Objective To study the evaluation of Bi-level positive pressure device to deliver nasal pressure support ventilation in severe bronchial asthma patients.Methods Sixty and fore severe bronchial asthma patients was divided into control(group A)and treatment group(group B),the group A(n=32)was given commonly treatment and that was breathing oxygen with nasal ventilation,the group B(n=32)was given commonly treatment and Bi-level positive pressure device to deliver nasal pressure support ventilation.The symptoms and signs were examined and the pH,PaO2,PaCO2,SaO2 and PEF were detected two groups.Results Compared with group A the indexes:the symptoms and signs of group B were affected better than group A,the PEF,PaO2,SaO2 of group B were significantly evaluated than those in group A(P

Objective:To observe influence of preinfarction angina pectoris (PAP)on primary ST elevation acute my-ocardial infarction (AMI).Methods:A total of 280 patients with primary ST elevation AMI received coronary angi-ography (CAG)within 24h after symptoms occurred,and they received ECG and QRS scoring on hospitalization. According to PAP or not,patients were divided into PAP group (n=102)and non PAP group (n=178).According to attack to CAG time,patients were divided into early stage group (<2h,n=60),mid-term group (2~6h,n=150)and advanced stage group (6~24h,n=70).Results:QRS score of PAP patients [(2.4±2.4)scores]was sig-nificantly lower than that of non PAP patients [(3.2±3.0)scores],percentage of high QRS score in PAP group (8.0%)was also significantly lower than that of non PAP group (18.4%),P<0.05 both.In early stage group, there was no significant difference in QRS score [(2.0±1.8)scores vs.(2.6±2.8)scores,P=0.35]between PAP and non PAP patients;The QRS score of PAP patients [(2.0±2.1)scores]was significantly lower than that of non PAP group [(3.0 ±3.0)scores]in mid-term group,P=0.03;in advanced stage group,the QRS score all signifi-cantly rose in PAP patients [(4.1 ±3.3)scores]and non PAP patients [(5.5±2.9)scores],P=0.13;QRS score gradually rose along with onset time prolonged in non PAP group.Conclusion:Preinfarction angina pectoris can de-lay progress of acute myocardial infarction and expand therapeutic window of reperfusion.

Objective To study the value of blood glucose changes and the severity of the disease in patients with the systemic inflammatory response syndrome(SIRS).Methods In 328 SIRS patients without diabetes,intravenous blood glucose was monitored before open intravenou channel and subsequently 3~8h after intervals.The blood glucose was reviewed if glucose was abnormal 24h later.Results The blood glucose was higher than normal in 287(87.5%)patients with SIRS,of which 44 cases were death(13.4%).The higher the blood glucose level was,the higher the mortality rate was.Conclusion Blood glucose of patients with SIRS was elevated.If the blood glucose was 3 times higher than the normal,patients with SIRS had a higher mortality rate.

Objective To study the changes and their value of ultrasonic myocardial integrated backscatter (IBS)in normal control and patients with super-acute phase of myocardial infarction. Methods There were 38 cases of acute myocardial infarction(AMI)patients in the super-acute phase(time ＜ 2 h infarction)and the acute phase(infarction time ＞ 2 h,typical ECG changes)for myocardial ultrasonic backscatter parameters detection,an additional 25 cases as healthy control group. The myocardial infarction region and non-infracted myocardial tissue region average duration of cardiac cycle of integrated backscatter(IBS)were measured,and IBS adjusted value (IBS%)was calculated as the ratio of myocardial IBS to the pericardium,the difference of IBS at end-diastolic and late systolic was used as cyclic variation of IBS(CVIB). The ratio of IBS to pericardial CVIB was used as its adjusted value(CVIB%). Over the same period for the electrocardiogram,myocardial enzymes and cardiac troponin I were measured. Results When ECG was not typically changed in patients with super-acute phase AMI,the IBS values significantly increased in the myocardial infarction region than the normal control group (43. 7 ± 10. 8)dB vs.(22. 6 ± 4. 6)dB,P ＜0.01),and CVIB was significantly lower than that in the normal control group(10. 2 ±2. 6)dB vs.(13. 2 ± 3.8)dB,P ＜ 0.01]. The IBS in the acute phase in patients was significantly higher than that in the normal control group and those non-infarcted areas,and CVIB was significantly lower than that in the normal control group and those in the non-infarcted areas. The changes were consistent with the ECG changes. Conclusions Ultrasonic backscatter parameters might be helpful for diagnosis of hyperacute period of AMI,and the determination of the scope and extent of AMI.

