1.A comparative analysis of the efficacy of direct mechanical thrombectomy versus bridging therapy in acute anterior circulation large vessel occlusion patients with atrial fibrillation
Kai DU ; Juehua ZHU ; Xiuying CAI ; Jieqin GONG ; Jizhen LI ; Hanchun CHEN ; Yiming MAO ; Qi FANG
Chinese Journal of Neurology 2025;58(3):277-285
Objective:To compare the efficacy and safety differences between direct mechanical thrombectomy (abbreviated as direct thrombectomy) and bridging therapy in patients with acute anterior circulation large vessel occlusion and atrial fibrillation.Methods:A retrospective collection of data was conducted for hospitalized patients who underwent mechanical thrombectomy due to acute anterior circulation large vessel occlusion with atrial fibrillation at the First Affiliated Hospital of Soochow University and Suzhou Kowloon Hospital, Shanghai Jiao Tong University School of Medicine from January 1, 2018 to December 31, 2022. Patients were divided into direct thrombectomy and bridging therapy groups based on whether intravenous thrombolysis was used, and the clinical outcomes and safety indicators of the two groups were compared. The primary clinical outcomes included the modified Rankin Scale (mRS) score at 90 days and the proportion of patients with neurological independence at 90 days (the proportion of patients with mRS scores of 0-2). Safety indicators included 90-day mortality rate, intracranial hemorrhage rate, symptomatic intracranial hemorrhage [deterioration of neurological function and an increase of ≥4 points in the National Institutes of Health Stroke Scale (NIHSS) score] rate, and pneumonia incidence. Using the 90-day prognosis as a dependent variable, a binary Logistic regression analysis was conducted to investigate the factors influencing poor prognosis in patients at 90 days.Results:Among the 534 screened patients, 125 were included in the study, with 74 in the direct thrombectomy group and 51 in the bridging therapy group. The difference in the mRS scores at 90 days between the direct thrombectomy group and the bridging therapy group was not statistically significant [2 (0, 3) vs 3 (1, 3), Z=-1.444, P=0.149]. The difference in the proportion of patients with independent neurological function at 90 days [66.2% (49/74) vs 47.1% (24/51), χ2=4.561, P=0.033] was statistically significant between the 2 groups. The 90-day mortality rate [5.4% (4/74) vs 9.8% (5/51), χ 2=0.936, P=0.483], the intracranial hemorrhage rate [17.6% (13/74) vs 29.4% (15/51), χ 2=2.437, P=0.119], the symptomatic intracranial hemorrhage rate [12.2% (9/74) vs 23.5% (12/51), χ 2=2.791, P=0.095], and the pneumonia incidence [59.5% (44/74) vs 56.9% (29/51), χ 2=0.084, P=0.772] between the 2 groups showed no statistically significant differences (all P>0.05). The time from admission to puncture was 97 (74, 122) min and 150 (127, 168) min for the direct thrombectomy and bridging therapy groups, respectively, with a statistically significant difference ( Z=-5.846, P<0.001). Binary Logistic regression analysis showed that venous thrombolysis (adjusted OR=3.004, 95% CI 1.057-8.539, P=0.039), NIHSS score at onset (adjusted OR=1.096, 95% CI 1.009-1.191, P=0.030), and pneumonia (adjusted OR=12.814, 95% CI 3.775-43.499, P<0.001) were associated with poor prognosis at 90 days. Conclusion:For patients with acute anterior circulation large vessel occlusion and atrial fibrillation, direct thrombectomy can increase the proportion of neurological independence at 90 days compared to bridging therapy, with no statistically significant differences in safety indicators, which may be related to the shorter time from admission to puncture in the direct thrombectomy group.
