Objective:To investigate the current status of vascular access team building and analysis its related factors in hemodialysis centers in China.Methods:The study was a cross-sectional survey. Using a convenience sampling method, a questionnaire was designed to investigate the clinical practice of vascular access teams in 527 hemodialysis centers in China from March to April 2022. The related factors of the formation of vascular access teams and the setting up of vascular access coordinators (VAC) were analyzed by multivariate logistic regression method.Results:A total of 506 valid questionnaires were recovered, with a recovery rate of 96.02%. There were 247 (48.81%) and 193 (38.14%) hemodialysis centers respectively across China that had built vascular access teams and set up VAC. Hemodialysis centers with more than 10 years of practice had higher rate of implementation than those in hemodialysis centers with practice years less or equal than 10 years in developing standardized procedures for vascular access management ( χ 2=8.288, P=0.004), holding continuous quality improvement meetings on vascular access ( χ 2=8.210, P=0.004), establishing vascular access teams ( χ 2=33.805, P<0.001) and setting up vascular access coordinators ( χ 2=16.038, P<0.001), and the difference was statistically significant. The results of multivariate logistic regression analysis showed that the number of dialysis machines ( OR=2.221, 95% CI 1.118-4.415, P=0.023), the number of patients on dialysis( OR=2.946, 95% CI 1.375-6.310, P=0.005), and the establishment of VAC positions ( OR=9.463, 95% CI 5.307-16.874, P<0.001), and the standardized vascular access management process ( OR=3.383, 95% CI 2.012-5.687, P<0.001) were the related factors of vascular access team building. The related factors of setting up a VAC position in hemodialysis center were opening vascular access clinic ( OR=2.704,95% CI 1.382-5.290, P=0.004), the formation of a vascular access team ( OR=9.464, 95% CI 5.312-16.860, P<0.001), and constructing standardized procedures for vascular access management ( OR=3.663, 95% CI 2.243-5.982, P<0.001). Conclusion:The implementation rates of vascular access team and VAC position in hemodialysis centers were 48.81% and 38.14%, respectively. The number of dialysis machines, the number of patients on dialysis, the standardized procedures for vascular access management, the vascular access clinic, the vascular access team, and the VAC position were the relevant factors of the team building for vascular access.

Objective:To summarize the clinicopathologic characteristics of malignant hypertension (MHT) patients with acute kidney injury (AKI) and application of renin-angiotensin-aldosterone system inhibitor (RAASi).Methods:It was a retrospective cohort study. The adult patients with MHT and AKI admitted to Peking University First Hospital from January 1, 2012 to July 14, 2022. The patients were categorized into RAASi group and non-RAASi group based on RAASi administration from AKI onset to discharge. The clinicopathological data between the two groups were compared, and application of RAASi was analyzed.Results:A total of 179 patients were enrolled with age of 31 (26, 37) years and 148 males (82.7%). Ninety-five patients (53.1%) received dialysis treatment. The common causes of MHT were essential hypertension (125 patients, 69.8%), renal hypertension (39 patients, 21.8%) and endocrine hypertension (7 patients, 3.9%). AKI severity distribution showed 41 patients (22.9%) in stage 1, 1 patient (0.5%) in stage 2 and 137 patients (76.5%) in stage 3. Among MHT patients, 94 patients (52.5%) had been treated with RAASi before AKI, and 13 patients (7.3%) discontinued RAASi after AKI. Among 85 patients (47.5%) without receiving RAASi treatment before AKI, 68 new patients (38.0%) received RAASi treatment after AKI, and 40 patients (22.3%) were treated with the support of dialysis. Compared with non-RAASI group ( n=30), proportions of chronic kidney disease ( χ2=6.324, P=0.012) and post-AKI hyperkalemia ( χ2=4.048, P=0.044) in RAASi group ( n=149) were lower, and the proportion of dialysis treatment ( χ2=5.638, P=0.018), admission diastolic blood pressure ( Z=-3.609, P<0.001) and maximum diastolic blood pressure during hospitalization ( Z=-1.978, P=0.048) were higher. There were no statistically significant differences in the rates of target blood pressure control and renal function recovery between the two groups during hospitalization (all P>0.05). During hospitalization, 64 patients received renal biopsies, of which 50 patients (78.1%) had typical MHT vascular lesions such as "onion skin" in renal arterioles. Twenty-seven patients (42.2%) were complicated with glomerular diseases, and IgA nephropathy was the most common type (85.2%, 23/27). The proportions of glomerular ischemia and sclerosis, endothelial cell proliferation and acute renal tubular injury in RAASi group ( n=54) were lower than those in non-RAASi group ( n=10), and proportions of thrombosis and "onion skin" change were higher than those in RAASi group ( n=10), but the differences were not statistically significant (all P>0.05). Renal function recovery occurred in 47 patients (26.3%) by discharge. Among 95 dialysis patients, 26 patients (27.4%) achieved dialysis independence at discharge. Conclusions:MHT patients with AKI exhibit severe renal pathology and short-term poor prognosis. RAASi is primarily prescribed to those with relatively better kidney function or those receiving dialysis support.

