BACKGROUND:Intervertebral disc degeneration is an important cause of low back pain.At present,there are many modeling methods for disc degeneration in China and abroad,but there is not a model for low back pain due to disc degeneration. OBJECTIVE:To compare the effect of mechanical puncture combined with tumor necrosis factor α and complete Freund's adjuvant with a conventional disc mechanical puncture alone. METHODS:A total of 18 male adult Sprague-Dawley rats were randomly divided into 3 groups,with 6 animals in each group.No treatment was given in the blank group.Animal models of intervertebral disc degeneration were made in the L4-5 segments of rats in the control using conventional mechanical puncture.In the experimental group,on the basis of mechanical puncture,tumor necrosis factor α+complete Freund's adjuvant was injected into the L4-5 intervertebral discs using a microinjector to establish a model of disc degeneration induced by mechanical puncture combined with inflammatory factors.Four weeks after surgery,the pain threshold of rats was measured by the hot plate method for assessing the perception of heat injury in rats with intervertebral disc degeneration.MRI examination was performed to observe the disc degeneration in each group.ELISA was used to detect the levels of serum tumor necrosis factor α,interleukin 1β,interleukin 6 and prostaglandin E2.Hematoxylin-eosin and Safranin O-fast green staining were used to observe the morphological changes of the disc. RESULTS AND CONCLUSION:In terms of pain,the behavioral pain threshold of the experimental group was continuously decreased,and the levels of serum inflammatory factors were significantly higher compared with the control group.In terms of morphology,the MRI results showed that the L4-5 nucleus pulposus signal completely disappeared in the experimental group.Histopathological results showed that in the control group,the nucleus pulposus was intact,more notochord cells were visible,and some fiber rings were ruptured,while in the experimental group,there are fewer notochord cells and the structure of the nucleus pulposus and fibrous ring is disturbed,with the boundary disappearing.To conclude,mechanical puncture combined with tumor necrosis factor alpha and complete Freund's adjuvant can successfully establish a discogenic low back pain model in rats.This operation is simple and economical to achieve obvious disc degeneration and low back pain,with greatly shortened molding cycle.This model can be used as a reference for studying discogenic low back pain models.

Objective:To retrospectively analyze the surgical treatment of isolated pulmonary mucormycosis, explore the timing and effect of operation.Methods:Clinical data of patients with isolated pulmonary mucormycosis who underwent surgical treatment from April 2019 to April 2024 were collected and retrospectively analyzed, combined with literature review.Results:The clinical data of 13 patients with pulmonary mucormycosis who underwent operation were collected, including 9 males and 4 females, aged 22~64(45.4±15.4)years old. The basic diseases included diabetes mellitus in 10 cases and hematological malignancy in 3 cases. Seven patients had hemoptysis during the course of the disease. All 13 patients received adequate antifungal therapy before surgery, and 12 patients received bronchoscopic interventional therapy. Ten patients underwent lobectomy, two underwent pneumonectomy, and one underwent a right sleeve pneumonectomy. All patients were cured except one patient with bronchopleural fistula after operation. All patients achieved complete elimination of mucor and also discontinuation of antifungal drug.Conclusion:For isolated pulmonary mucormycosis, on the basis of systemic antifungal treatment, actively seek the opportunity of surgical intervention, can shorten the course of the disease and achieve good therapeutic results.

