Long COVID outcomes following omicron wave in non-hospital population.

Background: The persistence of symptoms or the development of new symptoms following a diagnosis of SARS-CoV-2 has given rise to a multifaceted clinical condition referred to as "long COVID" (LC). The understanding of LC among China's non-hospitalized population continues to be insufficient. This investigation was designed to evaluate the protracted consequences amongst this demographic, as well as to identify the associated risk factors. Methods: This research constitutes a prospective cohort study focusing on non-hospitalized individuals, aged between 18 and 59, who have been positively diagnosed with COVID-19. Each participant was subjected to a sequence of questionnaire-based surveys, designed to evaluate symptoms as well as the status of depression and anxiety. A logistic regression model, adjusted for multiple variables, was employed to scrutinize the correlation between demographic elements, lifestyle attributes, and health-related risk factors in relation to conditions and symptoms post COVID-19 infection. Results: A total of 706 individuals participated in the 3 months follow-up, with 620 continuing on to the 6 months follow-up. The median age was 35 (28, 43) years, and 597 (85%) are female. Upon follow-up, Compared with patients without LC, patients with LC have a higher proportion of females (420 (87%) vs. 177 (79%); p = 0.010), were older (35 (29, 44) years vs. 33 (27, 41) years; p = 0.010) and have more comorbidities. Out of all participants, 483 (68.4%) reported experiencing at least one symptom at the 3 months mark, while 49.7% reported symptoms persisting at the 6 months mark. At the 3 months follow-up, the most prevalent persistent symptoms were cough (46%), fatigue (38%), and shortness of breath (34%). By the 6 months follow-up, fatigue (25%), shortness of breath (22%), and sleep disorders (16%) were the most commonly reported symptoms. Anxiety and depression were consistently reported as prevalent symptoms throughout the follow-up period. Most patient symptoms fade over time, with the quickest decreases observed in cough (from 46 to 9%), expectoration (from 26 to 6.3%), smell disorder (from 16 to 3.9%), and taste disorder (from 18 to 3.5%). Male and those possessing advanced educational qualifications exhibit a decreased susceptibility to the sustained incidence of coughing. Conversely, older age and the presence of comorbidities were identified as risk factors for persistent fatigue and shortness of breath. Conclusion: In the after of COVID-19, it has been observed that the majority of patient symptoms tend to decrease over time. The primary residual symptoms noticed after a 6 month follow-up were fatigue, dyspnea, and sleep disturbances. However, it's noteworthy that the risk factors associated with these symptoms exhibit subtle variations. Furthermore, psychological sequelae, namely depression and anxiety, are frequently reported among COVID-19 survivors.

Influencing factors of caries among Tibetan primary school studentsin Maqu County / 预防医学

Objective@# To investigate the prevalence and influencing factors of caries among Tibetan primary school students in Maqu County, Gansu Province, so as to provide insights into caries control among children living in ethnic minority areas.@*Methods@# Tibetan primary school students at grades three to six were sampled from two primary schools in Maqu County using a multi-stage cluster sampling method. Primary school students' demographics, dietary habits and oral health habits were collected using questionnaire surveys, and the caries was tested. Factors affecting the development of caries were identified using a multivariable Poisson regression model.@*Results@# A total of 378 Tibetan primary school students were tested, and there were 334 students with caries, with a caries prevalence rate of 86.30%, and a mean caries number of (4.72±2.69) teeth. Multivariable Poisson regression analysis showed that grade (grade 5, IRR=0.791, 95%CI: 0.706-0.886; grade 6, IRR=0.698, 95%CI: 0.593-0.822), frequency of vegetable intake (less than once daily, IRR=0.872, 95%CI: 0.778-0.978; once daily, IRR=0.769, 95%CI: 0.677-0.873; twice and more daily, IRR=0.571, 95%CI: 0.469-0.696), frequency of tooth brushing (once daily, IRR=0.814, 95%CI: 0.734-0.904; twice and more daily, IRR=0.606, 95%CI: 0.521-0.703) and frequency of oral examinations (IRR=0.736, 95%CI: 0.594-0.911) were influencing factors of caries. @*Conclusion @#The prevalence of caries is 86.30% among Tibetan primary school students at grades 3 to 6 in Maqu County, and age, dietary habit and oral health habit are factors affecting the development of caries.