Objective:To investigate the correlation between statins and contrast-induced acute kidney injury (CI-AKI) and provide a reference basis for clinical practice.Methods:It was a retrospective cohort study. The adult patients were admitted to Peking University First Hospital from January 1, 2018, to December 31, 2020, and received at least one intravascular iodinated contrast administration during hospitalization. The clinical data of the patients were collected. The enrolled patients were divided into statin group and non-statin group according to statin exposure. The exposure of statins was defined as use of any type of statins within 48 hours before iodinated contrast administration. The primary outcome was in-hospital AKI defined as AKI developed after contrast administration and before discharge, with 30 days as the endpoint observation time, and the secondary outcome was post-contrast AKI (PC-AKI) defined as AKI onset within 72 hours after contrast administration. Cox regression model was applied to investigate the correlation between statin prescription prior to contrast administration and clinical outcomes. Pre-specified interaction analysis was conducted to examine modification effect of age, gender, baseline estimated glomerular filtration rate (eGFR), diabetes and the injection method of contrast.Results:Among 10 321 enrolled patients, the age was 63 (54, 71) years old, and 6 274 (60.8%) patients were males. There were 2 372 (23.0%) patients taking statins before the use of iodinated contrast agents, and the person-time incidence rate of in-hospital AKI was 2.5 per 1 000 person-days. The person-time incidence rate of statin users and statin non-users was 3.2 and 2.4 per 1 000 person-days, respectively. Compared with the non-statin group, age, serum creatinine and the proportions of males, admitted to the intensive care unit, lipid metabolism disorder, hypertension, diabetes, cerebrovascular diseases, cardiovascular diseases, using renin-angiotensin- aldosterone inhibitors, using diuretics, using non-steroidal anti-inflammatory drugs, using proton pump inhibitors, iodinated contrast administration via artery, eGFR<60 ml·min -1·(1.73 m 2) -1 were higher, while the proportions of general anesthesia surgery, severe liver diseases and tumors, and eGFR were lower in the statin group (all P<0.05). Among 10 321 patients, 5 867 patients had serum creatinine measurement within 72 hours after iodinated contrast administration, among which 70 patients (4.0 per 1 000 person-days) developed PC-AKI. Multivariate Cox regression analysis showed that statin use was an independent protective factor for in-hospital AKI ( HR=0.65, 95% CI 0.45?0.93, P=0.017) and PC-AKI ( HR=0.44, 95% CI 0.22?0.88, P=0.020). Subgroup analysis showed the significant interaction between diabetes and statin use ( P for interaction=0.039), and the protective effect of statins against in-hospital AKI was only observed in non-diabetic group ( HR=0.45, 95% CI 0.26?0.77). There were no significant differences in subgroups stratified by age, sex, baseline eGFR and the injection method of contrast (all P for interaction>0.05). Conclusions:Statin use prior to iodinated contrast administration is correlated with reduced risks of in-hospital AKI and PC-AKI in hospitalized patients, and the correlation between statin use and in-hospital AKI is more significant in non-diabetic patients. It is suggested that statin use before the application of iodinated contrast agents in hospitalized patients may prevent the occurrence of AKI.