2.Study on the efficacy and safety of Metformin hydrochloride enteric-coated capsules in patients with type 2 diabetes mellitus
Yiming WU ; Jian ZHANG ; Nan GU ; Qijuan DONG ; Ruiyun LIU ; Hong ZHANG ; Haixia LIU ; Yongcai ZHAO ; Lin CHENG ; Lianshan PU ; Fang BIAN ; Gang HE ; Quanmin LI ; Wei DU ; Zhaoling WANG ; Wei XU ; Liyong ZHONG ; Xiaohui GUO
Chinese Journal of Diabetes 2025;33(3):210-214
Objective To evaluate the efficacy and safety of enteric-coated metformin hydrochloride capsules(Junlida?)in patients with T2DM and poor glycemic control under lifestyle interventions.Methods In this study,419 patients with T2DM were recruited from 15 research centers from July 2020 to March 2022,and randomly divided into observation(Obs)group(n=209)and control group(Con,n=210)using a multicenter,randomized,double-blind,non-inferiority trial design.Patients in the Obs group were treated with enteric-coated Metformin hydrochloride capsules(Junlida?),and patients in the Con group were treated with Metformin hydrochloride tablets(Glucophage?).The optimal effective dose of 2 g/d was achieved within 4 weeks,and the reasonable dose was maintained until the end of treatment.The treatment period was 24 weeks.HbA1c and its compliance rate,FPG,and body weight were compared between the two groups in full analysis set(FAS)and protocol set(PPS).Safety and adverse events(AE)were evaluated in safety set(SS).Results A total of 414 participants were randomized(207 cases in Obs group and 207 cases in Con group).414 cases in FAS population(207 cases in Obs group and 207 cases in Con group),and 328 cases in PPS population(164 cases in Obs group and 164 cases in Con group),and 414 cases in SS population(207 cases in Obs group and 207 cases in Con group).After treatment,HbA1c,FPG and body weight were lower in both groups(P<0.05)in FAS and PPS.HbA1c compliance rate was not significantly different between the two groups in FAS and PPS(P>0.05).The results of non-inferiority test showed that the lower limit was>-0.4%in both FAS(-0.154,95%CI-0.384~0.069)and PPS(-0.139,95%CI-0.390~0.112),and the Obs group reached non-inferiority end point.The achievement rate,compliance rate,safety index and incidence of AE were not significantly different between the two groups(P>0.05).Conclusions Junlida? demonstrated non-inferiority to Glucophage? in glycemic control and can be safely and effectively used in patients with diabetes.
3.Study on the efficacy and safety of Metformin hydrochloride enteric-coated capsules in patients with type 2 diabetes mellitus
Yiming WU ; Jian ZHANG ; Nan GU ; Qijuan DONG ; Ruiyun LIU ; Hong ZHANG ; Haixia LIU ; Yongcai ZHAO ; Lin CHENG ; Lianshan PU ; Fang BIAN ; Gang HE ; Quanmin LI ; Wei DU ; Zhaoling WANG ; Wei XU ; Liyong ZHONG ; Xiaohui GUO
Chinese Journal of Diabetes 2025;33(3):210-214
Objective To evaluate the efficacy and safety of enteric-coated metformin hydrochloride capsules(Junlida?)in patients with T2DM and poor glycemic control under lifestyle interventions.Methods In this study,419 patients with T2DM were recruited from 15 research centers from July 2020 to March 2022,and randomly divided into observation(Obs)group(n=209)and control group(Con,n=210)using a multicenter,randomized,double-blind,non-inferiority trial design.Patients in the Obs group were treated with enteric-coated Metformin hydrochloride capsules(Junlida?),and patients in the Con group were treated with Metformin hydrochloride tablets(Glucophage?).The optimal effective dose of 2 g/d was achieved within 4 weeks,and the reasonable dose was maintained until the end of treatment.The treatment period was 24 weeks.HbA1c and its compliance rate,FPG,and body weight were compared between the two groups in full analysis set(FAS)and protocol set(PPS).Safety and adverse events(AE)were evaluated in safety set(SS).Results A total of 414 participants were randomized(207 cases in Obs group and 207 cases in Con group).414 cases in FAS population(207 cases in Obs group and 207 cases in Con group),and 328 cases in PPS population(164 cases in Obs group and 164 cases in Con group),and 414 cases in SS population(207 cases in Obs group and 207 cases in Con group).After treatment,HbA1c,FPG and body weight were lower in both groups(P<0.05)in FAS and PPS.HbA1c compliance rate was not significantly different between the two groups in FAS and PPS(P>0.05).The results of non-inferiority test showed that the lower limit was>-0.4%in both FAS(-0.154,95%CI-0.384~0.069)and PPS(-0.139,95%CI-0.390~0.112),and the Obs group reached non-inferiority end point.The achievement rate,compliance rate,safety index and incidence of AE were not significantly different between the two groups(P>0.05).Conclusions Junlida? demonstrated non-inferiority to Glucophage? in glycemic control and can be safely and effectively used in patients with diabetes.
