0.05 ) in baseline study. The atrial pressure in AF group had higher increase than no AF group. (3) there was greater AERP dispersion in patients with PAF than that in those without PAF during baseline study and PSVT (P

Objective To introduce the operation method and curative effect of posterior dislocation and acetabular posterior column ( wall) fracture with greater trochanteric osteotomy via Kocher-Langenbeck approach. Methods 14 cases of posterior dislocation and ace-tabular posterior column( wall) fracture who were treated by greater trochanteric osteotomy via Kocher-Langenbeck approach were collected, and the surgical methods, intraoperative situation and postoperative recovery were analyzed. Results The mean operating time is 105 min and the mean bleeding volum is 600 mL. After operation, there were 5 cases of anatomical reduction;8 cases of good reduction;1 cases of unsatisfactory reduction. Among the patients, 7 cases were of excellent clinical effect;4 cases were of good clinical effect, 3 cases were of medium clinical effect. Heterotopic ossification occurred in 3 cases and traumatic arthritis occurred in 4 case. Both acetabular posterior col-umn ( wall) and trochanter osteotomy ends were healed, and there was no iatrogenic sciatic nerve and femoral head necrosis injury. Conclu-sion In treatment of posterior dislocation and acetabular posterior column ( wall) fracture, greater trochanteric osteotomy via Kocher-Lange-nbeck approach can provide excellent exposure, and it is conducive to the reduction and fixation of fracture and dislocation.

Objective:To evaluate the efficacy of artificial liver blood purification system in the treatment of severe and critical patients with corona virus disease 2019(COVID-19), and to observe the dynamic changes of lymphocyte subsets and cytokines after treatment.Methods:A total of six patients with COVID-19 admitted to the ward of public health center of Henan Provincial People′s Hospital from January 31 to February 18, 2020 were enrolled, including three severe cases and three critical cases. The protocals of artificial liver treatment were developed according to the patients′ conditions, and the patients′ epidemiological history, clinical characteristics, and laboratory examination data were retrospectively analyzed. At the same time, dynamic changes of lymphocyte subsets and cytokines were detected before and after artificial liver treatment.Results:By February 24, 2020, two severe patients were discharged after cured, and one case was discharged after improved, with an average stay of 19 days. Two critical patients were still hospitalized and one died. Three severe patients were all treated with hemofiltration, while two critical patients were treated with hemofiltration plus plasma exchange, and one was treated with continuous bedside hemofiltration.Among six patients, the ratio of neutrophils to lymphocytes before treatment were 6.42, 2.63, 15.00, 15.09, 12.04 and 30.41, respectively. After treatment, the ratio of neutrophils to lymphocytes became 4.77, 6.05, 4.86, 5.43, 32.77 and 23.46, respectively.The absolute numbers of lymphocytes in six patients before treatment were low, with a median of 382/μL. After treatment of artificial liver, the absolute numbers of lymphocytes increased, with a median of 476/μL. Cytokines were detected in three critical patients, and the interleukin 6 (IL-6) levels in two cases were 26 042.00 ng/L and 282.03 ng/L, respectively before treatment. After treatment, the levels decreased to 226.85 ng/L and 26.15 ng/L, respectively. IL-6 continued increasing from 30.14 ng/L to 709.25 ng/L in one another critical patient, who eventually died.Conclusions:In severe and critical patients with COVID-19, artificial liver treatment can reduce inflammation and increase the absolute numbers of lymphocytes and the subsets. The IL-6 level may be correlated with disease progression and may be a useful prognostic factor for early identification of severe and critical COVID-19.

Objective To design a kind of nasal feeding nutritional tube that can carry 125I particles,to use this tube for the treatment of upper digestive tract malignant occlusive disease in order to achieve double effect of nasal feeding nutrition and brachytherapy.Methods 125I particles were put into a 3F catheter,then both ends of the catheter were sealed off to make 125I particle chain.By using binding technology,the 125I particle chain was fixed on the nasal feeding tube.Under DSA guidance,the nasal feeding tube carrying 125I particle chain was inserted into the esophagus,with the 125I particle chain segment crossing over the section of esophageal stenosis or occlusion to conduct brachytherapy.This technique was employed in 6 patients with advanced esophageal carcinoma.The technical success rate,operation time and complications were recorded.Two months after the treatment,the Karnofsky score,visual analogue scale (VAS) pain score,Neuhaus dysphagia grading,esophagus patency on esophageal radiography,and local tumor control rate were determined.Results The preparation of nasal feeding nutritional tube carrying 125I particle chain was simple.The technical success rate was 100％,the mean operation time was 15.5 min,no serious complications such as bleeding or infection occurred.Two months after the treatment,the Karnofsky score,VAS pain score and Neuhaus dysphagia grading were significantly improved when compared with the preoperative data (P＜0.O1).On esophageal radiography,the contrast agent passed through the narrow area smoothly.Partial remission (PR) of local tumor was obtained in all patients,and the local tumor control rate was 100％.The patients were followed up for 2-6 months,one patient developed recurrent obstruction.Conclusion It is simple and easy to prepare a nasal feeding nutritional tube carrying 125I particle chain,the use of this kind of tube can achieve both parenteral nutrition and brachytherapy at the same time.Therefore,this technique opens a new way for the treatment of esophageal malignant tumor.

Objective:To explore the influence of frequency of machinery heating power cleaning on dental handpiece loss and cleaning effect.Methods:This study selected 180 completely new high speed dental handpiece with machinery heating power cleaning. All of handpiece were randomly divided into group A, B and C, 60 cases in each group. Cleaning, oiling by special oiling machine, packing and sterilizing were carried out for the dental handpiece after being used. Group A, B and C implemented the process including machinery heating power cleaning, cleaning and oiling by special oiling machine, packing as well as sterilizing weekly, every other week and every three weeks respectively. This study randomly extracted 5 cases in each group to check the visible stains and monitor the cleaning effects after 3, 6 and 9 months.Results:Among group A, B and C, the using times were (56.60±24.77) , (49.70±30.08) , and (46.73±35.16) respectively with no statistical difference ( P=0.800) . There were 15 dental handpiece with trouble in 9 months, 4 in group A, 7 in group B and 4 in group C with no statistical difference ( P=0.660) ; 12 of them could be continued use after simple repair, 1 in group A, 7 in group B and 4 in group C with no statistical differences ( P=0.100) ; 3 of them could be continued use after changing central spindle, all in group A. The pass rates of visible cleanliness were all 100%. Conclusions:On the basis of cleaning and oiling by special oiling machine, machinery heating power cleaning every three weeks for dental handpiece can ensure the internal cleaning and improve working efficiency, but will not increase the loss.