Expression of thyroglobulin and thyroid peroxidase in pregnant and lactating rats / 中华地方病学杂志

Objective To observe the mRNA and protein expression of thyroglobulin (Tg) and thyroid peroxidase (TPO) in each trimester of pregnant and lactating Wistar rats.Methods Ninety-six SPFNAF Wistar rats (84 female and 12 male),weighting 220-260 g were involved.All female Wistar rats were randomly divided into 7 groups according to their body mass via the random number table method:control group,early pregnancy group (7 d),midpregnancy group (14 d),late pregnancy group (21 d),early lactation group (7 d),midlactation group (14 d) and late lactation group (21 d),12 rats in each group.The rats were fed with conventional feed and drank deionized water freely.Female rats of the last 6 groups were mated with male rats.Thyroids were collected on the 7 d,14 d and 21 d of their pregnancy and lactation,respectively.The mRNA expression levels of Tg and TPO were detected by quantitative real-time PCR,and the protein expression levels of Tg and TPO were detected by Western blotting.Results The expression levels of Tg mRNA in thyroid tissue in the control group,early,middle and late pregnancy and early,middle and late lactation (1.05 ± 0.01,3.20 ± 0.23,1.88 ± 0.12,2.69 ± 0.20,1.53 ± 0.19,2.37 ± 0.31,2.23 ± 0.12) were significantly different between groups (F =42.864,P ＜ 0.05),and those of pregnancy and lactation groups were higher than those in the control group (P ＜ 0.05).The expression levels of Tg protein were 0.15 ± 0.01,0.38 ± 0.01,0.32 ± 0.02,0.37 ± 0.01,0.21 ± 0.01,0.35 ± 0.01,0.44 ± 0.01,respectively.The differences between groups were statistically significant (F =232.250,P ＜ 0.05).And those of pregnancy and lactation groups were higher than those in the control group (P ＜ 0.05).The expression levels of TPO mRNA in thyroid tissue in the control group,early,middle and late pregnancy and early,middle and late lactation (0.57 ± 0.01,0.74 ± 0.03,0.78 ± 0.13,1.08 ± 0.10,0.98 ± 0.10,1.00 ± 0.07,0.76 ± 0.05) were significantly different between groups (F =15.448,P ＜ 0.05).And those of pregnancy and lactation groups were higher than those in the control group (P ＜ 0.05).The expression of TPO protein were 0.23 ± 0.01,0.41 ± 0.01,0.72 ± 0.02,0.78 ± 0.01,0.49 ± 0.01,0.52 ± 0.01,0.45 ± 0.02,respectively.The differences between groups were statistically significant (F =563.692,P ＜ 0.05).And those of pregnancy and lactation groups were higher than those in the control group (P ＜ 0.05).Conclusions The mRNA and protein expression levels of TPO and Tg have increased in pregnant and lactating rats.This performance may be raleted to thyroid hormone deficiency and mild hypothyroidism.

A study on the relationship between intrauterine infection and early-onset neonatal sepsis / 中国新生儿科杂志

Objective To study the relationship between intrauterine infection and early neonatal sepsis.Method From October 2015 to September 2016,the clinical data of pregnant mothers and their newborns in Shenzhen Longhua District Central Hospital were collected,and data of Shenzhen People's Hospital from January 2016 to June 2016 were collected.100 pairs of pregnant mothers and their newborns with confirmed or suspected intrauterine infection were selected as the observation group,and another 100 pairs without intrauterine infection during the same period as the control group.The ratio of term infants vs.premature infants was 1∶ 1.The complete blood count (CBC),CD64,procalcitonin (PCT) and C-reactive protein (CRP) were measured in peripheral blood of all mothers on the day of delivery.The CBC,CD64,CRP,PCT,blood culture of both umbilical venous blood and peripheral blood in neonates were examined and the pathological examination of placenta was performed.Result The positive rate of placental pathology and umbilical cord blood culture in observation group were significantly higher than that in the control and the positive rate in preterms was higher than the terms in observation group (P ＜ 0.05).No significant differences existed between term and premature newborns on the positive rate of peripheral blood culture (P ＞ 0.05).The positive rate of blood culture from umbilical cord blood was higher than peripheral blood in observation group (P ＜ 0.05),but no significant difference in control group (P ＞ 0.05).The incidence of septicemia in term and premature newborns in observation group was significantly higher than the control group (P＜ 0.05).The CD64,PCT in mother's peripheral blood and umbilical cord blood,and CRP in mother's blood were all higher than the control group,the differences were statistically significant (P ＜ 0.05),but CRP in umbilical cord blood in both group were similar (P ＞ 0.05).The area under ROC curve of CD64 and PCT in mother's peripheral blood,CD64 and PCT in umbilical cord blood to diagnose early-onset septicemia in newborns was 0.755,0.793,0.852 and 0.811,respectively.Conclusion The risk of neonatal infections is significantly increased because of intrauterine infection.Combination of peripheral and umbilical blood cultures can increase the accuracy of sepsis diagnosis.Both CD64 and PCT in umbilical cord blood and maternal blood can be used as indicators of intrauterine infection with a predictive value in the diagnosis of early-onset neonatal sepsis.

