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ST segment
149
ST elevation characterization
The waves recorded on the ECG are identified by the points ranging from P to T, as
shown in figure 1.
The ST segment begins at the point at which the set Q-R-S ends, presenting
upward curve in a normal situation.
The indication of possible acute myocardial infarction is an evident decrease of
the ST segment, represented by the decrease or inversion of the concavity of this
region of the curve (other figures).
ST
T
ST elevation
ST
T
ST depression
ST
T
ST depression
P
Q
R
S
T
Time (1s)
Milivolts 0
1
2
-1
-2
Normal ST segment
(Fig. 1)