Objective:To investigate the serum sodium level and its fluctuation in patients with hospitalized acquired acute kidney injury (AKI) and explore their impacts on in-hospital mortality.Methods:It was a single-center retrospective study. The adult patients developing hospital-acquired AKI and receiving at least twice serum sodium tests admitted to Peking University First Hospital from January 1, 2018, to December 31, 2020 were included. Dysnatremia included hyponatremia (< 135 mmol/L) and hypernatremia (>145 mmol/L). The patients were divided into hyponatremia group, normal serum sodium group and hypernatremia group, and the differences of clinical data among the three groups were compared. The fluctuation of serum sodium level was evaluated by coefficient of variation. A restricted cubic spline was applied to investigate the association between serum sodium level at AKI onset and mortality. Poisson regression analysis was used to explore the mortality risk of dysnatremia at AKI onset, dysnatremia at admission, and coefficient of variation of serum sodium, respectively.Results:Among the enrolled 1 475 AKI patients, the age was 66.0 (55.0, 78.0) years, and 850 patients (57.6%) were males. The estimated glomerular filtration rate was 77.3 (50.4, 97.6) ml·min -1·(1.73 m 2) -1. The time from admission to AKI onset was 8 (4, 15) days. The incidence of hyponatremia and hypernatremia at admission were 19.6% (289/1 475) and 2.6% (39/1 475), respectively, while the incidence at AKI onset was 24.0% (354/1 475) and 12.7% (188/1 475), respectively. There was statistically significant difference in terms of age, the initial classification distribution of AKI, serum sodium at admission, serum sodium at the occurrence of AKI, the lowest serum sodium at hospitalization, the highest serum sodium at hospitalization, the coefficient of variation of serum sodium, and the proportions of heart failure, stroke, disseminated intravascular coagulation, sepsis, acute respiratory distress syndrome, shock, prerenal causes, circle diuretics and aldosterone antagonists among hyponatremia group, normal serum sodium group and hypernatremia group (all P<0.05). The restricted cubic spline analysis showed a "U"-shaped correlation between serum sodium level at AKI onset and in-hospital mortality. Poisson regression analysis showed that after adjusting for age, gender, number of chronic comorbidities, initial classification of AKI, basal estimated glomerular filtration rate and number of acute disease state, with normal serum sodium as the reference, hyponatremia ( RR=1.56, 95% CI 1.14-2.13) and hypernatremia ( RR=1.71, 95% CI 1.23-2.39) at AKI onset were correlated with an increased risk of in-hospital mortality. Hyponatremia at admission was correlated with an increased risk of in-hospital mortality ( RR=2.13, 95% CI 1.62-2.79), while there was no statistically significant association between hypernatremia and in-hospital mortality ( RR=1.22, 95% CI 0.62-2.44). After further adjusting serum sodium levels at admission and at the occurrence of AKI, the coefficient of variation of serum sodium level was still correlated with an increased risk of in-hospital mortality ( RR=1.23, 95% CI 1.14-1.33). Conclusions:Dysnatremia is common in patients with hospital-acquired AKI. The serum sodium level at AKI onset is correlated with in-hospital death in a "U" shape. Dysnatremia and serum sodium fluctuation are associated with an increased risk of in-hospital mortality.

