1.Phenylpropanoids from roots of Berberis polyantha.
Dong-Mei SHA ; Shuai-Cong NI ; Li-Niu SHA-MA ; Hai-Xiao-Lin-Mo MA ; Xiao-Yong HE ; Bin HE ; Shao-Shan ZHANG ; Ying LI ; Jing WEN ; Yuan LIU ; Xin-Jia YAN
China Journal of Chinese Materia Medica 2025;50(6):1564-1568
The chemical constituents were systematically separated from the roots of Berberis polyantha by various chromatographic methods, including silica gel column chromatography, HP20 column chromatography, polyamide column chromatography, reversed-phase C_(18) column chromatography, and preparative high-performance liquid chromatography. The structures of the compounds were identified by physicochemical properties and spectroscopic techniques(1D NMR, 2D NMR, UV, MS, and CD). Four phenylpropanoids were isolated from the methanol extract of the roots of B. polyantha, and they were identified as(2R)-1-(4-hydroxy-3,5-dimethoxyphenyl)-1-propanone-O-β-D-glucopyranoside(1), methyl 4-hydroxy-3,5-dimethoxybenzoate(2),(+)-syringaresinol(3), and syringaresinol-4-O-β-D-glucopyranoside(4). Compound 1 was a new compound, and other compounds were isolated from this plant for the first time. The anti-inflammatory activity of these compounds was evaluated based on the release of nitric oxide(NO) in the culture of lipopolysaccharide(LPS)-induced RAW264.7 macrophages. At a concentration of 10 μmol·L~(-1), all the four compounds inhibited the LPS-induced release of NO in RAW264.7 cells, demonstrating potential anti-inflammatory properties.
Plant Roots/chemistry*
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Animals
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Mice
;
Berberis/chemistry*
;
RAW 264.7 Cells
;
Macrophages/immunology*
;
Drugs, Chinese Herbal/isolation & purification*
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Nitric Oxide/metabolism*
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Molecular Structure
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Anti-Inflammatory Agents/isolation & purification*
2.Effects of Hot Night Exposure on Human Semen Quality: A Multicenter Population-Based Study.
Ting Ting DAI ; Ting XU ; Qi Ling WANG ; Hao Bo NI ; Chun Ying SONG ; Yu Shan LI ; Fu Ping LI ; Tian Qing MENG ; Hui Qiang SHENG ; Ling Xi WANG ; Xiao Yan CAI ; Li Na XIAO ; Xiao Lin YU ; Qing Hui ZENG ; Pi GUO ; Xin Zong ZHANG
Biomedical and Environmental Sciences 2025;38(2):178-193
OBJECTIVE:
To explore and quantify the association of hot night exposure during the sperm development period (0-90 lag days) with semen quality.
METHODS:
A total of 6,640 male sperm donors from 6 human sperm banks in China during 2014-2020 were recruited in this multicenter study. Two indices (i.e., hot night excess [HNE] and hot night duration [HND]) were used to estimate the heat intensity and duration during nighttime. Linear mixed models were used to examine the association between hot nights and semen quality parameters.
RESULTS:
The exposure-response relationship revealed that HNE and HND during 0-90 days before semen collection had a significantly inverse association with sperm motility. Specifically, a 1 °C increase in HNE was associated with decreased sperm progressive motility of 0.0090 (95% confidence interval [ CI]: -0.0147, -0.0033) and decreased total motility of 0.0094 (95% CI: -0.0160, -0.0029). HND was significantly associated with reduced sperm progressive motility and total motility of 0.0021 (95% CI: -0.0040, -0.0003) and 0.0023 (95% CI: -0.0043, -0.0002), respectively. Consistent results were observed at different temperature thresholds on hot nights.
CONCLUSION
Our findings highlight the need to mitigate nocturnal heat exposure during spermatogenesis to maintain optimal semen quality.
