Objective To introduce a locating device for the entry point of intramedullary nail based on the inertial navigation technology,which utilizes multi-dimensional angle information to assist in rapid and accurate positioning of the ideal direction of femoral anterograde intramedullary nails'entry point,and to verify its clinical value through clinical tests.Methods After matching the locating module with the developing board,which are the two components of the locating device,they were placed on the skin surface of the proximal femur of the affected side.Anteroposterior fluoroscopy was performed.The developing angle corresponding to the ideal direction of entry point was selected based on the X-ray image,and then the yaw angle of the locating module was reset to zero.After resetting,the locating module was combined with the surgical instrument to guide the insertion angle of the guide wire.The ideal direction of entry point was accurately located based on the angle guidance.By setting up an experimental group and a control group for clinical surgical operations,the number of guide wire insertion times,surgical time,fluoroscopy frequency,and intraoperative blood loss with or without the locating device was recorded.Results Compared to the control group,the experimental group showed significant improvement in the number of guide wire insertion times,surgical time,fluoroscopy frequency,and intraoperative blood loss,with a statistically significant difference(P<0.01).Conclusion The locating device can assist doctors in quickly locating the entry point of intramedullary nail,effectively reducing the fluoroscopy frequency and surgical time by improving the success rate of the guide wire insertion with one shot,improving surgical efficiency,and possessing certain clinical value.

Objective To analyze the influence of shaping on the bending strength of bone plates and the influence of different locking nail distributions on plate force to provide biomechanical references for shaping plates and selecting different locking nail distributions.Methods Finite element simulation analysis of the four-point bending strength of a plate was performed according to the YY/T 0342-2020 standard.Theoretical analysis and finite element simulation method were used to analyze the force on prosthesis models with different lock-nail distributions.Results At 30° bending,the 3.7 mm-thick plate had 28%higher equivalent plastic strain than the 2.7 mm-thick plate.The 3.7 and 2.7 mm-thick plates had ultimate bending angles of 55° and 67°,respectively.The crease had little impact on the plate stress.The four-point bending strength and equivalent bending stiffness of the unshapeed structure were 2.64 N·m and 1.12 N·m2,respectively.The four-point bending strength and equivalent bending stiffness with the crease were 2.63 N·m and 1.10 N·m2,respectively.After forward and backward bending,the four-point bending strength of the plate decreased from 2.64 to 2.45 N·m by approximately 7.72%,and the equivalent bending stiffness decreased from 1.12 to 0.98 N·m2 by approximately 12%.The impact was obvious.After implantation of tamponade screws,the four-point bending strength of the single-hole plate improved significantly from 2.64 to 3.15 N·m,by approximately 19.32%and the equivalent bending stiffness increased from 1.12 to 1.14 N·m2,by approximately 2.1%.At least two locking holes were reserved on both sides of the fracture line.Not inserting the locking screw reduced the stress by approximately 50%compared with the full insertion of the locking screw.During 15-week postoperative walking without bone callus formation,the material stress of TC4 reached 852.7 MPa and yielding occurred.Conclusions In a clinical scenario where larger shaping is required,it is not suitable for plates with larger thicknesses and plate fractures are more likely to occur after large-thickness shaping.This can guide the clinical selection of plates with appropriate thickness based on the shaping angle,and tamponade screws can be implanted in extreme cases.Fixing locking screws clinically is recommended;however,a method of fixing the locking screws with full screws is not recommended.The biomechanical effect is best when two locking holes at both ends of the fracture line are maintained without fixing the locking screws.

Organ transplantation has emerged as a therapeutic modality for children with end-stage organ failure. With advancements in surgical techniques, organ preservation methods, and immunosuppressive therapies, both the success rate of transplantation and the long-term quality of life of recipients have continued to improve. Initially applied primarily in cardiothoracic transplantation, extracorporeal membrane oxygenation (ECMO) has gradually expanded its role in pediatric organ transplant recipients to include perioperative support for cardiopulmonary complications in abdominal organ transplants such as liver and kidney, as well as in the maintenance of deceased donors. With ongoing refinements in ECMO technology and equipment, its significance in supporting children with end-stage organ failure has become increasingly prominent, offering renewed hope and survival for a growing number of pediatric patients with organ failure.

