Objective To study the mechanism of arsenic on human lung adenocarcinoma cells.Methods MTT,FCM and RT-PCR tests were used to investigate apoptosis levels induced by arsenic trioxide and the effect on LRP mRNA expression.Results 1.0μmol/L and 3.0μmol/L arsenic trioxide can decrease LRP mRNA expression.Conclusion Low concentration As_2O_3 may improve apoptosis of lung caner by decreasing LRP mRNA expression.As_2O_3 may be used to treat lung cancer but the results are not better than cisplatin.

Objective To study the effect of selection of indications in percutaneous laser disc decompression(PLDD).Methods Lumbar disc herniation treated by PLDD with satisfactory and unsuited indications in 34 cases respectively were matched studied.Results The curative effect was 85.3% and 55.9% in satisfactory indication group and unsuited indication group respectively (?~2=5.06,P

Objective To study of percutaneous laser disc decompression(PLDD)in the patients of lumbar disc herniations.Methods 66 patients were treated with PLDD.The mean age of the 48 male and 18 female patients was 39.3 years old.Results 58 patients of all,or 87.9% showed excellent or good result.15 patients(78.9%)showed excellent and 2 patients(10.5%) were good,2 patients(10.6%) were fair or poor under 30 year old.15 patients(44.1%)showed excellent and 17(50.5%)patients were good,2(5.9%)patients were fair in 31~50 years old.2(15.4%) patients showed excellent and 7(53.8%)patients were good,4(29.8%)patients were fair or poor over 51 years old.Conclusion PLDD is safe and convenient method of treating lumbar disc herniations.

BACKGROUND: Percutaneous laser disc decompression(PLDD) is a new technology developed to treat lumbar herniated disk inrecent years; however,only limited literature has been reported about cohort study on its indications.OBJECTIVE: To treat patients with lumbar disc herniations by PLDD and evaluate the effects of PLDD in releasing painandimproving lumbar function after operation.DESIGN: Non-randomized concurrent controlled trial based on thepatients.SETTING: Department of Radiology of the 474 Hospital of Chinese PLA.PTICIPANTS: This study recruited totally 173 patients ( 101 males and 72 females aged from 18 to 75 years) who received PLDD in the Department of Radiology of the 474 Hospital of Chinese PLA from July 1998 to August 2002 and were followed up for over one year.METHODS:The 173 patients were divided into good indication group (Group A, n = 139) and poor indication group(Group B, n =34). Group B was further divided into extrusion group(Group B1 of 8 patients),lumbar canal stenosis group(Group B2 of 15 patients) and other conditions group (Group B3 of 11 patients). VAS scoring criteria and modified Macnab criteria were used to evaluate the curative effects.MAIN OUTCOME MEASURES: Primary results: the degree of pain and lumbar function. Secondary results:the success rate of puncture as well as adverse events and side effects.RESULTS: The success rate of puncture was 96. 3％ for performing through L5 - S1 and 100％ through L3-4 and L4-5. In Group A, excellent postoperative effects were seen in 63 cases, good in 51 cases, fair in 20 cases and poor in 5 cases, with 82.0％ excellent and good rates. The excellent and good rate in Group B was 55.9％. Postoperative back pain could be relieved several days later. Other complications such as disc infection,psoas hematoma,rupture of colon,injuries of nerve roots and bloodvessels did not occur. There was a significant difference between Group A and Group B(x2=10.38, P ＜0.05).CONCLUSION: (① PLDD is a convenient, safe and reliable procedure in treating lumbar disc herniation because of its high success rate, satisfactory results and fewer complications.② Proper selection of indications helps improve the curative effects of lumbar disc herniation.

Objective To analyse the rate of coincidence to suspected coronary artery disease (CAD) patient between positive exercise treadmill testing (TET) and coronary angiography (CAG) test.Method Two hundred and sixty-eight chest pain patients positive in TET were performed CAG test,coronary stenosis exceed 50% was diagnosed CAD. Results One hundred and seventy-six patients (65.67%) was diagnosed by CAG, 105 male and 71 female in them. Ninety-two (34.33%) patients was negative in CAG test. The false positive rate of TET between post-menopause patients (30.12%, 25/83 ) andmale patients (28.08%, 41/146) was no significant difference(P > 0.05 ); the difference of false positive rate between pro-menopause patients (66.67%, 26/39) and male patients (28.08% ,41/146) was statistical significance (P < 0.01 ). Conclusions The positive rate of CAG can be greatly improved by screening the chest pain patients though TET before CAG, if the positive in TET performed CAG only. TET false positive rate of pro-menopause female is significantly higher than post-menopause female or male.