Humans
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Male
;
Semen Analysis
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Adult
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Sperm Motility
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Hot Temperature/adverse effects*
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China
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Middle Aged
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Spermatozoa/physiology*
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Young Adult
3.Application value of arthroscopic tunnel pulling and suturing in different types of lateral meniscus posterior root injuries
Jianlong NI ; Baoqing ZHANG ; Qiang LI ; Wengao LI
International Journal of Surgery 2025;52(3):156-163
Objective:To explore the application value of arthroscopic tunnel pulling and suturing methods in West type Ⅱ and Ⅲ lateral meniscus posterior root injuries.Methods:A total of 184 patients with West Ⅱ ( n=92) and Ⅲ ( n=92) lateral meniscus posterior root injuries who underwent surgical treatment in Second Affiliated Hospital of Xi′an Jiaotong University from May 2022 to June 2023 were selected as the study subjects, by adopting a retrospective controlled study method. Using a random number table method, West Ⅱ and Ⅲ patients were divided into a tunnel method group and a suture method group, with 46 patients in each group. There were 23 male and 23 female patients in the West Ⅱ tunnel method group, with an age of (48.36±2.52) years. There were 25 male and 21 female patients in the suture method group, with an age of (48.61±2.21) years. There were 24 male and 22 female patients in the West Ⅲ tunnel method group, with an age of (48.53±2.36) years. There were 24 male and 22 female patients in the suture method group, with an age of (46.38±2.67) years. The tunnel method group used arthroscopic tibial tunnel cable fixation method, while the suture method group used arthroscopic full internal meniscus suture method. Compared the surgical time, length of hospital stay, and first postoperative time of getting out of bed between the tunnel method group and the suture method group of patients with different subtypes. Compared the knee joint function scores (Lysholm, Tegner, IKDC, VAS) before and after surgery. Used MRI to examine the compression of the patient′s lateral meniscus. Compared the incidence of adverse reactions. Measurement data with normal distribution were represented as mean ± standard deviation( ± s), and the comparison between groups was conducted using the t-test; the comparison of count data were represented as [ n(%)] and was conducted by chi-square test or Fisher exact probability. The skewness data were expressed by M( Q1, Q3), and rank-sum test was used for inter-group comparison. Results:There was no significant difference in surgical time, length of hospital stay, and first postoperative bed time between the West type Ⅱ, Ⅲ tunel method group and the suture method group ( P>0.05). At 12 months after surgery, there was no statistically significant difference in the Lysholm score, Tegner score, IKDC score, and VAS score between the West Ⅱ type patients in the tunnel method group and the suture method group ( P>0.05). However, the Lysholm score and IKDC score in the West Ⅲ type tunnel method group were significantly higher than those in the suture method group, and the difference was statistically significant( P<0.05). However, there was no statistically significant difference in the Tegner score and VAS score ( P>0.05). At the 12th months after surgery, there was no statistically significant difference in the overall width of the meniscus between the tunnel method group and the suture method group for patients with different West classifications( P>0.05). However, the relative percentage of meniscus compression in the tunnel method group was significantly lower than that in the suture method group, and the difference was statistically significant ( P<0.05). There was no statistically significant difference in the incidence of postoperative complications between the tunnel method group and the suture method group in patients with different West subtypes ( P>0.05). Conclusions:The arthroscopic tibial tunnel wire fixation method is effective, safe, and reliable in treating patients with West Ⅱ and West Ⅲ lateral meniscus posterior root injuries promoting kneejoint function recovery. It is expected to become a high-quality treatment plan for patients with West Ⅱ and West Ⅲ meniscus injuries.
