Objective To investigate whether there are differences in the detection of biochemical items such as electrolytes , total protein and urea between arterial plasma and venous plasma .Methods Self paired design was used to compare and study the biochemical results of different samples .70 samples ( 36 samples from male patients and 34 from female patients ) that were performed with both arterial blood gas analysis and biochemical item test of venous blood in Clinical Laboratory of Peking Union Medical College Hospital during the period from June to September of 2017 were collected.18 biochemical items like electrolytes in arterial blood and venous blood were synchronously detected by automatic biochemical analyzer.Statistic analyses were carried out by SPSS 18.00.Whether the deviation was of clinic significance was determined by National Health Standards ( WS/T 403-2012 ) and the total error admitted by Royal Society of Pathology of Australia .Regression analysis of Passing-Bablok was performed by MedCalc software . The difference between the results of different samples was investigated by drawing Bland -Altman diagram.Results The results of Ca, Cl, K, Na, P, TP, ALB, ALT, AST, LDH, Glu, Cr, Urea, TG, CHO, UA, CHE, TBA in the samples of arterial blood plasma were 2.46(2.25-2.56) mmol/L,(105.68 ±7.29)mmol/L, 3.81(3.54-4.03) mmol/L, 140.45(137.08-144.20) mmol/L, 0.97(0.77-1.11) mmol/L,(60.39 ±9.40)g/L,(31.23 ±6.81)g/L, 17.4(11.95 -30.05)U/L, 20.85(14.9 -34.03) U/L, 210.1(163.15-342.60) U/L, 7.58(5.95-10.04) mmol/L, 76.35(51.05-110.7) μmol/L, 6.94(3.98-11.08) mmol/L, 1.15(0.84-1.89) mmol/L, 3.31(2.73-4.35) mmol/L, 271.55(187.78-423.30) μmol/L,(4.71 ±2.17)KU/L, 2.19(1.09 -4.19) μmol/L,respectively, and 2.24(2.05-2.35) mmol/L,(103.98 ±7.32)mmol/L, 3.84(3.58 -4.19) mmol/L, 139.30(136.08 -142.33) mmol/L, 0.99(0.78-1.14) mmol/L,(60.37 ±9.67) g/L,(32.62 ±6.89) g/L, 17.6(12.75-31.2) U/L, 20.6(15.28-36.6) U/L, 233.95(176.48-363.75) U/L, 7.55(5.62-9.52) mmol/L, 77.15 (56.08-111.98) μmol/L, 6.94(3.97 -10.53) mmol/L, 1.13(0.83 -1.93) mmol/L, 3.23(2.71-4.37) mmol/L, 273.4(187.30-401.55) μmol/L,(4.74 ±2.21) KU/L, 2.29(1.02 -4.23) μmol/L respectively in the samples of venous blood plasma .The difference of results of TP、Glu、Cr、TG、CHE、TBA between two types of samples were of no statistic significance ( the values of t or Z were 0.121,-0.054,-0.269,-0.480,-1.730 and -1.843 respectively, P>0.05), among these items the difference of Glu was of notable clinical significance (>1/2 TE percentage:50％).The difference of results of Ca , Cl, K, Na, P, ALB, ALT, AST, LDH, Urea, CHO, UA between two types of samples were of statistic significance (the values of t or Z were -7.115,6.794,-2.119,-4.996,-3.483,-8.839,-2.419,-2.742,-3.833,-5.010,-2.060 and -2.467 respectively, P<0.05), among these items the difference of Urea, CHO, UA, Na, P and ALT was of no notable clinical significance ( >total TE percentage: 0％, 2.86％, 0％, 2.9％, 4.3％, 1.43％ respectively), while the difference of Ca, Cl, K, ALB, AST and LDH was of clinical significance (>total TE percentage:90％, 10％, 14.3％, 32.9％, 10.00％, 32.9％respectively).Conclusions The differences in the detected data of some biochemical items between venous plasma and arterial plasma demonstrated clinical significance .When detecting those biochemical items , clinicians should pay attention to the selection of arterial blood sample .It should be considered to establish a reference interval for related biochemical items of arterial blood when necessary .