4.A comparative analysis of the efficacy of direct mechanical thrombectomy versus bridging therapy in acute anterior circulation large vessel occlusion patients with atrial fibrillation
Kai DU ; Juehua ZHU ; Xiuying CAI ; Jieqin GONG ; Jizhen LI ; Hanchun CHEN ; Yiming MAO ; Qi FANG
Chinese Journal of Neurology 2025;58(3):277-285
Objective:To compare the efficacy and safety differences between direct mechanical thrombectomy (abbreviated as direct thrombectomy) and bridging therapy in patients with acute anterior circulation large vessel occlusion and atrial fibrillation.Methods:A retrospective collection of data was conducted for hospitalized patients who underwent mechanical thrombectomy due to acute anterior circulation large vessel occlusion with atrial fibrillation at the First Affiliated Hospital of Soochow University and Suzhou Kowloon Hospital, Shanghai Jiao Tong University School of Medicine from January 1, 2018 to December 31, 2022. Patients were divided into direct thrombectomy and bridging therapy groups based on whether intravenous thrombolysis was used, and the clinical outcomes and safety indicators of the two groups were compared. The primary clinical outcomes included the modified Rankin Scale (mRS) score at 90 days and the proportion of patients with neurological independence at 90 days (the proportion of patients with mRS scores of 0-2). Safety indicators included 90-day mortality rate, intracranial hemorrhage rate, symptomatic intracranial hemorrhage [deterioration of neurological function and an increase of ≥4 points in the National Institutes of Health Stroke Scale (NIHSS) score] rate, and pneumonia incidence. Using the 90-day prognosis as a dependent variable, a binary Logistic regression analysis was conducted to investigate the factors influencing poor prognosis in patients at 90 days.Results:Among the 534 screened patients, 125 were included in the study, with 74 in the direct thrombectomy group and 51 in the bridging therapy group. The difference in the mRS scores at 90 days between the direct thrombectomy group and the bridging therapy group was not statistically significant [2 (0, 3) vs 3 (1, 3), Z=-1.444, P=0.149]. The difference in the proportion of patients with independent neurological function at 90 days [66.2% (49/74) vs 47.1% (24/51), χ2=4.561, P=0.033] was statistically significant between the 2 groups. The 90-day mortality rate [5.4% (4/74) vs 9.8% (5/51), χ 2=0.936, P=0.483], the intracranial hemorrhage rate [17.6% (13/74) vs 29.4% (15/51), χ 2=2.437, P=0.119], the symptomatic intracranial hemorrhage rate [12.2% (9/74) vs 23.5% (12/51), χ 2=2.791, P=0.095], and the pneumonia incidence [59.5% (44/74) vs 56.9% (29/51), χ 2=0.084, P=0.772] between the 2 groups showed no statistically significant differences (all P>0.05). The time from admission to puncture was 97 (74, 122) min and 150 (127, 168) min for the direct thrombectomy and bridging therapy groups, respectively, with a statistically significant difference ( Z=-5.846, P<0.001). Binary Logistic regression analysis showed that venous thrombolysis (adjusted OR=3.004, 95% CI 1.057-8.539, P=0.039), NIHSS score at onset (adjusted OR=1.096, 95% CI 1.009-1.191, P=0.030), and pneumonia (adjusted OR=12.814, 95% CI 3.775-43.499, P<0.001) were associated with poor prognosis at 90 days. Conclusion:For patients with acute anterior circulation large vessel occlusion and atrial fibrillation, direct thrombectomy can increase the proportion of neurological independence at 90 days compared to bridging therapy, with no statistically significant differences in safety indicators, which may be related to the shorter time from admission to puncture in the direct thrombectomy group.
