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Objective:To study the basic situation of Yunnan Province Suncus murinus carrying plague phage and to explore its epidemiological significance. Methods:From 2015 to 2018, a survey of plague host animals was carried out in 10 investigation sites in the historical plague foci, new plague foci (after 1982) and stubborn plague foci of domestric mouse in Yunnan Province. The plague phage was isolated and cultured from the intestinal specimens of Suncus murinus. The growth of plaque was observed by double-layer plate method, and the morphology and structure of plague phage were observed under electron microscope. At the same time, intestinal samples were taken to detect the structural gene caf1 of F1 antigen of Yersinia pestis. Results:In this study, a total of 157 Suncus murinus were captured and 16 strains of plague phage were isolated, with a total isolation rate of 10.19%. There was no difference in plague phage isolation rate between historical plague foci (10.00%, 1/10) and stubborn plague foci (16.22%, 12/74), new plague foci (4.11%, 3/73, χ 2 = 0.00, P = 0.965; Fisher test, P = 1.000). However, there was a difference in plague phage isolation rate between stubborn plague foci and new plague foci (χ 2 = 5.88, P = 0.015). There was no significant difference in the isolation rate of plague phage among different sex, growth period and habitat ( P > 0.05). The plaque morphology of the isolated plague phage was diverse, of which four strains were myotavirus phages; and all samples were negative for F1 antigen structural gene caf1. Conclusions:Suncus murinus is widely distributed in the domestic mouse plague foci in Yunnan Province, and the animals carry a certain number of plague phage. Regular surveillance of Suncus murinus and their plague phage has a certain guiding significance for the surveillance and early warning of plague in Yunnan Province.
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Objective:To evaluate the impact of laparotomy pancreatoduodenectomy (OPD), laparoscopic pancreatoduodenectomy (LPD) and Da Vinci robot assisted pancreatoduodenectomy (RPD) on the risk of pancreatic fistula in postoperative patients.Methods:The key words were laparoscopic, pancreaticoduodenectomy, robot, DaVinci, Whipple, complication, fistula, pancreaticoduodenectomy, laparoscopy, robot, postoperative complications and pancreatic fistula, and the databases of CNKI, Wanfang, VIP, CBM, Cochrane Library, PubMed, EMBASE and web of science were searched until August 1, 2020 for retrospective cohort studies and randomized controlled trials comparing the efficacy of OPD, LPD and RPD. The articles were screened according to the pre-set inclusion and exclusion criteria, and the quality of the articles was evaluated and the data were extracted. Based on Bayesian framework, R4.0.2, Revman 5.3 and Stata 16.0 software were used to analyze the extracted data for mesh meta analysis.Results:Thirty articles involving 3 428 patients were included, including 26 retrospective cohort studies and 4 randomized controlled studies. Mesh meta-analysis showed that in the incidence of pancreatic fistula, there was no significant difference between LPD and OPD, between LPD and RPD ( OR=0.93, 95% CI 0.63-1.4; OR=1.4, 95% CI 0.87-2.2, P<0.05), but the incidence of postoperative pancreatic fistula was significantly lower than that of OPD ( OR=1.5, 95% CI 1.1-2.1, P<0.05), 95% CI 1.12.1; P>0.05). The risk probability of pancreatic fistula was ranked as RPD (0.00), LPD(0.34) and OPD(0.65), that is, for the risk of postoperative pancreatic fistula, the advantages and disadvantages of the three surgical methods were ranked as RPD, LPD and OPD. Conclusions:Compared with OPD, RPD can significantly reduce the risk of pancreatic fistula after PD and improve the quality of operation; there was no significant difference between LPD and RPD in the incidence of postoperative pancreatic fistula, and both of them were safe and feasible.
