Changes in heart rate of fetal is function regulating performance of the circulatory system and the central nervous system, it is significant to detect heart rate of fetus in perinatal fetal. This paper puts forward the fetal heart rate detection method based on short time Fourier transform and blind source separation. First of all, the mixed ECG signal was preprocessed, and then the wavelet transform technique was used to separate the fetal ECG signal with noise from mixed ECG signal, after that, the short-time Fourier transform and the blind separation were carried on it, and then calculated the correlation coefficient of it, Finally, An independent component that it has strongest correlation with the original signal was selected to make FECG peak detection and calculated the fetal instantaneous heart rate. The experimental results show that the method can improve the detection rate of the FECG peak (R), and it has high accuracy in fixing peak(R) location in the case of low signal-noise ratio.
Electrocardiography ; Fetus ; Heart Rate, Fetal ; Humans

Creatures living in liquid environment can form special exterior structure, internal framework, movement and substance distribution according to their respective living condition. This paper focused on the analysis via examples of macroscopic and microscopic organism. Quantitative analysis is used to make the description more exact and internal features of the organism easier to be examed.

The procedure of occlusal treatment involves improving the morphology and the stomatognathic function.Several practical methods and morphological endpoints have been described in occlusal rehabilitation.We made a selection of these (mandibular position,oc-clusal plane,occlusal guidance,occlusal contact,face-bow transfer,use of an adjustable articulator and occlusal support)and performed a literature review to verify the existence of compelling scientific evidence for each of these.A literature search was conducted using Medline /PubMed in March 2011.Over 400 abstracts were reviewed,and more than 50 manuscripts selected.An additional hand search was also con-ducted.Of the many studies investigating stomatognathic function in relation to specific occlusal schemes,most studies were poorly designed and of low quality,thus yielding ambiguous results.Overall,there is no scientific evidence that supports any specific occlusal scheme being superior to others in terms of improving stomatognathic function,nor that sophisticated methods are superior to simpler ones in terms of clini-cal outcomes.However,it is obvious that the art of occlusal rehabilitation requires accurate,reproducible,easy and quick procedures to re-duce unnecessary technical failures and /or the requirement for compensatory adjustments.Therefore,despite the lack of scientific evidence for specific treatments,the acquisition of these general skills by dentists and attaining profound knowledge and skills in postgraduate training will be necessary for specialists in charge of complicated cases.

Diabetic macular edema (DME) is a common ocular complication of diabetes patients.It mainly involve macular which is closely related with visual function,thus DME is one of the major reasons causing visual impairment or blindness for diabetes patients.How to reduce the visual damage of DME is always a big challenge in the ophthalmic practice.In the past three decades,there are tremendous developments in DME treatments,from laser photocoagulation,anti-inflammation drugs to anti-vascular endothelial growth factor therapy.However,the mechanism of DME development is not yet completely clear; every existing treatment has its own advantages and weaknesses.Therefore DME treatment still challenges us to explore further to reduce the DME damages.

The pathogenesis of diabetic retinopathy (DR) is more complex. For the upstream of traditional pathogenesis, to looking for unifying mechanism theory which proposed in foundation of common promoters and the latest view of DR may be the result of chronic inflammation. Both of them provide the basic and clinical theraby of DR with new direction. Therefore, there are many related issuess till needs to intensive study.

Objective To evaluate the effect of sevoflurane preconditioning on autophagy during ischemiareperfusion (I/R) injury to isolated rat hearts and the role of PI3K/Akt signaling pathway.Methods Healthy adult male Wistar rats,aged 6-8 weeks,weighing 250-280 g,were anesthetized.Their hearts were excised and perfused in a Langendorff apparatus.Eighty-four isolated rat hearts with I/R injury were randomly divided into 7 groups (n =12 each):normal control group (NC group),I/R group,sevoflurane preconditioning group (S + I/R group),normal control plus wortmannin group (NC + W group),I/R plus wortmannin group (I/R + W group),sevoflurane preconditioning plus wortmannin group (S + I/R + W group),and solvent group (S + I/R + D group).In NC group,the hearts were continuously perfused with K-H solution for 180 min.In I/R group,the hearts were perfused with K-H solution for 30 min,and then subjected to ischemia for 30 min followed by 120 min of reperfusion.In S+ I/R group,the hearts were perfused with K-H solution for 10 min,and then with K-H solution saturated with 2.5％ sevoflurane for 15 min,followed by 5 min washout with K-H solution before ischemia.In NC + W group,wortmannin (PI3K inhibitor) 15 μg/kg was injected intraperitoneally at 30 min before chest opening,and the other procedures were similar to those previously described in group NC.In I/R + W group,wortmarnin 15 μg/kg was injected intraperitoneally at 30 min before chest opening,and the other procedures were similar to those previously described in group I/R.In S + I/R + W group,wortmannin 15 μg/kg was injected intraperitoneally at 30 min before chest opening,and the other procedures were similar to those previously described in S + I/R group.In S + I/R + D group,dimethyl sulfoxide 1.5 ml/kg was injected intraperitoneally at 30 min before chest opening,and the other procedures were similar to those previously described in group S + I/R.The HR,± dp/dtmax,left ventricular developed pressure (LVDP) and left ventricular end-diastolic pressure (LVEDP) were recorded at the end of equilibration and reperfusion.At the end of reperfusion,coronary effluent was collected to detect lactate dehydrogenase (LDH) activity,and myocardial specimens were obtained to calculate the percentage of myocardial infract size.The expression of autophagy marker LC3-Ⅱ and Akt,phosphor-Akt (p-Akt),mammalian target of rapamycin (mTOR),and phosphor-mTOR (p-mTOR) was determined by Western blot.Results Compared with NC group,no significant change was found in the parameters of hemodynamics in NC + W group,and HR,± dp/dtmax and LVDP were significantly decreased,LVEDP,myocardial infract size,and LDH activity were increased,LC3-Ⅱ expression was up-regulated,and the expression of p-Akt and p-mTOR was down-regulated in the other groups.Compared with group I/R,HR,± dp/dtmax,and LVDP were significantly increased,LVEDP,myocardial infract size,and LDH activity were decreased,LC3-Ⅱ expression was downregulated,and the expression of p-Akt and p-mTOR was up-regulated in S + I/R and S + I/R + D groups,and no significant change was found in each parameter in S+ I/R+ W group.Compared with S + I/R group,HR,± dp/ dtmax and LVDP were significantly decreased,LVEDP,myocardial infract size and LDH activity were increased,LC3-Ⅱ expression was up-regulated,and the expression of p-Akt and p-mTOR was down-regulated in S + I/R + W group,and no significant change was found in each parameter in S + I/R + D group.Conclusion Sevoflurane preconditioning can decrease autophagy of myocardial cells during I/R through activating PI3K/Akt signaling pathway and enhancing mTOR activity in the downstream,thus protecting isolated rat hearts against I/R injury.

