In this paper, a reflection type photoelectric pulse wave sensor was designed for short-term pulse rate variability analysis. Photoplethysmography (PPG) signals and ECG signals (obtained with the Dimetek MicroECG recorder Dicare-m1CP) were recorded synchronously from 20 healthy subjects. The analytical results show a significant correlation (correlation coefficient r > 0.99) between the PPG-derived peak-to-peak (PP) intervals and the ECG-derived RR intervals. Besides, there are no significant differences (P > 0.05) between the HRV measured by ECG and the PRV quantified by the PPG whether in time domain, frequency domain, or the Poincaré plot parameters. The experimental results suggest that the PPG-based short-term PRV analysis can be consistent with the ECG-based HRV measurement in wearable smart devices.
Electrocardiography ; Heart Rate ; Humans ; Monitoring, Physiologic ; Photoplethysmography

Objective To investigate the characteristics of distribution and the changes in drug resistance of Enterococci,providing reference for clinical treatment.Methods The distribution and drug resistance in 2547 clinical isolates of Enterococci from 2001 to 2007 in Huzhou Central Hospital and the First People's Hospital of Huzhou were retrospectively analyzed.Results A total of 2547 strains of Enterococci were isolated from 94876 clinical specimens(2.68%),in which Enterococcus faecalis wag primary and Enterococcus faecium Wag ranking the second.The positive rate of Enterococci in urine specimens was the highest,and that in sputum specimens was increasing recently.Enterococci showed higg resistance to erythromycin,rifampin,ciprofloxacin and levofloxacin;Enterococcus faecalis Wag more sensitive to penicillin,ampiciilin and ndtrofurantoin than Enterococcus faecium,while Euterococcus faecium was more sensitive to chloramphended and tetracycline than Enterococcus faecalis;both of them were sensitive to vaneomycin and teicoplanin.Conclusions Enterococcus faecalis and Enterococcus faecium are the common pathogen in Enterococci infections.Enterococci show high drug resistance,so the clinical use of antibiotics should be based on the resuhs of drug sensitivity test.

Objective To assess the variation in patient setup corrections for three different anatomic treat-ment sites using daily pretreatment megavoltage CT(MVCT)in helical tomotherapy,and to analyze alternative refer-ence margins for specific tumor site.Methods Sixty patients treated for three anatomical sites on helical tomotherapy were analyzed.Daily MVCT was carried out for registration and setup corrections before each treatment fraction.Setup errors and rotational setup corrections from 587 head and neck,500 thoracic,371 abdomen and gynecology MCVT imaging were input to statistical analysis.Incidences of three dimensional vector error lengths were calculated for each anatomic site.Overall distribution histograms of the three -dimensionally error was presented using GraphPad Prism 5.The distributions of systematic and random setup errors were quantitative analyzed and the additional margins required were also taken into account.Results 1 458 MVCT scans were implemented for sixty patients.Head and neck had lower frequencies of translational setup errors than others.Frequency of at least 3mm three -dimensional setup errors for head and neck,thoracic,abdomen and gynecology was 55.3%,70.8%,79.8%,respectively.This fre-quency decreased to 17.5%,40.6%,47.2% if 3D vector distance ≥5mm was scored.Overall systematic errors ranged from -1.4mm to 2.7mm,abdomen and gynecology had the largest setup errors in the vertical direction which was statistically significant(χ2 =19.3,P <0.05).The suggested margins should be increased by 4 -7 mm in three -dimensional direction for head and neck,9 -14mm for thoracic,10 -17mm for abdomen and gynecology.Conclusion Differences in setup corrections are perceived between head and neck,thoracic,abdomen and gynecology.The accura-cy of patient positioning can be improved if pre -treatment daily MVCT scans are put into use.Results from setup cor-rection can provide evidence for tumor treatment margin and improve the accuracy of regular radiotherapy.

Objective To evaluate the effect of decompression suction drainage treated mandibular cystic lesions,and compared with the othertreatments such as surgery,decompression,and suction drainage.In order to explore its value in the field of mandible conservative treatment.Methods 36 cases of mandibular cystic lesions were performed decompression and suction drainage.Compared the cystic size before and after the treatment to evaluate the clinical effect.Results According the pathology,29 cases are cyst and 7 cases are mural-ameloblastoma.28 cases which X-ray show a remarkable lessen,6 cases have no change and 2 cases deteriorated.Conclusion decompression suction drainage is one of the ideal treatment for mandibular cystic lesions.

