About Dataset

Title: Cardiac Arrhythmia Database

Sources:

(a) Original owners od Database:
-- 1. H. Altay Guvenir, PhD.,
Bilkent University,
Department of Computer Engineering and Information Science,
06533 Ankara, Turkey
Phone: +90 (312) 266 4133
Email: guvenir@cs.bilkent.edu.tr

-- 2. Burak Acar, M.S.,
Bilkent University,
EE Eng. Dept.
06533 Ankara, Turkey
Email: buraka@ee.bilkent.edu.tr

-- 2. Haldun Muderrisoglu, M.D., Ph.D.,
Baskent University,
School of Medicine
Ankara, Turkey

(b) Donor: H. Altay Guvenir
Bilkent University,
Department of Computer Engineering and Information Science,
06533 Ankara, Turkey
Phone: +90 (312) 266 4133
Email: guvenir@cs.bilkent.edu.tr

(c) Date: January, 1998

Past Usage:

H. Altay Guvenir, Burak Acar, Gulsen Demiroz, Ayhan Cekin
"A Supervised Machine Learning Algorithm for Arrhythmia Analysis"
Proceedings of the Computers in Cardiology Conference,
Lund, Sweden, 1997.

The aim is to determine the type of arrhythmia from
the ECG recordings.

Relevant Information:
This database contains 279 attributes, 206 of which are linear
valued and the rest are nominal.

Concerning the study of H. Altay Guvenir: "The aim is to distinguish
between the presence and absence of cardiac arrhythmia and to
classify it in one of the 16 groups. Class 01 refers to 'normal'
ECG classes 02 to 15 refers to different classes of arrhythmia
and class 16 refers to the rest of unclassified ones. For the
time being, there exists a computer program that makes such a
classification. However there are differences between the
cardiolog's and the programs classification. Taking the
cardiolog's as a gold standard we aim to minimise this difference
by means of machine learning tools."

The names and id numbers of the patients were recently
removed from the database.

Number of Instances: 452

Number of Attributes: 279

Attribute Information:
-- Complete attribute documentation:
1 Age: Age in years , linear
2 Sex: Sex (0 = male; 1 = female) , nominal
3 Height: Height in centimeters , linear
4 Weight: Weight in kilograms , linear
5 QRS duration: Average of QRS duration in msec., linear
6 P-R interval: Average duration between onset of P and Q waves
in msec., linear
7 Q-T interval: Average duration between onset of Q and offset
of T waves in msec., linear
8 T interval: Average duration of T wave in msec., linear
9 P interval: Average duration of P wave in msec., linear
Vector angles in degrees on front plane of:, linear
10 QRS
11 T
12 P
13 QRST
14 J

15 Heart rate: Number of heart beats per minute ,linear

Of channel DI:
Average width, in msec., of: linear
16 Q wave
17 R wave
18 S wave
19 R' wave, small peak just after R
20 S' wave

21 Number of intrinsic deflections, linear

22 Existence of ragged R wave, nominal
23 Existence of diphasic derivation of R wave, nominal
24 Existence of ragged P wave, nominal
25 Existence of diphasic derivation of P wave, nominal
26 Existence of ragged T wave, nominal
27 Existence of diphasic derivation of T wave, nominal

Of channel DII:
28 .. 39 (similar to 16 .. 27 of channel DI)
Of channels DIII:
40 .. 51
Of channel AVR:
52 .. 63
Of channel AVL:
64 .. 75
Of channel AVF:
76 .. 87
Of channel V1:
88 .. 99
Of channel V2:
100 .. 111
Of channel V3:
112 .. 123
Of channel V4:
124 .. 135
Of channel V5:
136 .. 147
Of channel V6:
148 .. 159

Of channel DI:
Amplitude , * 0.1 milivolt, of
160 JJ wave, linear
161 Q wave, linear
162 R wave, linear
163 S wave, linear
164 R' wave, linear
165 S' wave, linear
166 P wave, linear
167 T wave, linear

168 QRSA , Sum of areas of all segments divided by 10,
( Area= width * height / 2 ), linear
169 QRSTA = QRSA + 0.5 * width of T wave * 0.1 * height of T
wave. (If T is diphasic then the bigger segment is
considered), linear

Of channel DII:
170 .. 179
Of channel DIII:
180 .. 189
Of channel AVR:
190 .. 199
Of channel AVL:
200 .. 209
Of channel AVF:
210 .. 219
Of channel V1:
220 .. 229
Of channel V2:
230 .. 239
Of channel V3:
240 .. 249
Of channel V4:
250 .. 259
Of channel V5:
260 .. 269
Of channel V6:
270 .. 279

Missing Attribute Values: Several. Distinguished with '?'.

Class Distribution:
Database: Arrhythmia

Class code : Class : Number of instances:
01 Normal 245
02 Ischemic changes (Coronary Artery Disease) 44
03 Old Anterior Myocardial Infarction 15
04 Old Inferior Myocardial Infarction 15
05 Sinus tachycardy 13
06 Sinus bradycardy 25
07 Ventricular Premature Contraction (PVC) 3
08 Supraventricular Premature Contraction 2
09 Left bundle branch block 9
10 Right bundle branch block 50
11 1. degree AtrioVentricular block 0
12 2. degree AV block 0
13 3. degree AV block 0
14 Left ventricule hypertrophy 4
15 Atrial Fibrillation or Flutter 5
16 Others 22