Effect of acupuncture and tuina plus rehabilitative therapy on lower limb motor dysfunction in infants with spastic cerebral palsy / 针灸推拿医学（英文版）

Objective: To observe the effect of acupuncture, tuina plus rehabilitative therapy on lower limb motor dysfunction in infants with spastic cerebral palsy. Methods:A total of 60 infants with spastic cerebral palsy were randomly divided into a treatment group and a control group by random digital table, 30 cases in each group. The treatment group was treated with acupuncture, tuina therapy plus rehabilitative therapy of Western medicine. The control group was simply treated with rehabilitative therapy of Western medicine, as same as that for the treatment group. The assessment was respectively given to the sick infants before the treatment and after the treatment of six months, to evaluate lying and rolling scores in dimension A, to evaluate sitting score in dimension B, to evaluate crawling and kneeling scores in dimension C, and evaluate standing score in dimension D in the gross motor functions and determine the muscle tone of the gastrocnemius muscle by modified Ashworth scale (MAS). Results:The differences were not statistically significant in comparison of the gross motor functions and the muscle tone of the gastrocnemius muscle between the two groups of sick infants before the treatment (P>0.05); after the treatment of six months, the above items were obviously improved in the two groups (P Conclusion:Acupuncture, tuina plus rehabilitative therapy of Western medicine are remarkable in the therapeutic effects in the treatment of motor disorders of the lower limbs in the sick infants with spastic cerebral palsy. This therapeutic method is safe, simple and convenient and needs to be clinically popularized and applied.

Comparison of orthotropic models of RET/PTC1 rearrangement and BRAFV600E mutation papillary thyroid cancer cell lines in nude mice / 中华内分泌代谢杂志

Objective To observe and compare the different orthotopic models of papillary thyroid cancer ( PTC) cell lines of RET/PTC1 rearrangement and BRAFV600E mutation in nude mice. Methods Human PTC cell lines TPC-1, BHP5-16 and BHP2-7 were used. The genotypes of RET/PTC1 rearrangement and BRAFV600E mutation were determined by realtime-PCR and DNA sequencing analysis. The cells(2×105) were injected into the thyroid gland of nude mice. The nude mice were executed at 4th, 12th week, and then their thyroid tumors were removed and weighed. The levels of thyroid hormone were detected using chemiluminescent immunoassay. Results Both TPC-1 and BHP2-7 cells were identified as RET/PTC1 rearrangement by real time-PCR, and the expression of RET/PTC1 rearrangement in BHP2-7 cell was higher than that of TPC-1 cell. BRAFV600E mutation was found in BHP5-16 cell by DNA sequencing analysis, but was not found in TPC-1 and BHP2-7 cells. There were different characteristics in three orthotopic nude model groups. Tumorigenic rates of TPC-1 and BHP5-16 groups were 100%, but the growth of tumor was more rapid in BHP5-16 group than that in TPC-1 group, with more weight tumor. The changes of thyroid hormone levels in BHP5-16 group and TPC-1 group were the same, which were normal at 4th week and sharply decreased at 12 th week(P0. 05). Conclusions It showed difference in the orthotopic models of PTC cell lines of RET/PTC1 rearrangement and BRAFV600E mutation in nude mice. BRAFV600E mutation has obvious impacts on increasing tumorigenic rate and promotion of tumor growth in the orthotopic model. It should not be ignored that advanced thyroid tumor will lead to the destruction of thyroid function.

Clinical Observation of Chinese Herbal Fumigation plus Mulberry Stick Beating for Heel Pain / 针灸推拿医学（英文版）

Objective:To observe the clinical efficacy of Chinese herbal fumigation plus beating with mulberry stick in treating heel pain. Methods: Sixty patients with heel pain were randomized into a treatment group and a control group, 30 in each group. The treatment group was intervened by Chinese herbal fumigation plus beating with mulberry stick, and the control group was by orally taking Diclofenac Sodium Sustained Release Tablets plus external use of She Xiang Zhen Tong Gao (Moschus Analgesic Plaster). After one treatment course, the visual analogue scale (VAS) was used to observe the change of pain, and the clinical efficacies were also evaluated. Results: After intervention, the improvement of VAS score in the treatment group was more significant than that in the control group (P Conclusion:Chinese herbal fumigation plus beating with mulberry stick can produce a higher clinical efficacy than orally taking Diclofenac Sodium Sustained Release Tablets in treating heel pain.

Effects of iodine intake on the orthotopic nude mouse model of human papillary thyroid carcinoma cell line TPC-1 / 中华内分泌代谢杂志

Objective To observe the effects of different iodine intake on the thyroid tumor growth and thyroid function in the orthotopic nude mice model of human papillary thyroid carcinoma (PTC) cell line TPC-1.Methods Human PTC cell line TPC-1 (2 × 105) was injected into the left thyroid gland of nude mice.After the operation,the nude mice were randomly divided into three groups:low iodine group (LI),normal iodine group (NI),and high iodine group(HI,50 folds of normal iodine) based on the iodine levels contained in their diet.4 and 12 weeks later,the nude mice were executed,then their thyroid tumors were removed and weighted.The levels of urinary iodine were measured with As3+-Ce4+ catalytic spectrophotometry using ammonium persulfate digestion method.The thyroid hormone level was detected using chemiluminescent immunoassay.The morphology and structure of thyroid tumor tissue was observed by microscope.Results The iodine intervention feeding was successful according to urinary iodine level of LI,NI,and HI groups,paralleled to their iodine intakes.However,the difference of the weight of thyroid tumor in three groups had no statistical significance(P＞0.05).At 4 weeks,compared with control group,the levels of thyroid hormones were normal in NI group,while lower T4 and normal T3 were found in LI group.However,T4 was higher and T3 was lower in HI group (P＜0.05).At 12 weeks,the levels of thyroid hormones all were decreased due to the enlargement of thyroid gland tumor in NI,LI and HI groups.T4 and T3 in LI group were the lowest among three groups,even T4 was below detection limit.T4 was normal and T3 was lower in HI group as compared to control group.Conclusion Iodine intake may not significantly affect tumor growth in the orthotopic nude mice model of human PTC cell line TPC-1,but it has a significant effect on the synthesis of thyroid hormones.