Objective:To investigate the three-dimensional accuracy of four impression materials for fixed denture:silicone(OX),hydrocolloid(HT) and two kinds of alginate impression(FC and ZS).Methods:Ten plaster replication models for each impression materials were made on the same metal master cast respectively, vertical and horizontal dimensions between landmarks on the masters and plaster casts were measured with an optical microscope. ANOVA was used to compare the measurements among the materials.Results:The difference between the masters and casts in horizontal distances measured on ZS produced models was bigger than that on other impression material produced ones (P<0.01) and beyond clinical requirment.The difference between the masters and casts in all measured dimensions on OX produced models was the smallest.Conclusion:Alginate paste is not accurate enough for denture model,while silicone is.The hydrocolloid material is relatively accurate.

Objective:To investigate the stress distribution of the edentulous maxilla with unilateral maxillary defect after implant rehabilitation under occlusal loads.Methods:Three dimensional finite element model of the edentulous maxilla with unilateral maxillary defect was build.The stress distribution of the edentulous maxilla under occlusal loads with computer simulated implant rehabilitation was investigated.Results:Regardless of load manner,the stress of the bone around 1 were high when just healthy side implanted,but the stress reduced after implantantion in health side combined with the implantation in zygoma in defect side.Conclusion:Implantation in health side combined with that in zygoma in defect side can reduce the stress of the bone around the implant.

Objective: To develop titanium posted keeper removable magnetic attachment and to decrease its influence on magnetic resonance imaging(MRI). Methods: Pre fabricated soft magnetic alloy pin cap keeper(PSAPK), casting non precious alloycoping keeper(CNPAK), casting precious alloy coping keeper(CPACK), titanium post keeper(TPK) and titanium post(TP) were prepared and applied on the maxilla of a volunteer, MRI was taken and measured. Results: ①The attachments producing artifacts in MRI from the biggest to the smallest were listed in following rank: PSAPK, CNPAK, CPACK, TPK and TP. ②After removing the keeper from titanium post keeper, the post had no artifact on MRI. ③The artifact was the smallest taken with SE sequence. Conclusion: Titanium post keeper is an effective way to solve the artifact problem and will bring benefits to the patients who need MRI examination of head.

Objective To investigate the efficacy and mechanism of hyperbaric oxygen combining conventional therapy on persistent vegetative state ( PVS).Methods Sixty-two cases of PVS patients were treated with hyperbaric oxygen ( HBO ) combinting with conventional therapy.( 1 ) Hyperbaric oxygen therapy:hyperbaric oxygen chamber was adopted and the air pressure was 0,18 -0.20 MPa.The patients breathed pure oxygen for 30 min,2 times per day with a 10 min interval,and continued for 10 days as a course with an average of 4 to 6 courses.(2)Conventional therapy:All patients received drug treatment in hyperbaric oxygen therapy at the same time,including hemostasis,dehydration,anti-infection,nerve cell nutrition agents,wake promoting agents and supportive therapy.All patients were divided to three groups according to the course of disease:26 - 59 days in A group,60-119 days in B group,120 -268 days in C group,and the relationship between disease course and HBO treatment efficacy was analyzed.Results Afer HBO combining conventional therapy,27 cases (43.5％) were recovered,18 cases(29.0％ ) had obvious effect,8 cases( 12.9％ ) had effect,9 cases( 14.5％ )were inefficacy.The efficiency related to the course of disease.The total efficiency rate was 85.5％.The efficacy of HBO treatment had significant difference in A,B and C group ( 96.2％,62.5％ and 41.7％ in A,B and C group respectively,x2 =24.83,P ＜ 0.01 ).The shorter course indicated the better efficacy.Conclusion Hyperbaric oxygen combining conven.

Objective:To explore the differences of CBCT image gray value of commonly used dental materials.Methods:CBCT was used to scan 36 kinds of commonly dental material blocks,the tomographic image gray value was measured by Mimics software.Re-sults:CBCT image gray values of the materials were obtained.There were differences of the gray values of the materials not only among the different types,but also among the different varieties of the same materials.Conclusion:The discipline of CBCT image gray value differences of commonly used dental materials provided an objective basis for the establishment of 3D digital model including dental ma-terials.

Objective:To study the stress distribution of Magsoft (cushion type) and Magnedisk magnetic attachment. Methods: 2 overdentures were prepared on each of 5 edentulous jaw models. The overdentures were pared and retained with Magnedisk and Magsoft magnetic attachments respectively.Photoelastic analysis was used to study the stress distribution for the implanted complete overdentures. Results: Under the same load, around the implants, the stress under the overdentures retained with Magsoft was lower than that with Magnedisk. Compared with Magnedisk, the stress around the abutments under the overdenture retained with Magsoft were distributed in a more even manner. Conclusion: Magsoft magnetic attachment has better biomechanical characteristic than Magnedisk and can distribute stress more evenly throughout the whole supporting structure for its special cushioned design.