DM DOC 040 Rev 1.0
ECG Classification
A task force of the American College of Cardiology established a classification system for ECG
abnormalities on the basis of the types of statements that could be made. These are as follows:
Type A
:
An ECG abnormality which can be confirmed by non electrocardiographic means,
e.g ventricular hypertrophy that can be confirmed by echocardiography, or recent
myocardial infarction confirmed by a rise in biomarkers;
Type B
:
An ECG abnormality basically detected by the ECG itself, e.g arrhythmias or
conduction abnormalities such as bundle branch block;
Type C
:
An ECG abnormality that is essentially descriptive, e.g. axis deviation, moderate
ST elevation etc.
Definitions
TRUE POSITIVE (TP) =
A correct report of an abnormality being present
TRUE NEGATIVE (TN) =
A correct report of an abnormality being absent
FALSE POSITIVE (FP) =
An incorrect report of an abnormality being present
FALSE NEGATIVE (FN)
=
An incorrect report of an abnormality being absent
SENSITIVITY (SENS) =
FN
TP
TP
SPECIFICITY (SPEC) =
FP
TN
TN
POSITIVE PREDICTIVE VALUE (PPV)
=
FP
TP
TP
NEGATIVE PREDICTIVE VALUE (NPV)
=
FN
TN
TN
PREVALENCE =
base
data
the
in
cases
of
number
Total
y
abnormalit
an
of
s
occurrence
of
Number
TOTAL ACCURACY =
1220
classified
correctly
cases
of
number
Total
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