Biomedical Engineering Reference
In-Depth Information
Table 2.2 S
e
and P+ figures for ptb-db using differential ECG
Patient file ID and record No.
in Physionet
Lead I
Lead II
Lead III
Lead
aVR
Lead V1
Lead V3
S
e
P+ S
e
P+ S
e
P+ S
e
P+ S
e
P+ S
e
P+
P245/s0480 (N) 100 100 100 100 100 100 100 100 100 100 100 100
P248/s0481 (N) 100 100 100 100 100 100 100 100 100 100 100 100
P249/s0484 (M) 100 100 100 100 100 100 100 100 100 100 100 100
P092/s0354 (MI-Inf) 100 100 100 100 100 100 100 100 80.1 87.2 100 100
P092/s0358(MI-Inf) 100 100 100 100 100 100 100 100 100 100 100 100
P093/s0378 (MI-Inf) 100 100 100 100 100 100 100 100 100 100 100 100
P002/0015(MI-Ant) 100 100 100 100 100 100 100 100 100 100 80.7 85
P056/0196 (MI-Ant) 100 100 94.8 100 100 85 100 100 100 100 75 75
P262/s0498 (C) 100 100 100 100 100 100 100 100 100 100 100 100
P287/s0548 (Inf-post-lat)) 100 100 100 100 100 100 100 100 100 100 100 100
Narration N Normal; M Myocarditis; MI Myocardial infarction; Ant Anterior; Inf Inferior;
C Cardiomyopathy; Inf-post-lat Inferio posterio lateral
Table 2.3 S
e
and P+ figures
for mit-db using differential
ECG
Patient ID and lead number from Physionet
S
e
P+
100 (v5)
100
100
101 (v1)
98.53
100
102 (v2)
100
100
103 (v2)
100
100
107 (v2)
100
100
112 (v1)
100
100
113 (v1)
98.11
100
114 (ML-II)
100
100
peaks, the slope reversal would not take place, and so, the sample within the
window having lowest magnitude is taken as the QRS peak.
Condition (4) eliminates the possibility of misdetection of P or T peak as R
peak. For ECG data with QS peaks, this would locate the QS region. The algorithm
steps are given in the end of the chapter Appendix 1. Some test results using
PhysioNet data the method is shown in Tables
2.2
and
2.3
. Figure
2.6
a and b
shows R-peak detection, baseline modulation correction using ptb-db and mit-db
data respectively.
2.4.1.2 Using Square Derivative with Amplitude Threshold Criteria
The approach is primarily aimed to reveal the sharp slope changes in the QRS
region of the ECG data. Since the slope changes can have positive as well as
negative values, at first, the sample array is squared to enhance the QRS regions
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