BACKGROUND:At present, an increasing number of bone graft materials are inactivated using peracetic acid-ethanol solution, but there is no report on whether virus inactivation using peracetic acid-ethanol solution has effects on osteogenic induction of demineralized bone matrix. OBJECTIVE: To explore the effects of virus inactivation using peracetic acid-ethanol solution on the osteogenic activity of demineralized bone matrix. METHODS: Long bones of Sprauge-Dawley rats were selected to make demineralized bone matrix meal. A part of bone meal was placed into gelatin capsules and sterilized by60Coγ irradiation as control group; another part of bone meal was placed into gelatin capsules folowing virus inactivation using peracetic acid-ethanol solution, and then sterilized using60Coγ as experimental group. After that,40 Sprauge-Dawley rats were enroled, and gelatin capsules in the experimental and control groups were respectively implanted into the bilateral psoas muscles of the lumbar spine. At 2, 4, 6, 8 weeks after implantation, the bone grafts were removed for gross and histological observations. RESULTS AND CONCLUSION:At 8 weeks after implantation, the bone mass in the experimental group was not intact in shape with scattered particles, and under light microscope, a few of osteoblasts and new vessels were seen; the bone mass in the control group had hard texture and complete morphology, and under light microscope, mature bone trabeculae wrapped with osteoblasts and new vessels were visible and there were ful of fat cels and bone marrow cells between the bone trabeculae. The number of new microvessels in the experimental group was lower than that in the control group at different time (P < 0.001); at 8 weeks after implantation, the calcium content, alkaline phosphatase content, inorganic phosphorus content and new bone growth rate were all lower in the experimental group than the control group (P < 0.001). These findings indicate that peracetic acid-ethanol for virus inactivation has some negative effects on the osteogenic induction of demineralized bone matrix.

Objective To explore the effects of balloon dilatation on esophageal motility in patients with achalasia. Methods Forty eight patients were diagnosed as having achalasia by clinical features, barium radiography, endoscopy and esophageal manometry (PC polygraf HR, Medtronic). The following parameters were evaluated: the symptom score, the maximal width of the esophagus (MWE) on barium radiography, lower esophageal sphincter pressure (LESP), lower esophageal sphincter relaxation rate (LESRR) and the contraction amplitude of esophageal body before and after dilatation at 4 weeks and 12～24 weeks. Results (1) Parameters of symptom score and the maximal esophagus width were significantly decreased ( P

Objective To investigate the pathophysiology mechanism in belching by using high resolution manometry combined with impedance monitoring.Methods Ten belching patients (four male and six female,ages ranged from 28 to 50 years) received high resolution manometry combined with impedance monitoring.The characters of esophageal motility at rest,swallowing and belching and the possible mechanism of belching were analyzed.Results Nine of 10 patients had esophageal peristaltic dysfunction,displaying as non-peristaltic contraction such as non-conduction contraction,interrupt contraction and dropping contraction.The pressure of the lower esophageal sphincter (LES) of three patients decreased.LES of one patient had incomplete relaxation.Nine of 10 patients were supragastic belching,in which air moved rapidly into esophagus and reversed exited from the mouth in one second.Among nine supragastic belching patients,the pleural pressure of seven patients increased during inspiration,upper esophageal sphincter relaxed and air was mistaken into the esophagus.The pharyngeal muscle contracted in two patients and the air was forced into esophagus.Of all the patients,intragastric and esophageal pressure increased through abdominal muscles and diaphragm contraction and air exited from the mouth.Conclusions The results of this study indicated that there was esophageal peristaltic dysfunction in belching patients.There was no frequently air swallowing in excessive belching patients,the typical belching model was supragastic belching.