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The SARS-CoV-2 has been spread to 26 countries around the world since its outbreak. By February 16, 2020, more than 68 000 people had been diagnosed with COVID-19. Researchers from all over the world have carried out timely studies on this public health emergency and produced a number of scientific publications. This review aims to re-analyze and summarize the current research findings in a timely manner to guide scholars in relevant fields to further SARS-CoV-2 research and assist healthcare professionals in their work and decision-making. The SARS-CoV-2 related terms were selected in both English and Chinese and were searched in several major databases, including Pubmed, Web of Science, CNKI, Wanfang, and VIP databases. The reference list of each search result was screened for relevance, which was further supplemented to the search results. The included studies were categorized by topics with key characteristics extracted, re-analyzed, and summarized. A total of 301 articles were finally included with 136 in Chinese and 165 in English. The number of publications has rapidly increased since mid-January, 2020, and a peak day was 6th February on which 50 articles were published. The top three countries publishing articles were China, the United States and the United Kingdom. The and its specialty journals have published the most articles, with contribution also from journals such as ( ), ( ), and . All articles were categorized into epidemiology, clinical diagnosis and treatment, basic research, pregnant women and children, mental health, epidemic prevention & control, and others. The literatures related to SARS-CoV-2 are emerging rapidly. It is necessary to sort out and summarize the research topic in time, which has a good reference value for staff in different positions. At the same time, it is necessary to strengthen the judgment of the quality of literatures.
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Humans , Betacoronavirus , Bibliometrics , Biomedical Research , China , Coronavirus Infections , Pandemics , Periodicals as Topic , Pneumonia, Viral , United Kingdom , United StatesABSTRACT
Objective:To investigate whether the squirrels in Yunnan Province carried Yersinia pestis phages and their epidemiological significance. Methods:From 2015 to 2018, plague host animals were investigated in five of Yunnan plague foci and non-plague foci. The spleen, liver and intestinal specimens of the squirrels captured in the investigation were taken and stored at low temperature for later use. Intestinal specimens with PBS solution, were filtered by 0.22 μm and added to LB liquid medium containing 100 μl suspension of plague vaccine strain (EV76) and then oscillated in a constant temperature gas bath at 28 ℃ and 220 r/min for 18 to 24 h. The double-layer plate method was used to isolate and observe the growth of plaque. The morphology and structure of Yersinia pestis phages were observed under electron microscope. Meanwhile, spleen, liver and intestinal specimens were taken for detection of Yersinia pestis specific marker gene caf1. Results:A total of 10 squirrels were captured (8 Callosciurus erythraeus and 2 Dremomys pernyi), and four Yersinia pestis phages were isolated (2 in Callosciurus erythraeus and 2 in Dremomys pernyi). Two were isolated from non-plague foci (Yongshan County), two from house rats plague foci (Mile County and Xinping County), and none was isolated from wild radents plague foci (Jianchuan County and Eryuan County). By naked eye observation, two bacteriophages from the plague foci produced transparent plaques and grew well, while two bacteriophages from non-plague foci produced translucent plaques and with poor growth. By electron microscopy, these Yersinia pestis phages were of typical Myoviridae family, their head diameter was about 40 nm, muscle tail was about 120 nm, and tail filament cluster was slightly visible at the end of muscle tail. And all the 10 samples of squirrels were negative of plague-specific caf1 gene. Conclusions:The proportion of plague phages carried by Yunnan squirrels is relatively high. Although the detection of caf1 is negative. Squirrels may be a carrier of plague transmission due to the existence of Yersinia pestis phages.
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Objective To establish a real-time quantitative PCR (RT-PCR) preliminary screening method for rapid detection of Brucella.Methods Based on the nucleotide sequence encoding Brucella's outer membrane proteins omp10 and omp31,four primers and probes of omp10,omp10-1,omp31 and omp31-1 were designed.The primers and probes were used to detect 19 strains of 6 categories of Brucella DNA of known organisms,10 strains of Brucella DNA that were isolated from Yuxi of Yunnan.And 224 negative Brucella DNA,including 35 strains of Bartonella DNA,103 strains of the Lord Komori enterocolitis DNA (including 4 parts of O ∶ 3 and 9 parts of O ∶ 9) and 86 samples of hybrids bacteria DNA.Then the specificity of primers and probes were evaluated based on the test results.Results The DNA of 19 standard Brucella strains could be amplified by omp10 and omp10-1,and the peak time and amplification curve of omp10 is better than omp10-1,and the DNA of negative control strains could not be amplified by omp10.The DNA of 16 standard Brucella strains could be amplified by omp31-1.The DNA of standard Brucella strains could not be amplified by omp31.The average Ct values of 10 strains of Brucella DNA which were isolated from Yuxi of Yunnan that were detected by omp10,omp10-1 and omp31-1 respectively were 19.87,19.14 and 17.52.Conclusion Omp10 has strong specificity and only specific for Brucella,so it can be used for rapid detection of Brucella.