Reference range for thyroid function indices of 8-10 years old school children in certain regions of China / 中华内分泌代谢杂志

Objective To set up the reference range for thyroid hormones and thyrotropin (TSH) of 8-10 years old school children in certain regions of China to provide reference criteria for diagnosis,treatment,and monitoring of thyroid diseases and related research.Methods A cross-sectional survey was conducted in primary school children aged 8-10 years from six iodine sufficient areas.664 normal school children were selected for establishing reference ranges of thyroid hormones and TSH after crucial screening through questionnaire and laboratory investigation.The serum hormone levels were determined by using chemiluminescent immunoassay (Bayer's reagents),and the reference range of each hormone was displayed as its 95％ central interval.Results The reference ranges of TSH,FT4,FT3,TT4,and TT3 were 1.03-8.42 mIU/L,13.44-20.59 pmol/L,4.75-6.96pmol/L,75.29-152.66 nmol/L,and 1.76-3.35 nmol/L,respectively.There was no significant difference in hormone levels between boys and girls.The eight years old group had slightly higher TT4 level compared with the other age groups.The rural children had higher TSH and TT3 levels and lower FT4 level than the urban children.Conclusion The thyroid hormone and TSH levels are substantially different between school children and adults.Therefore,it is necessary to establish the reference range of thyroid function indices for normal school children in order to diagnose,treat,and monitor thyroid diseases.

The relationship between thyroid autoantibodies and thyroid function in different populations / 中华内分泌代谢杂志

To explore the relationship between thyroid autoantibodies and thyroid function in school children aged 8-10 years,adults,pregnant women,and lactating women in China,in order to provide reference for the prevention and monitoring of thyroid disease.Healthy 8-10 years old school children (693 cases),adults (698 cases),pregnant women(325 cases),and lactating women(332 cases) from six iodine sufficient areas were enrolled.Serum TSH,FT4,and FT3 were determined by chemiluminescent immunoassay,while antithyroid antibody by radioimmunoassay.The positive rate of thyroid autoantibodies in females was significantly higher than that in the male (5.6％ vs 2.0％ in school children,and 22.8％ vs 3.2％ in adults) ; while positive rate of autoantibodies in pregnant and lactating women (8.9％,8.7％) were significantly lower than that in the other healthy adult women (22.8％).The incidence of abnormal thyroid function in antibody-positive people was higher than that in negative ones in all groups,and abnormal thyroid function showed mainly as subclinical hypothyroidism.In addition,lactating women with negative autoantibodies presented a higher incidence of abnormal thyroid function,mainly as low FT4.The abnormal thyroid function is related with the positive thyroid autoantibodies,indicating that it is essential to follow-up these people with positive antibodies in order to facilitate prevention,early diagnosis,and treatment of thyroid disease.Reference data for thyroid hormones in lactating women should be establisbed as soon as possible.

Time and risk factors for spontaneous closure of patent ductus arteriosus in preterm infants / 中华围产医学杂志

