BACKGROUND:The QT couple dissociation(QTcd) of ECG in patients with chronically coronary
ischemia is much longer than that
in healthy aged people.Some Chinese medical preparation can correct the prolongation. OBJECTIVE:To explore the difference on QTcd of ECG between
coronary ischemia patients and healthy old people and if the difference can be corrected by using self made compound
astragalus root tea. DESIGN:Case controlled study based on diagnosis. SETTING,PARTICIPANTS and INTERVENTIOS:Totally 31 aged people suffering from coronary ischemia were screened from retired staff of Hangzhou Railway Branch Bureau by health examination as ischemic group.Other 33 healthy aged people were chosen as control group.ECG was conducted to both groups to detect QTd.One bag astragalus root tea was used twice per day to people in ischemic group for 4 weeks.Then QTd and hemorheology were detected to this group after intervention. MAIN OUTCOME MEASURES:①Comparison of QTcd between two groups;②Comparison of QTcd before and after drinking astragalus root tea in ischemia group. RESULTS:There is significant difference on QTcd between ischemic group<(46.2±11.1)ms> and normal group<(28.1±9.8 )>(t=6.91,P< 0.01). After intervention of astragalus tea,the QTcd is clearly shortened of ischemic group(t=5.31,P< 0.01).Both whole blood high shear viscosity and low shear viscosity are reduced(t=2.72, 2.66,P< 0.01).The symptoms of coronary ischemia have improved with the effective rate of 90%(28/31).CONCLUSION:The QTcd of coronary ischemia patients is longer than that of normal age people.Drinking astragalus root tea can improve this normal prolongation.