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Objective To investigate whether the host animals of Yulong plague foci carry Yersiniapestis phage,and to identify isolated plague phage.Methods Rodent specimens were collected in 5 villages of Yulong plague foci in spring and autumn of 2016,respectively.Vaccine strain EV76 was used as breeding bacteria.Phage was isolated from the specimens by double-layer plate method and plaque morphology was identified.Results ① Totally 409 samples collected in spring failed in phage isolation.A total of 40 of Yersinia pestis phages were isolated from 444 samples in autumn,and the total isolation rate was 9.01％ (40/444).② The Yersinia pestis phages were isolated in all of 5 villages,and the isolation rate was of no significant difference (x2 =5.055,P ＞ 0.05).③ Of the 40 strains of phage,37 strains were isolated from Apodemus chevrieri,2 strains from Eothenomys Miletus and 1 strain from Crocidura Dracula.④Based on the appearance,the plaque of the phage was divided into three:large (diameter 1.5-2.5 mm),middle (0.5-＜ 1.5 mm) and small (＜ 0.5 mm).Conclusion There is a higher number of plague phage in the host animals of the plague foci in Yulong County of Yunnan Province,the plaques are diverse in morphology,and their biological characteristics may be polymorphic.
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Objective To identify the causes of nonspecific bands in the detection of a industry standard caf1 gene by polymerase chain reaction(PCR),and to propose a solution to this problem. Methods A total of 112 strains were selected for the experiment, including 40 strains of Yersinia pestis, 72 strains of non-Yersinia pestis;DNA was extracted,and caf1 gene was amplified by PCR;seven non-specific strips were recovered,purified and TA cloning and sequencing; the primer of the caf1 gene was redesigned and validated using all of the strains. Results Using the industry standard caf1 gene primer,DNAs of 40 Yersinia pestis and 72 non-Yersinia pestis were amplified by PCR, 58 non-Yersinia pestis could be amplified with non-specific bands, they were about 400, 500, 600, 700, 800, 900, 1 000 bp. By TA cloning and sequencing, the non-specific bands in the downstream of the industry standard caf1 primer and its reverse complement were amplified. Using the new designed caf1 primer to amplify, 72 non-Yersinia pestis strains showed no non-specific bands. Conclusion Non-specific bands has been amplified in the screening of Yersinia pestis using the primer of the industry standard caf1, and the new caf1 primer can effectively avoid this problem and improve the accuracy of detection.
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Objective To quantify any therapeutic effect of cyclic movement training combined with functional electrical stimulation for improving lower limb motor function and ability in the activities of daily life after stroke.Methods Seventy stroke survivors were randomly divided into a control group and an experimental group,each of 35.Both groups were given conventional rehabilitation,including cyclic training,but the experimental group was additionally provided with functional electrical stimulation of the quadriceps,hamstrings,anterior tibialis and gastrocnemius at the affected side.Before and after four weeks of treatment the Fugl-Meyer lower limb (FMA-L) and balance (FMA-B) assessments were performed and a modified Barthel index (MBI) was assigned to each subject to quantify functioning.Results Before the treatment,no significant differences were observed between the two groups in any of the measurements.But after four weeks of treatment the average FMA-L,FMA-B and MBI scores of the experimental group were all significantly better than before the treatment and significantly better than the control group's averages.Conclusion Cyclic movement training combined with functional electrical stimulation can improve the lower limb motor function of stroke survivors and their ability in the activities of daily life.