5.Hypercalcaemia crisis: A retrospective series of 143 cases
Yang LIU ; Xianling WANG ; Qinghua GUO ; Jin DU ; Yu PEI ; Jianming BA ; Weijun GU ; Jingtao DOU ; Zhaohui LYU ; Yiming MU
Chinese Journal of Endocrinology and Metabolism 2024;40(2):115-120
Objective:The study retrospectively analyzed the etiology, clinical manifestations, emergency treatment and etiological treatment of a large sample of cases with hypercalcemic crisis.Methods:The clincial data of patients with hypercalcaemia cirisis who were administered in First Medical Center of Chinese PLA General Hospital from January 2009 to July 2022 were analyzed, inculding the general data, clinical manifestations, etiology, photographic examination, emergency treatment, etiological treatment, serological examination before and after treatment, pathological immunohistochemical findings and prognosis.Results:A total of 143 hypercalcaemia crisis patients(84 males and 59 females) with a mean age of 53.51±16.60 were enrolled. The most common disease was hyperparathyroidism(62/143), followed by solid malignancy(57/143) and multiple myeloma(12/143). Patients presented with digestive system symptoms at 76.91%, followed by neurological symptoms at 63.60%, urinary system symptoms at 58.76%, musculoskeletal symptoms at 55.23%, and cardiovascular system symptoms at 32.91%. After emergency calcium-lowering treatment, the remission rate of hypercalcemic crisis in 143 patients was 100%(143/143), and after etiological treatment, the remission rate of hypercalcemia was 85.31%(122/143).Conclusion:Early identification, emergency treatment and etiology treatment of hypercalcaemia crisis are essential. Effective treament with comprehensive calcium reduction can quickly relieve clinical symptoms and create opportunities for treatment for the cause. Targeted etiological interventions can lead to the correction or long-term remission of hypercalcemia.
6.Preliminary mining and analysis of ADE signal of ofatumumab
Xiaojuan YANG ; Qingwen ZHANG ; Xiaosa DU ; Jinpeng DONG ; Yiming HU ; Shudi WANG ; Yubin FENG
China Pharmacy 2024;35(17):2120-2125
OBJECTIVE To screen potential adverse drug event (ADE) signals for the treatment of multiple sclerosis (MS) with ofatumumab, and to provide reference for the safe use of drugs in clinical practice. METHODS Using “ofatumumab” and the trade name “Kesimpta” as the search keywords, adverse event (AE) reports related to ofatumumab included in FDA Adverse Event Reporting System database from January 2009 to December 2023 were screened, and their reason contained the “multiple sclerosis”; ADE signal mining and analysis were conducted by reporting odds ratio method and proportional reporting ratio method. RESULTS A total of 21 759 eligible AE reports were selected, involving 62 449 AE cases; 27 system organ classes included general diseases and various reactions at the site of administration (15 021 cases), neurological diseases (9 668 cases), infectious and invasive diseases (5 967 cases), injury, poisoning and surgical complications (4 952 cases), musculoskeletal and connective tissue disorders (4 647 cases). A total of 21 759 AE reports correspond to 606 ADE signals, including 234 ADE positive signals. A total of 107 ADE positive signals were not included in drug instruction of ofatumumab, including flu-like diseases, nasopharyngitis, cough, urinary tract infection, sore throat, insomnia, runny nose, anemia, hair loss, atrial fibrillation, and thrombocytopenia, etc. CONCLUSIONS In the process of using ofatumumab for MS, sufficient attention should be paid to ADE included in drug instructions. The ADE with strong signal strength screened in this study should also be paid special attention to, such as flu-like diseases, hemocytopenia, temperature intolerance, optic neuritis, and moyamoya disease. The increased risk of infection, cardiovascular disease, and potential damage to the respiratory and spiritual systems caused by ofatumumab can not be ignored.