Objective To investigate the time and risk factors for spontaneous closure of patent ductus arteriosus (PDA) in preterm infants. Methods One hundred and seventy-seven preterm infants with arterial ductus unclosed were divided into three groups according to their gestational age as 28-31+6 weeks group (n=44),32-34+6 weeks group (n=59) and 35-36+6 weeks group (n=74).PDA was diagnosed by echocardiography in time of ≤12 h,-24 h,-48 h,-72 h,-96 h,-120 h,-144 h and ＞144 but ≤168 h after birth.The parameters of cardiac function included peak flow rate of aorta valve orifice,peak flow rate of pulmonary artery valve orifice,cardiac output,stroke volume,ejection fraction,the ratio of early (E) and late (A) diastolic velocities of mitral and tricuspid valves.The risk factors of arterial ductus spontaneous closure were determined by Logistic regression analysis.Results The cumulative spontaneous closure rates of preterm infants in three groups were 95.5％,100.0％ and 100.0％ within 168 h after birth respectively. There were significant differences of cumulative spontaneous closure rate in different time among three groups (x2 =4.23,7.45,12.46,7.14,4.75,6.47,3.89 and 3.89 respectively,P＜0.05).After spontaneous closure of PDA during 12-24 h, peak flow rate of pulmonary artery valve orifice increased [(0.69±0.12) cm/s vs (0.65±0.12) cm/s,t=2.37,P=0.02],peak flow rate of aorta valve orifice [(0.65±0.11) cm/s vs (0.69±0.12) cm/s,t=2.51,P=0.02] and ejection fraction [(63.00±8.50) ％ vs (66.00±8.50) ％,t=2.34,P=0.02] decreased.Logistic regression analysis showed that,the risk factors of preterm infants with arterial ductus unclosed within 24 hours after birth were gestation age (OR =1,825,95％CI:1.239-2.689),1 min Apgar score 0-3 (OR=1.946,95％CI:1.572-3.527) and early onset sepsis (OR=3.215,95％CI:1.245-5.463) ; gestation age (OR=3.270,95％CI:1.852-5.774),twins (OR=3.634,95％CI:1.489-8.871),1 min Apgar score 0-3 (OR=3.752,95％CI:2.156-5.436),Ⅲ-Ⅳ stage of respiratory distress syndrome (OR=2.897,95％CI:1.764-5.348) and early onset sepsis (OR=3.172,95％CI:2.134-6.437) were the risk factors of preterm infants with arterial ductus unclosed during 24-48 hours after birth; and gestational age (OR=2.471,95％CI:1.087-5.613),1 min Apgar score 0-3 (OR=2.985,95％CI: 1.469-5.736), Ⅲ-Ⅳ stage of respiratory distress syndrome (OR =3.645,95％ CI:1.879-6.282),fluid volume excess (OR =4.135,95％CI:2.146-7.428) and early onset sepsis (OR=3.246,95％CI:2.146-4.526) for those with arterial ductus unclosed during 48-72 hours after birth. Conclusions The spontaneous closure rate of arterial ductus in the newborn infants whose gestational age over 28 weeks was above 90％ in the first week after birth.There was no difference of left ventricular pump function between before and after the spontaneous closure.Reducing the incidence of premature birth,twins,severe asphyxia,severe respiratory distress syndrome, fluid excess and early onset sepsis might improve the spontaneous closure of arterial ductus.

Effect of iodine deficiency in pregnant rats on doublecortin and synaptophysin (p38) expressions of fetal brain / 中华内分泌代谢杂志

ObjectiveTo investigate the effects of maternal thyroid dysfunction during pregnancy caused by iodine deficiency of different degrees on doublecortin ( DCX ) and synaptophysin ( p38 ) expressions in fetal brain.Methods Wistar female rats were randomly divided into four groups:adequate iodine ( AI),mild iodine deficiency ( MiID ),moderate iodine deficiency ( MoID ),and severe iodine deficiency ( SID ),according to the total daily iodine supply( fed on an iodine deficient diet with different dosages of KI added in drinking water).Three months later the rats were mated.Serum TSH and thyroid hormones were determined in maternal rats on gestational day 20 using chemiluminescent immunoassay.The iodine contents in urine and histological changes of thyroid gland were observed in pregnant rats.The mRNA and protein levels of DCX and synaptophysin ( p38 ) were analyzed in fetal brain by using real time quantitative RT-PCR and western blotting respectively.Results( 1 ) Iodine contents in urine of pregnant rats were reduced with the decrease of their iodine supply.Compared with group AI,serum TSH was significantly increased [ ( 2.95 ± 1.70 vs 1.31 ± 0.55 ) mU/L,P ＜ 0.05 ],and both TT4 and FT4 were significantly decreased [ ( 14.3±4.1 vs 28.4±19.3 ) nmol/L,P＜0.05 ] and [ ( 10.8±3.6 vs 20.2±8.0) pmol/L,P＜0.01 ] in pregnant rats of SID group.Whereas,a slight rise in TSH,and a mild decline in both TT4and FT4 were found in MoID and MiID groups.However,there were no significant changes in TT3 and FT3 levels among these four groups.( 2 )Histological characteristics of thyroid gland in pregnant rats showed a typical goiter with small follicular hyperplasia and lack of colloid in SID group,moderate follicular hyperplasia with decreased colloid in MoID group; but mild cellular hyperplasia without decrease in follicular size and colloid in MiID group.( 3 ) The mRNA levels of DCX were increased in fetal brains of three iodine deficiency groups compared with AI group,but a statistical significance was found in MoID group.The protein levels of DCX in all experiment groups were significantly increased.Both mRNA and protein expressions of synaptophysin ( p38 )were significantly down-regulated in three iodine deficiency groups.Conclusions Maternal thyroid dysfunction caused by iodine deficiency,even by mild or moderate iodine deficiency,may lead to retardation of fetal neuronal and synaptic growth.

