BACKGROUND:Bony and structural feature often cause pulout strength decrease of pedicle screw, which induces loosening and pulout, and finaly results in fixation failure. Thus, it is very important to elevate the stability of pedicle screw.
OBJECTIVE:To detect the biomechanical stability of bone cement injectable canulated pedicle screw, and to provide reference for bone cement dosage.
METHODS: We selected T11-L4 samples of seven fresh adult corpses, containing 40 vertebral bodies. They were randomly divided into bone cement injectable canulated pedicle screw group and DTPSTM pedicle screw group (n=20). After screw implantation, 1, 2, 3 and 5 mL bone cement was injected. The diffuse distribution of bone cement was observed by imaging. The maximum axial pulout strength was measured.
RESULTS AND CONCLUSION:When the dose of bone cement was 1-3 mL, the average maximum axial pulout strength was significantly greater in the bone cement injectable canulated pedicle screw group than in the DTPSTM pedicle screw group (P < 0.05). When the bone cement dosage was 5 mL, no significant difference in the maximum axial pulout strength was detected between the two groups (P > 0.05). The regression equation was Y=25.269X+133.681 (R2=0.837) in the bone cement injectable canulated pedicle screw, and Y=32.039X+99.251 (R2=0.936) in the DTPSTM pedicle screw group. When the dosage of bone cement was 1-5 mL, the maximum axial pulout strength was highly positively correlated with bone cement dosage (|R| > 0.8). These results suggested that bone cement augmentation pedicle screw could apparently elevate the stability of the screw. The maximum axial pulout strength of the pedicle screw was positively correlated with bone cement dosage. After reaching the satisfactory fixation effects, the bone cement injectable canulated pedicle screw can reduce bone cement dosage, diminish the risk of bone cement leakage, and have more advantages than DTPSTM pedicle screw.

Objective To study the prevention of gentamicin ototoxicity by resveratrol(Res) in guinea pigs.Methods Auditory brainstem response and cochlear preparation transmission electron microscope were used to evaluate the effects of hair cell on hearing threshold and morphology of hair cell. Serum levels of GM were also tested. It was comprised of five groups,each group had eight animals.GM and Res were tested alone and in combination,besides control group.Results GM group developed a progressive threshold shift. Injury in high frequency was significantly more severe than that in low frequency (P

Based on the high-dimension chaos characteristics of electroencephalogram(EEG) and the analysis by the multi-variable state space reconstruction,better estimation of the correlative dimension can be obtained by dividing the brain into two parts and using eight EEG channels as the reconstruction samples.Lorenz system was firstly tested by request of the amount of data to test the feasibility of the algorithms.After Comparing the high-dimension data of the EEG of epileptic patients with the results of control subjects,it is indicated that the multi-variable state space reconstruction is applicable in short time noise-containing time sequences to obtain reliable results and can free the researchers from the hard choice of delay time and embedding dimension.

Objective To review the experience of 162 cases of coronary artery bypass grafting (CABG) via a lower median ministernotomy. Methods CABG through a lower median ministernotomy was conducted in 162 cases from April 1998 to June 2003, including 77 cases of CABG under extracorporeal circulation, 13 cases of CABG concomitant with intracardiac surgery, and 72 cases of off-pump coronary artery bypass grafting (OPCABG). Results There were 1 case of surgery-related death (0.6%) and 1 case of re-operation (0.6%). Postoperative complications occurred in 9 patients (5.6%). In conventional CABGs, the aortic cross-clamp time, cardiopulmonary bypass time, and operation time were 74.8?23.1 min, 113.6?31.3 min, and 255.5?54.5 min, respectively. The operation time of OPCABG was 195.6?50.6 min. The number of anastomoses ranged 1~5 (2.4?0.7). The length of postoperative tracheal intubation was 0~364 h (median, 11 h). The length of postanesthesia care unit (PACU) stay and hospital stay were 1~28 d (median, 3 d) and 5~60 d (median, 10 d), respectively. The chest drainage volume was 607.2?443.0 ml, or 8.6?6.0 ml/kg. A blood transfusion was required in 38 cases, with a transfusion amount of 1161.3?741.2 ml. Conclusions A less invasive approach is possible in coronary artery bypass grafting via a lower median ministernotomy. This procedure provides satisfactory outcomes and good cosmetic results, during which a complete revascularization for multiple vessels and concomitant intracardiac operations are available.