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Objective To explore the changes of urine albumin-creatinine ratio ( ACR) and urina-ry podocalyxin (PCX) and the relationship of score of Montreal cognitive assessment (MoCA) with urine ACR and PCX in patients with type 2 diabetic mild cognitive impairment. Methods Sixty patients with type 2 diabetes mellitus were used as the control group, and 60 patients with type 2 diabetic mild cognitive impairment as the mild cognitive impairment ( MCI) group. The sex, age, and course of disease and years of education of patients were recorded, the fasting plasma glucose (FPG), hemoglobin A1c (HbA1c), sys-tolic blood pressure ( SBP) , diastolic blood pressure ( DBP) , triglyceride ( TG) , total cholesterol ( TC) , low density lipoprotein ( LDL) , high-density lipoprotein ( HDL) , and urine ACR and PCX were measured, and the score of MoCA was assessed. Results The patients with type 2 diabetic nephropathy in the MCI group were significantly more than the control group (χ2 =73. 818,P<0. 01). The score of MoCA of the MCI group was significantly lower than the control group (P<0. 01), while urine ACR and PCX were high-er than the control group (P<0. 01). The score of MoCA was inversely associated with the urine ACR (r=-0. 868,P<0. 01) and PCX (r= -0. 785,P<0. 01), and those were the independent risk factors for the score of MoCA ( P<0. 01 ) . Conclusions The urine ACR and PCX were closely related to the cognitive function of type 2 diabetes mellitus, which can be used as the screening indexes of type 2 diabetic mild cog-nitive impairment.
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Objective To probe the clinical value of three-dimensional speckle tracking echocardiography in evaluating the early ventricular myocardial dysfunction in breast cancer patients treated with anthracycline.Methods A group of 40 breast cancer postoperative patients were received a epirubicin-based chemotherapy.Conventional and 3D dynamic echocardiography were measured before chemotherapy and 2 cycles and 4 cycles after chemotherapy during 24 hours,and to compare the change of the parameters before and after the chemotherapy.Results Left ventricular global area strain(LVGAS),left ventricular global longitudinal strain(LVGLS),right ventricular global longitudinal strain(RVGLS),right ventricular global circular strain(RVGCS) and right ventricular global radial strain(RVGRS) were significantly lower after the chemotherapy than those before the chemotherapy,and negatively correlated to cumulative anthracycline dose,in which the area under the ROC curve of LVGAS was 0.897(P = 0.000).If-30.55% was selected as the diagnosis cut-off point,the sensitivity was 0.857,and the specificity was 0.917;some of right ventricular strain parameters were earlier than those of the left.Conclusions 3D-STI is useful to find the early left and right ventricular myocardial dysfunction in breast cancer patients treated with anthracycline and early access the subclinical cardiactoxicity,and right ventricular dysfunction may emerge earlier than the left,which can provide diagnosis basis to intervene timely for the clinical.
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Hereditary spastic paraplegia is a heterogeneous group of genetic neurodegenerative disorders of the nervous system. It is classified into four subtypes based on the mode of inheritance; and among them, most autosomal recessive hereditary spastic paraplegia cases are due to type SPG11 and SPG15 gene mutations. Autosomal recessive hereditary spastic paraplegia cases with SPG30 gene mutation have never been reported in China. Herein, we present our experience with a case of hereditary spastic paraplegia with SPG30 gene mutation in our hospital from North East China. In this patient we detected a missense mutation of c.499 C>T (p.Arg167Cys) in gene KIF1A, a causative gene of type SPG30.