Objective:To investigate the current status of vascular access team building and analysis its related factors in hemodialysis centers in China.Methods:The study was a cross-sectional survey. Using a convenience sampling method, a questionnaire was designed to investigate the clinical practice of vascular access teams in 527 hemodialysis centers in China from March to April 2022. The related factors of the formation of vascular access teams and the setting up of vascular access coordinators (VAC) were analyzed by multivariate logistic regression method.Results:A total of 506 valid questionnaires were recovered, with a recovery rate of 96.02%. There were 247 (48.81%) and 193 (38.14%) hemodialysis centers respectively across China that had built vascular access teams and set up VAC. Hemodialysis centers with more than 10 years of practice had higher rate of implementation than those in hemodialysis centers with practice years less or equal than 10 years in developing standardized procedures for vascular access management ( χ 2=8.288, P=0.004), holding continuous quality improvement meetings on vascular access ( χ 2=8.210, P=0.004), establishing vascular access teams ( χ 2=33.805, P<0.001) and setting up vascular access coordinators ( χ 2=16.038, P<0.001), and the difference was statistically significant. The results of multivariate logistic regression analysis showed that the number of dialysis machines ( OR=2.221, 95% CI 1.118-4.415, P=0.023), the number of patients on dialysis( OR=2.946, 95% CI 1.375-6.310, P=0.005), and the establishment of VAC positions ( OR=9.463, 95% CI 5.307-16.874, P<0.001), and the standardized vascular access management process ( OR=3.383, 95% CI 2.012-5.687, P<0.001) were the related factors of vascular access team building. The related factors of setting up a VAC position in hemodialysis center were opening vascular access clinic ( OR=2.704,95% CI 1.382-5.290, P=0.004), the formation of a vascular access team ( OR=9.464, 95% CI 5.312-16.860, P<0.001), and constructing standardized procedures for vascular access management ( OR=3.663, 95% CI 2.243-5.982, P<0.001). Conclusion:The implementation rates of vascular access team and VAC position in hemodialysis centers were 48.81% and 38.14%, respectively. The number of dialysis machines, the number of patients on dialysis, the standardized procedures for vascular access management, the vascular access clinic, the vascular access team, and the VAC position were the relevant factors of the team building for vascular access.

Objective:To summarize the clinicopathologic characteristics of malignant hypertension (MHT) patients with acute kidney injury (AKI) and application of renin-angiotensin-aldosterone system inhibitor (RAASi).Methods:It was a retrospective cohort study. The adult patients with MHT and AKI admitted to Peking University First Hospital from January 1, 2012 to July 14, 2022. The patients were categorized into RAASi group and non-RAASi group based on RAASi administration from AKI onset to discharge. The clinicopathological data between the two groups were compared, and application of RAASi was analyzed.Results:A total of 179 patients were enrolled with age of 31 (26, 37) years and 148 males (82.7%). Ninety-five patients (53.1%) received dialysis treatment. The common causes of MHT were essential hypertension (125 patients, 69.8%), renal hypertension (39 patients, 21.8%) and endocrine hypertension (7 patients, 3.9%). AKI severity distribution showed 41 patients (22.9%) in stage 1, 1 patient (0.5%) in stage 2 and 137 patients (76.5%) in stage 3. Among MHT patients, 94 patients (52.5%) had been treated with RAASi before AKI, and 13 patients (7.3%) discontinued RAASi after AKI. Among 85 patients (47.5%) without receiving RAASi treatment before AKI, 68 new patients (38.0%) received RAASi treatment after AKI, and 40 patients (22.3%) were treated with the support of dialysis. Compared with non-RAASI group ( n=30), proportions of chronic kidney disease ( χ2=6.324, P=0.012) and post-AKI hyperkalemia ( χ2=4.048, P=0.044) in RAASi group ( n=149) were lower, and the proportion of dialysis treatment ( χ2=5.638, P=0.018), admission diastolic blood pressure ( Z=-3.609, P<0.001) and maximum diastolic blood pressure during hospitalization ( Z=-1.978, P=0.048) were higher. There were no statistically significant differences in the rates of target blood pressure control and renal function recovery between the two groups during hospitalization (all P>0.05). During hospitalization, 64 patients received renal biopsies, of which 50 patients (78.1%) had typical MHT vascular lesions such as "onion skin" in renal arterioles. Twenty-seven patients (42.2%) were complicated with glomerular diseases, and IgA nephropathy was the most common type (85.2%, 23/27). The proportions of glomerular ischemia and sclerosis, endothelial cell proliferation and acute renal tubular injury in RAASi group ( n=54) were lower than those in non-RAASi group ( n=10), and proportions of thrombosis and "onion skin" change were higher than those in RAASi group ( n=10), but the differences were not statistically significant (all P>0.05). Renal function recovery occurred in 47 patients (26.3%) by discharge. Among 95 dialysis patients, 26 patients (27.4%) achieved dialysis independence at discharge. Conclusions:MHT patients with AKI exhibit severe renal pathology and short-term poor prognosis. RAASi is primarily prescribed to those with relatively better kidney function or those receiving dialysis support.

