Objective To summarize the clinical course of acute interstitial pneumonitis (AIP) associated pediatric acute respiratory distress syndrome (PARDS) in 8 recipients after liver transplantation,and further discuss the potential risk factors and therapeutic highlights.Methods A total of 476 pediatric patients received liver transplantation in Tianjin First Center Hospital from January 2012 to September 2016.Among them,8 cases of AIP associated PARDS in ICU were recruited in this study.Medical data including clinical presentation,ICU management and outcomes were analyzed retrospectively.Results The onset time-window of AIP associated PARDS was (2.67 ± 0.77) months after liver transplantation,and the time interval between initial symptom and ICU administration was (6.75 ± 5.82) days.Five cases had the history of acute rejection therapy,and 5 cases had CMV and/or EBV viremia history.All 8 cases received mechanical ventilation,2 cases given nasal non-invasive ventilation and the rest 6 cases given invasive ventilation,3 of which were switched to high frequency oscillatory ventilation (HFOV) combined with inhaled nitric oxide.At the stage of hypoxic climax,the fraction of inspired oxygen (FiO2) was up-regulated to 1.0 to maintain the oxygenation index (OI) of (25.24 ± 5.94).Temporary replacement of immunosuppressants with intravenous glucocorticoids was implemented in all 8 cases without acute rejection episode.Of 8 cases,2 cases died from PARDS,1 case died from portal thrombosis associated hepatic failure,and the rest 5 cases survived.Conclusion AIP associated PARDS is a critical complication with high mortality in pediatric patients after liver transplantation.Excessively strong immunosuppression therapy at early post-transplant stage shows a risk factor for AIP.Lung protective ventilation strategy and HFOV are recommended to reduce ventilator induced lung injury in pediatric patients.Temporary intravenous glucocorticoids may reduce acute inflammatory reaction in PARDS patients without increasing the risk of acute rejection.

Objective To evaluate necessity of colonoscopy in symptomatic subjects with colorectal neoplasia screening score.Methods Data of consecutive patients who underwent routine colonoscopy between October 2015 and December 2015 were prospectively collected.APCS score and HKCS score were used to evaluate the detection rate of colorectal tumors in groups of different risks and to predict the necessity of colonoscopy in symptomatic subjects.Results There were 815 subjects with mean age of 51.2± 14.8 years.Colorectal neoplasia and advanced neoplasia were identified in 170 (20.9％) and 43 (5.3％) cases.APCS score was classified as average risk (AR),moderate risk (MR) and high risk (HR),which included 234,400 and 161 cases,respectively.The detection rates of colorectal neoplasia in AR,MR and HR groups were 9.5％,20.0％ and 41.0％,respectively,and those of advanced neoplasia were 0％,5.5％ and 13.0％,respectively.Detection rate of colorectal neoplasia in the HR group showed 6.7 times of that in the AR group (95％CI:3.9-11.2).HKCS score was classified as AR and HR,which included 633 and 182 cases in the present study.The detection rates of colorectal neoplasia in these groups were 16.3％ and 36.8％,and those of advanced neoplasia were 3.2％ and 12.6％.Detection rate of colorectal neoplasia in HR group was 3.0 times of that in AR group (95％CI:2.1-4.3).Conclusion APCS score and HKCS score are both suitable for evaluating the necessity of colonoscopy in symptomatic subjects.It is necessary for HR patients to undergo colonoscopy to detect colorectal neoplasia,however,AR patients evaluated by APCS score can delay colonoscopy to economize medical resources and avoid unnecessary complications.

Objective To explore the necessity of colonoscopy in young patients with chronic constipation.Methods Data of patients aged 18-50 underwent colonoscopy at Tianjin Medical University General Hospital with chronic constipation as the sole indication between April 2003 and May 2014 were analyzed.Endoscopic and pathologic reports were analyzed.Results During the study period,a total of 563 patients were included,who were aged 18-50 with chronic constipation as the sole indication,of which 260 patients were aged 18-35,and 303 patients were aged 36-50.No lesion was found during colonoscopy in 167 (29.7％) patients,whereas in other 396 (70.3 ％) patients positive findings were reported,including polyps in 45 patients (of which 13 were with multiple polyps),adenomas in 20(17 in distal colon,3 in proximal colon).In patients aged 18-35,3 cases of adenomas(3/260,1.2％) were found,of which 1 patient (1/260,0.4％)had advanced adenoma.In patients aged 36-50,17 cases of adenomas(17/303,5.6％) were found,of which 4 (4/303,1.3％) were advanced ones.Colorectal cancers were found in 2 patients (0.7％,2/303),both in patients aged 36-50.The detection rate for colorectal neoplasms (including adenoma and cancer) in patients with chronic constipation aged 18-35 was significantly lower than that in patients aged 36-50[1.2％(3/260) VS 6.3％(19/303),P=0.002,95％CI:0.05-0.60].Conclusion The detection rate for colorectal neoplasms in patients aged 18-35 years with chronic constipation is relatively low,and colonoscopy is not recommended for them.

