The basic principles of piezoelectric quartz crystal immunosensor are reviewed. Its characteristics and applications in biomedicine are summarized. The feasibility of its application in detecting cardiac troponin I (cTnI) is briefly analyzed. There's no need of any signs and segregation steps in the technique, so the instrument is simple and easily-operated. Besides, it has a bright application future for its merits of rapid detection and precise quantification.

Objective This study was aimed to evaluate the remote real-time transmission 12-lead electrocardiogram system on door-to-balloon time in patients with ST-segment elevation myocardial infarction.Methods We retrospectively analyzed the consecutive patients with STEM I who had accepted primary percutaneous coronary intervention (PCI) in the chest pain center of our hospital from February 2012 to July 2012.The study group consisted of patients with pre-hospital ECG,while the control group included patients without pre-hospital ECG,Their door-to-balloon time and door-to-catheter room time,mortality w ere compared.Results Totally 60 consecutive patients who had received primary PC I for STEMI were evaluated.Among them,35 patients were hospitalized with pre-hospital ECG while the other 25 patients without ECG.The Pre-hospital ECG was associated with a significautly shorter median door-to-balloon time (38 min vs.94min;P ＜0.01),The proportion of patients received balloon dilation within the guidelinerecommended 90 min timeframes Was significantly higher in pre-hospital ECG group than in non pre-hospital ECG group (94.6％ vs.60％;P =0.001).No difference was observed in mortality between the two groups (5.7％vs.4％;P ＞ 0.05),Significant difference was seen in the median hospital time in study group (5 compared with control group (7day) (5 day vs.7 day;P ＜ 0.01).Conclusions The remote real-time transmission 12-lead electrocardiogram system is associated with a significantly shorter door-to-balloon time in STEMI patients.The remote real-time transmission 12-lead electrocardiogram system is recommended in patients suspected STEMI.

To investigate the effect and mechanism of intravascular brachytherapy with 192 Ir on expression of type I collagen after angioplasty. Restenosis model of domestic miniswine was employed.After angioplasty, the iliac arteries were randomized to brachytherapy group ( n =6) , which were treated with 20 25Gy of 192 Ir, and control group ( n =18). The target vessels were harvested at the 12 th week and the 24 th week after angioplasty. Immunohistochemistry and in situ hybridization were used to detect proteins of type I collagen, metalloproteinase 1 (MMP 1) and its tissue inhibitor (TIMP 1), and mRNA expression of type I collagen. The results showed that the protein and mRNA of type I collagen, and the ratios of TIMP 1/MMP 1 were lower in brachytherapy group than in control group. The peak of mRNA expression of type I collagen was at the 24 th week in control group and at the 12 th week in brachytherapy group, respectively. It suggested that intravascular brachytherapy with 192 Ir affects the metabolism of extracellular matrix by inhibiting the synthesis of type I collagen and regulating the activities of MMP 1 and TIMP 1.

Chest Pain ; diagnosis ; Goals ; Humans ; Pain Clinics

Objective To evaluate puncture technique in thoracic endovascular aortic repair with abdominal aortic aneurysm and assess the feasibility and safety of using a pre-close technique for puncture and closure of femoral access sites. Methods From May 2010 to August 2013, the pre-close technique which involved two 6 F per-close ProGlide devices deployed in the femoral artery before upsizing to a 18-25 F sheath and one or two deployed before upsizing to a 14-16 F sheath were applied to 42 patients with abdominal aortic aneurysm (group A). Forty-seven patients using surgical femoral cutdown from December 2006 to April 2010 were enrolled into group B. The rate of technical success, time from procedure to the aortic delivery, operation time, low limb braking time, local complication, time from procedure to discharge, local vascular diameter after 3 months was evaluated and compared between two groups. Results There was no significant difference in endograft external diameter between two groups ( P>0.05). The rate of technical success was 97.62%(41/42) in group A and 95.74%(45/47) in group B, and there had no significant difference (P>0.05). Time from procedure to the aortic delivery, operation time and time from procedure to discharge in group A were significantly shorter than those in group B: (21.79 ± 5.79) min vs. (41.37 ± 11.79) min, (127.66±37.83) min vs. (157.84±42.71) min, (6.59±1.89) d vs. (9.14±2.57) d, P<0.05. The incidence rate of local complications, low limb braking time, and local vascular diameter after 3 months had no significant difference between two groups:7.14%(3/42) vs. 8.51%(4/47), (8.51± 1.83) h vs. (8.38±1.79) h, (1.05 ±0.36) mm vs. (0.98 ±0.31) mm, P>0.05. Conclusion The puncture technique with per-close ProGlide is safe and effective in percutaneous endovascular aortic repair which can be adopted as an alternative technique of surgical femoral cutdown approach in patients with abdominal aortic aneurysm.

Objective To investigate the changes and significances of the level of serum Fibulin-3 and correlation between Fibulin-3 and branchial-ankle Pulse Wave Velocity (baPWV) in patients with hypertension. Methods A total of 50 patients with hypertension and 38 healthy people were enrolled finally, whose fasting blood were collected. The levels of Fibulin-3、MMP-9 were detected by enzyme-linked immunosorbent assay. The baPWV was detected by pulse wave velocity automatic analyzer. Results The level of serum Fibulin-3 in hypertension was lower than the control group significantly (P < 0.001). There was no significance of serum MMP-9 in the two groups. The baPWV in hypertension was higher than the control group.Correlations between the level of Fibulin-3 and baPWV were significant (r = -0.324,P = 0.006). While correlations between the level of MMP-9 and baPWV had no significance (r=0.003,P=0.968). Conclusion The level of serum Fibulin-3 and baPWV can be used as index of functional changes in the early stage of hypertensive vascular remodeling, and may be applied for forecasting the organ damage in hypertension.