ObjectiveTo investigate the protein wasting and energy reserve in chronic renal failure (CRF) patients undergoing maintaining hemodialysis (HD) at different ages.MethodsA total of 129 CRF patients (62 men and 67 women) aged (56.33 ± 14.14) years on HD were enrolled in this study.They were divided into four age groups:below 40,40-69,60-69,and over 70 years.Nutritional status was assessed by body mass index (BMI),normalized protein catabolic rate (nPCR),and biochemical parameters including pre-albumin,cholesterol,and creatinine.Body composition was tested with multi-frequency bioelectric impedance analysis.Meanwhile,83 healthy subjects,matched for age and sex,were enrolled as controls.ResultsBMI showed no significant difference between healthy controls and HD patients.Among HD patients,38％ had an BMI higher than the normal high limit and 6.2％ had a BMI less than 18.5kg/m2 ; patients with a low body weight accounted for 0,6.2％,4.8％,and 11.1％ in the ＜40 years group,40-59 years group,60-69 years group,and above 70 years groups,respectively.nPCR in the above 70 years group was ( 1.46 ±0.28) g/( kg·d),which was significantly lower than that in the 40-59 years group [ (1.54 ±0.28) g/( kg·d) ; P =0.004) ; the serum creatinine in the the above 70 years group was (834.08 ± 184.96) μmol/L,which was significantly lower than that in 40-59 years group [ (976.24 ± 186.86) μmol/l ] ( P=0.037) ; the prealbumin in the the above 70 years group was (272.65 ±79.78) mg/L,which was significantly lower than that in 40-59 year group [ (332.07 ± 73.03 ) mg/L] ( P =0.026).Body cell mass in HD patients was (22.81 ±8.12) kg,which was significantly lower than that in the control group [ (29.95 ±6.73) kg] (P＜0.001) ; furthermore,the lean tissue mass (LTM) [ (40.16±11.90) kg vs.(47.22 ±9.84) kg] and fat [ (17.45± 8.83)vs.(13.66±7.28) kg] were also significantly lower (both P=0.001 ).The lean tissue indicators in the below 40 years group were also significantly lower than those in the healthy controls ( P =0.012).For the fat tissue ingredients,the below 40 years group ( P =0.013 ) and over 70 years group (P =0.039) showed significant differences with the controls,while the 60-69 years group (P =0.191 ) showed no such difference.ConclusionsNutritional status is different among HD patients at different ages.HD patients below 40 years and abover 70 years are more susceptible to malnutrition.Although BMI shows no difference with the normal subjects,protein wasting and increased fat tissue storage do exist in HD patients.The nutrition changes are slightest in 40-59 years old and much severer in over 70 years old patients.

Objective To estimate the prevalence of sexually transmitted diseases(STDs) among men who have sex with men (MSM) in some cities of Jiangsu province.Methods A cross-sectional questionnaire survey was carried out among MSM attending gay bars in some cities of Jiangsu province.Participants underwent screening for STDs in accordance with their personal wishes.Urethral swabs,first void urine and blood samples were collected at these survey sites and delivered to the STD research laboratory for testing.Univariate analysis and multivariate logistic regression analysis were performed to assess factors associated with STDs.Results A total of 388 subjects completed the questionnaire and underwent physical examination and STD screening.Of these subjects,45.6％ had only homosexual behavior.Examination of urine or urethral swab specimens showed that the prevalence rate was 1.3％ (5/388),9.4％ (36/385),17.2％ (66/384) and 28.1％ (109/388) for Neisseda gonorrhoeae,Chlamydia trachomatis,Mycoplasma genitalium and Ureaplasma urealyticum infection respectively.Serological tests revealed that the positivity rate was 1.0％ (4/388) for anti-human immunodeficiency virus (HIV)antibody,18.8％(73/388) for Treponema pallidum particle agglutination assay (TPPA),12.1％(47/388) for rapid plasma reagin (RPR) test,9.8％ (38/388) for human herpes simplex virus (HSV)-2-IgG,9.8％ (38/388) for hepatitis B surface antigen,1.0％ (4/388) for anti-hepatitis C virus antibody and 2.1％ (8/388) for anti-hepatitis E virus antibody.Multivariate analysis indicated that Chlamydia trachomatis infection was independently and significantly associated with polymorphonuclear leucocyte (PMNL) counts in urethral swab smears (adjusted odds ratio (AOR):5.30,95％ CI:2.04-13.77,P ＜ 0.01),Mycoplasma genitalium infection was significantly associated with age (AOR:2.84,95％ CI:1.17-6.87,P＜ 0.05),PMNL counts in urethral swab smears (AOR:2.37,95％ CI:1.01-557,P＜ 0.05) and urethral discomfort in the past three months (AOR:2.43,95％ CI.1.18-5.02,P＜ 0.05),and syphilis (defined as a positive TPPA and RPR test) was associated with age (AOR:2.46,95％ CI:1.05-5.75,P ＜ 0.05) and seropositivity for anti-HSV-2 antibodies (AOR:3.70,95％ CI:1.62-8.44,P ＜ 0.01).Conclusions There is a high prevalence of STDs among MSM attending gay bars in some cities of Jiangsu province,with Chlamydia trachomatis and Mycoplasma genitalium as the most common pathogens of urethritis.

