB 2008-04-20
twa95.hea 106 B 2008-04-20
twa95.qrs 332 B 2008-04-20
twa96.dat 1.3 MB 2008-04-20
twa96.hea 518 B 2008-04-20
twa96.qrs 316 B 2008-04-20
twa97.dat 1.4 MB 2008-04-20
twa97.hea 495 B 2008-04-20
twa97.qrs 562 B 2008-04-21
twa98.dat 1.4 MB 2008-04-20
twa98.hea 493 B 2008-04-20
twa98.qrs 576 B 2008-04-21
twa99.dat 1.4 MB 2008-04-20
twa99.hea 514 B 2008-04-20
twa99.qrs 488 B 2008-04-20