normal style
2.Methods 75 effort angina pectoris patients, 47 non-ST-segment elevation myocardial infarction patient and 55 healthy subjects underwent 24 hours Holter monitoring in normal life style . The mean QT intervals (QTm), the standard deviation of QT intervals(QTV), the mean HR intervals (HRm), the standard deviation of HR intervals(HRV), and QT variability index(QTVI) were calculated for every hour during the day and the night .