Objective To explore the inter-fraction setup errors and affecting factors from data of daily fan-beam megavoltage computed tomography(MVCT). Methods A total of 37consecutive NPC patients treated with tomotherapy were hospitalized during the period of February 2015 to September 2015. For each patient,one MVCT scan was obtained after conventional positioning ,online correction and tomotherapy delivery daily ,and the scans were put into the planning computed tomography to determine inter-fraction setup errors. The MPTV was calculated with the equation:MPTV=2.5∑+0.7σ(∑:systematic error;σ:random error). Results The average absolute errors of the inter-fraction were(2.102 ± 0.0406)mm,(1.490 ± 0.0348)mm,(1.306 ± 0.335)mm and(1.392 ± 0.0384)° at three dimensions. The total MPTV accounting for inter-error was 3.4675 mm,2.9795 mm,and 2.8885 mm. Gradual increases in both inter-fraction three-dimensional displacement were observed with time and treatment(P < 0.05). Univariate analysis revealed that weight loss and retraction of neck lymph nodes were affecting factors of set-up errors. Conclusions 3 mm margins uniformly expended from clinical target volume to planning target volume may not be suitable. The personalized margin should be adopted for the design of IMRT planning. Displacement increases as a treatment course is prolonged.

Objective To evaluate the inter-fraction setup error during the treatment with megavoltage computed tomography (MVCT) and provide theoretical basis for clinical target volume-planning target volume (CTV-PTV) margins for nasopharyngeal carcinoma (NPC) patients treated with tomotherapy.Methods Thirty-seven consecutive NPC patients treated with tomotherapy were prospectively enrolled for the study between February 2015 and September 2015.For each patient,one MVCT scan was obtained after conventional positioning,online correction and tomotherapy delivery daily,and the scan was registered to the planning CT to determine inter-fraction setup error.The expanding margin for PTV (MPTV) was calculated with the recipe:MPTV =2.5∑ + 0.76 (∑:systematic error;6:random error).Results The average absolute errors of the inter-fraction were (2.102 ± 0.040 6) mm,(1.490 ± 0.034 8) mm,(1.306 ± 0.335) mm and (1.392 ± 0.038 4) ° in the three dimensions.Gradual increases in both inter-fraction three-dimensional displacement were observed with time and treatment (P ＜ 0.05).The total MPTV ac counting for inter-error were 3.467 5 mm,2.979 5 mm and 2.888 5 mm.Conclusions Tomotherapy irradiation technology personalized MPTV should be adopted for the design of tomotherapy plan.Displacement increased as a function of time.

In this paper, a reflection type photoelectric pulse wave sensor was designed for short-term pulse rate variability analysis. Photoplethysmography (PPG) signals and ECG signals (obtained with the Dimetek MicroECG recorder Dicare-m1CP) were recorded synchronously from 20 healthy subjects. The analytical results show a significant correlation (correlation coefficient r > 0.99) between the PPG-derived peak-to-peak (PP) intervals and the ECG-derived RR intervals. Besides, there are no significant differences (P > 0.05) between the HRV measured by ECG and the PRV quantified by the PPG whether in time domain, frequency domain, or the Poincaré plot parameters. The experimental results suggest that the PPG-based short-term PRV analysis can be consistent with the ECG-based HRV measurement in wearable smart devices.

As more and more people are becoming aged in China and many of them tend to suffer from chronic cardiac problems, the long-term dynamic cardiac monitoring for freely moving patients becomes essential. A new design for continuous ECG recording on the freely moving patients at home and/or at work is proposed here. It is miniature in size, using digital technologies of the low gain amplifier, the high resolution analog to digital converter and the real-time digital filter that features > 100dB input signal dynamic range (ISDR), > 100dB common-mode rejection ratio (CMRR), and < 5microV (RMS) internal noise. The device works continuously more than 24 hours with a pair of AAA batteries, and is capable of storing the recorded data into a storage card. The preliminary tests showed that the P-QRS-T waveforms were captured and displayed smoothly in resting, walking, and activities, making the device useful in monitoring and analyzing for the patients on the move.
Electrocardiography, Ambulatory ; instrumentation ; methods ; Equipment Design ; Humans ; Signal Processing, Computer-Assisted ; Software