Objective:Immune checkpoint inhibitors have a high remission rate in the preoperative application of resectable and potentially resectable non-small cell lung cancer when combined with chemotherapy. For the unresectable stage Ⅲ non-small cell lung cancer, whether the transformation can be achieved through this regimen to provide opportunities for surgical resection is controversial. In this study, we evaluated the pattern of transformation therapy by reviewing the efficacy and safety of preoperative therapy and surgery of this group.Methods:A review of 23 patients undergoing surgical resection after transformation therapy by preoperative immunotherapy combined chemotherapy between November 2019 and November 2021 was performed. All patients must clarify the pathological diagnosis of non-small cell lung cancer by biopsy. After the multi-disciplinary treatment team and preoperative imaging assessment, the diagnosis should be consistent with unresectable stage III as described in the Expert Consensus on Multidisciplinary Management of Stage Ⅲ Non-Small Cell Lung Cancer, 2019 Edition. After 2 to 4 cycles of preoperative anti-PD-1 monoclonal antibody combined with chemotherapy, the surgical team assessed the chance of resection and performed surgery. Important indicators such as surgical resection rate, R0 resection rate, MPR, pCR, incidence of grade 3-5 adverse reactions and various other perioperative data were counted.Results:In the whole group, initial imaging evaluation was 10 of stage cⅢA and 13 of stage cⅢB.15 cases had multiple stations N2 lymph nodes metastasis, 9 had enlarged fused N2 lymph nodes metastasis, 6 had large vessel invasion(T4), and 1 had contralateral mediastinal lymph node metastasis(N3). After preoperative neoadjuvant therapy, 17 cases achieved PR, 3 achieved SD and 3 achieved PD. The surgical resection rate of the whole group was 91.3%(21/23, 1 lobectomy combined with superior vena cava reconstruction, 2 sleeve lobectomy, 5 pneumonectomy, 12 lobectomy/combined lobectomy, 1 wedge resection and 2 unresectable cases), R0 resection rate was 95.2%(20/21). MPR was achieved in 13 cases, 8 of them reached pCR. There were no perioperative deaths, median surgical time was 260(190-460) min, median bleeding volume was 100(50-750) ml, median drainage time was 5(3-9) days, and median hospitalization was 7(5-11) days. Two cases got immunotherapy-related grade 3 adverse reactions, one was interstitial pneumonia and the other was immune-related injury involving the eye, oral and genital mucosa. Two cases got surgical complications and one was persistent lung leakage, which stopped after 46 days of conservative treatment; The other was pleural effusion, which was relieved after drainage.Conclusion:For the unresectable stage Ⅲ NSCLC, immunotherapy combined chemotherapy is an effective preoperative downstage method. It can convert 91.3% cases to resectable ones while achieving a good degree of pathological remission. Its side reactions are generally controllable and safety.

Objective:To systematically review the efficacy and safety of new oral anticoagulants(NOACs)for the treatment of patients over 70 years with atrial fibrillation.Methods:Studies comparing NOACs(dabigatran, rivaroxaban, apixaban, ximelagatran and edoxaban)versus warfarin for the treatment of patients over 70 years with atrial fibrillation were searched through databases including PubMed, Embase and the Cochrane Library, from the earliest electronic records to those published in March 2021.Stata15.0 software was used for meta-analysis.Results:A total of 19 studies and 215 471 patients were included.Meta-analysis results showed that, compared with warfarin, either a low-dose(110 mg)or a standard-dose(150 mg)of dabigatran reduced the risk of stroke/systemic embolism(SSE)in patients over 70 years with atrial fibrillation.A standard-dose of dabigatran did not decrease the risk of major bleeding, but a low dose was able to achieve it.A standard-dose(20 mg)of rivaroxaban could considerably reduce the risk of SSE in geriatric patients over 70 years with atrial fibrillation without increasing the risk of major bleeding.A standard-dose(5 mg)of apixaban could considerably decrease the risk of SSE and major bleeding in patients over 70 years with atrial fibrillation; A standard-dose(36 mg)of ximelagatran was as effective as warfarin in decreasing the incidence of SSE in patients over 70 years with atrial fibrillation, but could also considerably decrease the risk of major bleeding; A low-dose(15-30 mg)or a standard-dose(30-60 mg)of edoxaban decreased the incidence of SSE in patients over 70 years with atrial fibrillation, as did warfarin, but edoxaban considerably decreased the risk of major bleeding.Conclusions:Compared with warfarin, most of new oral anticoagulants show good efficacy in patients over 70 years old with atrial fibrillation, NOACs given at standard doses increase the risk of major bleeding, but at low doses can realize both efficacy and safety.