Dynamic change and correlation of ventilative function pulmonary mechanics with cardiac function in the term infants / 中国小儿急救医学

Objective To investigate the dynamic change and correlation of the pulmonary ventilative function, mechanic and cardiac function in the term infants. Methods Twenty hundred term infants were divided into A 、B 、C and D groups by age which was 0 ～ 24 h, ～ 72 h, ～ 1 w and 28 d respectively. The lung ventilative and mechanical function were measured respectively by using techniques of tidal breathing flow-volume loop(TBFVL)and the single occlusion. The Master screen Paed-lung function devices of Germanic JAEGER Co. was be used in this study. The parameter of pulmonary function including minute volume(MV) ,tidal volume (TV), respiratory system compliance(Crs) and respiratory system resistance (Rrs). The cardiac function were measured by using SonoSite 180 PLUS color Doppler ultrasonic diagnostic apparatus. The main parameter of cardiac function including cardiac output(CO) and stroke volume(SV). Results The TV of A, B ,C and D group were 20. 2 ± 3.78,21. 1 ± 3.71,22. 3 ± 4. 48 and 23. 9 ±4.90 (ml)respectively, the TV of C and D group were higher than that of A group, and the TV of D group was higher than that of B group (P ＜ 0. 05).There were no significantly difference of Crs, Rrs among A, B, C and D group(P ＞ 0. 05). The CO of A,B,C and D group were 0.93 ±0. 23,0.93 ±0.23,1.02 ±0.21 and 1.08 ±0.27 (L/min) ,the CO of D group was higher than that of A and B groups (P ＜ 0. 05). The CO was negative correlation with Rrs (r = - 0. 16,P ＜ 0. 05) and positive correlation with MV、 TV、 Crs (r was 0. 50、 0. 54、0. 13 respectively, P ＜ 0. 05).Conclusion The lung ventilative function is mature gradually with increasing age. The cardiac output has been obviously improved for postnatal 1 week in the term infants. The pulmonary ventilative function and mechanic parameter are important effective factors of cardiac function.

Study on cardiac function in preterm infants / 中华围产医学杂志

Objective To investigate the features and influence factors of cardiac function in preterm infants.Methods One hundred and eleven preterm infants were divided into three groups according to the gestational age which was 28-31+6,32-33+6 and 34-36+6 weeks respectively.Fifty term-birth infants at gestational age of 37-41+6 weeks were taken as control group.The cardiac function was examined by SonoSite 180 PLUS color Doppler ultrasonic diagnostic apparatus.The parameters of cardiac function included heart rate,peak flow rate of aorta valve orifice (AV),peak flow rate of pulmonary artery valve orifice (PV),cardiac output (CO),stroke volume (SV),left ventricular end diastolic volume (LVEDV),left ventricular end systolic volume (LVESV),the ratio of early (E) and late (A) diastolic velocities of mitral and tricuspid valves (MVE/A,TVE/A).Within one week after delivery,the cardiac function was examined,and the cardiac function of preterm infants with different gestational age were compared.Another 162 preterm infants were divided into four groups according to the time at examination as 12 h-,24 h-,72 h-and 1 week-28 d.The influence factors of cardiac function were determined by multi-factor linear regression analysis.Results The AV,PV,CO,LVEDV,LVESV and SV increased with the increasing of gestational age.MVE/A (1.13±0.17,1.14±0.18,1.13±0.18) and TVE/A (0.90±0.16,0.90±0.13,0.90±0.15) of 28-31+6,32-33+6 and 34-36+6 weeks group were higher than those of control group (1.28±0.17 and 1.04±0.20),respectively (P＜0.05).PV of 72 h-group and 1 week-28 d group were higher than that of 12 h-group [(79.60±11.22) cm/s and (78.86±13.64) cm/s vs (72.61±8.56) cm/s](P＜0.05).The heart rate of 1 week-28 d group was higher than that of other three groups (P＜0.05).Both CO and SV were positively related to body weight and gestational age (r=0.55 and 0.36,0.61and 0.52,respectively,P＜0.05).Conclusions The left ventricular pump function increases with the increasing of gestational age,while the diastolic function of left and right ventricle of preterm infants does not change significantly in the first month of life.The PV of preterm infants significantly increases 72 h after delivery.The body weight and gestational age are important influence factors of cardiac function in preterm infants.

Analysis of urinary iodine levels in normal pregnant Chinese women in four districts / 中华内分泌代谢杂志

Objective To analyze the median urinary iodine(MUI)level in normal pregnant women based on World HeMth Organization(WHO) recommended criterion,and to provide the MUI reference values for monitoring and evaluating iodine nutrition during pregnancy and related studies.Methods Total 604 normal pregnant and 192 non-pregnant women(as a comparison)were selected from a cross-sectional survey.These women were all healthy,iodine sufficient,with normal thyroid function,and negative anti-thyroid antibodies.The iodine content in drinking water,edible salt,and urine was determined by standard methods,and serum TSH,FT4,FT3,thyroid peroxidaseantibody(TPOAb),and thyroglobulin antibody(TgAb)were measured using chemiluminescent immunoassay.Resuits (1)The iodine in drinking water was 3.0μg/L indicating such small amount of iodine could be neglected for daily iodine intake.(2)All women consumed iodized salt with the median iodine in salt of 31.7 mg/kg.The daily iodine intake of at least 240 μg could be roughly estimated if an average of 10 g salt was taken per person per day and further subtracted by 20%iodine lost during cooking,which could meet the iodine needs during pregnancy.(3)The MUI of 173.1μg/L was calculated from 604 pregnant women having 174.5,167.0,and 180.7 μg/L during the first,second,and third trimesters,respectively,reaching the optimal level of 150-249 μg/L recommended by WHO for pregnant women.However,our data showed relatively lower levels,not reaching 200μg/L.The MUI of 240.2μg/L was calculated from 192 non-pregnant women,reaching the level of"above requirement"(200-299μg/L) recommended by WHO for adults.(4)All women were euthyroid and antibody-negative,but the TSH level in pregnant women was lower than that in non-pregnant women,in particular during the first trimester,while FT4 and FT3 were considerably decreased compared with the non-pregnant(with an exception of FT4 in the first trimester),and both gradually declined with the gestational age.Conclusions The optimal MUI level of 150-249 μg/,L recommended by WHO can be applied to pregnant Chinese women,but our data provided a relatively low range of 150-200μ/L throughout pregnancy.The higher MUI of 240.2μg/L in non-pregnant women indicated that iodized salt with different contents should be supplied on market to meet the requirement of different groups of population.

