EMC
VI-12
VI.2 ST Segment and Amplitude Measurement
ST segment (Figure 4) shows the ST onset as used in the diagnosis of ST elevation myocardial infarction. However,
measurements are also made at equal intervals throughout the ST segment.
Figure 4 ST segment
P and T waves
A search for the P wave is made in the interval preceding the QRS complex. P wave amplitude is determined with
respect to the same baseline as for Q, R, S amplitudes, namely the QRS onset. The global T end is derived in a similar
fashion to the global QRS offset. The ST and T wave amplitudes, are also measured with respect to QRS onset. See
the Figure 5 below:
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