[Association of QT dispersion, ST/heart rate slope and ST-segment depression in exercise test to evaluate restenosis after percutaneous coronary intervention].
OBJECTIVE
To evaluate the sensitivity and specificity of QT dispersion (QTd) and ST/heart rate slope (ST/HRs) at the end of ECG exercise test plus ST-segment depression on diagnosing restenosis after percutaneous coronary intervention (PCI).


METHODS
Between November 2001 and December 2003, 129 patients underwent PCI successfully, and they were examined 3-6 months later. At the end of treadmill exercise, QTd and ST/HRs were measured. All patients also accepted coronary angiography to ascertain whether he/she had restenosis. The results of QTd and ST/HRs plus ST-segment depression were then evaluated.


RESULTS
The sensitivity and specificity of QTd and ST/HRs plus ST-segment depression were 84.6% and 80.4% respectively. Both of them were significantly higher than conventional ST-segment depression standard (sensitivity was 53.3% and specificity was 66.7%, P<0.05).


CONCLUSIONS
Measuring QTd and ST/HRs at the end of ECG treadmill exercise test plus ST-segment depression can be used for the diagnosis of restenosis after PCI.
Hou
Rui-tian
RT
Department of Cardiology, the Affiliated Hospital of Chengde Medical College, Chengde 067000, Hebei, China. hrt65@sohu.com
Hao
Zhi-min
ZM
Ding
Zhen-jiang
ZJ
Jin
Feng-biao
FB
Guo
Dan-jie
DJ
Li
Chun-hua
CH
D000328:Adult; D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D023903:Coronary Restenosis / Q000175:diagnosis*; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D005500:Follow-Up Studies; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis; D012680:Sensitivity and Specificity