机构地区:[1]广西职业病防治研究院,南宁530021 [2]广西医科大学公共卫生学院 [3]广西医科大学第一附属医院放射科 [4]广西医科大学神经内科 [5]美国普度大学卫生科学学院
出 处:《中华预防医学杂志》2009年第9期793-797,共5页Chinese Journal of Preventive Medicine
基 金:国家十一五科技支撑重点项目(2006BA106802);广西自然科学基金(0991129)
摘 要:目的探讨锰暴露对工人苍白球磁共振(MR)T1加权成像(T1WI)信号强度的影响,为寻找锰致中枢神经系统(CNS)损伤的暴露生物学标志提供科学依据。方法采用1.5TMR对18例无症状锰暴露工人、8例慢性轻度锰中毒工人和9名健康对照工人进行常规T1WI、T2WI。测定T1WI苍白球信号强度(SIGP)和同侧额叶白质信号强度(SIFWM),计算苍白球指数(PI)。采用火焰原子吸收光谱法(AAS)和电感耦合等离子原子发射光谱分析法(ICP—AES)分别测定作业环境空气MnO:浓度和血红细胞锰(MnRBC)含量。对8例高锰暴露工人进行1年后的追踪调查。结果锰暴露组冶炼作业环境空气MnO2浓度中位数为0.64ms/m3(0.07—5.40ms/m3),低锰暴露(配电室)作业环境空气MnO:浓度中位数为0.56ms/m3(0.09~1.71ms/m3),高锰暴露(炉前工)作业环境空气MnO2浓度中位数为0.89ms/m3(0.07—5.goms/m3)。锰暴露组(116.4±8.2)及其高锰暴露亚组(119.0±7.9)PI均值高于中毒组(105.3+8.4)和对照组(102.2±1.5),差异有统计学意义(锰暴露组与对照组比较,t’=7.146,P=0.000;与中毒组比较,t=3.181,P=0.004。高锰暴露亚组与对照组比较,t’=7.446,P=0.000;与中毒组比较,t=3.763,P=0.001),锰暴露工人GPMRT.WI信号增强,以高锰暴露更明显。锰暴露组及其亚组、对照组MnRBC含量高于中毒组,差异有统计学意义[MnRBC含量依次为(151.6±40.5)ns/ml、(149.2±21.3)ns/ml、(154.5±46.6)ns/ml、(144.4±14.2)ns/ml、(20.8±7.4)ns/ml。中毒组与对照组比较,t=20.206,P=0.000;与锰暴露组比较,t’=13.144,P=0.000。中毒组与低、高锰暴露亚组比较,t'值分别为12.964、9.957,P=0.000]。8例高锰暴露工人1年后追踪调查仅发现作业环境空气MnO,浓度中�Objective Variations of the signal intensities in the magnetic resonance (MR) T1- weighted image (T1 WI) of globus pallidus among manganese(Mn)-exposed workers were explored to provide a scientific basis for exposed biomarker of manganese-injured central nervous system ( CNS ). Methods The brain MR T~ and T2 WI in eighteen male asymptomatic Mn-exposed, eight manganism and nine healthy control workers were examined routinely by adopting a 1.5 Tesla signal superconducting system. The SIGP and the signal intensity in frontal white matter (SIFWM) in the same side were determined, then palllidal index (PI) was calculated. Concentration of MnO2 in workplaces and content of manganese in red blood cell (MnRBC) among workers were respectively determined by flame atomic absorption spectrometer (AAS) and inductively coupled plasma-atomic emission spectrophotometry (ICP-AES). The follow-up investigation in the eight high Mn-exposed workers was made one year later. Results The results showed that the median of air MnO2 in smelting workplace was 0. 64 mg/m3 (0.07 - 5.40 mg/m3 ), which were respective 0. 56 mg/m3 (0. 09 - 1.71 mg/m3 ) in power distribution room ( low Mn-exposure) and 0. 89 mg/m3 ( 0. 07 - 5.40 mg/ m3) in furnace (high Mn-exposure). PI in the Mn-exposed and high Mn-exposed workers were both higher than those of the manganism and control workers( 116. 4 ±8.2,119.0 ±7.9,105.3 ±8.4 and 102. 2 ± 1.5, respectively. Mn vs control, t' = 7. 146, P = 0. 000; Mn vs manganism, t = 3. 181, P = 0. 004. High Mnexposure vs control, t' = 7. 446, P = 0. 000 ; high Mn-exposure vs manganism, t = 3. 763, P = 0. 001 ). The increased signal in T1WI of globus pallidus was observed in Mn-exposed workers, especially in high Mn- exposed workers. The content of manganese in red blood cell of Mn-exposed and control workers was significantly higher than those of the manganism workers [ ( 151.6 ± 40. 5 ) ng/ml, ( 149. 2 ± 21.3 ) ng/ml, ( 154. 5 ± 46. 6 ) ng/ml
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