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Other forms of PVCs and other ECG criteria, as listed in Table 19.1, are also significant, but are not defined or discussed in this laboratory manual.

Note that in leads Ⅱ,Ⅲ, and aVF, a significant amount of ST segment depression (1.8-4.2 mm) was observed, and because of this, the exercise test was terminated.

ST segment depression of 2 mm or more, because it is assumed to be due to myocardial ischemia, is frequently used as an end point to exercise due to the threat of developing an abnormal heartbeat.

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