7.Clinical effects of probiotics combined with bismuth quadruple therapy for Helicobacter pylori infected patients
Min GUI ; Qiuyun GU ; Yusen HU ; Chenyuan YAN ; Ying SHAO ; Lina XIA ; Jieyi HE ; Peiying WU ; Yiming HONG ; Qiuju DU
Shanghai Journal of Preventive Medicine 2024;36(5):482-487
ObjectiveTo investigate the effects of probiotics combined with bismuth quadruple therapy (BQT) on clinical efficacy、gastrointestinal adverse reactions and intestinal flora in Helicobacter pylori (HP) positive patients. MethodsThe patients who were positive for HP from May 2023 to July 2023 in the department of gastroenterology of Shanghai first people's hospital were randomly divided into2 groups with 40 people in each group. The probiotic group was given 2 weeks of quadruple therapy with probiotics and standard BQT, followed by 4 weeks of oral probiotics after quadruple discontinuation. The placebo group was given 2 weeks of probiotic placebo and standard BQT, followed by 4 weeks of oral probiotic placebo. 13C urea breath test was used to evaluate the clinical efficacy, gastrointestinal symptoms rating Scale was used to evaluate the gastrointestinal adverse reactions of patients before and after the intervention, and microbial diversity 16S rDNA sequencing technology was used to detect the level of intestinal flora of patients before and after the intervention. ResultsThere was no significant difference in the eradication rate between the two groups (P>0.05). Before the intervention, there was no significant difference in the scores of the gastrointestinal symptom rating scale between the probiotic group and the placebo group. After the intervention, patients in the probiotic group had significantly lower pain scores on acid reflux (1.10±0.30 vs 1.35±0.53, P<0.05) and stomach or abdominal hunger than in the placebo group (1.07±0.26 vs 1.30±0.52, P<0.05). Through the before-and-after comparison of the probiotic group, the scores of abdominal pain (1.24±0.44 vs 1.58±0.71, P<0.05), stomach or abdominal hunger (1.07±0.26 vs 1.27±0.45, P<0.05) and dry and hard stool (1.24±0.49 vs 1.48±0.75,P<0.05) were significantly lower in the probiotic group than before the intervention in the probiotic group. ConclusionProbiotics combined with BQT can improve the gastrointestinal adverse reactions and intestinal flora disorders in the process of quadruple drug therapy, but it does not improve the eradication rate of HP.
