Welch Allyn Means ECG Physicians Manual for CP Series Electrocardiographs - User Manual - 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