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Objective To quantify any therapeutic effect of cyclic movement training combined with functional electrical stimulation for improving lower limb motor function and ability in the activities of daily life after stroke.Methods Seventy stroke survivors were randomly divided into a control group and an experimental group,each of 35.Both groups were given conventional rehabilitation,including cyclic training,but the experimental group was additionally provided with functional electrical stimulation of the quadriceps,hamstrings,anterior tibialis and gastrocnemius at the affected side.Before and after four weeks of treatment the Fugl-Meyer lower limb (FMA-L) and balance (FMA-B) assessments were performed and a modified Barthel index (MBI) was assigned to each subject to quantify functioning.Results Before the treatment,no significant differences were observed between the two groups in any of the measurements.But after four weeks of treatment the average FMA-L,FMA-B and MBI scores of the experimental group were all significantly better than before the treatment and significantly better than the control group's averages.Conclusion Cyclic movement training combined with functional electrical stimulation can improve the lower limb motor function of stroke survivors and their ability in the activities of daily life.
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Objective To investigate the change of urinary podocalyxin(PCX) and vascular endothelial growth factor (VEGF) levels and its association with the oxidative stress in the patients with type 2 diabetes mellitus(T2DM ) complicating dif‐ferent degrees of diabetic nephropathy .Methods Totally 186 patients with T2DM were divided into the pure T2DM (SDM ,62 ca‐ses) ,trace amount group(NA group ,60 cases) and massive amount group(MA group ,64 cases) according to the 24 h urinary albu‐min excretion rate(UAER) .60 cases of normal 24 h UAER were taken as the control group(NC group) .The levels of PCX ,VEGF , superoxide dismutase (SOD) ,malondialdehyde(MDA) and glutathione peroxidase (GSH‐px)were determined .Results Compared with other three groups ,the level of VEGF ,PCX and MDA in the MA group were highest(P<0 .01) ,while the levels of SOD and GSH‐px were lowest(P<0 .01 ,P<0 .05) .VEGF ,UAER ,HbA1c were the independent risk factors for urinary PCX .Conclusion In patients with diabetic nephropathy ,urinary PCX and VEGF are correlated with the oxidative stress ,while the oxidative stress is closely correlated with glomerular podocyte injury .
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Human leukocyte antigen G ( HLA-G) is a member of the non-classical HLA classⅠb family. It is considered to play a crucial role in immune tolerance. A unique feature of HLA-G is the struc-tural diversity as surface expressed and as secreted molecules, which is mainly attributed to alternative spli-cing of the primary transcript. HLA-G can promote the invasion and metastasis of tumor cells through various ways. In addition, HLA-G has been described included in exosomes. Exosomes released by most cell types are nano-sized vesicular bodies that contain lipid bilayer and rich contents. As a new marker for diseases, exosomes are extensively involved in the occurrence and development of diseases. Recent studies have found that exosomes can express soluble HLA-G, which reveal a new way by which HLA-G regulates tumor micro-environment. In this review, we focus on the expression of HLA-G on exosomes to provide new thoughts for the early detection and treatment of tumors.
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Objective:To study the application of HL-60 monocyte activation test in the pyrogen detection of vaccines. Methods:HL-60 cells were incubated with the standard pyrogen(endotoxin,zymosan and lipoteichoic acid)solution and the sample solution at different concentrations,and then IL-6 level was detected using ELISA kit. According to the concentration of standard pyrogen solution and the level of IL-6,the standard curve and linear relationship were obtained. Based on the IL-6 value from the sample solution,the pyrogen content of the sample was calculated. The standard pyrogen solution at middle concentration of the standard curve was used as the interference sample,and the interference assay was performed referring to the bacterial endotoxin test in Chinese pharmacopoeia. The pyrogen recovery rate and the content were detected using HL-60 / IL-6 assay in seven kinds of vaccines such as influenza vaccine(Split Virion),inactivated;hepatitis A(live)vaccine,freeze-dried;rabies vaccine(Vero Cell)for human use,freeze-dried;lyophilized human measles and rubella combined vaccine,live;measles and mumps combined vaccine, live; haemorrhagic fever with renal syndrome bivalent vaccine, inactived; group A and C meningococcal polysaccharide vaccine. Results:① The linear relationship between the pyrogen concentration and the IL-6 level was good,and R2 value was 0. 996,0. 993 and 0. 997,respectively. ② The recovery rate of pyrogen in the above vaccines ranged from 50% to 200% . ③ The endotoxin concentration of 10 batches of group A and C meningococcal polysaccharide vaccine was detected using HL-60 / IL-6 assay,and the average value of 6 batches from factory A was 134. 73 EU·ml-1 ,and that of 4 batches from factory B was 40. 75 EU·ml -1 . The pyrogen in the other vaccines was all negative. Conclusion:The HL-60 / IL-6 assay is suitable for the pyrogen detection of the seven kinds of vaccines.