Aim To study the effect of artesunate on immuno-injured hepatic fibrosis induced by bovine ser-um albumin in rat model and the effect of artesunate on hepatic stellate cells ( HSCs ) proliferation, so as to provide experimental evidence for clinical application of artesunate and the treatment of hepatic fibrosis. Methods The model of immuno-injured hepatic fibro-sis induced by bovine serum albumin was established in Wistar rats. Rats were randomly divided into 5 groups:normal group, model group, low dose of arte-sunate, middle dose of artesunate and high dose of ar-tesunate. Drugs were given to the corresponding thera-peutic groups, and then were continued once a day for two months. Distilled water was given to the rats of normal and model groups according to the same meth-od. Liver tissues were used for measuring the content of collagen, the rat serum activities of albumin( Alb) , alanine aminotransferase ( ALT ) and aspartate amin-otransferase(AST). Liver tissue’ s pathological chan-ges were observed by HE and collagen staining. Isola-ted and cultured rat primary HSCs in the flask for 10 days to make cells activated, MTT assay was used to detect rate of cellular proliferation; concentration of hydroxyproline in supernatant was detected by digestive method; the expression of p53 was investigated by Western blot and RT-PCR. Results Serum levels of Alb in model group were significantly lower ( P <0. 05 ) , and levels of ALT and AST in model group were significantly higher ( P <0. 05 ) compared with normal group. Levels of AST in low, middle and high dose groups(3. 2, 9. 6, 28. 8 mg·kg-1 ) were signifi-cantly lower(P <0. 05) compared with model group, and levels of ALT in high dose groups were significant-ly lower(P<0. 01) compared with model group. The contents of collagen in model groups were significantly higher(P<0. 01) compared with normal group, while the contents of collagen in therapy groups significantly decreased ( P < 0. 05 ) compared with model group. Activated HSCs treated with various concentrations of artesunate (150, 175, 200 μmol·L-1 ) were inhibi-ted on dose and time-effect relationships. Production/secretion of hydroxyproline decreased after HSCs was treated by artesunate for 24 h; the expression of p53 was up-regulated showed by Western blot and RT-PCR in artesunate treated cells. Conclusion Artesunate brings about anti-fibrosis in vitro and in vivo by increas-ing the expression of p53 .

Objective In order to make up for the deficiency in the existing photoplethysmography feature point recognition algorithms which need manually setting the selecting threshold and have poor adaptability to complex waveforms, an automatic reognition algorithm for feature points based on monotonic increase in geometrical characteristics of pulse wave ascending branch was proposed. Methods A ‘reference point’ was determined in each pulse period by zero crossing detection after two Hilbert transformation. The nearest concave and convex inflection points that searched around the ‘reference points’ were the notchs and systolic peaks. Results By using the 18 sets of data in the MIT-BIH standard database for verification, the average sensitivity, precision and detection accuracy reached 99.94%, 99.72% and 99.68%, respectively. Compared with the existing four algorithms, there was a significant improvement in the precision. Feature points could still be accurately identified for complex waveforms. Conclusions The proposed algorithm achieved a higher detection accuracy in the process of searching and determining the position of the pulse wave notchs and systolic peaks, and exhibited a stronger adaptability to the waveform change. The research results provide a good foundation for physiological and pathological analysis through pulse wave features extraction in clinic.

