The preventive theory of traditional Chinese medicine means treating before occurrence or transference of diseases, which guides the modern health work. This paper analyses some health problem of citizens, proposes the solution and suggestion. Treating before occurrence or transference of diseases should not only be a medical ideal and the true approach is to strengthen system health education to citizens, especially all the students in school.

The paper reviewed the research cooperation on public health between China and US in 30 years since the establishment of Sino-US diplomatic relation, based on the project database of Peking University, and made out the comments on the benefits, shortages and expectation in future cooperation.

[Objective] To explore the status of chlorite pollution in drinking water due to chlorine dioxide , aswell as its causes and counter measures. [Methods]A water plant collecting surface water as raw water slightly pol-luted by organic compounds and B water plant collecting ground water without organic compounds pollution wereselected as observed objectives. Chlorine dioxide generators were used in both of A and B water plants, their rawmaterials was chlorite for A plant and chlorate for B plant. The levels of chlorite in treated water from these twowater plants were determined by amperometric titration. [Results]The levels of chlorite in treated water of A waterplant ranged 0.530～0.760 mg/L, 2.6～3.8 times of the standard value, with a over standard rate of 100％, thelevels of B water plant range 0.257～0.733 mg/L, 1.3～3.7 times of the standard value, with a over standard rateof 83.3％. [Conclusion] The treated water of A and B water plants presented higher pollution by chlorite, the by-product of chlorine dioxide disinfection.

Based on the findings of the past five decades, the seasonal regularity of respiratory disease was summed leading to respiratory tract diseases were summed up.

Pituitary tumors, originated from homoral adenohypophyseal cells, are very common in intracranial neoplasms. They are characterized by a wide range of biological behavioral related to hormoral and proliferative activities. Previous pituitary adenoma studies mainly devoted to histological and ultrastructural classification with immunohistochemical techniques. Molecular biology allowed new approaches, especially concerning the pathogenesis and progression. This article reviews the progress of these researches regarding chromosomes, oncogenes, antioncogenes, transgenic animal models and genetic therapy.

Invasive pituitary adenoma is a common pituitary adenoma invading nearby structures such as the sphenoidal sinus, ethmoidal sinus,upper clivus,sellar floor dura and bone. With the development of diagnosis neuroradiology, endocrinology,pathology and microsurgery,dramatic progress has been made on the pathogenesis, pre operative diagnosis and therapy of invasive pituitary adenoma.The development of pathology,molecular biological and medication and surgical therapy of invasive pituitary adenoma in the past few years is discussed in this paper.

The author in this text discusses the right of replicating medical records from the angle of law,and puts forward his own viewpoint,that is for the objective medical records,patients can copy them in any time,but for the subjective ones,it just depends on the cases. Generally speaking patients don't have the copy right about them,but when medical treatment trouble occurs,the patients should have the copy right to copy the sealed and stored medical records.

OBJECTIVE:To explore the effect of dexmedetomidine with different doses combined with ropivacaine on the bra-chial plexus block. METHODS:Totally 90 patients with upper extremity surgery of brachial plexus block were randomly divided in-to test group,control group 1 and control group 2. Test group was treated with 0.375%ropivacaine 40 ml+dexmedetomidine 100μg, brachial plexus injection;control group 1 was treated with 0.375% ropivacaine 40 ml+dexmedetomidine 50 μg,brachial plexus in-jection;and control group 2 was treated with 0.375% ropivacaine 40 ml,brachial plexus injection. Onset time of sensory and motor nerve block,block duration,postoperative pain time for the first time and pain score,analgesia duration,quality of analgesia and muscle relaxant,before anesthesia induction(T0),plasma cortisol concentrations in nerve block 10 min (T1),the start of surgery (T2)and incidence of adverse reactions were observed. RESULTS:The onset time of sensory and motor nerve block and postopera-tive pain score for the first time in test group werecontrol group 1>control group 2,plasma cortisol concentrations at T1 and T2 were higher than T0,and T2>T1>T0,test group0.05). CONCLUSIONS:Ropivacaine combined with 100 μg dexmedetomidine can effectively im-prove brachial plexus block and shorten the onset time of sensory and motor nerve block,with good safety.

[Objective]To analyze the causes of revision for bone tumor salvage limb operations and to explore the therapies.[Method]There were 4 cases of male,1 of female and with the mean age of 41.2 years old.The time between the first operation and revision was from 3 to 29 years.The common reason for revision was aseptic loosening,2 patients with sinus and 1 with fracture of prosthesis.During revision,the old prosthesis were implanted in 2 cases,the new one were used in the others.[Result]All patients were followed up with the mean time of 28 months,no patient died.The mean score of limb function was 21.5.[Conclusion]Revision should be performed as soon as the prosthesis aseptic loosening has been determined,and the satisfactory limb function could be obtained.

[Objective]To study the clinical matters of inactivated bone replantation with preservation of the epiphysis in children limb salvage with osteosarcoma.[Method]Eleven children(mean age 7.6 years old,5 male and 6 female)with osteosarcoma underwent inactivated bone replantation with preserving epiphysis following chemotherapy during 6 years.All lesions located in the distal femur.Seven were in Ⅰ type on MRI classification,4 in Ⅱ type.Two courses of the same protocol as preoperative chemotherapy were administered postoperatively.[Result]The operative time were 3~4 hours.The bleeding amount were about 300~500 ml.No complications occurred in operation and incisions healed well in all patients.Eleven patients were done follow-up from 10 to 72 months.Functions of the affected limbs were satisfatory.Local tumor recurrence was seen in one case and lung metastasis in two,3 patients died of the disease.Blot became flexible and inactivated bone fractured in one,respectively.[Conclusion]Inactivated bone replantation with preserving epiphysis for osteosarcoma in children is propitious to recover limb function and keep limb length.The main measures of preventing complications include no-touch technique in operation,incision drain completely,prolonging time of affected limb external fixation and safeguarding the affected limb during postoperative function exercise.