Objective To establish a method for determination of trace lead in drinking water by intermittent flow HG-AFS was developed. Methods The conditions for K3Fe(CN)6-KBH4-HCl system of generation of PbH4 were optimized and interference of coexisting ions were tested. Results The fluorescence signal of blank solution was decreased evidently by treating K3Fe(CN)6 with activated carbon and the detection limit was effectively improved. The interference of coexisting ions could be suppressed in some degrees in the presence of K3[Fe(CN)6]. Under the optimized conditions, the detection limit of this method was 0.10 ?g/L and RSD(n=6) was in the rang 0.4%-3.8%. The recovery rate was 95.0%-112.0%. Conclusion This method was accurate, simple, sensitive and suitable for determination of trace lead in drinking water.

OBJECTIVETo compare the differences in the efficacy on speech and swallowing dysfunction of medulla oblongata palsy (MOP) after brainstem infarction between electroacupuncture at eight-neck-occiput points and routine acupoints.

METHODSSeventy-two patients were randomized into a neck-occiput points group and a meridian points group, 36 cases in each one. In the neck-occiput points group, the eight-neck-occiput points (Neck 1-4 points, Occiput 1-4 points) were selected. In the meridian points group, Lianquan (CV 23), Futu (LI 18), Tongli (HT 5), Hegu (LI 4) and the others were selected. Electroacupuncture was used in the two groups, dense-dispersion wave, retaining for 30 min. The treatment was given once a day, 5 treatments a week. Totally, 4 weeks were required. The symptom scores of speech and swallowing dysfunction were observed before and after treatment in the two groups. The efficacy was compared between the two groups.

RESULTSThe scores of speech and swallowing dysfunction were improved significantly after treatment in the two groups (P < 0.05, P < 0.01). The results in the neck-occiput points group were better than those in the meridian points group (both P < 0.01). The curative rate of speech dysfunction was 30.6% (11/36) and that of swallowing dysfunction was 22.2% (8/ 36) in the neck-occiput points group, which were better than 11.1% (4/36) and 5.6% (2/36) in the meridian points group, respectively. The differences were significant in comparison of the two groups (P < 0.01, P < 0.05).

CONCLUSIONElectroacupuncture at eight-neck-occiput points achieves a better efficacy on speech and swallowing dysfunction of MOP after brainstem infarction as compared with the routine acupoints. This therapy is characterized as more accurate point localization and safer operation.

Acupuncture Points ; Adult ; Aged ; Brain Stem Infarctions ; complications ; Bulbar Palsy, Progressive ; etiology ; physiopathology ; therapy ; Deglutition ; Electroacupuncture ; Female ; Humans ; Male ; Medulla Oblongata ; physiopathology ; Middle Aged

Objective To explore the evaluation value of modified USA National Institutes of Health Stroke Scale (mNIHSS) score combined with bedside transcranial Doppler ultrasonography (TCD) on the early prognosis of ischemic stroke (AIS).Methods One hundred and thirty-six anterior circulation AIS patients were collected,mNIHSS score was evaluated on admission,and emergency bedside TCD examination was performed to evaluate vascular anomalies.After active treatment after discharge,the modified Rankin scale (mRS) score was recorded to evaluate 90 d prognosis.The value of mNIHSS score combined with TCD examination analysis on the prognosis was analyzed.Results If the mNIHSS score ＞ 8 scores was judged to be poor prognosis,the sensitivity was 0.684,the specificity was 0.806,the positive predictive value was 0.578,the negative predictive value was 0.868.If related macro vascular abnormalities in bedside TCD examination were evaluated for clinical prognosis,the sensitivity was 0.736,the specificity was 0.643,the positive predictive value was 0.444,the negative predictive value was 0.863.If both,the specificity was 0.918,the positive predictive value was 0.714,the positive likelihood ratio was 6.41 ;and the two were not available,the negative predictive value was 0.928,negative likelihood ratio was 0.20.Conclusion mNIHSS score combined with TCD examination in evaluating the prognosis of AIS patients can improve the positive or negative predictive value.