Objective To observe the effects of maternal high fat diet (MHFD) during pregnancy and lactation on intestinal barrier function in offspring mice.Methods C57BL/6 pregnant mice were divided into high fat diet (MHFD) group and normal diet group (MND) randomly and were given high fat diet and normal diet during pregnancy (3 weeks) and lactation (3 weeks) respectively.Both groups of offspring mice were naturally given and bodyweight of pups was monitored at birth and weekly.After weaning,the intestinal permeability of offspring mice was detected by fluorescein isothiocyanate conjugated-dextran method (FITC-D).Immunofluorescence was used to detect the expression of ZO-1 in intestinal tissues.HE staining was used to assess the villus length and crypt depth.The intestinal cell proliferation (expression of Ki-67) and Mucin 2 (MUC2) were assessed by immunohistochemistry.PAS staining was used to evaluate the goblet cells.The expression of inflammatory cytokines including IL-1β,IL-6,and TNF-α in intestinal tissue were measured by real-time PCR.Results At the age of 2 and 3 weeks,the offspring in MHFD group were significantly heavier than those in MND group.HE staining showed no obvious microscopic inflammation in both groups of 3 weeks old offspring mice,however,the relative expression levels of IL-1β (1.95±0.53 vs.1.13±0.15;t =3.65,P=0.005),IL-6 (1.40±0.71 vs.0.73±0.17;t=2.72,P=0.04),and TNF-α (1.63±0.53 vs.1.04±0.12;t=2.64,P=0.02) mRNA were significantly higher in the MHFD group.Compared with the 3 weeks old offspring mice in MND group,MHFD significantly increased the permeability of intestine and decreased the expression of ZO-1 in membrane.The number of Ki-67 positive cells (18.00±4.74 vs.24.60±4.17;t =3.31,P=0.004) in each villus,goblet cells (14.70±2.91 vs.28.10±4.95;t =7.38,P＜0.001) and MUC2 positive cells (20.60± 3.13 vs.30.00±3.33;t=6.50,P＜0.001) in each crypt were significantly lower than those in MND group.Conclusion Maternal high fat diet in early life of offspring mice can induce intestinal low grade inflammation and lead to the disruption of intestinal mucosal barrier in offspring mice,which may be involved in the progeny diseases.

Objective:To investigate the clinical application of continuous renal replacement therapy (CRRT) in infants with acute kidney injury (AKI) after liver transplantation.Methods:A retrospective study was conducted on infants with AKI after liver transplantation in Tianjin First Center Hospital from January 1, 2019 to June 1, 2021. Infants with AKI within 1 year after liver transplantation were divided into CRRT group and non-CRRT group according to whether CRRT was performed. The preoperative and intraoperative condition, the postoperative complications were compared, the risk factors of CRRT for AKI infants, the clinical characteristics of CRRT were analyzed, and the prognosis between CRRT group and non-CRRT group were compared.Results:① A total of 512 cases of pediatric liver transplantation were performed. A total of 189 cases (36.9%) developed AKI within 1 year after surgery, including 18 cases in CRRT group and 171 cases in non-CRRT group. ② There was no significant difference in preoperative conditions between the two groups. The duration of liver transplantation (hours: 8.8±1.5 vs. 7.5±1.3) and intraoperative blood loss [mL: 370 (220-800) vs. 310 (200-400)] in CRRT group were significantly higher than those in non-CRRT group. CRRT group had significantly higher incidence of postoperative complication [unplanned operation: 8 cases (44.4%) vs. 14 cases (8.2%), primary nonfunction: 1 case (5.6%) vs. 0 case (0%), retransplantation: 3 cases (16.7%) vs. 0 case (0%), hepatic artery thrombosis: 3 cases (16.7%) vs. 4 cases (2.3%), intestinal fistula: 2 cases (11.1%) vs. 2 cases (1.2%)] than non-CRRT group (all P < 0.05). ③ The average start time of CRRT was 10 (1-240) days. The per capita frequency of CRRT treatment was 3.3 (1.0-14.0) times. The average duration of each CRRT treatment was 10.1 (6.0-19.3) hours, the average reduction rate of serum creatinine (SCr) was 25.6% (13.5%-45.0%) after CRRT. ④ In CRRT group, 5 patients died, the 1-year and 2-year survival rates were both 72.22%. In non-CRRT group, 6 patients died, the 1-year and 2-year survival rates were 97.1% and 96.5%, respectively. There were significant differences in 1-year and 2-year survival rates between the two groups (both P < 0.01). Conclusions:The incidence of AKI after pediatric liver transplantation was high, and most infants treated with CRRT were associated with serious surgical complications. CRRT was a powerful means to remove inflammatory factors and maintain the stability of circulation and internal environment, which could improve the multi-organ dysfunction effectively.

