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. Author manuscript; available in PMC: 2008 Nov 1.
Published in final edited form as: J Electrocardiol. 2007;40(6 Suppl):S179–S186. doi: 10.1016/j.jelectrocard.2007.06.015

Figure 3.

Figure 3

Electrocardiographic changes during positional tests (Row 1-4) and cardiac ischemia (Row 5-8) in a 74-year old female with transient ischemic events: QRS area in lead V3 (1st row), QRS area in lead V6 (2nd row), ST-amplitude in lead V6 (3rd row), ST-slope in lead V6 (4th row). ECG data in the same channels during an ischemic event is shown in rows 4-8. Note that ST-segment depression in lead V6 was sub-threshold for approximately 15 min (<.1mV), before becoming super-threshold during the last 5 min (>.1mV). The time series ends at the time of maximum ST-depression.