The current organ allocation rules prioritize elderly and urgent patients on the lung transplantation (LT) waiting list. A steady increase in the threshold at which age is taken into consideration for LT has been observed. This retrospective cohort study recruited 166 lung transplant recipients aged ≽ 65 years between January 2016 and October 2020 in the largest LT center in China. In the cohort, subgroups of patients aged 65-70 years (111 recipients, group 65-70) and ≽ 70 years (55 recipients, group ≽ 70) were included. Group D restrictive lung disease was the main indication of a lung transplant in recipients over 65 years. A significantly higher percentage of coronary artery stenosis was observed in the group ≽ 70 (30.9% vs. 14.4% in group 65-70, P = 0.014). ECMO bridging to LT was performed in 5.4% (group 65-70) and 7.3% (group ≽ 70) of patients. Kaplan-Meier estimates showed that recipients with cardiac abnormalities had a significantly increased risk of mortality. After adjusting for potential confounders, cardiac abnormality was shown to be independently associated with the increased risk of post-LT mortality (HR 6.37, P = 0.0060). Our result showed that LT can be performed in candidates with an advanced age and can provide life-extending benefits.
Aged ; Humans ; East Asian People ; Heart Diseases/etiology* ; Lung Transplantation/adverse effects* ; Retrospective Studies

As the aging proceeds worldwide, aging lung transplantation recipients have been increased dramatically. Aging population with end-stage lung diseases also have comorbidities, such as cardiovascular disease, which may impact the prognosis of lung transplantation. Recent researches on lung transplantation have explored the characteristics of aging recipients, strategy selection on transplantation and cardiovascular disease management, as well as risk factors for post-transplantation complications and death. However, researches on lung transplantation recipients with cardiac valve disease are just in the initial stage. With the advancement of transcatheter technique, more patients will be benefited. We summarized the advancement in this field and took an outlook for future clinical researches.

During the novel coronavirus pneumonia (COVID-19) pandemic from 2020 to 2021, lung transplantation entered a new stage of development worldwide. Globally, more than 70 000 cases of lung transplantation have been reported to the International Society for Heart and Lung Transplantation (ISHLT). With the development of medical techniques over time, the characteristics of lung transplant donors and recipients and the indications of pediatric lung transplantation recipients have undergone significant changes. Application of lung transplantation in the treatment of COVID-19-related acute respiratory distress syndrome (ARDS) has also captivated worldwide attention. Along with persistent development of lung transplantation, it will be integrated with more novel techniques to make breakthroughs in the fields of artificial lung and xenotransplantation. In this article, research progresses on the characteristics of lung transplant donors and recipients around the world were reviewed and the development trend was predicted, enabling patients with end-stage lung disease to obtain more benefits from the development of lung transplantation technique.

Lung transplantation has been advanced for nearly half a century around the globe, and it has been developed rapidly for over 20 years in China. The field of lung transplantation in China has been gradually integrated into the international community. The outbreak of novel coronavirus pneumonia (COVID-19) in 2020 brought big challenges, as well as diverted the worldwide attention to the development of lung transplantation in China, accelerating international communication and cooperation. With the steadily deepening of clinical and basic research on lung transplantation for severe cases of COVID-19, organ transplant physicians have deepened the understanding and thinking of the maintenance of donors, selection of elderly and pediatric candidates, and perioperative management of recipients, as the future perspective of lung transplantation in China. For interdisciplinary research related to lung transplantation, it is necessary to carry out multi-center clinical trials with qualified study design and constantly promote the theoretic and practical innovation.