Objective To establish and confirm the hepatitis B surface antigen(HBsAg) enzyme linked immunosorbent assay(ELISA) high specificity S/CO limit as blood donor deferral criterion.Methods A total of 783 HBsAg ELISA reactive and 588 non-reactive samples were collected, and confirmed by HBsAg electrochemiluminescence detection and neutralization test.Receiver operating characteristic curve (ROC curve) was used to evaluate the S/CO limit under 95% and 99% specificity.Another 124 HBsAg ELSIA reactive samples were tested for five kinds of hepatitis B virus(HBV) markers by using electrochemiluminescence detection to verify the blood donor deferral limit.The blood donor deferral limits of 3 laboratories, using the same reagents, were compared.Results The 95% specificity S/CO limit of two reagents were 0.24 and 0.65, the 99% specificity S/CO limit of two reagents were 3.89 and 3.62.The 99% specificity S/CO limit was set as the blood donor deferral criterion.Verify test indicated that the samples, with S/CO higher than the blood donor reentry limit of reagent 1 and 2, were all from HBV infected donor.The 99% specificity S/CO limits of reagent 1 in the other three laboratories were 3.77, 3.60 and 13.42 respectively.And the 99% specificity S/CO limits of reagent 2 in the other three laboratories were 27.73, 31.75 and 1.17.Conclusion The blood donor deferral limit of HBsAg ELISA could identify the true positive blood donor, and reduce the number of blood donor, entering the reentry process.It might not suit to adopt a unified donor deferral limit in different laboratories, even using the same reagents.

Objective To investigate the level of serum free fatty acid (FFA )after improving the life style in patients with coronary heart disease complicated metabolic syndrome and the effect of therapeutic life style on traditional risk factors of coronary artery disease.Methods A total of 395 patients with coronary heart disease complicated metabolic syndrome were recruited.Pa-tients were divided into intervention group (group A,conventional drug therapy+ intensive life style intervention,n=97)and non-intervention group (group B,conventional drug therapy,n=38)according to the scores of life style.Serum free fatty acid (FFA) was determined by ELASA.The scores of life style was obtained bylife style questionnaire.Results (1)The serum FFA of pa-tients with coronary heart disease complicated metabolic syndrome were positively related to waist circumference and waist-high-ra-tio.(2)Waist circumference,BMI and FFA of group A were significantly lower than those in group B after therapeutic life style in-tervention(P <0.05).(3)Compared with the baseline,the constitution index and FFA in group A were significantly lower after 6-months therapeutic life style intervention(P <0.05).Conclusion Therapeutic life style can reduce the level of FFA and constitution index of the patients with coronary heart disease complicated metabolic syndrome.

ObjectiveTo explore the optimal method of protecting bone marrow in postoperative concurrent chemoradiotherapy of stage Ⅱ - Ⅲ rectal cancer by comparing two techniques of intensitymodulated radiotherapy (IMRT). MethodsFifteen patients with stage Ⅱ - Ⅲ rectal cancer after surgery had CT simulation. Clinical target volume, small bowel, bladder and bone marrow were contoured. Two IMRT treatment plannings with and without bone marrow-sparing (BMS-IMRT and IMRT) were separately designed. The dose distribution was compared based on that 95％ of the planning target volume received the prescribed dose. ResultsBMS-IMRT had an advantage over IMRT in terms of conformity indices ( 1. 06∶1. 04, t =- 2. 61, P =0. 023 ), but inferior to I M RT for homogeneity indices ( 0. 81 : 0. 75, t =- 2. 34, P =0.037)).Compared with IMRT, BMS-IMRT reduced the V5, V10, V20, V30, V40 of bone marrow (97.09％∶98.72％, t=-2.34, P=0.037;92.38％∶96.46％, t=-2.41, P=0.033;83.36％∶91.70％, t=-3. 18, P=0.008;51.47％∶69.65％, t=-4.92, P=0.000;36.34％∶49.57％, t=-2.66, P =0. 021 ). The doses received by small bowel and bladder were similar between BMS-IMRT and IMRT, except that the V20 of bladder was lower in BMS-IMRT (77. 32％∶92. 39％, t =-3.52, P=0. 004). Conclusions BMS-IMRT reduces low dose volume of bone marrow without increasing dose to other risk organs.BMS-IMRT might reduce acute hematologic toxicity and increase the feasibility of postoperative concurrent chemoradiotherapy in stage Ⅱ -Ⅲ rectal cancer.