Objective To investigate the effect of autonomic nervous dysfunction on pathogenesis of gastro-esophageal reflux disease(GERD).Methods Autonomic nervous function(ANF) was assessed by cardiovascular reflex tests in healthy volunteers and patients with GERD;Based on the ANF test results,the relationship between the impairment degree of autonomic nerve and the esophageal motility or the reflux esophagitis or the score of reflux symptoms was investigated.Results ① 59.5% of patients with GERD have abnormal ANF and the rate in GERD patients is much higher than that in healthy volunteers,parasympathetic nerve impairment is predominant.② The score of reflux symptoms in patients with normal ANF is significantly lower than that in patients with abnormal ANF(6(2,7.6)vs 9(4.1,17),P

ObjectiveTo compare the difference effects on the proximal stomach in rapid(intake rate 100 mL/min) and slow(intake rate 15 mL/min) LNLT.Methods Forty healthy subjects received both the rapid and slow LNLTs.The caloric density of the nutrient was 1 kcal/mL. The TVDRI and MVDRI were recorded,and the corresponding TVPS and MVPS were measured by B-ultrasound.Results(1) There were positive correlation was identified between TVDRI and TVPS,and between MVDRI and MVPS in both slow and rapid LNLTs.(2) TVDRI and MVPS in slow LNLT were significantly smaller than those in rapid LNLT,but MVDRI was significantly larger in slow LNLT than that in rapid LNLT.(3) TVDRI was much closer to TVPS in slow LNLT than those in rapid LNLT.But MVDRI was much closer to MVPS in rapid LNLT than those in slow LNLT.Conclusion Both slow and rapid LNLTs could be used to evaluate the accommodation to a meal and visceral sensitivity of the proximal stomach.The visceral sensitivity is related to the accommodation function.TVDRI of slow LNLT is more sensitive in estimating the visceral sensitivity of the proximal stomach;MVDRI of rapid LNLT is more accurate in estimating the accommodation of the proximal stomach.

Objective To evaluate influencing factors of the long-term maintenance therapy in patients with gastroesophageal reflux disease (GERD).Methods 156 Patients with GERD were divided into on-demand therapy group and continuous therapy group by their treatment,according to symptom relief and improvement of quality of life in the course of therapy.The relationship between treatment and course,symptoms, esophageal motility,24-h pH monitoring and endoscopic findings were analysed.Results (1)5 Patients showed no response to acid suppression therapy and were excluded.For the 151 patients,92 were in on-demand therapy group,and 59 were in continuous therapy group.(2)The disease course and symptoms score in on-demand therapy group were significantly longer and higher than those of continuous therapy group (P

Objective To observe anti-sense phosphorothioate oligonucletide (ASPSODN) targeted directly to hTERT mRNA to its inhibiting effect on aimed gene and the influence on the telomerase activity, cellular proliferation, cell apoptosis of K562 cells. Methods Human leukemia cell line K562 was transfected with anti-sense oligonucleotide ASPSODN by liposome. The proliferation activity of K562 cell line was determined by using methyl thiazolyl tetrazolium assay, and telomerase activity was detected by TRAP-PCR-ELISA. Flow cytometry was adopted to examine apoptotic rate and cell cycle. RT-PCR was used to detect the expression of target gene hTERT mRNA. Results 0.6 μmol/L ASPSODN (0.42 ±0.16) was remarkably decreased the expression of hTERT mRNA, Telomerase relative activation was decreased by 52 %. According to 0.6 (μmol/L ASPSODN caused significant the inhibition of K562 cell growth. Apoptotic rate and cell cycle was examined by 0.6 μmol/L ASPSODN with flow cytometry. The cell apoptosis rate of 0.6μmol/L ASPSODN were 10.31 %. It showed the cells treated with 0.6 uU PSASODN arrested in G_1/C_0. The ratio of cells in G_2/M and S period was reduced. But there was no characteristic apoptosis peak. Conclusion ASPSODN targeted hTERT can inhibit the expression of target gene hTERT mRNA, and decrease the telomerase activity of K562 cells. ASPSODN can inhibit strongly the proliferation of K562 cell and induce cell apoptosis by decreasing telomerase activity.