Objective:To explore the effects of the γ-aminobutyric acid(GABA) neurons and melanin-concentrating hormone (MCH) neurons of the nucleus accumbens (NAc)-lateral hypothalamic area (LHA) neural pathway on the rewarding feeding(palatable food sweat condensed milk) in the obesity rats.Methods:Total 142 male Wistar rats of SPF grade were divided into normal diet (ND) group ( n=68) and high-fat diet induced obesity (DIO) group ( n=74) according to the principle of body mass matching. The rats in the two groups were given normal diet and high-fat diet for 8 weeks. Eight weeks later, 6 DIO rats were randomly selected to observe the nerve projection from GABA neurons in NAc to MCH neurons in LHA by fluorogold retrograde tracing combined fluorescence immunohistochemistry. And the expressions of c-Fos and MCH in LHA after ingestion of sweet condensed milk(rewarding feeding) were observed by fluorescence immunohistochemistry (6 rats in each group). GABA receptor agonist Musimol or GABA receptor antagonist Bicuculine was microinjected into the nucleus of LHA to observe the effect of GABA on rewarding food intake in ND and DIO rats ( n=8 in each group), and the changes of rewarding food intake after blocking MCH signal ( n=8 in each group). SPSS 17.0 was used for statistical analysis, two-way ANOVA and post hoc Bonferroni test were used for comparison among multiple groups, and t-test was used for comparison between two groups. Results:After 8 weeks of high-fat diet modeling, the intake of delicious food in DIO rats was significantly higher than that in ND rats((12.52±2.29) mL, (7.45±1.23) mL, t=4.778, P<0.01) after satiety.The results of fluorogold retrograde tracing combined with fluorescence immunohistochemistry showed that GABA neurons in NAc projected nerve fibers to neurons in LHA, and GABA A receptors in some neurons in LHA coexisted with MCH.The results of NAc-LHA pathway on delicious food intake showed that the interaction between rat group and drug intervention was significant( F=9.869, P<0.01). Simple effect analysis showed that the intake of delicious food after microinjection of Musimol into LHA nucleus of ND rats was significantly lower than that of microinjection normal saline ((4.25±1.38) mL, (7.29±1.49) mL, P<0.01), while the intake of delicious food after injection of Bicuculine was significantly higher than that of microinjection normal saline((10.72±2.11) mL, (7.29±1.49) mL, P<0.05). The intake of delicious food after microinjection of Musimol into LHA nucleus in DIO group was significantly lower than that of microinjection normal saline((3.51±1.77)mL, (13.68±2.95) mL, P<0.01), but there was no significant difference between microinjection Bicuculine and microinjection normal saline ((14.83±3.44) mL, (13.68±2.95) mL, P>0.05). The results of blocking MCH signal on delicious food intake showed that the interaction effect between SNAP-94847 and Bicuculine intervention was not significant ( F=1.468, P>0.05). The main effect of SNAP-94847 intervention was significant ( F=15.880, P<0.01)and the main effect of Bicuculine intervention was significant ( F=6.930, P<0.05). After intracerebroventricular injection of MCH receptor blocker SNAP-94847, the delicious food intake of ND rats was significantly less than that of injection normal saline((4.78±1.72) mL, (7.63±2.77) mL, P<0.05), and it was not affected by pre injection of Bicuculine in LHA ((6.24±2.18) mL, (4.78±1.72) mL, P>0.05). In the DIO rats, the interaction effect between SNAP-94847 and Bicuculine intervention was not significant( F=0.006, P>0.05). The main effect of SNAP-94847 intervention was significant ( F=18.46, P<0.01) and the main effect of Bicuculine intervention was not significant ( F=2.059, P>0.05). After intracerebroventricular injection of MCH receptor blocker SNAP-94847, the delicious food intake of DIO rats was significantly lower than that of injection normal saline((6.89±2.11) mL, (12.19±4.36) mL, P<0.05), and it was not affected by pre injection of Bicuculine in LHA ((8.72±2.26) mL, (6.89±2.11) mL, P>0.05). Conclusion:GABAergic signal in NAc can regulate the expression of MCH in neurons of LHA. In the DIO rats, the sensitivity of MCH neurons in LHA to satiety signal decreases and the hedonic feeding increases.