Objective To investigate the expressions of claudin-5 and claudin-10 in colorectal carcinoma(CRC) and its significance.Methods Pathological verified 50 colorectal tissue (CRT),25 colorectal adenoma (CRA),25 non lymph node metastasis CRC (non-LNM CRC) and 25 lymph node metastasis CRC (LNM CRC) were detected for the expression of claudin-5 and claudin-10 by immunohistochemical SP(streptavidin perdcidase) method.Results The positive expression rate of Claudin-5 was 82%,76%,68% in CRT,CRA,CRC,respectively.The positive expression rate of claudin-5 in different groups was not significantly different(X~2 =2.638,P＞0.05).claudin-5 expression was correlated with LNM (P＜0.05),but was not correlated with gender,age,tumor,location,differentiation,tumor diameter and serous membrane invasion(P＞0.05).The positive expression rate of claudin-10 was 54%,56%,72% in CRT,CRA,CRC,respectively.The positive expression rate of claudin-10 in different groups was not significantly different(X~2 = 3.839,P＞0.05).claudin-10 expression was correlated with tumor diameter,serous membrane invasion and LNM (P＜0.05),but was not correlated with gender,age,location and differentiation (P＞0.05).There was no significant correlation between claudin-5 expression and claudin-10 expression in CRC (r = 0.050,P = 0.732).Conclusions claudin-5 and clandin-10 are expressed in CRT,CRA,and CRC.They are not involved in CRC occurrence,claudin-5 and clandin-10 abnormally expressions are significantly associated with the incidence of LNM.Meanwhile,claudin-10 expression is correlated with tumor diameter and serous membrane invasion.There was no significant correlation between claudin-5 expression and claudin-10 expression in CRC.

Objective To analyze hepatitis B virus(HBV) infection stage in single nucleic acid test(NAT)reactive blood donors.Methods Blood donor samples were screened routinely for HBV DNA by using transcription-mediated amplification(TMA) NAT and quantitative polymerase chain reaction(PCR).Then serum markers of HBV were also detected.The HBV infection stage was analyzed.Results Among the 225 single NAT reactive samples,78(34.67%) were identified to be reactive for HBV DNA by TMA NAT discrimination test and/or PCR test,of which 63(82.89%) were occult HBV infection(OBI),13(17.11%) were probably window period infection(pWP),and 2 cases could not be classified for infection stage.Among the OBI samples,49 samples(77.78%) were with HBV DNA concentration less than 20 IU/mL,whereas,there were only 4 samples(30.77%) in pWP samples.The 225 samples were classified into three groups according to the S/CO of NAT, including 1-<6 group,6-<10 group and 10-17 group, the confirmed HBV DNA positive rates of which were 13.11%,13.64% and 47.18%,and the positive rate of 10-17 group was higher than 1-<6 group and 6-<10 group(P<0.05).In all 63 OBI samples,there were 8(12.70%),3(4.76%) and 52(82.54%) samples were classified into S/CO 1-<6,6-<10 and 10-17,respectively.All of the 13 pWP samples were with NAT S/CO of 10-17.Conclusion Part of single NAT reactive blood donors could be with HBV infection,of which OBI might be popular than pWP, with very low concentration of HBV DNA.Deferral of single NAT reactive blood donors could reduce transfusion-transmitted HBV infection.

