Objective:To investigate the risk factors of bronchopulmonary dysplasia (BPD) in very low birth weight (VLBW) infants with gestational age ≤32 weeks within 28 days after birth and to establish and validate the nomogram model for BPD prediction.Methods:We retrospectively chose VLBW infants with gestational age ≤32 weeks who survived to postmenstrual age (PMA) 36 weeks and were admitted to the neonatal intensive care unit of Peking University Third Hospital from January 2016 to April 2020 as the training cohort. BPD was diagnosed in accordance with the 2018 criteria. The clinical data of these infants were collected, and the risk factors of BPD were analyzed by Chi-square test, Mann-Whitney U test, and multivariate logistic regression, and a nomogram model was established. The area under the curve (AUC) of the receiver operating characteristic (ROC) curve was used to assess the predictive performance. Decision curve analysis (DCA) was constructed for differentiation evaluation, and the calibration chart and Hosmer-Lemeshow goodness of fit test were used for the calibration evaluation. Bootstrap was used for internal validation. VLBW infants with gestational age ≤32 weeks survived to PMA 36 weeks and admitted to Hebei Chengde Maternal and Child Health Hospital from October 2017 to February 2022 were included as the validation cohort. ROC curve and calibration plot were conducted in the validation cohort for external validation. Results:Of the 467 premature infants included in the training cohort, 104 were in the BPD group; of the 101 patients in the external validation cohort, 16 were in the BPD group. Multivariate logistic regression analysis showed that low birth weight ( OR=0.03, 95% CI: 0.01-0.13), nosocomial pneumonia ( OR=2.40, 95% CI: 1.41-4.09), late-onset sepsis ( OR=2.18, 95% CI: 1.18-4.02), and prolonged duration of endotracheal intubation ( OR=1.61, 95% CI: 1.26-2.04) were risk factors for BPD in these groups of infants (all P<0.05). According to the multivariate logistic regression analysis results, a nomogram model for predicting BPD risk was established. The AUC of the training cohort was 0.827 (95% CI: 0.783-0.872), and the ideal cut-off value for predicted probability was 0.206, with a sensitivity of 0.788 (95% CI: 0.697-0.862) and specificity of 0.744 (95% CI: 0.696-0.788). The AUC of the validation cohort was 0.951 (95% CI:0.904-0.999). Taking the prediction probability of 0.206 as the high-risk threshold, the sensitivity and specificity corresponding to this value were 0.812 (95% CI: 0.537-0.950) and 0.882 (95% CI: 0.790-0.939). The Hosmer-Lemeshow goodness-of-fit test in the training and validation cohort showed a good fit ( P>0.05). DCA results showed a high net benefit of clinical intervention in very preterm infants when the threshold probability was 5%~80% for the training cohort. Conclusion:Low birth weight, nosocomial pneumonia, late-onset sepsis, and prolonged tracheal intubation duration are risk factors for BPD. The established nomogram model has a certain value in predicting the risk of BPD in VLBW less than 32 weeks.

Objective To evaluate the role of preoperative serological indexes in predicting long-term survival and tumor recurrence of hepatocellular carcinoma (HCC) patients after liver transplantation, aiming to explore its significance in expanding the Milan criteria. Methods Clinical data of 669 recipients undergoing liver transplantation for HCC were retrospectively analyzed. The optimal cut-off value was calculated by the receiver operating characteristic (ROC) curve. The risk factors affecting the overall survival and recurrence-free survival rates of HCC patients after liver transplantation were identified by univariate and multivariate regression analyses. The correlation between preoperative serum liver enzymes and pathological characteristics in HCC patients was analyzed. The predictive values of alpha-fetoprotein (AFP) combined with γ -glutamyl transferase (GGT) and different liver transplant criteria for the survival and recurrence of HCC patients after liver transplantation were compared. Results Exceeded Milan criteria, total tumor diameter (TTD) > 8 cm, AFP > 200 ng/mL and GGT > 84 U/L were the independent risk factors for the overall survival and recurrence-free survival rates of HCC patients after liver transplantation (all P < 0.05). Correlation analysis showed that preoperative serum GGT level was correlated with TTD, number of tumor, venous invasion, microsatellite lesions, capsular invasion, tumor, node, metastasis (TNM) stage, Child-Pugh score and exceeded Milan criteria (all P < 0.05). Milan-AFP-GGT-TTD (M-AGT) criteria were proposed by combining Milan criteria, TTD with serum liver enzyme indexes (AFP and GGT). The 5-year overall survival and recurrence-free survival rates of HCC recipients who met the M-AGT criteria (111 cases of exceeded Milan criteria) were significantly higher than those who met Hangzhou criteria (both P < 0.05), whereas had no significant difference from their counterparts who met the University of California at San Francisco (UCSF) criteria (both P > 0.05). Conclusions Preoperative serological indexes of AFP and GGT could effectively predict the long-term survival and tumor recurrence of HCC patients after liver transplantation. Establishing the M-AGT criteria based on serological indexes contributes to expanding the Milan criteria, which is convenient and feasible.

