Biomedical Engineering Reference
In-Depth Information
T _ inversion _ l _ d(V 5 )
=
Localized
grd5
:
T _ inversion _ l _ d(II)
=
Localized
T _ inversion _ l _ d(III)
=
Localized
T _ inversion _ l _ d(aVF)
=
Localized
grd7
:
T _ Normal _ Status
=
FA L S E
THEN
act1
:
Disease _ step 8
:=
posterior _ MI
END
The event T_Wave_Assessment_Flat is used to trace Nonspecific ST-T changes
including other several diseases. To identify these diseases, a set of guards is given
that represents the required conditions. These guards state that the state of T-wave
is flat in all leads, the ST elevation is TRUE and the ST segment elevation is greater
than or equal to 1000 µm, or the abnormal shape of ST segment is TRUE in anyone
lead, or the ST elevation is FALSE or the ST segment elevation is less than 1000 µm,
and the abnormal shape of ST segment is FALSE in any two leads, inversion in T-
wave is less than 5000 µm in all leads, and the normal state of T-wave is FALSE.
EVENT T _ Wave _ Assessment _ Flat
WHEN
grd1
:∀
l
·
l
LEADS
T _ Wa v e _ State(l)
=
Flat
grd2
:
((
(ST _ elevation(l) = TRUE ST _ elevation(k) = TRUE)
((ST _ seg _ ele(l) 1000 ST _ seg _ ele(k) 1000 )
(Abnormal _ Shaped _ ST(l) = TRUE Abnormal _ Shaped _ ST(k) = TRUE))
l = k)
( l 1 ,k 1
l,k
·
l
LEADS
k
LEADS
LEADS
((ST _ elevation(l 1 ) = FA L S E ST _ elevation(k 1 ) = FA L S E )
((ST _ seg _ ele(l 1 )< 1000
· l 1
LEADS k 1
ST _ seg _ ele(k 1 )< 1000 )
(Abnormal _ Shaped _ ST(l 1 ) =
FA L S E
Abnormal _ Shaped _ ST(k 1 ) =
FA L S E )))
l 1
= k 1 ))
grd3
:∀
l
·
l
LEADS
T _ inversion(l) < 5000
grd5
:
T _ Normal _ Status
=
FA L S E
THEN
act1
:
Disease _ step 8
:=
Nonspecific _ ST _ T _ changes
act1
:
Disease _ step 8_ B
Cardiomyopathy, Electrolyte _ depletion,
Alcohol, Myocarditis, Other
:∈ {
}
END
The event T_Wave_Assessment_Inverted_Yes presents basic symptoms for as-
sessing the definite ischemia, probable ischemia, and digitalis effect. The guards
of this event state that the state of T-wave is inverted and the ST elevation is TRUE
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