This paper introduces an adaptive filter method for enhancing ventricular late potentials. The adaptive filter has only one signal electrode and does not need the reference electrode. The experiment results show that this adaptive filter method can effectively improve signal-to-noise ratio of ventricular late potentials.
Action Potentials ; Algorithms ; Computer Simulation ; Electrocardiography ; Humans ; Signal Processing, Computer-Assisted ; instrumentation ; Ventricular Function

Objective: To investigate the biological significance of CerbB-2 expression in nasopharyn-geal carcinoma. Methods: The expression of CerbB-2 was detected in 90 nasopharyngeal carcinoma tissues and 22 nasopharyngitis tissues by SP immunohistochemical method. The relationship between CerbB-2 ex-pression and clinicopathological characteristics of nasopharyngeal carcinoma was investigated. Results: The positive expression rate of CerbB-2 protein was 65.56% in nasopharyngeal carcinoma tissues, and 31.82% in nasopharyngitis tissues, with a significant difference (P<0.05). The ratio of expression was 81.0% in patients of N_2 and N_3 lymth node stage, significantly different from that in patients of N_0 and N_1 lymph node stage (52.1%, P<0.05). The expression of CerbB-2 gene was not correlated with age, gender, clinical stage, T stage and distant metastasis of nasopharyngeal carcinoma (P>0.05). Conclusion: There is a high expression of CerbB-2 in nasopharyngeal carcinoma tissues, which might be an important event in the pathogenesis and progression of nasopharyngeal carcinoma.