Objective To review the experience of 460 cases of cardiac operations through a lower median ministernotomy. Methods A total of 460 cardiac operations via a lower median ministernotomy route were carried out between January 1997 and August 2003 in this hospital, involving 100 operations for congenital heart diseases, 178 valve operations, 168 coronary operations, 12 operations for aneurysms, and 2 other operations. On operation no special instruments were required. Results Within the hospitalization period 4 patients died (0.9%) and 3 underwent a re-operation (0.7%). Postoperative complications occurred in 29 patients (6.3%). Off-pump operations were employed in 73 patients, while in the remaining 387 patients the cardiopulmonary bypass time was 25~1 115 min (median, 80 min) and the aortic cross-clamp time was 0~164 min (55.8?31.9 min). Of the 460 patients, the length of postoperative tracheal intubation was 0~364 h (median, 10 h), and the postoperative chest drainage was 20~3 290 ml (median, 350 ml), or 0.3~42.2 ml/kg (median, 5.8 ml/kg). Blood transfusion were required after surgery in 280 patients with an amount of 951.1?644.6 ml. The postoperative ICU and hospital stay were 1~28 d (median, 2 d) and 1~60 d (11.6?6.0 d), respectively. A follow-up for 7~80 months (59.2?29.6 months) in 371 patients was conducted. No long-term deaths were noted and symptoms were significantly improved. Heart function was classified as grade Ⅰ in 169 patients, grade Ⅱ in 135 patients, and grade Ⅲ in 67 patients, respectively, with significant difference as compared with that in pre-operation ( Z =-12.57 , P =0.000). No significant difference was observed in the cardiothoracic ratio (0.50?0.11, 0.41~0.67) between postoperative and preoperative period ( t =-1.63, P =0.104). The left ventricular ejection fraction was significantly higher postoperatively (0.36~0.71, 0.606?0.113) than preoperatively ( t =3.43, P =0.001). Conclusions In properly selected cases, heart operations through a lower median ministernotomy provides many advantages including mini-invasion, high reliability, excellent cosmetic results, simplicity to performance, and good surgical outcomes.

OBJECTIVE To investigate the effect of NF-κB on cardiomyopathy induced by doxorubicin(Dox) in rats and the effect of melatonin(MT). METHODS Thirty male Sprague-Dawley rats were randomly divided into 3 groups: normal control group; Dox model group; Dox+MT group. The content of nitric oxide (NO) and the activity of inducible nitric oxide synthase (iNOS) in cardiac tissues were examined by spectrophotography method; the activity of NF-κB in myocardial cell was observed by immunohistochemistry method; the apoptosis information of myocardial cell was detected by TUNEL method. RESULTS There was significant difference in activity of NF-κB between normal control and the Dox model group. MT could inhibit the activation of NF-κB(P＜0.05). There was significant difference in the content of NO and the activity of iNOS between normal control and Dox model group, MT could decrease content of NO and the activity of iNOS(P＜0.05); apoptotic rate in Dox model group was significantly increased compared with that in normal control group, MT could significantly decrease myocardial cell apoptosis (P＜0.05). CONCLUSION The activation of NF-κB plays an important role in cardiomyopathy induced by Dox, NF-κB seems to increase the activity of iNOS, and then significantly increase the content of NO in cardiac muscle; NF-κB possibly enhances myocardial cell apoptosis in cardiomyopathy induced by Dox. MT may inhibit the activation of NF-κB, and prevent excessive oxidative stress and suppress myocardial cell apoptosis, MT has protective effect against cardiomyopathy induced by Dox.