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Objective Using quantitative real-time PCR to establish a rapid specific genetic diagnostic technique for Yersinia pestis.Methods ①Four sets of specific probes and primers were designed,which targeted to chromosome genes of YPO0392,YPO1094,YPO2087 and YPO2090,respectively.②The probes and primers were tested for stability and specificity with 40 strains of Yersinia pestis and 47 strains of non-Yersinia pestis of different sources in Yunnan.③Eight positive DNA in Yulong,Yunnan,were tested with the screened probes and primers.Results ①Two sets probes and primers were selected,they were targeting YPO0392 and YPO1094,respectively.②The results were all positive of the eight positive DNA samples tested.Conclusion Two sets of primers and probes are selected for rapid specific diagnosis of Yersinia pestis.
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Objective To investigate the comparability of K + ,Na+ and Cl- measurement between Cobas8000 analyzer and AU640 analyzer .Methods According to the EP9‐A2 document of the National Committee for Clinical Laboratory Standards ,the precision of AU640 analyzer for the detection of K + ,Na+ and Cl- was evaluated ,and the correlation between the detected results of the two analyzers were also analyzed .Results AU640 analyzer were with high precision for the detection of K + ,Na+ and Cl- ,in‐tra‐assay and inter‐assay coefficient of variation of which were both less than 2% .The correlation coefficients of the two analyzers were higher than 0 .975 .Conclusion Cobas8000 analyzer and AU640 analyzer might be with fine comparability for the detection of K+ 、Na+ and Cl- ,both of which could provide accurate detected results .
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Objective To investigate the relationship between polymorphisms of gene promoter region INS 5′UTR single nu-cleotide and type 2 diabetes and serum IAA-Ab levels.Methods By Sequenom MassArray SNP genotyping detection technology, INS 3 pyomter regime single nucleotide polymorphisms (rs689,rs714641 77 and rs3842738)of 497 patients in Chongqing with type 2 diabetes cases(treatment group)and 500 cases(control group)were genotyped and analyzed.IAA-Ab levels in diabetes patients was detected.Theχ2 test statistic was used to analyze the treatment group and control groups.The genotype frequency distribution of IAA-Ab-positive and negative groups SNP was analyzed by non-conditional logistic regression,adjusted for sex,age impact,cal-culated the odds ratio (OR)and 95 % confidence interval(CI ).The polymorphic loci with type 2 diabetes susceptibility and serum GAD-Ab levels was evaluated.Results The genotype frequency distribution of rs689AA,TT and AT was 58.75%,28.77% and 12.47%,respectively.The control group are 50.40%,35.60% and 14.00% respectively.The difference was statistically significant (χ2 =3.923,P <0.05).Compared with the genotype of AA,TT genotype can decrease risky of diabetes,with OR values 0.35(95%CI :0.18-1.06).There was significant difference of AA,TT,AT genotypes between IAA-Ab negative and IAA-Ab positive pa-tients (P < 0.05 ).Conclusion INS polymorphisms might be related to the risky of type 2 diabetes and serum IAA-Ab level in chinses population.
