Occupational health risk assessment of noise in a coal mining enterprise in Shaanxi Province / 公共卫生与预防医学

Objective To evaluate the noise hazard level of a coal mining enterprise, and identify high-risk operation types and people, and to provide a basis for preventing and controlling the health damage caused by noise. Methods A large coal mining enterprise in Shaanxi Province was selected as the research object. The noise monitoring data of the coal mine over the years was used to calculate the noise exposure matrix of each post in the enterprise, and the classification of occupational hazards at workplaces (GBZ/T 229.4-2012) was used to assess the occupational health risk levels. Results Among the 22 noise-exposed positions in the enterprise, the 8-hour working day equivalent sound level in positions of shearer driver, horseshoe driver, crusher driver, shuttle driver, relaxation screen driver, and grading screen driver were all higher than the occupational exposure limit of noise. In 2021, the noise exposure levels of shearer drivers, crusher drivers, and coal-selecting workers were all higher than 90 dB (A), and the occupational hazard level was moderate hazard level. In addition, the noise exposure levels of most other jobs also exceeded the occupational exposure limit. Conclusion The noise hazards in the coal mine industry are mainly concentrated in the posts of the coal mining system, tunneling system, and screening workshop. Among them, the shearer driver, the crusher driver, and the coal preparation workers have higher noise exposure levels. It is recommended to take corresponding noise reduction measures and strengthen the protection level to reduce the noise exposure risk of workers.

Minimally invasive surgery of intracranial aneurysmas / 临床神经病学杂志

Objective To explore the way and effect of minimally invasive surgery of intracranial aneurysms.Methods 42 aneurysms from 40 patients were clipped under microscope, including 15 cases assisted with endoscope, 2 cases with neuronavigation and 2 cases with endovascular technique.Results 36 aneurysms were clipped, of which 2 were removed and 4 were wrapped. There were no parental arteries clipped incorrectly and no narrowing of the parental arterys under the helping of endoscope. Endovascular technique was applied in two large paraclinoid aneurysms, one was successfully clipped and the other was failed in procedure, but we dissected and clipped it at last by pressing the ICA. Two aneurysms were successfully located and removed under the help of neuronavigation.Conclusion Microneurosurgery combined with neuroendoscope, endovascularity and neuronavigation may reduce surgical injure and improve treatment effect.

Microsurgical treatment of intracranial arachnoid cyst / 临床神经病学杂志

Objective To discuss the effect of microsurgery of intracranial arachnoid cyst. Methods 42 cases of intracranial arachnoid cyst treated with microsurgery were studied retrospectively.Results Total resection was performed in 23 cases and partial resection in 14 cases. 5 cases received partial resection and communication between cystic cavity and brain cistern. CT scans of 29 cases after operation showed completely obliteration or marked diminution in cystic size. The symptoms and signs of all the patients were improved significantly after a 1-year follow-up.Conclusion The effect of microsurgery of intracranial arachnoid cysts is satisfactory. It is important to communicate cystic cavity with subarachnoid space or brain cistern.

Clinical analysis of 22 cases with primary central nervous system malignant lymphoma / 临床神经病学杂志

Objective To explore the clinical characteristics of primary central nervous system malignant lymphoma (PCNSML). Methods The clinical data of 22 cases of PCNSML were analyzed retrospectively.Results The patients in our study mainly presented with headache (16 cases), vomiting (11 cases), weakness of extremities (5 cases) and numbness (1 case). The tumors were supratentorial in 19cases, infratentorial in 3 cases and multiple in 5 cases. CT scan showed same density or high-density lesions with surrounding mild edema. Brain MRI demonstrated slight-hypointense lesion of 9 cases and isointense lesion of 5 cases on T1-weighted imaging. On the T2-weighted imaging, the lesions were slight-hyperintense in 11 cases and isointense in 3 cases. Enhanced scanning showed that the lesions were contrasted evenly and obviously on CT and MRI. Misdiagnosis was given preoperatively in 17 patients. The pathological examination revealed B cell malignant lymphoma in all cases. In 18 cases of follow-up, 5 patients with multiple lesions who only received stereotactic biopsy all died within 6 months, the mean survival time of 6 patients who were treated with total resection of the tumors and radiotherapy was 27 months, 4 patients treated with partial resection and ?-radiotherapy was 21 months, 4 patients treated with partial resection and radiotherapy was 10 months. The patient who was treated with only total resection of the tumor died in 11 months because of recurrent. Two patients with only partial resection died in 5 and 8 months, respectively.Conclusions There are no specific clinical manifestations of PCNSML and the disease is often misdiagnosed preoperatively. Although certain characteristic performance may be found on CT and MRI scans, the final diagnosis of this disease depends on pathological examination. Comprehensive treatments may prolong the survival time of the patients.