8.Analysis of pollution status and influencing factors of polybrominated diphenyl ethers in household dust in five cities in northern China
Xiaotong ZHANG ; Yun CAO ; Wenying ZHANG ; Linlin JIANG ; Mengmeng LIU ; Fengjing SONG ; Tingting LIU ; Chengyu CHEN ; Li LI ; Hang LIU ; Lin FAN ; Hang DU ; Yiming SUN ; Chao WANG ; Bin LUO ; Xianliang WANG
Chinese Journal of Preventive Medicine 2024;58(10):1514-1523
Objective:To investigate the pollution levels and influencing factors of polybrominated diphenyl ethers (PBDEs) in household dust in five cities in northern China.Methods:Based on the "Chinese Indoor Environment and Health Surveillance" project carried out by the National Institute of Environmental Health, Chinese Center for Disease Control and Prevention in 2018-2019, during the warm season (April 2018 to September 2018) and the cold season (November 2018 to March 2019), Lanzhou in Northwest China, Shijiazhuang in North China, Panjin in Northeast China, Luoyang in Central China, and Qingdao in East China were selected as the research sites. A total of 87 families were recruited to study residences in real-life scenarios. At the same time, dust samples were collected to detect the concentration of PBDEs. The level of household environmental indicators was measured, and the residential building characteristics and family behavior habits were collected through questionnaires. A total of 142 valid dust samples and 140 valid questionnaires were obtained. The differences in PBDE concentrations across seasons, wind zones, residential building characteristics, and family habits were analyzed. The exploratory factor analysis was performed to investigate the possible sources of PBDEs, and multivariate linear regression was used to explore the factors influencing PBDEs in household dust.Results:The M ( Q1,Q3) of total PBDE concentrations in 142 household dust samples in five cities was 144.51 (106.61, 222.65) ng/g in the warm season and 145.10 (98.57, 180.65) ng/g in the cold season, respectively. There were seasonal differences in the concentration of ∑ 12PBDEs in Luoyang and Shijiazhuang ( P<0.01). The concentration of BDE-71 was highest among PBDE homologues, followed by BDE-66 and BDE-47. Three factors were extracted by exploratory factor analysis in the warm season, and the cumulative variance contribution rate was 67.90%. The multivariate linear regression showed that the house completion less than ten years [ β (95% CI): 0.186 (0.013, 0.359)], infrequent home cooking [ β (95% CI):-0.342 (-0.570, -0.114)], and increased residential PM 10 concentration [ β (95% CI): 0.001 (0.000, 0.002)] during the warm season, as well as the house far from driveway [ β (95% CI): 0.093 (0.013, 0.172)], house area less than 90 m 2 [ β (95% CI):-0.138 (-0.264, -0.013)], and lower residential xylene concentration [ β (95% CI):-0.006 (-0.011, -0.001)] during the cold season might be related to the elevated concentrations of ∑ 12PBDEs in household dust. Conclusion:The pollution of PBDEs in household dust in five northern cities is at a medium to high level. Years of house completion, frequency of cooking at home, residential PM 10 concentration, distance from house to driveway, house area, and residential xylene concentration may influence household PBDE concentrations.
9.Establishment and validation of a prediction model of hip fracture risk factors in elderly stroke patients
Li DU ; Yiming MA ; Hui ZHAO ; Guiyun CUI ; Jie ZU
Chinese Journal of Tissue Engineering Research 2024;28(36):5793-5798
BACKGROUND:Prevention of fractures after stroke is very important,and there are currently no models to predict the occurrence of hip fractures after stroke. OBJECTIVE:To investigate the risk factors leading to hip fracture in stroke patients and to establish a risk prediction model to visualize this risk. METHODS:A total of 439 stroke patients were selected from the Affiliated Hospital of Xuzhou Medical University from June 2014 to June 2017,including 107 males and 332 females,with a mean age of(71.38±9.74)years.They were divided into fracture group(n=35)and non-fracture group(n=404)according to the presence or absence of hip fracture.Univariate and multivariate analyses were used to determine the risk factors for hip fracture after stroke.The data were randomly divided into training set(70%)and test set(30%).Nomogram predicting the risk of hip fracture occurrence was created based on the results of the multifactor analysis,and performance was evaluated using receiver operating characteristic curve,calibration curves,and decision curve analysis.A web calculator was created to facilitate a more convenient interactive experience for clinicians. RESULTS AND CONCLUSION:(1)Univariate analysis showed significant differences between the two groups in the number of falls,smoking,hypertension,glucocorticoids,number of strokes,Mini-Mental State Examination,visual acuity level,National Institute of Health Stroke Scale,Berg Balance Scale,and Stop Walking When Talking scale scores(P<0.05).(2)Multivariate analysis showed that number of falls[OR=17.104,95%CI(3.727-78.489),P=0.000],National Institute of Health Stroke Scale[OR=1.565,95%CI(1.193-2.052),P=0.001],Stop Walking When Talking[OR=12.080,95%CI(2.398-60.851),P=0.003]were independent risk factors positively associated with new hip fractures.Bone mineral density[OR=0.155,95%CI(0.044-0.546),P=0.012]and Berg Balance Scale[OR=0.840,95%CI(0.739-0.954),P=0.007]were negatively associated with new hip fractures after stroke.(3)The AUC values of nomogram were 0.956 and 0.907 in the training and test sets,respectively,and the calibration curves showed a high agreement between predicted and actual status with an area under the decision curve of 0.038 and 0.030,respectively.(4)These findings conclude that the number of falls,low bone mineral density,low Berg Balance Scale score,high National Institute of Health Stroke Scale score,and positive Stop Walking When Talking are risk factors for hip fracture after stroke.Based on this,a nomogram with high accuracy was developed and a web calculator(https://stroke.shinyapps.io/DynNomapp/)was created.