Liver transplantation is an effective approach to treat intrahepatic cholangiocarcinoma (ICC). It is necessary to strictly control surgical indications of ICC because of its high invasiveness, lymph node metastasis and recurrence rate after liver transplantation. Liver transplantation yields high efficacy for single ICC with a diameterof ≤2 cm. For advanced ICC, neoadjuvant therapies including locoregional treatment and systemic chemotherapy should be initially delivered. According to the response of these neoadjuvant therapies, whether liver transplantation should be performed can be determined, and individualized adjuvant therapy should be delivered after operation. At present, multiple gene mutation targets and targeted therapeutic drugs for cholangiocarcinoma have been identified. Comprehensive treatment before and after liver transplantation may expand surgical indications of liver transplantation for ICC and improve clinical prognosis of the recipients. In this article, liver transplantation for ICC, neoadjuvant therapy before liver transplantation, postoperative adjuvant therapy and targeted therapy for ICC were reviewed.

Objective To evaluate the influence of age on the surgical risk and prognosis for elderly patients who suffered from lumbar spinal stenosis.Methods A total of 129 patients above 70 years old with lumbar stenosis from January 2015 to August 2018 were divided into 4 groups by age:younger than 69 years,70-74 years,75-79 years and 80 years and above.50 patients below 69 years old were chosen at random as control group.Different parameters such as operation methods,predicted complication rate (POSSUM score),actual complication rate,number of operation levels,operation time,surgical blood loss,occult blood loss,total hospital stay,postoperative hospital stay,hospital cost and the ODI score in 3 months followup were recorded.The surgical risk and prognosis of elderly patients were analyzed by comparing the differences of above parameters between different age groups.Results There was no significant correlation between different age groups and surgical methods (F=15.637,P=0.208).The operation time and surgical blood loss both showed no significant difference between 4 groups.The predicted incidence of complications (POSSUM score) in group older than 80 years old (38.5％+12.34％) and 75-79 years old (41.1％+ 11.82％) were higher than the group younger than 69 years old (28.4％+ 15.44％).There was no significant difference between the two groups over 75 years old,and there was no significant difference between the 70-74 years old group and the other three groups.The actual incidence of complications was 43.75％ in group over 80 years old,42.86％ in group 75-79 years old and 42.03％ in group 70-74 years old.The actual complication rate of the group younger than 69 years was lower than other three groups,and the three other groups showed no significant difference between each other.The totally hospital stay and numbers of operation levels in groups 75-79 and 80 years and above were higher than groups 70-74 and 69 years and below.There was no significant difference in those parameters between groups 75-79 and 80 years and above,and between groups 70-74 years and 69 years and below.The ODI scores between 4 groups also showed no significant difference.Conclusion The risk of surgery for lumbar disc stenosis patients older than 75 years has increased,but the patient's surgical outcome has not decreased.Old age should not be a key factor in determining whether a patient is suitable for surgery.

Objective To investigate the safety and efficacy of radiofrequency ablation (RFA) combined with extracting blood from hemangiomas guided with CEUS for treating hepatic cavernous hemangiomas (HCH).Methods Data of 55 patients with 77 lesions of HCH underwent CEUS guided RFA combined with extracting blood from hemangiomas during January 2010 to December 2016 were retrospectively analyzed.Conventional ultrasound and CEUS were performed before therapy,in order to obtain the size and blood supply information of lesions,also performed immediately after treatment and 3 months later to calculate the volume of hemangiomas and the rate of hemangiomas after the treatment,as well as the rate of non-blood supply 3 months after the treatment.Then statistical analysis was done.Results The mean operation time was (31.53±15.89)min,and the blood extracting from hemangiomas was (135.36± 68.13)ml.There was positive correlation between the volume of hemangiomas before treatment and the blood extracting from hemangiomas (r=0.722,P＜0.05).No serious complication occurred among 55 cases,while mild complications happened in 9 cases (9/55,16.36 ％).The volume of hemangiomas decreased immediately and 3 months after treatment (both P＜0.05),and the rate of hemangiomas reducing was (48.76±32.58) ％ and (22.37±35.73) ％,respectively.The rate of non-blood supply 3 months after treatment was 96.10％ (74/77).Conclusion CEUS-guided RFA combined with extracting blood from hemangiomas is an effective and safe method,which has potential to become a first-line therapy.