Objective:To investigate the relationship between sarcopenia and early renal dysfunction in elderly patients with type 2 diabetes mellitus(T2DM).Methods:A total of 198 elderly patients with T2DM aged over 60 years undergoing treatment in the Geriatric Department of Beijing Hospital from July 2018 to July 2019 were enrolled in this retrospective case-control study.The estimated glomerular filtration rate(eGFR)is calculated according to the CKD-EPI Cr-Cys formula.Based on the eGFR, the patients were divided into normal renal function group(n=63, in CKD 1 stage)and mild renal dysfunction group(n=135, in CKD 2-3a stage). All subjects underwent physical examination, laboratory examination and dual energy X-ray bone density examination. Results:The age, weight, body mass index, abdominal circumference, serum creatinine, cystatin C, uric acid, diastolic pressure, the proportions of diabetes and hypertension were lower, and the high-density lipoprotein cholesterol, appendicular skeletal muscle mass(ASM)and skeletal muscle mass index(SMI)were higher, in the normal renal function group than in the mild renal dysfunction group( P<0.05 or 0.01). Spearman correlation analysis showed that eGFR was positively correlated with SMI( r=0.343, P<0.01). Logistic regression analysis showed that body weight( OR=1.318, 95% CI: 1.091-1.594), uric acid( OR=1.007, 95% CI: 1.001-1.012), diastolic blood pressure( OR=1.072, 95% CI: 1.033-1.112), years of diabetes( OR=1.075, 95% CI: 1.013-1.142)were risk factors, and the LSM( OR=0.136, 95% CI: 0.047-0.392)and SMI( OR=0.778, 95% CI: 0.703-0.860)were protective factors for the early renal dysfunction in elderly patients with T2DM. Conclusions:Elderly patients with T2DM are often co-existed with sarcopenia.Sarcopenia is associated with early renal dysfunction in elderly patients with T2DM.

With the acceleration of the aging process in China, the incidence rates of coronary heart disease and cerebral infarction have significantly increased.And iodine contrast agent is often used in imaging diagnosis and percutaneous intervention therapy.The contrast medium is filtered from the glomerulus in its original form and is not absorbed by renal tubules.However, the accumulation of iodine contrast medium in the kidney can lead to acute kidney injury.Kidney is one of the most important excretory and endocrine organs in human body.The prevention and treatment of contrast-induced nephropathy(CIN)have been widely concerned.The incidence rate of contrast-induced renal damage is higher and the prognosis is poorer in the elderly than in the non-elderly due to the decline of organ function in the elderly.At present, the mechanism of action for oxygen free radicals in CIN of the elderly is still unclear.This article reviews the researches on the role of oxygen free radical in CIN of the elderly studied by domestic and foreign scholars in recent years.

Objective: To introduce our experience of 4L lymph node dissection in left lung cancer and to analyze the pattern of 4L LN metastasis. To investigate the prognostic impact of 4L lymph node dissection. Methods: 171 patients with left lung cancer who underwent pulmonary resection andsystematic mediastinal lymph node dissection from March 2016 to March 2019 were collected retrospectively. There were 106 males and 65 females endolled, aged(64.1±7.7) years. 54.4% had a history of smoking. The diameter of the tumors was(3.3±1.9) cm; Central-type tumor were 59 cases(34.5%), peripheral 112 cases(65.5%), upper lobe 95 cases(55.6%) and lower lobe 76 cases(44.4%). The clinical and perioperative data as well as the pattern of lymph node metastasis were analyzed. t test or Mann-Whiteney U test was used for continuous variables, and χ² test or Fisher test was used for categorical variables. Multivariate analysis was performed using a logistic regression model to evaluate the risk factors. Results: The metastasis rate of station 4L was 21.6%. Tumor size, locations(central type/upper lobe), operative type, micropapillary/entity components and vascular invasion were risk factors for 4L LN metastasis in univariate analysis. Tumor size(OR=1.611, P=0.032) and location of upper lobe(OR=2.823, P=0.008) were independent risk factors in multivariate logistic analysis. Through the analysis of ROC curve, the optimal cutoff point of tumor size was 2.5cm. The metastatic rate of 4L was 32.6% when tumor size larger than 2.5 cm and 7.9% when tumor size smaller than 2.5cm.Tumor located in upper lobe tended to metastasize to upper mediastinal lymph nodes, including station 4L, 5 and 6, while the one located in lower lobe tended to metastasize to station 7. Conclusion Station 4L LN involvement is commen in left lung cancer. The dissection of the 4L LN is important, especially for the tumor larger than 2.5 cm or located at upper lobe.

