Our ancestor found that some of the Chinese herbal drugs were toxic during their clinical practice. They graded the toxicity of Chinese herbal drugs into three degrees and thought that the term "toxicity of the Chinese herbal drugs" could be used in a broad and a narrow sense. In modern times, toxic components of the Chinese herbal drugs and their toxic mechanisms, especially the toxicity on the kidney, were further revealed. The factors that affect the toxicity of the Chinese herbal drugs include the species, preparation, dose and environment. To prevent the toxicity of the Chinese herbal drugs, we must strengthen the management of the Chinese herbal drugs. On the other hand, doctors' recognition of the toxicity of Chinese herbal drugs should be enhanced. At the same time, patients should be told to decoct and take Chinese herbal drugs correctly.

Objective To study the effect of inhalation combined salmeterol plus fluticasone propionate in treatment of asthma in children between 4 ～ 5 years old.Methods Seventy-four children (age range,4 ～ 5 years) were enrolled for our study,they were randomly divided into 2 groups (one group inhaled combined salmeterol plus fluticasone,37 children;the other group inhaled fluticasone,37 children).Comparative studies of clinical efficacy,quantified symptom score,and regular follow-up observations were conducted at the interval of one week,one month,three months.Results In the first week and first month during the treatment,there were no difference between salmeterol plus fluticasone group and fluticasone group (P ＞ 0.05).In the third month during the treatment,the daytime ratings(0.16 ± 0.09 vs 0.32 ± 0.11,P ＜ 0.05) and night ratings(0.04 ± 0.01 vs 0.14 ±0.00,P ＜0.05) of salmeterol plus fluticasone group were significantly better than those of fluticasone group.After three months,more children in salmeterol plus fluticasone group were responsive to the decreased dose of the drug than those of fluticasone group (x2 =4.57,P ＜ 0.05).Conclusion In the follow-up of exacerbatious,treatment with combined salmeterol and fluticasone propionate was as efficient as that of fluticasone in alleviating symptoms.During remission of asthma,combined salmeterol and fluticasone propionate was probably better than fluticasone for control of symptoms.

Objective To explore the relationship between the concentration of t, t-2, 4-DDE in cooking oil fume(COF) and the cooking temperature. Methods The temperature control system of oil heating was developed, the activated carbon was used to collect gaseous pollutants. Six samples were prepared at 60, 90, 120, 150, 180, 210, 240 and 270 ℃. The concentration of t, t-2, 4-DDE in COF was analyzed by GC-FID. Results The concentration of t, t-2, 4-DDE in COF was below the detection limit when the oil temperature was not higher than 120 ℃. Among the 150 ℃ and 270 ℃ groups, the concentration of t, t-2, 4-DDE showed a significant increase. Conclusion The concentration of t, t-2, 4-DDE in COF may obviously increase as the cooking temperature is not lower than 150℃.

0.05).Right Group had lower incidence of pigeon chest compared with that of Median Group [0 vs.1.6%,?2=413.041,P=0.000].The scores of TACQOL questionnaire of Right Group were higher than that of Median Group in the domains "Physical Complaints" [(29.6?2.8) vs.(28.1?3.0),t=4.843,P=0.000],"Motor Functioning" [(31.2?1.1) vs.(30.5?1.6),t=5.139,P=0.000] and "Cognitive Functioning" [(29.9?3.2) vs.(26.9?4.2),t=7.902,P=0.000].Conclusions The repair surgery of ventricular septal defects through a shorter right lateral thoracotomy can provide superior early and late outcomes and better health-related quality of life for pediatric patients.

Objective To establish a method of GS-MS for determination of polychlorinated biphenyls (PCBs) in human cerumen. Methods The PCBs in cerumen samples was separated by n-hexane extraction, liquid-liquid extraction separation and column chromatography purification, then was analyzed quantitatively by gas chromatography and affirmed qualitatively by mass spectroscopy. Results The detection limit, average recovery rate and precision of this method were 0.15 ?g/g fat, 92.1% and 3.0%-4.6% (n=12) respectively. The contents of PCBs in 90 cerumen samples collected in polluted and control areas were detected. The levels(0.00-18.42 ?g/g fat) of PCBs in cerumen collected in polluted area were significantly higher than that in the control area(P