Objective To evaluate and discuss the clinical outcomes and advantages of midline lumbar fusion (MIDLF) with cortical bone trajectory (CBT) screw in the reoperation of lumbar disease. Methods From June 2014 to August 2015, a total of 12 patients, 5 male and 7 female with an average age of 68.5±5.6 years old (ranged from 56-76 years). The indications of reoper-ation including:5 cases of adjacent segment disease, 2 cases of discogenic back pain after lumbar dynamic stabilization, 5 cases of recurrent disc herniation. The interval time from primary surgery to second surgery was 3-9.5 years (average 6.0±2.0 years). Dis-ease level:L2/31 case, L3/42 cases, L4/57 cases, L5/S12 cases. All cases were got the X-ray, CT scan and MRI examination before surgery. The operative duration, blood loss, complications were all evaluated. Back and leg pain were recorded by visual analogue scale (VAS) scores. Functional recovery was evaluated by Oswestry disability index (ODI). Results Operative time was 110-210 min, and mean duration was (158.3±36.4) min. Blood loss was 150-310 ml, and mean loss was (231.7±51.0) ml. There was 1 case of cerebrospinal fluid leakage which treated with pillow supine for 1 week after surgery, and strengthened the prevention of antibi-otics, incision healing, with no headache and other low intracranial pressure of dizziness, the remaining patients had no intraopera-tive and postoperative complications. The time of follow-up was 12-25 months, with an average of (17.9 ± 4.6) months. The back pain of VAS score of preoperative was 3.9±1.4, and the last follow-up was 1.9±0.5, the difference was statistically significant (t=4.506, P=0.001). The VAS score of preoperative leg pain (4.9±1.4) was significant higher than the last follow-up (1.2±0.6, t=9.134, P=0.000). The preoperative ODI was 32.9±3.4, and last follow-up was 13.3±3.2, and the difference was statistically significant (t=15.002, P=0.000). Conclusion MIDLF was applicable with good clinical outcome and technical advantages in current cases, and it might be a choice of reoperation for lumbar disease.

Objective To assess the effects of the risk factors of grafts from donors after cardiac death (DCD) on the prognosis of liver transplantation (LT).Methods In this retrospectively study,215 cases of LT using DCD donor grafts were performed at our institution from September 2013 to January 2017.Due to the loss to follow-up in 4 cases,211 cases were enrolled in the study.The following DCD donor data were collected:gender,age,primary disease,ABO blood type,body mass index (BMI),medical history (fatty liver,hypertension),ICU hospitalization time,mechanical ventilation time,warm ischemia time,cold ischemia time,and indexes of routine laboratory test before donation.Statistical analyses using the Kaplan-Meier method,log-rank test,multivariate step-wise Cox regression were performed.Results Of the 211 donors,univariate analysis showed that the overall 6-month,1-,and 3-year survival rate after DCD LT was 88％,84％,and 82％,respectively.Univariate analysis showed that donor serum sodium level ＜136 mmol/L (P =0.018) and cold ischemia time ＞9 h (P =0.013) were all significant risk factors affecting overall survival after DCD LT.Additionally,donor BMI ＞30 kg/m2 (P =0.011) and donor age ＞60 years (P =0.025) were significantly associated with postoperative complications.Multivariate analysis showed that donor serum sodium level (P=0.025) was an independent risk factor of survival after DCD LT.Conclusion To select suitable DCD liver allografts and control risk factors of donor can help to improve outcomes of recipients.