BACKGROUND: Percutaneous laser disc decompression (PLDD) and automated peroutaneous lumbar discectomy (APLD) have been widely used in the treatment of lumbar intervertebral disc prolapse.OBJECTIVE: To compare the symptoms and improvements of patients after receiving PLDD and APLD and analyze the characteristics of the two operations.DESIGN: A non-randomized concurrent controlled observation.SETTING: The 474 Hospital of Chinese PLA.PARTICIPANTS: Totally 106 inpatients with lumbar and leg diseases of different extent were selected from the 474 Hospital of Chinese PLA as the subjects. The patients were divided into APLD group( n =46) and PLDD group( n = 60) according to different intervention measures.INTERVENTIONS: APLD group: The dilating tube was probed at different levels, and working cannula of 4.8 mm was retained at last. The fenestration was made at the fibrous rings with the trepan, then nucleus pulposus of about 1 - 5 g was clipped by the pliers for nucleus pulposus. Electric discectomy apparatus was used to aspirate the nucleus pulposus of about 0.5 - 1.5 g at 600 - 300 rounds per minute. The electric discectomy apparatus and working cannula were pulled out after operation. PLDD group: The stylet was removed and optical fibers were inserted with the naked front segment (5 mm) com pletely going beyond the needle end. Cautery was made with 15 W laser for 1 s once a time at the interval of 4 s. The total output power of laser was adjusted between 1 200 - 1 700 joules. The patients lay at supine position to be examined for pain relief and functional recovery, and then they were sent back to the ward with flatbed cart for bed rest of 3 days. Therapeutic effects were evaluated according to modified Macnab' s criteria. The curative effect was presented as percentage.operations.excellent(47.8% ), 18 good(39. 1% ), 5 passable (10.9%), and 1 poor APLD group, there were 29 cases of excellent(48.4% ), 20 good (33.3%), 9 passable (15.0%), and 2 poor(3.3% ), with 81.7% excellent the two groups. Pain in the lumbar part usually sustained for several days,then was relieved and disappeared gradually. One patient in APLD group had infection of intervertebral disc. No complications occurred in PLDD group.CONCLUSION: PLDD and APLD do not differ significantly in excellent and good rate of treating prolapse of lumbar intervertebral disc. Compared with APLD, PLDD is a more convenient and minimally invasive technique causing fewer complications.

Objective To investigate the clinical efficacy and safety of the high-intensity focused ultrasound therapy in patients with colorectal liver metastases. Methods 28colorectal lesions in 16 patients with liver metastases after HIFU treatment lines observed patient vital signs,the main organ,imaging studies (CT or MRI,etc. ) ,complications and prognosis of cancer cases. Results All patients with stable vital signs after treatment, liver, kidney function was normal,6-month follow up, six more than 80% reduced lesion size,lesion size decreased in 18 of 30% to 50% ,4tumor volume did not change significantly; 16 patients, 1 patient was lost. 15 cases were followed uPfor 6 to 24 months,5 patients were transferred because of lesions disseminated in death within 6 months after surgery, calculated with the Kaplan-Meier median survival time was 13 months; 1 patient skin burning streak marks, healed after 1 week after treatment. 1 patient treatment areas of the chest skin, mild subcutaneous edema. Conclusion The treatment of patients with liver metastasis of colon cancer lesions was a non-invasive, safe and effective treatment.

Objective To study the morbidity rate of and relevance to coronary stenosis in cerebral infarction patients. Methods CT coronary angiography was performed in 112 cases of cerebral infarction after CT cerebral angiography. Multivariate logistic regression analysis was carried out between the clinical data and coronary stenosis. Results In 112 cases receiving CT cerebral angiography, the morbidity rate of coronary stenosis was 46.4%. In 95 cerebral infarction patients, the morbidity rate of coronary stenosis was 51.6%. Multivariate logistic analysis showed that age, hypertension, hyperlipeidemia, significant narrowing of cerebral artery were identified as independent predictors for coronary stenosis. Conclusions Heart examination with 64 row CT should be routinely performed after cerebral angiography in cerebral infarction patients,especially in those with age greater than 65 years, hypertension, hyperlipoidemia and significant narrowing of cerebral artery so as to detect coronary stenosis early.

Objective To compare the ear baric function between 4000m altitude chamber test with inhaling air and 6900m altitude chamber test with inhaling pure oxygen.Methods Eleven healthy male volunteers attended two tests as two groups by self-comparison. As the air group the volunteers inhaled air at 4000m, while as the pure oxygen group they inhaled pure oxygen at 6900m altitude, and the time interval between the two tests was more than two weeks. During the test, the volunteers breathed air or pure oxygen at random for 1h, and then were exposed at a speed of 20m/s to the target altitude for 5min. Hereafter they were sent back to the ground at the same speed. The changes of subjective symptoms, degree of tympanic congestion, acoustic immitance index and pure-tone auditory threshold were recorded before and after the test. The acoustic impedance index and pure-tone threshold were statistically analyzed.ResultsFour volunteers (4 ears) in air group and 7 volunteers (7 ears) in pure oxygen group reported ear pain in altitude chamber exposures, respectively. The pain-triggering altitude was higher in the pure oxygen group. Immediately after tests, there were 3 (3 ears) and 5 volunteers (5 ears) with Ⅲ degree congestion of the tympanic membrane in the two groups respectively. Four volunteers (6 ears) developed gradually aggravated hemorrhages after altitude exposure. And the tympanic membrane congestion difference between groups was statistically significant at 3 and 24h after tests (P<0.01). The type A tympanogram appeared in 11 (15 ears) and 11 (14 ears) volunteers respectively immediately after tests. The increase of static compliance value was significantly greater in pure oxygen group than in air group immediately after tests (P<0.05), the decrease of middle ear pressure was more significant in pure oxygen group than in air group at 3 and 24h after tests (P<0.05). Both the two altitude exposure tests resulted in eustachian tube dysfunction. At 3 and 24h after the tests, the increase of individual frequency pure-tone threshold was significantly higher in pure oxygen group than in air group (P<0.05).Conclusion Breathing pure oxygen and lifting height could increase the screening degree of ear baric function test in hypobaric chamber, and have greater influence on degree of tympanic congestion, acoustic immittance and pure-tone auditory threshold in 24 hours.

Methicillin-resistant staphylococcus aureus (MRSA) has become the main pathogen for hospital and community acquired infections. Based on the resistance mechanism of MRSA, this article reviews the reducing and eliminating effect of Chinese herb extracts on bacterial drug resistance, by means of PBP2a protein binding, γ-lactamase, plasmid, efflux system, cell structure and biofilmdamage.