Mother-infant's iodine metabolism and thyroid function during lactation with different iodine intakes / 中华内分泌代谢杂志

Objective To study mother and infant's iodine metabolism and thyroid function during lactation with different iodine intakes. Methods Wistar rats were randomly assigned to four groups with severe iodine deficiency (SID), mild iodine deficiency (MiID), normal iodine (NI), and excessive iodine (ExI) intake respectively. All rats were fed on an iodine deficient food and drinking water with different quantities of potassium iodide for 3 months until mating. The urinary iodine, milk iodine, blood iodine, and thyroid hormones (TH) were detected in lactating mother and the offspring rats 14 days after birth. Thyroid weight of mother rats was determined. Thyroid morphology of mother and their offsprings was observed. Results ( 1) Iodine contents in urine, milk, and blood of lactating rats and the offsprings were increased with the increase of iodine supplied in diet. But the change in amplitude between groups was decreased in the other; urine iodine > milk iodine > blood iodine. (2) Serum TT4[ (16. 7±12. 0 vs 36.4±15. 0) nmol/L, P<0.05] was significantly decreased, but TSH [(5.73±2.90vs 1. 38±0.30)mIU/L, P<0.01]and TT3/TT4(6.6±2.7 vs 2. l±0.3,P<0.01) were increased in lactating rats of SID group compared with NI, so as TT4( 10.6±2. 3 vs 16.4±4. 7) nmol/L, P<0.05 ] of offspring rats in SID, but were not in MiID and ExI groups. (3 ) Histological studies showed that small follicular thyroid nodules with follicular hyperplasia occurred in both lactating rats and their offsprings in the SID group, mild swelling in MiID group and polymorphism changes appeared in mother rats of ExI group, but no significant difference appeared in offsprings compared with NI group. Conclusions Severe iodine deficiency will lead to hypothyroidism in mother and infant, but normal iodine nutrition and thyroid function in mother and offspring were maintained through the compensatory action of mother and child in mild iodine deficiency and iodine excess.

Association of PPAR gamma Pro12Ala polymorphisms with coronary heart disease / 中国综合临床

Objective To investigate the association of PPAR gamma Pro12Ala polymorphisms with conroy heart disease(CHD). Methods One hundred eighty impatients were recruited in the study. Venous blood samples were collected after 12 h of fasting from all patients. DNA was extracted and Pro2Ala polymorphism in the PPAR gamma 2 genes was genotyped through the PCR-RFLP. The frequency and distribution of Pro2Ala polymorphism in Chinese Han population with CHD were analyzed. Gensini Score based on coronarography were used to grade the coronary. Results There were a total of 135 CHD patients,of which 52 were affected with single coronary lesion,43 with multi-coronary lesion,and 45 were normal. The frequency of P12/P12, A12/P12 in the coronary lesion group were 92.6% (125/135) and 7.4% (10/135) which were similar to that of 93.3% (42/45) and 6.7% (3/45)(P =0. 548). In the single coronary lesion group, the frequencies of P12/P12 and A12/P12 were 94.0% (42/52)and 9.6% (5/52) ,and 90.0% (36/40) and 10.0% (4/40) in the bi-coronary lesion group,97.7% (42/43) and 2.3% (1/43) in the multi-coronary lesion group,with no significant difference among the three groups( P ＞0.05).There were no significant difference on the frequency of P12/P12 and A12/P12 between various subgroups defined according to Gensini score (P = 0. 246). Compared to the frequency in non-obese, the frequency of A12/P12 were significantly higher in the obese ( P = 0.028 ). In PPAR gamma 2 genes B the Exton BstuI enzyme restriction site genes, BMI,waist-hip ratio and total cholesterol in the carriers of P12A genotype were significantly higher than those in the P12P genotype carriers ( P ＜ 0. 05 ). Conclusions PPAR gamma Pro12Ala polymorphisms might not be associated with CHD in Chinese Han population. The frequency of A12/P12 in obese is significantly higher than that in non-obese. PPAR gamma Pro12Ala polymorphisms might be associated with adiposity and lipid metabolism.