Background: Thyroid diseases are highly prevalent worldwide, but their diagnosis remains a challenge. We established reference intervals (RIs) for thyroid-associated hormones and evaluated the prevalence of thyroid diseases in China. Methods: After excluding outliers based on the results of ultrasound screening, thyroid antibody tests, and the Tukey method, the medical records of 20,303 euthyroid adults, who visited the Department of Health Care at Peking Union Medical College Hospital from January 2014 to December 2018, were analyzed. Thyroid-associated hormones were measured by the Siemens Advia Centaur XP analyzer. The RIs for thyroid-associated hormones were calculated according to the CLSI C28-A3 guidelines, and were compared with the RIs provided by Siemens. The prevalence of thyroid diseases over the five years was evaluated and compared using the chi-square test. Results: The RIs for thyroid stimulating hormone (TSH), free thyroxine (FT4), free triiodothyronine (FT3), total thyroxine (TT4), and total triiodothyronine (TT3) were 0.71–4.92 mIU/L, 12.2–20.1 pmol/L, 3.9–6.0 pmol/L, 65.6–135.1 nmol/L, and 1.2–2.2 nmol/L, respectively. The RIs of all hormones except TT4 differed significantly between males and females. The RIs of TSH increased with increasing age. The prevalence of overt hypothyroidism, overt hyperthyroidism, subclinical hypothyroidism, and subclinical hyperthyroidism was 0.5% and 0.8%, 0.2% and 0.6%, 3.8% and 6.1%, and 3.3% and 4.7% in males and females, respectively, which differed from those provided by Siemens. Conclusions Sex-specific RIs were established for thyroid-associated hormones, and the prevalence of thyroid diseases was determined in the Chinese population.

Chondrosarcoma original from the zygomatic arch is a very rare disease with high malignancy. Surgery is the main means of treatment at present for duo to its poor sensitivity to radiochemotherapy. We reported a young patient who was recovery well in a 4-years follow-up without radiochemotherapy after a total resection of the tumor.
Bone Neoplasms ; Chemoradiotherapy ; Chondrosarcoma ; Humans ; Self Concept ; Zygoma

Background: Twenty-four-hour urinary free cortisol (UFC) measurement is the initial diagnostic test for Cushing’s syndrome (CS). We compared UFC determination by both direct and extraction immunoassays using Abbott Architect, Siemens Atellica Solution, and Beckman DxI800 with liquid chromatography-tandem mass spectrometry (LC-MS/MS). In addition, we evaluated the value of 24-hr UFC measured by six methods for diagnosing CS. Methods: Residual 24-hr urine samples of 94 CS and 246 non-CS patients were collected.A laboratory-developed LC-MS/MS method was used as reference. UFC was measured by direct assays (D) using Abbott, Siemens, and Beckman platforms and by extraction assays (E) using Siemens and Beckman platforms. Method was compared using Passing–Bablok regression and Bland–Altman plot analyses. Cut-off values for the six assays and corresponding sensitivities and specificities were calculated by ROC analysis. Results: Abbott-D, Beckman-E, Siemens-E, and Siemens-D showed strong correlations with LC-MS/MS (Spearman coefficient r = 0.965, 0.922, 0.922, and 0.897, respectively), while Beckman-D showed weaker correlation (r = 0.755). All immunoassays showed proportionally positive bias. The areas under the curve were 0.975 for Abbott-D, 0.972 for LCMS/MS, 0.966 for Siemens-E, 0.948 for Siemens-D, 0.955 for Beckman-E, and 0.877 for Beckman-D. The cut-off values varied significantly (154.8–1,321.5 nmol/24 hrs). Assay sensitivity and specificity ranged from 76.1% to 93.2% and from 93.0% to 97.1%, respectively. Conclusions Commercially available immunoassays for measuring UFC show different levels of analytical consistency compared to LC-MS/MS. Abbott-D, Siemens-E, and Beckman-E have high diagnostic accuracy for CS.