Objective To discuss basis and operative indications for anterior reversional indication after failures of posterior pedicel screw instrumentation for thorcolumbar burst fracture combined with paraplegia.Methods Clinical data of 21 cases who had failures of posterior pedical screw fixation because of thorcolumbar burst fracture combined with paraplegia were analyzed retrospectively from February 1999 to April 2005.All cases were operated by removing posterior screw device.Meanwhile,one stage anterior cord decompression,correction of kyphosis,fusion with self-ilium or Titanium cage with granule fractured vertebrate and internal fixation was carried out according to clinical symptom and image findings.Spinal cord function and correction of kyphosis were evaluated by Frankel score and Cob angle.Results All cases were operated successfully.After operation,there was rib nerve injury occurred in two cases,leakage of CSF in three and refractory thigh pain in two.The follow up ranging from three months to six years(average 2.2 years) showed good interfixation except for one case had breakage of screw four months after operation.Cob angle of kyphosis recovered from preoperative 16.4? to 5.2??0.3? at follow up.Of all,16 cases had partly recovery of spinal cord function according to Frankel score.(Conclusion)As for thoracolumbar burst fracture combined with paraplegia,anterior approach can attain direct decompression,satisfactory correction of kyphosis and stable fixation and is suitable for most cases.

Objective To select an efficient method to inhibit telomerase activity, antisenseoligodeoxynucleotide and plasmid-vector mediated RNAi against hTERT were used to inhibit telomerase activity. The inhibiting effects of the two methods were compared. Methods Against hTERT mRNA, siRNA and oligodeoxynucleotide were designed and transfected into K562 cells by liposome. Effective and specific siRNA strands were selected and then plasmid was constructed and transfected into K562 cells; followed by analysis of the results. Results hTERT mRNA were detected after the three chemo-synthesized strands were transfected. It was found that si-hTERT-1 and si-hTERT-2 were effective, but si-hTERT-3 had no effect. The inhibiting effect of hTERT mRNA lasted only 48 h and disappeared at 72 h. Two siRNA strands were sieved and plasmids were constructed and transfected into K562 cells. In the P-1 group, hTERT mRNA was 0.39±0.13 at 48 h, 0.57±0.32 at 72 h. In the P-2 group, hTERTmRNA was 0.55±0.20 at 48 h, 0.88±0.23 at 72 h.In the P-1 group, the relative telomerase activity was 0.42±0.07 at 48 h, 0.31±0.08 at 72 h. In the P-2 group was 0.49±0.27 at 48 h, 0.39±0.03 at 72 h. The best concentration of siRNA was 100 μmol/L. The best concentration of ASODN was 0.6 μ mol/L. hTERTmRNA was 0.42±0.16 at 24 h, 0.71±0.18 at 48 h. Relative telomerase activity was 0.52±0.002 at 24 h, 0.482±0.018 at 48 h. Conclusion Both ASODN and RNAi targeting hTERT can inhibit the expression of hTERT mRNA, and then inhibit telomerase activity. The inhibiting effect is closely relative to the targeting site. The inhibiting effect of RNAi is better than that of ASODN. RNAi has better efficiency and lasts for a longer time. Plasmid mediated RNAi has better inhibiting effect than the chemo-synthesized siRNA.

In view of the problems of more artificial interventions and segmentation defects in existing two-dimensional segmentation methods and abnormal liver segmentation errors in three-dimensional segmentation methods, this paper presents a semi-automatic liver organ segmentation method based on the image sequence context. The method takes advantage of the existing similarity between the image sequence contexts of the prior knowledge of liver organs, and combines region growing and level set method to carry out semi-automatic segmentation of livers, along with the aid of a small amount of manual intervention to deal with liver mutation situations. The experiment results showed that the liver segmentation algorithm presented in this paper had a high precision, and a good segmentation effect on livers which have greater variability, and can meet clinical application demands quite well.
Algorithms ; Humans ; Image Interpretation, Computer-Assisted ; Imaging, Three-Dimensional ; Liver ; anatomy & histology