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<p><b>OBJECTIVE</b>To create the fingerprint library of Yunnan Yersinia pestis by pulse field gel electrophoresis(PFGE)with Fse I enzyme digestion method and to study its epidemiological significance.</p><p><b>METHODS</b>We used rare cutting restriction enzyme Fse? to digest Yunnan Yersinia pestis strains that were isolated from foci including Rattus flavipectus Plague Focus,Apodemus chevrieri-Eothenomys miletus Plague Focus and Yulong Plague Focus. Fingerprints to Bionumerics software were used for cluster analysis.</p><p><b>RESULTS</b>30 tested strains were divided into 16 genotypes with the similarity value as 79.8%-100.0% . 16 genotypes wee formed into 4 clusters, with one consisted of only EV76 while the other three belonged to Rattus flavipectus,Apodemus chevrieri- Eothenomys miletus and Yulong clusters, respectively.</p><p><b>CONCLUSIONS</b>PFGE genotypes of Yunnan Yersinia pestis accorded with its ecotypes and biovars, with clustered regional features. The strains isolated from Yulong showed an unique PFGE type, indicating a new clone group was identified.</p>
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Animals , Humans , Rats , China , Epidemiology , Cluster Analysis , Electrophoresis, Gel, Pulsed-Field , Genotype , Phylogeny , Plague , Epidemiology , Yersinia pestis , GeneticsABSTRACT
Objective To explore the relationship among the left ventricular rotation and twist, Tei index and left ventricular function in chronic heart failure patients and provide reliable indicator of chronic heart left ventricular myocardial function and mechanical movement. Methods Seventy-nine chronic heart failure patients with cardiac function classⅡ(32 cases), cardiac function classⅢ(26 cases) and cardiac function classⅣ(21 cases) and 28 healthy volunteer were included. All subjects underwent conventional echocardiography and two dimensional-speckle tracking imaging. The mitral annulus tissue Doppler spectrums at apical four chambers view, two-dimensional images of left ventricle at basal and apical level were acquired. The left ventricular twist, segmental rotation at short axis view and Tei index were measured. The differences were compared and the correlations were analyzed. Results (1) There were signiifcant differences for Tei index among the four group (χ2=88.31, P<0.01). The Tei index of healthy control group and chronic heart failure patients with cardiac function class Ⅱ , class Ⅲand class Ⅳwere 0.33±0.19, 0.37±0.18, 0.46±0.31 and 0.49±0.33. The Tei index gradually increased when the heart function decreased. (2) The left ventricular twist were also signiifcantly different among the four groups (F=25.99, P<0.01). The left ventricular twist of healthy control group and chronic heart failure patients with cardiac function classⅡ, classⅢ and classⅣwere (12.89±2.65)°, (12.29±1.94)°, (12.38±2.13)° and (8.46±2.90)°. The left ventricular twist gradually decreased when the heart function decreased. The differences between chronic heart failure patients with cardiac function classⅣand healthy control group, chronic heart failure patients with cardiac function classⅡand classⅢwere signiifcant (q=6.43, 5.71 and 4.17, all P<0.05). (3) The left ventricular segmental rotations at basal level were significantly different among healthy control group and chronic heart failure patients with cardiac function classⅡ,ⅢandⅣ(F=9.51, 9.47, 7.41, 10.27, 9.42 and 11.34, all P<0.01 ). The left ventricular segmental rotations were positively correlated with Tei index and the segmental rotation of anterior wall was most correlated with Tei index (r=0.327, 0.277, 0.266, 0.321, 0.306 and 0.325, all P<0.01). (4) The left ventricular segmental rotations at apical level were signiifcantly different among four groups (F=6.17, 3.49, 3.46, 3.50, 3.48 and 2.81, all P<0.01). The left ventricular segmental rotations were negatively correlated with Tei index and the segmental rotation of anterior wall was most correlated with Tei index (r=-0.362,-0.278,-0.251,-0.279,-0.290 and-0.288, all P<0.01). (5) The left ventricular twist and Tei index were negatively correlated (r=-0.443, P<0.01). Conclusions The left ventricular twist and segmental rotation at short axis view in patients with chronic heart failure decreased and Tei index gradually increased. The left ventricular twist and Tei index were negatively correlated. The combination of two-dimensional speckle tracking technology and Tei index could achieve noninvasive assessment of left ventricular mechanical movement and left heart function in chronic heart failure patients.