Objective To summarize the successful experience of radiodiagnosis specialist nursing model in our hospital.Methods Retrospectively analyze the course of establishment and development of radiodiagnosis specialist nursing model in our hospital.Many aspects including setting of the nursing unit,post,quota and salary,development of post responsibilities,systems,standards and procedures,establishment of quality control and performance evaluation system,standardization of the conventional specialist technology,study and application of the new specialist technology were expounded.Results Radiodiagnosis specialist nursing model had been established and improved after five years' exploration.Quality index of care,service and safety showed a steady upward trend.Specialist new technologies had prominent features.Teaching and research achieved initial success.Conclusions Establishment of radiodiagnosis specialist nursing model makes radiology nursing connotation more comprehensive.More importantly,it is of significance in guiding the development of radiodiagnosis specialist nursing.

SELEX is a newly developed biochemical technique,which filter out high specificity and high affinity ligand for the target molecules through the identification of aptamer combined with the target molecules.The specific aptamer was used in a variety of clinical applications,such as diagnosis of the disease,development of new therapeutic drugs and even directly applied to disease treatment.

OBJECTIVE: By analysing the video-nystagmography findings of positional tests,to evaluate the therapeutic effect of the patients with horikontal semicircular canal cupulolithiasis (HSC-Cup). METHOD: A retrospective study of 36 patients with HSC-Cup. The induced nystagmus in roll tests was recorded by videonystagmography, whose direction, latency, intensity and time characteristics were analysed. All of the 36 patients were treated with lying position avoiding normal side and oral-taken betahistine mesilate tablets. A week later return visits and curative effects evaluation were made. RESULT: Horizontal apogeotropic nystagmus was induced by turning left or right in HSC-Cup roll tests. The time of latency and duration turning to normal and lesion side were(0. 93 ± 0. 65)s and(1. 01 ± 0. 78)s, (100.58 ± 36. 56)s and (118. 65 ± 143. 71)s, which showed no statistically significant difference (P>0. 05). The duration of nystagmus was more than 60 seconds. The intensity of nystagmus turning to normal and lesion side were(45.58 ± 28.71)°/s and (20.42 ± 16. 64)°/s. The intensity turning to normal side was greater than lesion side obviously. The difference was statistically significant (P<0. 05). Twenty-three patients withright HSC-Cup, and 13 patients with left HSC-Cup were taken in count. They were treated with above methods and return visit a week later. Twenty-eight patients (77. 77%) were cured, 36 patients (100. 00%) were improved. There were 4 patients recurrence during the follow-up. CONCLUSION The direction and duration time of induced nystagmus are available to diagnose the HSC-Cup. The lesion side may determined according to the intensity of induced nystagmus. Lying position avoiding normal side and oral-taken betahistine mesilate tablets is an effective treatment methods for HSC-Cup.
Benign Paroxysmal Positional Vertigo ; complications ; diagnosis ; Face ; Humans ; Nystagmus, Physiologic ; Retrospective Studies ; Semicircular Canals ; Treatment Outcome ; Vertigo

A total of 26 male patients with urethral condyloma acuminatum took Polystictus glycopeptide capsules orally for 4 weeks plus 1-5 sessions of photodynamic therapy.Prior to the first session,human papilloma virus (HPV) genotype of wart tissue was detected.Verrucous body fell off completely.The follow-up period was 6 months.There was one recurrent case.And 24 cases had HPV genotype DNA.The positive rate of high-risk infection was 46.2％ ; the high/low-risk mixed type cross infection was present.The multiple HPV6 low-risk infection rate was 23.1％ and multiple high-risk infection rate 58.3％ ; highrisk type HPV16,HPV31,HPV58 and HPV6,HPV11 were all of mixed types.