Comments
Records s20271, s20272, s20273 and s20274 are from the same patient.
This is the first record.
Lead 0:
This record shows multiple episodes of ischemia which
typically show T-wave peaking followed by significant
ST depression. Some episodes trigger the ischemic
episode definition during the ST elevation, while
others trigger only at the onset of ST-depression.
In still other cases there is a short interval of
"near-baseline" ST between the elevations (peaking
of Ts) and depressions which causes a double counting
of the biphasic episode as two separate episodes.
This occurs at: 6:41:32, 16:48:58, 18:33:00,
21:21:48, 21:36:10 and 23:36:22.
Physiologically each of these represents a single
episode of ischemia. At 15:18:52, there is a short
axis shift which interrupts the terminal portion of
an ischemic episode, resulting in artifactual early
termination of the ischemic episode, and the definition
of a second episode.
Lead 1:
At approximately 6:41:36 the terminal portion of the
ischemic episode is split into additional episodes -
but all represent the resolution phase of the ischemic
episode. T wave peaks, T-wave peaking decreases, and
finally ST depression resolve.
At 7:21:20, double positive peak in ST trend at beginning
of this episode is created by the superposition of
rate-related ST-depression. At 15:18:52, see note above
for lead 0. At the end of this record the data has a
number of episodes labeled as "rate-related".
At 16:52:48, axis shift annotation set between the end
of ischemic episode and local reference.
Electrode locations were not recorded.