Clinical Value of ATP Stress 99mTc-MIBI Gated Myocardial Perfusion Imaging for Evaluating Myocardial Ischemia in Patients With Myocardial Bridge
10.3969/j.issn.1000-3614.2015.05.011
- VernacularTitle:三磷酸腺苷负荷 99m锝—甲氧基异丁基异腈门控心肌灌注显像在评价心肌桥引起心肌缺血患者中的临床价值
- Author:
Pengxiang ZHANG
;
Song CHEN
;
Lijuan WANG
;
Yingxian SUN
;
Yaming LI
- Publication Type:Journal Article
- Keywords:
Myocardial Bridge;
Adenosine triphosphate;
99mTc- methoxyisobutylisonitrile;
Gated myocardial perfusion imaging
- From:
Chinese Circulation Journal
2015;30(5):455-459
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To explore the clinical value of adenosine triphosphate (ATP) stress99mTc-methoxyisobutylisonitrile (99mTc-MIBI) gated myocardial perfusion imaging (G-MPI) for evaluating the severity and region of myocardial ischemia and left ventricular function in patients with myocardial bridge. Methods: A total of 58 patients with CAG or CTA confirmed diagnosis of myocardial bridge received ATP stress99mTc-MIBI G-MPI examination in our hospital. The short and vertical long-axis image of left ventricular myocardium were divided into 13 segments and the radionuclide distribution was semi-quantitatively evaluated into 4 classes by 0-3 scores visually (0: normal, 1: mild reduction, 2: moderate reduction, 3: severe reduction). The summed stress score (SSS) of left ventricular myocardium was calculated, the severity and region of myocardial ischemia were judged and compared with the severity of myocardial bridge. The LVEF obtained by ATP stress 99mTc-MIBI G-MPI was compared with LVEF obtained by cardiac color ultrasound (UCG).Results: The detection rate of myocardial ischemia by ATP Stress 99mTc-MIBI G-MPI and by 24h dynamic ECGwere 82.76% vs 56.10%, P <0.05. ATP Stress 99mTc-MIBI G-MPI presented abnormal radionuclide distribution in258 segments (63.55%) of LAD supplied territory, 82 (47.13%) of LCX supplied territory and 74 (42.53%) of RCAsupplied territory; the ischemic segments in LAD supplied territory were more than those in LCX and RCA suppliedterritories, P <0.0125. The resting LVEF obtained by ATP Stress 99mTc-MIBI G-MPI and by UCG were (69.59 ± 4.13)% vs (63.22 ± 4.12) %, P >0.05 and they had positive correlation (r =0.555, P <0.05).Conclusion: ATP stress 99mTc-MIBI G-MPI could accurately and intuitively evaluate the severity and region ofmyocardial ischemia and left ventricular function in patients with myocardial bridge, it has certain guiding value inclinical practice.