Objective: To analyze the risk factors of frequent gout flare, and to evaluate its susceptibility to identify patients with≥2 acute attacks per year. Methods: A total of 579 of cases gout patients with no history of taking urate lowering treatment (ULT) in recent 12 months were enrolled. The patients were divided into frequent group (gout episodes≥twice per year) and non-frequent group(gout attacksResults: There were significant differences in involvement of upper limb joints, tophi, combining hypertension and renal stone between two groups. The two groups had no statistical differences in family history, gender, history of smoking and drinking, ratios of regular exercise, and combining diabetes, hepatic insufficiency, hypertriglyceridemia, hypercholesterolemia, and overweight/obesity. There was significant differences in the number of joints involved, the history of disease duration, the level of SUA and TG[(4.66±2.54) vs (2.77±1.64), (6.68±5.11) vs (5.14±3.89) years, (525.82±132.11) vs (489.33±139.81) μmol/L, (2.51±1.94) vs (2.05±1.22) mmol/L, P<0.05 or P<0.01]; There were no statistical differences in age of onset, SBP, DBP, age of initial diagnosis, fasting blood glucose, TC, creatinine, glomerular filtration rate, AST, ALT, body mass index, waist circumference, and waist-to-hip ratio. Logistic regression analysis indicated that a large number of joints involved and higher serum uric acid level were risk factors of frequent gout attacks. The ROC curve showed that the number of joints involved had qualified performance in identifying patients with frequent gout attacks. When the number of joints involved was >2, and the sensitivity, specificity, positive predictive value and negative predictive value were 77.8%, 43.3%, 85.6%, and 56.6%, respectively, and the difference was significant. Conclusion Higher SUA and a larger number of joints involved associate independently with frequent gout attacks. The number of joints involved at initial diagnosis>2, which can predict the frequent flare, and start ULT as earlier as possible. Patients with joints involved at initial diagnosis>2 are at greater risk of frequent gout flare.

OBJECTIVE: The design and development of split memory alloy sternum bone plate are discussed, and the effect of split memory alloy sternum bone plate internal fixation in the treatment of sternal fractures are analysed. METHODS: The structure of the product is designed according to the anatomy and physiological characteristics of human bones, and the cross section shape of the product is designed according to the cross section shape of human bones. Internal fixation is effective in the treatment of sternal fracture. RESULTS: The split memory alloy sternal plate was successfully designed and developed, and all the patients with sternal fractures treated by internal fixation were clinically healed, the hospitalization and fracture healing time were significantly shortened, and no obvious complications occurred. CONCLUSIONS The application of split memory alloy sternal plate internal fixation in the treatment of sternal fracture has the advantages of small trauma, simple operation, safety, reliable fixation, good histocompatibility and less complications, and is conducive to promoting fracture healing and respiratory function improvement.
Alloys ; Bone Plates ; Fracture Fixation, Internal ; Fracture Healing ; Humans ; Sternum/surgery*

Objective: To compare the consistency of thyroid stimulating hormone (TSH) results from four chemiluminescence assays. Methods: A total of 102 fresh serum samples from Peking Union Medical College Hospital during March 2018 and April 2018 were collected for precision evaluation and methodological comparison referring to CLSI EP15-A2 and EP9-A2 protocols. The levels of serum TSH were detected by Abbott i2000 (system A), Beckman DXI800 (system B), Siemens ADVIA Centaur XP (system C) and Roche e601 (system D) automatic chemiluminescence analyzers and their matching reagents, respectively. The obtained results were compared with the passing-bablok and Bland Altman methods. Taking 0.27 μIU/mL and 5.33 μIU/mL as the medical decision level, the expected bias of each detection system was compared. Results: The precisions of systems A,B,C and D were 1.7%-3.3%， 2.3%- 3.9%，0.7%-2.3% and 0.6%-1.5%,respectively. The median (P 25,P 75) of TSH concentrations detected by systems A,B,C and D were 1.898 (0.518,4.809)μIU/mL, 2.819 (0.719,7.020)μIU/mL,2.502 (0.692,6.888)μIU/mL and 3.105 (0.886, 7.905)μIU/mL, respectively. The coefficients of determination (R 2 ) of regression equation were above 0.975 for 4 detection systems. The correlation coefficients (r), intercepts and slopes of 4 detection systems were 0.993 5-0.997 1, 0-0.06 and 0.59-1.15, respectively, and systems B and C had the best correlations with 1.02 of slope and 0 of intercept. The deviation plot showed that the bias% of 4 detection systems was between -48.1% and 17.3%. Among them, systems A and D had the largest bias, while systems B and C had the lowest bias. The expected bias of 4 detection systems at the medical decision level was -40.7%-37.2%. Conclusion The consistency between Beckman and Siemens TSH detection systems is good, while those of Roche and Abbott TSH detection systems are different from the other two.