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. 2005 Jan 13;10(1):110–120. doi: 10.1111/j.1542-474X.2005.10103.x

Table 3.

Recommended Measurement Periods for Ambulatory ECG Monitoring of TWA

Measurement Period Rationale
Peak heart rate Enhanced mental and/or physical activity 26 , 50
8 am Circadian period of heightened vulnerability to SCD 50
Peak ST‐segment deviation from baseline Ischemic changes may augment vulnerability to arrhythmia 47
Maximum TWA Ongoing daily life activities may increase arrhythmia vulnerability
Patient‐activated event marker Exploit patients' unique awareness of increased mental and physical stress