Sodium iodide symporter gene expression in thyroid of mice with different iodine intakes / 中华内分泌代谢杂志

Objective To investigate the sodium iodide symporter (NIS) gene expression during different iodine intakes and its function in thyroid autoregulation. Methods BabL/c mice were randomly divided into five groups according to their different iodine intake levels : low iodine (LI), normal iodine (NI), five-fold iodine (5HI) ,ten-fold iodine (10 HI) and fifty-fold iodine (50 HI). After three months and six months administration, they were sacrificed and thyroids were excised. The mRNA and protein expression level were determined by real time quantitative PCR and immunohistochemistry respectively. Iodine content in thyroid tissue was measured with spectrophotometry and thyroid hormone level was measured with radioimmunoassay. Results Compared with NI group, NIS mRNA and protein expression was greatly increased in LI groups. Immunohistochemistry analysis indicated that NIS was mostly located at the basolateral membrane of thyrocyte,suggesting the improved activity in transporting iodine. But when faced with long-term and severe iodine deficiency, the iodine content in thyroid was finally decreased ,and hormone level lowered. On the other hand, in HI groups NIS mRNA and protein expression was greatly down-regulated. There was a tendency of decreasing NIS gene expression level with increasing doses of iodine intakes. In addition, NIS protein was found mainly in intracellular vesicles, rather than at the cell membrane,suggesting the loss of its activity. The iodine content in thyroid tissue was only slightly increased and was not consistent with the iodine intake levels. Conclusion These findings indicate that NIS may be. regulated at transcription, translation and post-translation levels. This phenomenon constitutes a highly specialized intrinsic autoregulatory system that protects thyroid from high doses of iodine, but at the same time ensures adequate iodine uptake for hormone biosynthesis. NIS plays a critical role in thyroid autoregulation mechanism.

Trimester-specific reference data of thyroid hormones for normal pregnancy / 中华内分泌代谢杂志

Objective To set up the trimester-specific reference ranges of thyroid hormones for normal pregnant women to provide reference criteria for diagnosis, treatment and monitoring or screening of thyroid disease during pregnancy and related research. Methods A cross-sectional survey was conducted in pregnant and non-pregnant women in iodine sufficient areas. A total of 505 normal pregnant women and 153 normal non-pregnant women (as control) were selected for establishing trimester-specific reference ranges of thyroid hormones after rigorous screening through the survey questionnaire and laboratory tests. Thyroid hormones were measured by Bayer automated chemiluminescence immunoassay, and the reference range of each hormone was calculated as median (the 50th percentile value) and two-sided limits (the 2.5th and 97.5th percentile values). Results All women investigated were in iodine sufficient status within optimal urine iodine level. The serum TSH level during the 1st trimester was obviously declined compared with that in the non-pregnant individuals (P < 0.01), and started to rise during the 2nd trimester, but was still not restored to non-pregnant level until the 3rd trimester. Serum FT4 and FT3 levels gradually decreased from the 2nd trimester to the 3rd (P < 0.01), and the TT4 and TT3 levels were markedly elevated since early pregnancy (P < 0.01) and reached peak levels at the 2nd trimester approximately making up to 1.5 times of those in the non-pregnant individuals. Conclusion The thyroid hormone levels during pregnancy differ completely from those of the non-pregnant individuals, and also differ during different gestation periods. Therefore, to establish trimester-specific reference data of thyroid hormones during normal pregnancy may be important for clinical practice.

Analysis of urinary iodine and thyroid function in pregnant women of Hangzhou / 中华内分泌代谢杂志

Objective To investigate the urinary iodine level and thyroid function during different trimesters of pregnancy in Hangzhou residents and to provide evidence for monitoring iodine nutrition or screening thyroid function. Methods The urinary iodine level and thyroid function of 395 subjects from 5 hospitals in Hanzhou were investigated. The urinary iodine level was measured by arsenic-cerium contact process method. The serum TSH, FT3 and FT4 were measured by chemiluminescence method. Results (1) The urinary iodine median concentration during pregnancy in the 1st, 2nd and 3rd trimesters were 170.3, 170.2, 162.4 μ/L respectively, all significantly lower than that of non-pregnant women (251.9 μg/L, all P < 0.05); (2) The mean value of TSH during the 1st trimester of pregnancy was significantly lower than that of non-preguant women (P < 0.05). The mean values of FT4 and FT3 in the 2nd and the 3rd trimesters of pregnancy were significantly lower than those of the control (P < 0.05); (3) During 2nd trimester, there were 8.7% (9/104, in FT4) and 9.6% (10/104, in FT3) pregnant women below normal lower range while during 3rd trimester, these figures reached 22.7% (22/97) and 17.5% (17/97) resfectively. Conclusions More than half of the pregnant women in Hangzhou have good nutritional status of iodine. There are significant differences in thyroid hormone levels between the non-pregnant and pregnant women as well as between gestation periods. Therefore, it is necessary to establish a trimester-specific reference range of thyroid hormones for normal pregnancy. The screening for thyroid function is recommended for pregnant women besides monitoring routine urinary iodine.