Objective To investigate the effects of Sulfotanshinone Sodium Injection (SSI) on neuropathic pain in rats.Methods One hundred and eight adult male Wistar rats,aged 6-8 weeks,weighing 180-220 g,were randomly divided into 3 groups (n =36 each):sham operation group (group S) ; chronic constrictive injury (CCI)group; group SSI.The animals were anesthetized with intraperitoneal 10% chloral hydrate 350 mg/kg.In groups CCI and SSI,4 ligatures were placed on the right sciatic nerve at 1 mm intervals with 4-0 silk thread according to the method described by Bennett et al.In group S,the right sciatic nerves were exposed,but not ligated.In group SSI,SSI 25 mg/kg was injected intraperitoneally once a day starting from the end of operation until one day before the animals were sacrificed,while the rats received the equal volume of normal saline (5 ml/kg) instead of SSI in groups S and CCI.Twelve animals in each group were chosen at 1 day before operation and 3,7 and 14 days after CCI (T1-4) to measure mechanical paw withdrawal threshold to yon Frey stimuli (MWT) and paw withdrawal latency to thermal nociceptive stimulus (TWL).Six rats in each group were sacrificed at T2-4 after measurement of pain threshold,and their lumbar segnents (L4-6) of the spinal cord were immediately removed for determination of Bcl2 and caspase-3 expression in spinal dorsal horn (by immune-histochemistry),and MDA content and SOD activity (by spectrophotometry) in spinal cord.Results Compared with group S,PWT was significantly decreased,PWL was shortened,the expression of Bcl-2 and caspase-3 was up-regulated,MDA content was increased and SOD activity was decreased at T2-4 in groups CCI and SSI (P ＜ 0.05).Compared with group CNP,PWT was significantly increased,PWL was prolonged,the expression of Bcl-2 was up-regulated,the expression of caspase-3 was downregulated,MDA content was decreased and SOD activity was increased at T2-4 in group SSI (P ＜ 0.05).Conclusion SSI can mitigate neuropathic pain in rats and inhibition of oxidative stress in spinal cord tissues and reduction of apoptosis in spinal dorsal horn neurons are involved in the mechanism.

Objective To evaluate the effects of propofol combined with resveratrol on hepatic ischemiareperfusion (I/R) injury in rats.Methods One hundred and eight male Sprague-Dawley rats,aged 6-7 weeks,weighing 220-270 g,were randomly divided into 6 groups (n =18 each):sham operation group (group S) ; I/R group; solvent group (group TW-80) ; propofol group (group P) ; resveratrol group (group R) ; propofol combined with resveratrol group (group P + R).The animals were anesthetized with intraperitoneal 10 ％ chloral hydrate 3.5-4.0 ml/kg.Liver ischemia was produced by clamping the first hepatic portal for 30 min,followed by 12 h reperfusion.In group P,propofol was infused intravenously at 10 mg· kg-1 ·h-1 starting from 10 min before ischemia until the end of operation.In group R,resveratrol 10 mg/kg was injected intravenously at 10 min before ischemia.In group P + R,resveratrol 10 mg/kg was injected intravenously and then propofol was infused intravenously at 10 mg· kg-1· h-1 starting from 10 min before ischemia until the end of operation.The equal volume of normal saline was given instead in groups S and I/R,and the equal volume of TW-80 was given instead in group TW-80.Six rats in each group were chosen at 3,6 and 12 h of reperfusion and blood samples were taken from the superior and inferior vena cava for measurement of serum alanine aminotransferase (ALT) and aspartate amino transferase (AST) activities.The rats were then sacrificed and livers were removed for microscopic examination and for determination of superoxide dismutase (SOD) and myeloperoxidase (MPO) activities,inducible nitric oxide synthase (iNOS) expression,and malondialdehyde (MDA) and nitric oxide (NO) contents in liver tissues.Results Compared with group S,the serum ALT and AST activities,and MDA and NO contents,MPO activity and iNOS expression in liver tissues were significantly increased,and the activities of SOD were decreased in the other four groups (P ＜0.05).Compared with group I/R,the serum ALT and AST activities,and MDA and NO contents,MPO activity and iNOS expression in liver tissues were significantly decreased,and the activities of SOD were increased in groups P,R and P + R (P ＜ 0.05).Compared with groups P and R,SOD activity was significantly increased,and the other parameters were decreased in group P + R (P ＜ 0.05).The pathological changes were significantly attenuated in groups P,R and P + R compared with group I/R.Conclusion Pretreatment with propofol and resveratrol can attenuate hepatic I/R injury in rats by increasing antioxidation and inhibiting lipid peroxidation and reducing production of endogenous NO,and the combination of the two agents provides better efficacy than etheir alone.