Objective To investigate the expression level of immunoglobulin G (IgG)4 cells in patients previously diagnosed as unexplained liver injuries,and to analyze whether these patients could be diagnosed as immunoglobulin G4-related disease (IgG4-RD).The clinical characteristics of patients with IgG4 positive cells infiltration in liver tissues who did not met IgG4-RD diagnosis criteria were also analyzed.Methods From August 2010 to July 2016,33 patients with unexplained liver injuries even after liver biopsy were enrolled.Immunostaining of IgG and IgG4 in liver tissue slices was performed.Whether the patients met the IgG4-RD diagnosis criteria was analyzed.Also,the relation between IgG4 positive cell infiltration in liver tissues and serum parameters (alanine aminotransferase (ALT),aspartate transaminase (AST),alkaline phosphatase (ALP),γ-glutamyl transpeptadase (GGT),IgG),the classification of liver inflammation and stage of liver fibrosis were analyzed.Chi-square,Fisher exact probability method,t test and Wilcoxon rank and inspection were used for statistical analysis.Results Among 33 patients with unexplained liver injuries,average age of onset of the disease was (50.48 ± 14.52) years old.Ten patients (30.3 ％) presented with different degree of IgG4 positive cells infiltration in liver.In one patient,the IgG4 positive cell number in liver tissue was over 10/high-powered field (HPF),IgG4+ / IgG+ ratio was over 40％,the serum IgG4 increased and low density nodules in the left hepatic lobe level,which met the diagnostic criteria of IgG4-RD.Serum parameters of liver function of this patient were as follows:ALT 948 U/L,AST 658 U/L,ALP 176 U/L,GGT 197 U/L,TBil 21.5 μmol/L,DBil 10.0 μmol/L.According to whether there were IgG4 positive cells infiltration in liver tissues,33 patients were divided into IgG4 positive cells infiltration group (IgG4 positive group,10 cases) and no IgG4 positive cells infiltration group (IgG4 negative group,23 cases).The medium levels of ALT,AST,ALP and GGT in the IgG4 positive group and the IgG4 negative group were 26.0 U/L vs 31.0 U/L,28.5 U/L vs 32.0 U/L,114.0 U/L vs 77.0 U/L,65.0 U/L vs 36.0 U/L,respectively and there were no statistically significant differences (Z=-0.098,-0.216,-0.862,-0.705;all P＞0.05).The serum IgG level of the IgG4 positive group was higher than that of the IgG4 negative group (17.15 g/L vs 13.65 g/L),and the difference was statistically significant (Z=-1.776,P =0.035).Conclusions IgG4-RD may be the reason of liver injury.There are no significant differences in clinical charateristics,serum parameters and inflammation degree in liver tissue between patients with or without IgG4 positive cells infiltration.

Objective To investigate the characteristics and treatment for pneumatosis cystoides intestinalis (PCI). Methods Data of 12 PCI patients admitted to General Hospital of Tianjin Medical University from 1997 to 2015 were analyzed. The causes, endoscopic characteristics, therapeutic effects and prognosis were evaluated. Results Four cases were primary PCI due to long?term exposure to trichloroethylene or unknown reasons, while 8 other cases were secondary to Behcet's disease, connective tissue disease, emphysema, diabetes, therioma, etc. Endoscopic findings included bubble?like, linear,cobblestone?like, graped or beaded gas cysts, involving sigmoid in 6 cases, ascending colon in 3, descending colon in 2, duodenum in 2 and rectum in 1. After combination of medicinal and endoscopic treatment, symptoms of 8 patients were relieved, and the condition of 2 patients improved, while 2 patients died of malignancy. Conclusion Pneumatosis intestinalis is a rare disease, usually secondary to other diseases, which can be diagnosed by colonoscopy and ultrasonic endoscopy. Pathogenesis of PCI is still unclear. Single PCI can be cured with endoscopic resection. Multiple PCI can be managed with cyst clipping, antibiotics and intestinal flora regulator. Treatment of the original disease and early detection of complications can improve the prognosis and reduce recurrence of PCI.