Objective:To investigate the correlation between statins and contrast-induced acute kidney injury (CI-AKI) and provide a reference basis for clinical practice.Methods:It was a retrospective cohort study. The adult patients were admitted to Peking University First Hospital from January 1, 2018, to December 31, 2020, and received at least one intravascular iodinated contrast administration during hospitalization. The clinical data of the patients were collected. The enrolled patients were divided into statin group and non-statin group according to statin exposure. The exposure of statins was defined as use of any type of statins within 48 hours before iodinated contrast administration. The primary outcome was in-hospital AKI defined as AKI developed after contrast administration and before discharge, with 30 days as the endpoint observation time, and the secondary outcome was post-contrast AKI (PC-AKI) defined as AKI onset within 72 hours after contrast administration. Cox regression model was applied to investigate the correlation between statin prescription prior to contrast administration and clinical outcomes. Pre-specified interaction analysis was conducted to examine modification effect of age, gender, baseline estimated glomerular filtration rate (eGFR), diabetes and the injection method of contrast.Results:Among 10 321 enrolled patients, the age was 63 (54, 71) years old, and 6 274 (60.8%) patients were males. There were 2 372 (23.0%) patients taking statins before the use of iodinated contrast agents, and the person-time incidence rate of in-hospital AKI was 2.5 per 1 000 person-days. The person-time incidence rate of statin users and statin non-users was 3.2 and 2.4 per 1 000 person-days, respectively. Compared with the non-statin group, age, serum creatinine and the proportions of males, admitted to the intensive care unit, lipid metabolism disorder, hypertension, diabetes, cerebrovascular diseases, cardiovascular diseases, using renin-angiotensin- aldosterone inhibitors, using diuretics, using non-steroidal anti-inflammatory drugs, using proton pump inhibitors, iodinated contrast administration via artery, eGFR<60 ml·min -1·(1.73 m 2) -1 were higher, while the proportions of general anesthesia surgery, severe liver diseases and tumors, and eGFR were lower in the statin group (all P<0.05). Among 10 321 patients, 5 867 patients had serum creatinine measurement within 72 hours after iodinated contrast administration, among which 70 patients (4.0 per 1 000 person-days) developed PC-AKI. Multivariate Cox regression analysis showed that statin use was an independent protective factor for in-hospital AKI ( HR=0.65, 95% CI 0.45?0.93, P=0.017) and PC-AKI ( HR=0.44, 95% CI 0.22?0.88, P=0.020). Subgroup analysis showed the significant interaction between diabetes and statin use ( P for interaction=0.039), and the protective effect of statins against in-hospital AKI was only observed in non-diabetic group ( HR=0.45, 95% CI 0.26?0.77). There were no significant differences in subgroups stratified by age, sex, baseline eGFR and the injection method of contrast (all P for interaction>0.05). Conclusions:Statin use prior to iodinated contrast administration is correlated with reduced risks of in-hospital AKI and PC-AKI in hospitalized patients, and the correlation between statin use and in-hospital AKI is more significant in non-diabetic patients. It is suggested that statin use before the application of iodinated contrast agents in hospitalized patients may prevent the occurrence of AKI.