Objective To investigate the safety and feasibility of thoracoscopic lobectomy without mechanical suture. Methods The data of 28 consecutive patients (a non-mechanical suture group, 16 males and 12 females at age of 61.23±11.10 years) who underwent non-mechanical suture anatomic thoracoscopic lobectomy performed by the same surgeon from March 2015 to March 2018 were analyzed retrospectively, and 28 patients (18 males and 10 females at age of 59.45±13.39 years) who underwent completely anatomic thoracoscopic lobectomy with endoscopic stapler (a mechanical suture group) in the same period were matched. The clinical effectiveness of the two groups was compared. Results The operation time between the non-mechanical suture group (136.30±53.46 min) and the mechanical suture group (109.63±44.61 min) showed a statistical difference (P<0.05). While in term of intraoperative bleeding volume (65.00 mlvs. 50.00 ml), postoperative thoracic drainage time (3.73 days vs. 3.56 days), thoracic drainage volume (538.60 ml vs. 563.70 ml), postoperative hospital stay (5.58 days vs. 5.35 days) and postoperative complication rate (5/28 vs. 6/28), there was no statistical difference between the two groups. Hospitalization expense was significantly different between the two groups (35 438.30 yuan vs. 51 693.60 yuan). Conclusion Non-mechanical suture thoracoscopic anatomic lobectomy is safe and feasible, and can significantly reduce the medical cost but prolong the operation time.

Objective To evaluate the effect of recurrent laryngeal nerve detector on the operation of upper or middle-thoracic esophageal carcinoma. Methods A total of 60 patients with resectable esophageal carcinoma in Beijing Tsinghua Changgung Hospital from January 2015 to December 2017 were recruited. These patients were randomly divided into experimental group and control group by using random number table method.The experimental group used recurrent laryngeal nerve detector to assist in the nerve exploration and separation. The control group was treated by routine operation method, and the operation effect of the two groups was compared. Results In the experimental group, the time spent on the confirmation of recurrent laryngeal nerve was significantly shorter than that in the control group [right side: 1.50 min (1.00, 1.63 min) vs. 5.50 min(4.88, 6.50 min), Z= -6.715, P < 0.05; left side: 1.75 min (1.50, 2.00 min) vs. 7.85 min (6.50, 9.00 min), Z= -6.726, P< 0.05]. The rate of recurrent laryngeal nerve injury in the experimental group was significantly lower than that in the control group [3.3 % (1/30) vs. 20.0 % (6/30), χ 2= 4.043, P < 0.05]. Conclusion The use of recurrent laryngeal nerve detector in the neck anastomosis of upper or middle-thoracic esophageal carcinoma can significantly shorten the time spent on confirming of the recurrent laryngeal nerve and reduce the rate of recurrent laryngeal nerve injury.

Objective Lung cancer has been the most common cause of cancer death worldwide.More than three quarters is diagnosed at advanced stage.Nearly one half has distant metastases outside the chest cavity.It has been recognized that oligometastatic state exists in natural history of malignant tumors,which has significantly better prognosis than those with polymetastases.The eighth edition of TNM staging system defined NSCLC with a single metastasis as a new separated stage(M1 b).Long-term survival of oligometastatic NSCLC patients treated with local control methods has been reported in literatures.But whether surgical resection of liver metastasis has benefit or not remains unknown.We performed a systematic review of surgical therapy for NSCLC with limited liver metastases.