Objective To validate the clinical effects of two feedback cancellation technologies, PureWave Feedback Eliminator and Active Feedback Intercept based on different platform, in hearing aids open fitting.Methods 40 patients(40 ears) were selected randomly to use the different products(RIC and ZON),which represent the different technologies(PureWave Feedback Eliminator and Active Feedback Intercept respectively), for testing ASG and MSG in the same condition of ear canal .Same receivers (50 dB) were placed in ear canals with medium earbud. Patients aged from 16 to 70 years old, mean age was 40?18.04,and the average PTA was 55.7?14.8 dB HL.Results ASG testing results under two technologies were different. ASG under PureWave Feedback Eliminator was 25.12 dB and that of AFI was 20.33 dB. Maximum difference of MSG gained from the two technologies at 3 kHz and 6.5 kHz were 8 dB and 6 dB,respectively.Conclusion PureWave Feedback Eliminator technology maintains a clear lead of ASG in hearing aids open fitting model, which is helpful for increasing fitting ranges for open fitting and improving comfort and cosmetic.

Objective To explore the relationship of the expression, regulation and adhesion of PTA1 in pregnancy induced hypertension(PIH). Methods The expression,regulation and adhesion of PTA1 on vascular en- dothelial cells incubated by sera from 10 PIH patients and 10 normal pregnant women repectively was detected by flow cytometry. Results The positive rate of PTA1 15.51% (24h) and 6.32 % (48h) in PIH group is significantly higher than that 7.81% (24h) and 4.72 % (48h) in normal pregnant woman group( P < 0.01 ). After the incubation with platelets,the positive rate of PTA1 6.64% (24h) and 4.13% (48h) in PIH group is lower than before(P< 0.05). The PTA1 expression 8.11% (24h) and 4.28% (48h) in PIH group is much lower after blocking with PTA1/IgG than that before(P < 0.01 ). Conclusion There are some abnormal stimulated factors in PIH patients, which activate vascular endothelial cells. PTA1 plays an important role in the adhesion of platelets to vascular en- dothelial cells, PTA1 is closely related to the progress of PIH which indicates that PTA1 directly or indirectly takes part in the pathophysiologic consequences of PIH.