Since 1975, our laboratories at Boston's Beth Israel Hospital (now the Beth Israel Deaconess Medical Center) and at MIT have supported our own research into arrhythmia analysis and related subjects. One of the first major products of that effort was the MIT-BIH Arrhythmia Database, which we completed and began distributing in 1980. The database was the first generally available set of standard test material for evaluation of arrhythmia detectors, and has been used for that purpose as well as for basic research into cardiac dynamics at more than 500 sites worldwide. Originally, we distributed the database on 9-track half-inch digital tape at 800 and 1600 bpi, and on quarter-inch IRIG-format FM analog tape. In August, 1989, we produced a CD-ROM version of the database.

The MIT-BIH Arrhythmia Database contains 48 half-hour excerpts of two-channel ambulatory ECG recordings, obtained from 47 subjects studied by the BIH Arrhythmia Laboratory between 1975 and 1979. Twenty-three recordings were chosen at random from a set of 4000 24-hour ambulatory ECG recordings collected from a mixed population of inpatients (about 60%) and outpatients (about 40%) at Boston's Beth Israel Hospital; the remaining 25 recordings were selected from the same set to include less common but clinically significant arrhythmias that would not be well-represented in a small random sample.

The recordings were digitized at 360 samples per second per channel with 11-bit resolution over a 10 mV range. Two or more cardiologists independently annotated each record; disagreements were resolved to obtain the computer-readable reference annotations for each beat (approximately 110,000 annotations in all) included with the database.

This directory contains the entire MIT-BIH Arrhythmia Database. About half (25 of 48 complete records, and reference annotation files for all 48 records) of this database has been freely available here since PhysioNet's inception in September 1999. The 23 remaining signal files, which had been available only on the MIT-BIH Arrhythmia Database CD-ROM, were posted here in February 2005.

Much more information about this database may be found in the MIT-BIH Arrhythmia Database Directory.

The following files may be downloaded from this site:

Signals Header
100.atr 100.dat 100.hea
101.atr 101.dat 101.hea
102.atr 102.dat 102.hea
103.atr 103.dat 103.hea
104.atr 104.dat 104.hea
105.atr 105.dat 105.hea
106.atr 106.dat 106.hea
107.atr 107.dat 107.hea
108.atr 108.dat 108.hea
109.atr 109.dat 109.hea
111.atr 111.dat 111.hea
112.atr 112.dat 112.hea
113.atr 113.dat 113.hea
114.atr 114.dat 114.hea
115.atr 115.dat 115.hea
116.atr 116.dat 116.hea
117.atr 117.dat 117.hea
118.atr 118.dat 118.hea
119.atr 119.dat 119.hea
121.atr 121.dat 121.hea
122.atr 122.dat 122.hea
123.atr 123.dat 123.hea
124.atr 124.dat 124.hea
200.atr 200.dat 200.hea
201.atr 201.dat 201.hea
202.atr 202.dat 202.hea
203.atr 203.dat 203.hea
205.atr 205.dat 205.hea
207.atr 207.dat 207.hea
208.atr 208.dat 208.hea
209.atr 209.dat 209.hea
210.atr 210.dat 210.hea
212.atr 212.dat 212.hea
213.atr 213.dat 213.hea
214.atr 214.dat 214.hea
215.atr 215.dat 215.hea
217.atr 217.dat 217.hea
219.atr 219.dat 219.hea
220.atr 220.dat 220.hea
221.atr 221.dat 221.hea
222.atr 222.dat 222.hea
223.atr 223.dat 223.hea
228.atr 228.dat 228.hea
230.atr 230.dat 230.hea
231.atr 231.dat 231.hea
232.atr 232.dat 232.hea
233.atr 233.dat 233.hea
234.atr 234.dat 234.hea