Objective:To investigate the serum sodium level and its fluctuation in patients with hospitalized acquired acute kidney injury (AKI) and explore their impacts on in-hospital mortality.Methods:It was a single-center retrospective study. The adult patients developing hospital-acquired AKI and receiving at least twice serum sodium tests admitted to Peking University First Hospital from January 1, 2018, to December 31, 2020 were included. Dysnatremia included hyponatremia (< 135 mmol/L) and hypernatremia (>145 mmol/L). The patients were divided into hyponatremia group, normal serum sodium group and hypernatremia group, and the differences of clinical data among the three groups were compared. The fluctuation of serum sodium level was evaluated by coefficient of variation. A restricted cubic spline was applied to investigate the association between serum sodium level at AKI onset and mortality. Poisson regression analysis was used to explore the mortality risk of dysnatremia at AKI onset, dysnatremia at admission, and coefficient of variation of serum sodium, respectively.Results:Among the enrolled 1 475 AKI patients, the age was 66.0 (55.0, 78.0) years, and 850 patients (57.6%) were males. The estimated glomerular filtration rate was 77.3 (50.4, 97.6) ml·min -1·(1.73 m 2) -1. The time from admission to AKI onset was 8 (4, 15) days. The incidence of hyponatremia and hypernatremia at admission were 19.6% (289/1 475) and 2.6% (39/1 475), respectively, while the incidence at AKI onset was 24.0% (354/1 475) and 12.7% (188/1 475), respectively. There was statistically significant difference in terms of age, the initial classification distribution of AKI, serum sodium at admission, serum sodium at the occurrence of AKI, the lowest serum sodium at hospitalization, the highest serum sodium at hospitalization, the coefficient of variation of serum sodium, and the proportions of heart failure, stroke, disseminated intravascular coagulation, sepsis, acute respiratory distress syndrome, shock, prerenal causes, circle diuretics and aldosterone antagonists among hyponatremia group, normal serum sodium group and hypernatremia group (all P<0.05). The restricted cubic spline analysis showed a "U"-shaped correlation between serum sodium level at AKI onset and in-hospital mortality. Poisson regression analysis showed that after adjusting for age, gender, number of chronic comorbidities, initial classification of AKI, basal estimated glomerular filtration rate and number of acute disease state, with normal serum sodium as the reference, hyponatremia ( RR=1.56, 95% CI 1.14-2.13) and hypernatremia ( RR=1.71, 95% CI 1.23-2.39) at AKI onset were correlated with an increased risk of in-hospital mortality. Hyponatremia at admission was correlated with an increased risk of in-hospital mortality ( RR=2.13, 95% CI 1.62-2.79), while there was no statistically significant association between hypernatremia and in-hospital mortality ( RR=1.22, 95% CI 0.62-2.44). After further adjusting serum sodium levels at admission and at the occurrence of AKI, the coefficient of variation of serum sodium level was still correlated with an increased risk of in-hospital mortality ( RR=1.23, 95% CI 1.14-1.33). Conclusions:Dysnatremia is common in patients with hospital-acquired AKI. The serum sodium level at AKI onset is correlated with in-hospital death in a "U" shape. Dysnatremia and serum sodium fluctuation are associated with an increased risk of in-hospital mortality.

Objective To investigate the practice and barriers to functional monitoring of autogenous arteriove-nous fistula(AVF)in hemodialysis centers in China.Methods Using convenience sampling,from March to April 2022,a questionnaire was designed based on the literature of AVF functional monitoring,and a total of 527 hemodialysis centers in China were investigated from 3 aspects,including monitoring process and system,monitoring method and cont ent,and monitoring team construction.Results 506 questionnaires were effectively recovered,with a recovery rate of 96.02％.The implementation rate of the 12 entries of AVF functional monitoring ranged from 12.65％～79.84％,with an overall score of(4.97±3.03).The scores had statistically significant differences in 6 admin-istrative regions of China in monitoring process and system,monitoring method and content,and monitoring team building,as well as the total scores(P＜0.001).Barriers were centered on management specification,human resource allocation,professional training,and healthcare costs.Conclusion Hospital administrators should construct and per-fect the relevant management system according to the scale and actual situation of different hemodialysis centers,strengthen the supervision of AVF functional monitoring as well as the personalised management of monitoring pro-tocols,and promote the development of a multidisciplinary cooperation model for vascular access.

Objective:This study aims to summarize the experience of building a research data platform at Peking University First Hospital and propose pathways for constructing healthcare big data platforms in medical institutions to provide insights for the further expansion of the application of the health care big data platform and construction of smart healthcare.Methods:Hospital multi-domain data was collected through a systematic process. After data classification and cleaning, international medical standards and NLP technology were utilized to achieve data standardization and structuring. At the same time, the eCRF form, data source judgment, and mathematical calculations were optimized to ensure the data quality and application value of the scientific research data platform.Results:By carrying out the construction of a scientific research data platform, Peking University First Hospital achieved the transformation of clinical data into research data, completed data collection, pushing, integration, cleaning, and governance, and conducted health care big data research.Conclusions:It is recommended to subsequently expand the data scope, promote the transformation of clinical data into research data, enhance clinical experts' participation in prospective design and data collection, use an integrated data platform for automatic data pushing and calling, explore the application of large language models and conduct technical exploration and reserves.