Objective To evaluate the safety and efficacy of three types of anesthesia methods in elderly patients with coronary heart disease undergoing unilateral lower extremity surgery.Methods Totally 65 patients with coronary heart disease of cardiac function Ⅰ-Ⅱ (NYHA),scheduled for undergoing unilateral lower limb surgery were randomly divided into three groups:local nerve block anesthesia of lumbar plexus plus the sciatic nerve (21 cases),general anesthesia (19 cases),epidural anesthesia (25 cases).Systolic blood pressure (SBP),heart rate (HR),pulse rate and blood oxygen saturation (SPO2) at 0 min,10 min,20 min,30 min,40 min after surgery at the end of the surgery were observed and recorded.The change of troponin Ⅰ (cTnI) at 3 day after surgery was observed.Visual analoguc scales (VAS) scores.movement reaction,the infortnation of muscle relax and corresponding management were recorded in order to detect anesthesia efficacy.Results The excellent and satisfactory rate of anesthesia efficacy of three groups were 17 cases (81.0％) and 4 cases (19.0％),17 eases (89.5％) and 2 cases (10.5％),22 cases (88.0％) and 3 cases (12.0％) (all P＞0.05).In epiduralgroup compared with other groups,SBP were decreased (both P＜0.05).cTnI in nerve stimulator group was decreased (all P＜0.05) at 1 and 3 day after surgery compared with general anesthesia group,and at 3 day after surgery,cTnI level in nerve stimulator group was lower than other two groups(all P＜0.05).Conclusions The nerve stimulator guided nerve block is the most safe method among general anesthesia and epidural anesthesia in elderly patients with coronary heart disease scheduled for lower extremity surgery.

Purpose To establish myocardial infarction model in rabbits and to evaluate cardiac function and pathological changes.Materials and Methods In 35 New Zealand white rabbits, the left anterior descending branch (LAD) of the coronary artery was ligated. The cardiac function was evaluated using echocardiography, and the blood serum brain natriuretic peptide (BNP) level was examined preoperatively, on postoperative day 1, and in 1 week, 2 weeks, 4 weeks and 8 weeks for comparison. Pathological sections and HE staining were performed to observe pathological changes. Results The death rate was 28.6% (10/35). There was progressive increase in left ventricular end systolic diameter (LVESD) and left ventricular end diastolic diameter (LVEDD) at 1 week, 2 weeks and 4 weeks (P<0.05). There was progressive decrease in left ventricular ejection fraction (LVEF) and left ventricular fractional shortening fraction (LVFS) at 1 day, 1 week, 2 weeks and 4 weeks (P<0.05). The BNP level started increasing in 1 day, peaked in 1 week, then gradually decreased but remained higher than preoperative level in 8 weeks (P<0.01). Pathological section showed typical myocardial cell degeneration, necrosis, ifbrosis, calciifcation and scar formation. Conclusion This myocardial infarction model is satisfactory with signiifcant decrease of cardiac function and increase of BNP level.

Objective To investigate the effects of thyroid stimulating antibody (TSAb) on the thyroid peroxidase (TPO) activity and its signal transduction pathways in cultured thyrocytes. Methods The TPO activity in primary cultured human thyrocytes was determined by amended guaiacol oxidation assay. At the same time, inhibitors of signal transduction were applied and the roles of cAMP/protein kinase A (PKA), phosphatidylinositol (PIP 2)/Ca 2+and tyrosine protein kinase (TPK) pathway on the TPO activity in cultured thyrocytes were observed. Results TSAb significantly enhanced the TPO activity in cultured thyrocytes, and the peak of TPO activity (360% of controls) reached with 4 mg/ml TSAb for 48 h. Addition of PKA inhibitor for blocking cAMP/PKA pathway decreased TPO activity by 79.2% (P

The teaching quality,clinical case teaching,innovations consciousness of teacher are three important items in how to develop students' creation thinking during the course of otolaryngology.

Objective To investigate the effect of heat treatment on the proliferation of, melanin synthesis and tyrosinase activity in cultured normal human melanocytes. Methods Normal human foreskin tissue was obtained by sterile circumcision and melanocytes were harvested by using methods for epidermal cell culture. Basic fibroblast growth factor (bFGF) was utilized as the primary mitogen to establish the culture system of normal human epidermal melanocytes. Masson-Fontana staining was proformed to identify melanocytes.Third-passage melanocytes were treated with hyperthermia at various temperatures (39 ℃, 41 ℃, 42 ℃, 43 ℃ and 45℃) for 1 hour a day for consecutive 3 days followed by the measurement of cell viability with MTT assay. The hyperthermia at optimized temperature was used to treat fourth-passage melanocytes for 1 hour a day for consecutive 3 days; subsequently, the tyrosinase activity were detected with L-Dopa as the substrate, and melanin content was determined in heat-treated and untreated (control) melanocytes. Results The hyperthermia at 42 ℃ exhibited the strongest promotive effect on the proliferation of melanocytes among these 5 hyperthermia conditions. After treatment with hyperthermia at 42 ℃ for 1 hour a day for consecutive 3 days, melanocytes showed an increment in tyrosinase activity by 36.4% and melanin synthesis by 78% compared with the untreated melanocytes (both P＜0.05). Conclusions Heat treatment can enhance the proliferation of cultured human melanocytes, promote their melanin synthesis and tyrosinase activity.