Objective To analyse our clinical experience in pediatric living donor liver transplantation (PLDLT).Methods The clinical data of 45 patients who underwent PLDLT in our hospital from April 2005 to April 2014 were retrospectively studied and their preoperative,intraoperative and postoperative data were analyzed.Results All donors recovered well.The graft to recipient weight ratio (GRWR) ranged from 1.0％ ～ 6.4％ (2.5％ ± 1.2％).Size reduction of graft were performed in 2 patients.An interposition venous conduit from the confluence of the native right and left portal vein (PV) to the graft PV was carried out in 1 patient,venous grafts for revascularization of the tributaries of the middle hepatic vein from segment Ⅴ and Ⅷ were used in 3 patients,and a venous patch for revascularization of the left hepatic vein was used in 2 patients.Hepatic artery re-reconstruction was performed in 3 patients after hypoperfusion was detected on intraoperative Doppler ultrasound.The postoperative complications included acute rejection (n =2),vascular complications (n =7),biliary complications (n =11),and infectious complications (n =27).The 1-,2-and 5-year survival rates were all 84.4％.Seven of 45 recipients died within one year post transplantation,with 3 patients who died of vascular complications,and 4 patients who died of infection.The differences in age [(50.8 ± 49.8) months vs (12.6 ± 14.9) months],body weight [(16.2 ± 10.5) kg vs (7.3 ± 1.7) kg],serum total bilirubin [(177.0 ± 126.5) μmol/L vs (301.9 ± 110.6)μmol/L],Pediatric end-stage liver disease (PELD) score (16.1 ± 12.1 vs 26.2 ± 11.3) and GRWR (2.2％ ± 0.8％ vs 4.2％ ± 1.6％) between the survival and the dead groups were significant (P ＜ 0.05).Conclusions PLDLT is an effective method to treat children with end-stage liver disease.Using a multidisciplinary approach in the preoperative management,excellent surgical techniques,and proper postoperative management are extremely helpful to improve postoperative survival rate.

Objective To investigate the characteristics of infection and risk factors after pediatric living donor liver transplantation (PLDLT).Method Form April 2005 to April 2014 the clinical data of 45 cases of PLDLT in General Hospital of Chinese People's Armed Police Forces were retrospectively investigated,and the difference between the patients after PLDLT with infection and those without infection was analyzed.Result Eighty-four infections occurred in 27 (60.0％) of 45 patients,including 25 cases of bacterial infections,14 cases of viral infections,and 3 cases of candida albicans infections.Most infections occurring within 3 months after PLDLT have been found to be caused by bacteria,viruses and fungi.The trough level of tacrolimus (Tac) was in target therapeutic window in 16/20 infected patients and more than 10 ng/mL in 4/20 infected patients within 3 months after PLDLT,and there were 12/16 infected patients with the trough level of Tac of more than 10 ng/mL 3 months post-PLDLT,with the difference being significant (P＜0.05).Multivariate analysis revealed that post-transplant infection was significantly related with the factors as weight＜10 kg,age ＜12 months,biliary intestinal anastomosis,pediatric end-stage liver disease (PELD) score,ChildPugh score,total bilirubin,blood loss per kg body weight and graft to recipient weight ratio (GRWR).Logistic regression analysis suggested that PELD score was independent risk factor of infection after PLDLT.Conclusion The infection after PLDLT has their special characteristics.The proper irnmunosuppressive protocol and control of above risk factors are helpful to decrease the incidence of infection after PLDLT.

Objective TostudythevalueofordinarycolorDopplerflowimaging(CDFI)inthe diagnosis of hepatic artery thrombosis (HAT)in early stage after pediatric liver transplantation (PLT).Methods Clinicaldataof55childrenundergoingPLTintheGeneralHospitalofChinesePeople'sArmed Police Forces from April 2005 to May 2014 were analyzed retrospectively. Conventional hemodynamic monitoring was performed in all cases in the early stage after operation by CDFI. No intrahepatic arterial blood flow signal was observed by CDFI multi-angle examination and HAT was suspected. Computed tomography angiography (CTA)and surgical exploration were performed in the suspected HAT patients. The sensitivity and specificityofordinaryCDFIindiagnosingHATwerecalculatedbyChissstatisticalsoftware.Results Among the 55 PLT recipients,3 cases were suspected as HAT by CDFI,including 2 cases of HAT in the main hepatic artery,1 cases of HAT in the right hepatic artery. All cases were confirmed by CTA or surgical exploration.The incidence of HAT was 5% (3/55 ). The sensitivity and the specificity of CDFI in diagnosing HAT after PLTwereboth1.0,andfalsepositiveratewas0.Conclusions OrdinaryCDFIisthepreferredandmain method for hemodynamic examination after PLT. The experienced sonographer for transplantation can improve the accuracy in diagnosing HAT.