10.Analysis of pollution status and influencing factors of polybrominated diphenyl ethers in household dust in five cities in northern China
Xiaotong ZHANG ; Yun CAO ; Wenying ZHANG ; Linlin JIANG ; Mengmeng LIU ; Fengjing SONG ; Tingting LIU ; Chengyu CHEN ; Li LI ; Hang LIU ; Lin FAN ; Hang DU ; Yiming SUN ; Chao WANG ; Bin LUO ; Xianliang WANG
Chinese Journal of Preventive Medicine 2024;58(10):1514-1523
Objective:To investigate the pollution levels and influencing factors of polybrominated diphenyl ethers (PBDEs) in household dust in five cities in northern China.Methods:Based on the "Chinese Indoor Environment and Health Surveillance" project carried out by the National Institute of Environmental Health, Chinese Center for Disease Control and Prevention in 2018-2019, during the warm season (April 2018 to September 2018) and the cold season (November 2018 to March 2019), Lanzhou in Northwest China, Shijiazhuang in North China, Panjin in Northeast China, Luoyang in Central China, and Qingdao in East China were selected as the research sites. A total of 87 families were recruited to study residences in real-life scenarios. At the same time, dust samples were collected to detect the concentration of PBDEs. The level of household environmental indicators was measured, and the residential building characteristics and family behavior habits were collected through questionnaires. A total of 142 valid dust samples and 140 valid questionnaires were obtained. The differences in PBDE concentrations across seasons, wind zones, residential building characteristics, and family habits were analyzed. The exploratory factor analysis was performed to investigate the possible sources of PBDEs, and multivariate linear regression was used to explore the factors influencing PBDEs in household dust.Results:The M ( Q1,Q3) of total PBDE concentrations in 142 household dust samples in five cities was 144.51 (106.61, 222.65) ng/g in the warm season and 145.10 (98.57, 180.65) ng/g in the cold season, respectively. There were seasonal differences in the concentration of ∑ 12PBDEs in Luoyang and Shijiazhuang ( P<0.01). The concentration of BDE-71 was highest among PBDE homologues, followed by BDE-66 and BDE-47. Three factors were extracted by exploratory factor analysis in the warm season, and the cumulative variance contribution rate was 67.90%. The multivariate linear regression showed that the house completion less than ten years [ β (95% CI): 0.186 (0.013, 0.359)], infrequent home cooking [ β (95% CI):-0.342 (-0.570, -0.114)], and increased residential PM 10 concentration [ β (95% CI): 0.001 (0.000, 0.002)] during the warm season, as well as the house far from driveway [ β (95% CI): 0.093 (0.013, 0.172)], house area less than 90 m 2 [ β (95% CI):-0.138 (-0.264, -0.013)], and lower residential xylene concentration [ β (95% CI):-0.006 (-0.011, -0.001)] during the cold season might be related to the elevated concentrations of ∑ 12PBDEs in household dust. Conclusion:The pollution of PBDEs in household dust in five northern cities is at a medium to high level. Years of house completion, frequency of cooking at home, residential PM 10 concentration, distance from house to driveway, house area, and residential xylene concentration may influence household PBDE concentrations.

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