Objective:To explore the risk factors for the occurrence of thrombocytopenia (TCP) within 2 weeks after pediatric liver transplantation (LT) and examine the relationship between the occurrence of TCP and prognosis.Methods:From January 2021 to November 2021, clinical data were retrospectively reviewed for 162 pediatric LT recipients aged under 4 years at Organ Transplantation Center of Tianjin First Central Hospital.Based upon the lowest value of platelet count at Week 2 post-operation, they were assigned into two groups of TCP (n=90) and non-TCP (n=72). General preoperative profiles, intraoperative findings, postoperative complications, types of commonly used antibiotics, anticoagulant dosing and prognosis of two groups were compared.Univariate and multivariate analyses were utilized for examining the independent risk factors for TCP.Receiver operating characteristic (ROC) curve was plotted for examining the cut-off value of independent risk factors for diagnosing TCP.Results:Among them, 90 (55.56%) developed TCP within 2 weeks post-operation and 25(15.43%) developed TCP at Day 1 post-operation.The median preoperative platelet count was 178×10 9/L and the lowest value was 65×10 9/L at Day 3(1-4) post-operation with a declining rate of 63.5% and platelet count of recipient normalized at Day 6(4-7.25) post-operation.The results of univariate analysis showed statistically significant inter-group differences in operative duration[(574.43±80.53)min vs.(526.75±72.42)min], intraoperative blood loss[400(300, 550)ml vs.320(300, 400)ml], red blood cell transfusion[2(2, 3)U vs.2(1.5, 2.0)U], preoperative platelet count[178.5(141.75, 242.5)×10 9/L vs.257 (209.75, 357)×10 9/L], postoperative infection rate[27.8%(25/90)vs.13.9%(10/72)] and dosing rates of piperacillin sodium and tazobactam sodium[8.9%(8/90)vs.25.0%(18/72)] ( P<0.05). Multivariate Logistic regression analysis revealed statistically significant inter-group differences in operative duration( P=0.008), red blood cell transfusion( P=0.01), preoperative platelet count( P<0.01) and postoperative infection rate ( P=0.02). The results of ROC curve analysis showed that the cut-off values of operative duration, red blood cell transfusion and preoperative platelet count were 535 min, 2.75 U and 183.5×10 9/L respectively.Length of ICU stay was higher in TCP group than that in non-TCP group, and the difference was statistically significant [4(3, 5) vs.3(3, 4) day, P=0.006]. Conclusions:LT children aged under 4 years with intraoperative red blood cell transfusion>2.75 U, operative duration>535 min and preoperative platelet count<183.5×10 9/L are more likely to develop post-transplantation TCP.And occurrence of TCP prolongs the length of ICU stay in pediatric recipients.

Objective To probe into the total number and development status of respiratory physicians in China, and to analyze existing problems, for reference in making strategy and policy decisions in professional development of respiratory physicians in the country. Methods The basic information of China′s healthcare institutions and healthcare manpower in 2015 were provided by the Statistics Center of the National Health Commission. The number of respiratory specialists and their profile, drawn from such basic information, were subject to descriptive statistics. Results In 2015, there were 2.729 million medical practitioners ( including assistant doctors ) nationwide, 30.3 thousand among whom being respiratory physicians, accounting for 1.11% of the total. Among these respiratory physicians, practicing respiratory physicians account for 87.1% , respiratory physicians with a master degree and above account for only 19.7% , respiratory physicians with over 10 years of working experience account for 65.8% , respiratory physicians with senior titles account for only 21.4% , and 89.4% of the respiratory physicians work in general hospitals. Conclusions By the criteria of specializing in respiratory specialty over five years and being attending or above, the number approximates 14. 6 thousand nationwide. If practicing ( assistant) physicians specializing in respiratory specialty are also included, the number may hit 30. 3 thousand. Such a number, compared with other specialties, may be sufficient, yet their competence is far from satisfactory. Therefore it is imperative to build a standardized pulmonary medicine fellowship training system for their competence improvement.

Objective To explore the effectiveness of octreotide therapeutic strategy to attenuate portal hyperperfusion resulted from small-for-size graft in infant liver transplantation.Methods A total of 22 infants received small-for-size liver graft (defined as GV/SLV＜0.5,and GV＜ 150 g) in our hospital from December 2013 to August 2016.Twelve cases (octreotide group) were treated with intravenous octreotide infusion (300 g daily for 24-96 h) to attenuate the portal hyperperfusion after transplantation,and the rest 10 cases given liver transplantation at the early stage did not receive the intervention of octreotide and served as control group.Results The initial portal vein flows (PVFs) in octreotide group and control group were (413.43 ± 76.24) (390.83 ± 107.89) ml/(min 100 g),and there was no significant difference between two groups (P＞0.05).The PVFs on postoperative day (POD) 3 and POD5 in octreotide group and control group were (334.90 ± 96.67) and (441.04 ± 117.41),and (322.20 ± 81.04) and (423.23 ± 100.81) mL/(min 100 g) respectively (P＜0.05 for all).However,there were no significant differences in serum AST and bilirubin levels at four time points (initial,POD3,POD5 and POD7) after transplantation between two groups (P＞0.05).The incidence of hepatic artery occlusion,and biliary complications in octreotide group and ontrol group was 33.33％ and 44.44％,and 33.33％ and 11.11％ respectively (P ＞ 0.05 for all).Conclusion Octreotide treatment attenuated portal hyperperfusion resulted from small-for-size graft in infant liver transplantation.However,the effects of octreotide therapy on graft biochemical tests,the hepatic artery and biliary complications were still unclear,and further investigation is needed.