Objective To investigate the correlations between the time of thoracic endovascular aortic repair (TEVAR) and prognosis in patients with type B acute aortic dissection (AADB). Methods The clinical data of 156 AADB patients with TEVAR was retrospectively analyzed and divided into 3 groups according to the time from onset of symptom to TEVAR:less than seven days was deifned as group 1 (G1, n=87), seven days to fourteen days group 2 (G2, n=48);more than fourteen days was group 3 (G3, n=21). The status of aortic reconstruction at three months TEVAR, in-hospital mortalities, mean hospital expense and length of stay were compared among three groups. Results Before TEVAR, there was no signiifcant differences in the ratio of smallest true lumen diameter and largest false lumen diameter amony the three groups (0.47±0.33, 0.42±0.18, 0.47±0.27, respectively, P>0.05). At three months after TEVAR, the ratio of largest true lumen diameter and largest false lumen diameter among the three groups was signiifcantly greater in group 1 (1.76±0.51) than group 2(1.42±0.30) and group 3(1.34±0.34, P < 0.05), when there was no signiifcant difference between the later two groups. Complete aortic reconstruction (8 from group 1 and 4 from group 2) was achieved in 12 patients at 3 months after TAVAR. Eight patients died during hospitalization, 5 from visceral ischemic, 2 from proximal aortic dissection, one patient from sudden death. Compared with G3, the hospital expense of group 1 and group 2 was cut down about ￥20000. Length of stay was signiifcant greater in group 3 than in group 1 and group 2 (P<0.05). Conclusions Early TEVAR for AADB was safe and beneifcial for aortic reconstruct and reducing the hospital expense and length of stay.

Objective:To construct a human Fab phage antibody library and to obtain some recombinant clones which can express Fab fragment antibody against ? 1-adrenergic receptor.Methods:Fd heavy chain gene and ??? light chains gene of IgG obtained by RT-PCR from peripheral lymphocytes of DCM patients whose anti ? 1-AR antibodies are present were cloned into pComb3 vector and the human Fab phage antibody library was constructed.The library was panned by phage display technology with ? 1-ARECⅡ as antigen.Results:A human Fab phage antibody library with 1.4?10 6 capability was constructed successfully,a positive clone against human ? 1-AR was screened from the phage antibody library.Conclusion:The recombinant clones which express Fab antibody against ? 1-AR can be obtained by phage display technology.

Objective This study intends to explore the impacts of the establishment of chest pain center(CPC) on the door-to-balloon(D-to-B) time in patients with ST-elevation myocardial infarction (STEMI) by different transfer ways to hospital. Methods A regular CPC and a regional cooperative network were established based on the pre-hospital transmitted real-time 12-lead electrocardiogram system. The STEMI patients were divided into the following three groups by the different transfer ways to hospital before and after the establishment of chest pain center:self-referral groups (group A1, n=52, and group A2, n=65), EMS (emergency medical service ) groups (group B1, n=31, and group B2, n=92) and transfer PCI groups (group C1, n=23, and group C2, n=552). The mean D-to-B time and the rate of D-to-B below 90 minutes were compared between before and after the establishment of CPC and the reasons of reperfusion delay were analyzed. Results There were no statistical differences of the average D-to-B time [(123±78) min vs.(140±123)min, P > 0.05] and the rate of D-to-B time below 90 min (44.2%vs. 46.2%) between group A1 and group A2. The average D-to-B time was significantly shortened in group B2 [(89±66)min] while compared with that in group B1 [(155±115)min, P<0.05] and the rate of D-to-B time below 90 min was remarkably elevated in group B2 compared with that of group B1 (69.6%vs. 32.3%, P<0.05). The average D-to-B time was significant shorter in group C2 than in group C1 [(77±43)min vs. (337±662)min, P<0.05] and the rate of D-to-B time below 90 min was remarkable higher in group C2 than in group C1 (75.7%vs. 21.7%, P<0.05). The longer D-to-B time in self-referral groups was mainly due to the delay of getting informed consent before PCI when occupied catheterization laboratory was the major cause of reperfusion delay in EMS groups and transfer PCI groups. Conclusions The establishment of CPC may significantly shorten the D-to-B time and increase the rate of D-to-B time below 90 min for these patients admitted by EMS and transferred from non-PCI hospitals. However, the pathway for the self-referral patients should be further modified.

Objective To explore the success rate and the risk of establishment of the acute myocardial infarction model between the beagle dogs and the mini-pigs by interventional technique ,further to provid theoretical basis for choose a more suitable animal model .Methods 6 dogs and 6 mini-pigs were anaesthetized ,then underwent the coronary arteriography via femoral artery .After is-chemic preconditioning the coronary balloon was inflated to occlude the middle left anterior descending coronary for 180 minutes . The electrocardiogram was examined throughout the operation and the pathological sections were examined until the animals were executed one week later .Results All beagle dogs survived ,while 1 case of mini-pigs dead(1/6) .There was 1 cases(1/6) of beagle dogs had acute myocardial infarction ,while 5(5/6)cases in mini-pigs .All mini-pigs had malignant arrhythmia(6/6) but never seen in beagle dogs .The time needed for building a model was similar between the two groups ,the difference had no statistical signifi-cance(P>0 .05) .Conclusion The risk of establish myocardial infarction model in mini-pigs is higher than beagle dogs ,but the suc-cess rate is still high ,it might be the better choice .