ABSTRACT
Objective To study the feature extraction methods for the event related potential (ERP) evoked by mental arithmetical tasks through the sample entropy, in order to enhance the features of electroencephalograph (EEG) signals for brain computer interface (BCI).Methods Three types of mental arithmetic tasks including a simple counting, a random number and a stroke of Chinese character counting were proposed and 16 channel EEG signals were recorded from eight healthy subjects.The sample entropy method was then applied in characteristic signal complexity analysis.The characteristic and difference of signal complexity of ERP evoked by three types of mental arithmetical tasks were explored.Results The entropy value for EEG signal evoked by non-target stimulus was higher than that by the target stimulus with the significant difference (P＜0.01).The entropy of the mental arithmetic based on the Chinese characters counting task was significandy higher than that of the other two tasks (P＜0.05).EEG signals evoked by target/non-target were fundamentally signals under the state of attention or non-attention.Conclusions For the Chinese characters counting task, more complex information have been processed by the brain and the non-linear connection between nerve cells are much more complicated and a higher entropy value is achieved.In summary, the mental arithmetic task can effectively activate the relevant brain regions and the sample entropy can distinguish signals evoked by target or non-target stimuli.
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@#Objective To investigate the mental health and related factors for benign prostatic hyperplasia (BPH) patients. Methods 200 patients with BPH were investigate with the 4 dimensions of Quality of Life Scale for BPH patients (BPHQLS): worry about disease, psychological mood, social interaction and satisfaction. Results 85.50% of patients with BPH were in medium or poor mental health (standard score ≤80%). The total score of BPHQLS did not correlate with age, course of disease, and marital status (P>0.05), but correlated with degree of education and profession (P<0.05). Partial correlation analysis showed the total score correlated with the years of education (P<0.01). Conclusion Patients with BPH are in poor mental health. Degree of education is the main factors related with their mental health.
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Objective To explore the correlation between the parameters of ambulatory blood pressure monitoring (ABPM) and prostatic volume in elderly patients with essential hypertension.Methods The 131 elderly patients with essential hypertension from March 2007 to December 2009 were enrolled in this study, including 102 benign prostatic hyperplasia (BPH) patients and 29 nonBPH (NBPH) patients. All patients underwent ABPM and ultrasound examination of prostate.Prostatic volumes (PV) were calculated and were compared between BPH group and NBPH group.Correlation between parameters of ABPM and PV was analyzed. Results (1)The maximal mean artery pressure (MAPmax) at night was higher in BPH group than in NBPH group [( 104.7 ± 12. 0)mm Hg vs. (99.6± 10. 1) mm Hg, P= 0.039]. (2)There were correlations between PV and MAPmax in all-day (r=0. 184, P=0. 035), MAPmax at daytime (r=0. 183, P=0. 037), MAPmax at night (r=0. 181, P=0. 040), respectively. Conclusions MAPmax of ABPM may be associated with PV in elderly patients with essential hypertension.