Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual User Manual
Page 61
MEANS Physicians Manual
Welch Allyn
61
Results
Waveform recognition
Table 1. Interval measurements on biological
ECG
s - mean differences and standard
deviations for global durations and intervals. Collected in conformity with the procedure used
in the CSE study [2].
Global measurement
Calculated mean difference
(ms)
Calculated standard
deviation (ms)
Comments
P-duration
3.2
9.9
PQ-interval
1.0
8.2
QRS-duration
3.1
9.4
QT-interval
3.2
12.0
Table 2. Accuracy of diagnostic interpretative statements on the CSE contour diagnostic
database vs. clinical truth
Diagnostic
Category
No. of
ECG
s
tested
Sensitivity;
%
Specificity:
%
Positive predictive
value %
Comments
Normal
381
96.6
72.7
61.9
LVH
181
59.7
97.8
82.9
RVH
52
20.2
100.0
100.0
BVH
51
32.4
100.0
100.0
AMI
170
77.9
97.3
82.3
IMI
273
63.9
98.5
92.3
MIX
73
62.0
99.7
93.8
VH+MI
31
50.0
100.0
100.0
HYPER
N/A
49.3
98.3
89.0
MI
N/A
68.7
94.3
90.8