Atrial fibrillation detection using millimeter-wave radar / 中国医学物理学杂志

A novel technology is proposed for non-contact and real-time detection of atrial fibrillation using millimeter-wave radar.A 60 GHz PCR millimeter wave radar is used to continuously detect the chest echo signal of the subject.After signal acquisition,I-Q signal is generated through I-Q demodulation,and the signal phase information is extracted using effective points phase trend evaluation for obtaining the signals from oscillations in the chest wall,from which the respiratory signals and cardiac signals are extracted through digital filtering for the analysis of cardiac movement.Whether the atrial fibrillation occurs or not is determined by the characteristics of atrial fibrillation wave in the time domain.The effective points phase trend evaluation for extracting more accurate signal phase information and the time-domain method for real-time atrial fibrillation detection are the innovations of the study.The experimental results show that the proposed method achieves a detection accuracy of 99.2%in clinic.

Reference and Innovation: Research on the Construction of Medical Device Registrar System / 中国医疗器械杂志

In order to strengthen the integration of reform system and build a comprehensive integration of openness and innovation, the medical device registrar system has become the institutional choice to promote the reform of the medical approval system and the innovation and development of the industry. The system allows scientific researchers, R&D institutions and enterprises to become applicants for medical device registration and to consign the production of samples and products, thus realizing the separation of market license and production license, and breaking the binding relationship between registration and production in current regulations. The medical device registrar system has laid a theoretical foundation for remolding the management system of medical devices, and has also made practical exploration for improving the reform of the medical devices supervision system, so it has important theoretical and practical significance.

Effect of silencing a disintegrin and metalloprotease 12 expression on self-renewal capacity of CD133 posi-tive giloma cells / 中国神经精神疾病杂志

Objective To investigate the inhibitory effect of a disintegrin and metalloprotease 12 silenced by shR?NA on self-renewal capacity of CD133 positive giloma cells. Methods The shRNA recombinant lentivirus aimed at si?lencing ADAM12 was prepared. Human glioma cells U87 were employed in this study and assigned into three groups:shRNA-ADAM12, shRNA-NCandshRNA-C. ADAM12 expression was detected at mRNA and protein level using Re?al-time quantitative-PCR and western bloting, respectively. U87 cells were cultured with stem cell culture medium, to obtain cell sphere formation in which CD133 positive glioma cells were enriched. Immunofluorescence was employed to detect the expression of ADAM12 and CD133 in cell spheres and U87 cells; Self-renewal was tested by using tumor sphere formation assay. Molecular markers for differentiated or undifferentiated cells (CD133,GFAP and Tuj1) were de?tected at protein using western blotting. Western blotting was employed to test protein expression of HES1. Results AD?AM12 shRNA significantly down-regulated the mRNA and protein expression levels of ADAM12. Compared with shRNA–C group, the relative expression levels of mRNA in shRNA-ADAM12 group and shRNA-NC group were 0.22 ± 0.03 and 0.98 ± 0.06 (F=425.37,P<0.01). The relative expression levels of protein in shRNA-ADAM12 group, shRNA-NC group and shRNA-C group were 28.72%±2.36%, 69.21%±3.92%and 69.04%±3.57%, respectively (F=145.42,P<0.01). Immunofluorescence staining showed that expression levels of ADAM12 and CD133 in cell spheres were significantly higher than those in normal cells. The number of spheres in three groups were 45.5±2.3、104.2±5.8 and 109.6±6.2, tumor sphere formation ability of shRNA-ADAM12 group was lower than that of shRNA-NC group and shRNA-C group (F=147.03,P<0.01). Compared with the shRNA-NC group and shRNA-C group, the protain expression of GFAP and Tuj1 were increased up to 166% and 146% (P<0.01) whereas the protein expression levels of CD133 and HES1 were down-regulated by 54% and 50% (P<0.01). Conclusion Knockdown of ADAM12 may suppress self-renewal ability of CD133 positive glioma cells by inhibiting the Notch pathway activity.

Brief Introduction on the Disclosure of FDA Information in US and Its Implication / 中国药房

OBJECTIVE:To provide reference for food & drug regulatory authorities in China to disclose government information.METHODS:In the light of the development and status quo of the disclosure of information in US FDA,the access,content and procedure for the disclosure of information in FDA were discussed.RESULTS & CONCLUSIONS:There are many similarities between US and China in the disclosure of information.In view of the practical situation of governmental information disclosure in food and drug regulatory authorities in China,Chinese government should be able to find out such key issues as the human and financial support is much needed in FDA information disclosure,the disclosure level should be in line with our national condition,a three-dimensional publicity system of government information at different level should be established and emphasis should be laid to the key disclosed information etc based on the research on the development,access,content and procedure of information disclosure in FDA.