Objective To study the protective effect of nalmefene hydrochloride on lung ischemia-reperfusion injury and its mechanism.Methods 40 rats were randomly divided into model group,high dose of nalmefene group,low dose nalmefene group and sham operation group equally(n =10).The lung ischemia-reperfusion model was established by occlusion of the left pulmonary hilum.The intravenous injection of nalmefene (20,10 μg·kg-1) was applied at 10 minutes before occlusion of the left pulmonary hilum in the high dose of nalmefene group and the low dose of nalmefene group,respectively.The sham operation group without occlusion of the left pulmonary hilum was not given any treatment.At 2 h after reperfusion,all rats were detected arterial blood gas value and then sacrificed.The specimens from the upper lobe of the left lung tissue were preserved to observe pulmonary lesions,detect the ratio of wet / dry weight and the expressions of β-endorphin and interleukin(IL)-17.Results Compared with the model group,the value of PCO2,the degree of pulmonary lesions,the ratio of wet / dry weight and the expressions of β-endorphin and IL-17 in lung tissue were significantly decreased (P ＜ 0.01),while the value of PO2 was significantly increased (P ＜ 0.01) in the low dose of nalmefene group.Compared with the low dose of nalmefene group,thevalue of PCO2,the degree of pulmonary lesions,the ratio of wet/dry weight and the expressions of β-endorphin and IL-17 in lung tissue were significantly decreased (P ＜ 0.01),while the value of PO2was significantly increased (P ＜ 0.01) in the high dose of nalmefene group.Conclusion Nalmefene hydrochloride may prevent lung ischemia-reperfusion injury in a dose dependent manner by reducing the production of β-endorphin and inhibiting the expression of IL-17 in lung tissue.

Objective To investigate the effect of hemodialysis(HD) on the endothelial cells of the patients with end-stage renal disease(ESRD). Methods The study population consisted of 30 patients with undergoing first hemodialysis treatment and 20 healthy individuals from March to November of 2003.The number of circulating endothelial cells(CEC) and the concentration of von Willebrand factor(vWF) were measured in HD patients at predialysis,1h during HD,2h during HD,and the end of HD.CEC and vWF were observed in healthy subjects. Results CEC and vWF were increased in HD patients compared with healthy individuals,and elevated continuously during HD.Increased CEC and vWF were correlated significantly with duration of HD. Conclusion Endothelial cell dysfunction exists in the patients with ESRD.HD procedures may cause endothelial cell damage.

Objective To observe the subfoveal choroidal thickness (SFCT) in eyes of patients with diabetic macular edema (DME).Methods Twenty patients (32 eyes) with DME were enrolled in this crosssectional observational study.The patients included 12 males and eight females,with a mean age of (47.3± 10.2) years.All the patients were examined documenting best corrected visual acuity (BCVA),spectraldomain optical coherence tomography (OCT) and ophthalmological examination.According to OCT DME morphology,samples are divided into diffuse macular edema,cystoid macular edema,serous retinal detachment and hard exudate groups.The SFCT was measured by a Cirrus HD-OCT with enhanced depth imaging (EDI) and was compared with the average SFCT (286.84 ± 28.80) μm of same age group.Correlation between SFCT and age,diopter,diabetic duration,fasting blood glucose,BCVA and central retinal thickness were analyzed by Pearson Analysis.SFCT of different DME types were analyzed by ANOVA Analysis.Results The mean SFCT of 32 eyes was (223.81±43.74) μm (ranging from 120.50 to 361.50 μm),which was lower by 63.03 μm (95％ confidence interval,-78.80 to-47.26 μm,P＜0.01)from normal SFCT.SFCT was independent of age (r=0.124),diopter (r=0.277),diabetic duration (r=0.286),fasting blood glucose (r=0.408),BCVA (r=0.087),and central retinal thickness (r=0.036).There was no significant difference of SFCT between different DME types (F =0.042,P ＞ 0.05).Conclusion SFCT is thinner in eyes with DME as compared to normal eyes of the same age.

Objective To study the risk factors for cerebral infarction resulting from transient ischemic attack (TIA).Methods The clinical data of 144 hospitalized patients with TIA were evaluated.Results 50 patients (34.7%) suffered from cerebral infarction(CI) following the onset of TIA in 144 patients.11 cases with CI resulted from vertebra-basilar artery system,37 cases resulted from internal carotid artery system. There was significantly different in two artery systems( P