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心肌灌注显像已经广泛用于冠心病的预测与危险度分层、心肌缺血诊断以及疗效的评价[1]。有研究显示糖尿病患者负荷门控心肌灌注断层显像较其他方法有更高的灵敏度和特异度,并较单独依赖病史或病史结合运动耐量试验能提供更多的预后信息。本研究旨在评价99Tcm-MIBI门控心肌灌注显像在2型糖尿病无症状心肌缺血患者中的价值。
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两组共134例受试者均接受了运动负荷+静息门控心肌灌注显像。负荷状态下,2型糖尿病组共有49例(59.04%)患者的114个心肌节段显示放射性分布稀疏或缺损;静息状态下灌注显像显示上述节段中有71个节段放射性分布完全填充,为可逆性缺血,有37个节段显示放射性分布部分填充,为部分可逆性缺血,有6个缺损节段未见明显放射性摄取,为不可逆性缺血。对照组共有9例(17.65%)受检者的12个心肌节段在负荷状态下显示为放射性分布稀疏,对照组左心室壁未出现固定性缺损节段;静息状态下上述节段放射性分布均部分或完全填充,为可逆性缺血。两组受检者血流灌注异常节段之间的差异具有统计学意义(χ2=24.19,P < 0.05)。
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心肌灌注QPS定量评分结果见表 1,2型糖尿病组与对照组的SSS与SRS差异都具有统计学意义(t=7.13、3.15,P < 0.05);两组的SDS比较差异无统计学意义(t=1.44,P > 0.05)。对照组的SSS与SRS比较差异无统计学意义(t=1.795,P > 0.05)。
组别 例数 负荷总积分 静息总积分 积分差 2型糖尿病组 83 4.59±2.34 2.87±1.40 2.87±1.96 对照组 51 2.04±0.81 1.13±0.84 1.08±0.47 t值 7.13 3.15 1.44 P值 0.00 0.01 0.24 表 1 2型糖尿病组患者和健康体检者负荷门控心肌灌注显像量化灌注SPECT评分结果(x±s)
Table 1. diabetes and healthy physical examination patients′ stress gated myocardial perfusion imaging quanti- tative perfusion SPECT result(x±s)
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负荷门控心肌灌注显像QGS左心室心功能定量分析结果见表 2,次极量运动负荷后,2型糖尿病组LVEF与对照组比较差异有统计学意义(t= -7.65,P < 0.05)。两组的高峰充盈率(t=-1.67,P > 0.05)及高峰射血率(t=-1.05,P > 0.05)比较差异无统计学意义。
组别 例数 左心室射血
分数(%)高峰充盈率
(EDV/s)高峰射血率
(EDV/s)2型糖尿病组 83 58.69±6.49 2.50±0.47 2.82±0.35 对照组 51 68.82±7.98 2.79±0.29 2.96±0.19 t值 -7.65 -1.67 -1.05 P值 0.00 0.12 0.31 注:表中,EDV:舒张末期容积遥。 表 2 2型糖尿病组患者和健康体检者负荷门控左心室功能参数分析(x±s)
Table 2. Type 2 diabetes and healthy physical examination patients′ left ventricular functional parameter result(x±s)
99Tcm-MIBI门控心肌灌注显像在2型糖尿病无症状心肌缺血患者中的价值
Significance of 99Tcm-MIBI gated myocardial perfusion imaging in patients with type 2 diabetes but without myocardial ischemia symptoms
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摘要:
目的 探讨门控心肌灌注显像应用于2型糖尿病无症状心肌缺血患者中的价值。 方法 以83例经确诊的2型糖尿病并接受了门控负荷心肌灌注显像的患者作为2型糖尿病组, 51名无糖尿病史及明确的心血管病史的受检者作为对照组。17节段法分析两组受检者的负荷及静息心肌灌注显像, 由两位有经验的医师进行视觉分析结合5点评分法评估左心室缺血节段, 对比软件自动评分法计算两组的负荷总积分、静息总积分和积分差值, 并作统计分析。 结果 两组受检者左心室均未出现固定性心肌灌注缺损节段; 血流灌注异常节段的差异具有统计学意义(χ2=24.19, P < 0.05)。2型糖尿病组与对照组的负荷总积分和静息总积分之间的差异都具有统计学意义(t=7.13、3.15, P均 < 0.05);两组的积分差值比较差异无统计学意义(t=1.44, P > 0.05)。对照组的负荷总积分与静息总积分比较差异无统计学意义(t=1.795, P > 0.05);运动负荷后两组受检者左室射血分数的差异有统计学意义(t=-7.65, P < 0.05)。 结论 门控负荷心肌灌注显像在2型糖尿病人群中的恰当利用对评估无症状心肌缺血是有价值的。 -
关键词:
- 糖尿病 /
- 2型 /
- 心肌缺血 /
- 门控心肌灌注显像 /
- 99m锝甲氧基异丁基异腈
Abstract:Objective To explore the significance of 99Tcm-MIBI gated myocardial perfusion imaging in patients with type 2 diabetes but without myocardial ischemia symptoms. Methods Eighty-three patients with confirmed type 2 diabetes represented the test group and underwent 99Tcm-MIBI gated myocardial perfusion imaging; 51 patients with neither type 2 diabetes nor history of cardiovascular diseases represented the control group and underwent the same examination. Each image of the left-ventricle myocardium was divided into 17 segments for semi-quantitative analysis. All the segments were evaluated in consensus by two experienced doctors. Results were scored using a five-point scoring system and then referred to the system software's auto-scores. The summed stress score(SSS), summed rest score(SRS), summed difference score(SDS), left ventricular ejection fraction (LVEF), peak perfusion rate, and peak ejection rate were determined during both stress imaging and rest imaging. Results Nonreversible defects were not observed in the segments obtained from the two groups. However, the difference between the abnormal perfusion segments of the two groups was significant(χ2=24.19, P < 0.05); the difference between the SSS and SRS(t=7.13, 3.15, P < 0.05) of the two groups was also significant, but no difference was noted in the SDS(t=1.44, P > 0.05) of both groups. Moreover, no significant difference existed between the SSS and SRS in the control group(t=1.795, P > 0.05). By contrast, the difference in the post-stress LVEF between the two groups was significant(t=-7.65, P < 0.05). Conclusions Even without cardiac symptoms, patients with type 2 diabetes should undergo 99Tcm-MIBI gated myocardial perfusion imaging for further analysis. -
表 1 2型糖尿病组患者和健康体检者负荷门控心肌灌注显像量化灌注SPECT评分结果(x±s)
Table 1. diabetes and healthy physical examination patients′ stress gated myocardial perfusion imaging quanti- tative perfusion SPECT result(x±s)
组别 例数 负荷总积分 静息总积分 积分差 2型糖尿病组 83 4.59±2.34 2.87±1.40 2.87±1.96 对照组 51 2.04±0.81 1.13±0.84 1.08±0.47 t值 7.13 3.15 1.44 P值 0.00 0.01 0.24 表 2 2型糖尿病组患者和健康体检者负荷门控左心室功能参数分析(x±s)
Table 2. Type 2 diabetes and healthy physical examination patients′ left ventricular functional parameter result(x±s)
组别 例数 左心室射血
分数(%)高峰充盈率
(EDV/s)高峰射血率
(EDV/s)2型糖尿病组 83 58.69±6.49 2.50±0.47 2.82±0.35 对照组 51 68.82±7.98 2.79±0.29 2.96±0.19 t值 -7.65 -1.67 -1.05 P值 0.00 0.12 0.31 注:表中,EDV:舒张末期容积遥。 -
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