4.Incidence of venous thromboembolism in esophageal cancer: a real-world study of 8 458 cases
Kunyi DU ; Xin NIE ; Kexun LI ; Changding LI ; Kun LIU ; Zhiyu LI ; Kunzhi LI ; Simiao LU ; Kunhan NI ; Wenwu HE ; Chenghao WANG ; Jialong LI ; Haojun LI ; Qiang ZHOU ; Kangning WANG ; Guangyuan LIU ; Wenguang XIAO ; Qiang FANG ; Qiuling SHI ; Yongtao HAN ; Lin PENG ; Xuefeng LENG
Chinese Journal of Digestive Surgery 2024;23(1):109-113
Objective:To investigate the incidence of venous thromboembolism (VTE) in patients with esophageal cancer (EC).Methods:The retrospective cohort study was conducted. The clinicopathological data of 8 458 EC patients who were admitted to Sichuan Cancer Hospital from January 2017 to December 2021 were collected. There were 6 923 males and 1 535 females, aged (64±9)years. There were 3 187 patients undergoing surgical treatment, and 5 271 cases undergoing non-surgical treatment. Observation indicators: (1) incidence of VTE in EC patients; (2) treatment and outcomes of patients with VTE. Measurement data with normal distribution were represented as Mean± SD, and comparison between groups was analyzed using the t test. Measurement data with skewed distribution were represented as M(range), and comparison between groups was analyzed using the nonparameter rank sum test. Count data were expressed as absolute numbers or percentages, and comparison between groups was analyzed using the chi-square test or Fisher exact probability. Comparison of ordinal data was analyzed using the nonparameter rank sum test. Results:(1) Incidence of VTE in EC patients. Of 8 458 EC patients, 175 cases developed VTE, with an incidence rate of 2.069%(175/8 458). Among 175 VTE patients, there were 164 cases of deep venous thrombosis (DVT), 4 cases of pulmonary embolism (PE), 7 cases of DVT and PE. There were 59 surgical patients and 116 non-surgical patients. There was no significant difference in thrombus type between surgical and non-surgical EC patients with VTE ( χ2=1.95, P>0.05). Of 3 187 surgical patients, the incidence of VTE was 1.851%(59/3 187), including an incidence of 0.157%(5/3 187) of PE. PE accounted for 8.475%(5/59) of surgical patients with VTE. Of 5 271 non-surgical patients, the incidence of VTE was 2.201%(116/5 271), including an incidence of 0.114%(6/5 271) of PE. PE accounted for 5.172%(6/116) of non-surgical patients with VTE. There was no significant difference in the incidence of VTE or PE between surgical patients and non-surgical patients ( χ2=1.20, 0.05, P>0.05). (2) Treatment and outcomes of patients with VTE. Among 175 EC patients with VTE, 163 cases underwent drug treatment, and 12 cases did not receive treatment. Among 163 cases with drug therapy, 158 cases underwent anticoagulant therapy, 5 cases were treated with thrombolysis. All the 163 patients were improved and discharged from hospital. Conclusions:The incidence of VTE in patients with EC is relatively low, as 2.069%. There is no significant difference in the incidence of VTE or thrombus type between surgical EC patients and non-surgical EC patients.
5.Effects of Zhuangyao Shuanglu Tongnao Formula on neuronal apoptosis of rats with ischemia-reperfusion induced injury
Yang ZHAI ; Xue-Ni MO ; Hong-Li TENG ; Yue-Qiang HU ; Guang-Shan ZHENG ; Wei MA ; Peng YANG ; Xiao-Ping MEI ; Min ZOU ; Kai-Hua WANG
Chinese Traditional Patent Medicine 2024;46(3):795-802
AIM To investigate the effects of Zhuangyao Shuanglu Tongnao Formula on neuronal apoptosis in rats with cerebral ischemia-reperfusion injury based on the study of oxidative stress and inflammatory response.METHODS The rats were randomly divided into the sham operation group,the model group,the edaravone group(3.0 mg/kg),the low,medium and high dose groups(9.0,18.0,36.0 g/kg)of Zhuangyao Shuanglu Tongnao Formula,with 18 rats in each group.The middle cerebral artery occlusion/reperfusion was conducted by thread embolism method to simulate cerebral ischemia reperfusion injury in rats followed by 6 days corresponding drugs administration.Subsequently,the rats had their neurological function deficit scored by Zeal Longa scoring method;their sizes of cerebral infarction areas measured by TTC staining;their pathological damage and apoptosis of neurons in hippocampal CA1 area of ischemic penumbra of the brain tissue detected by HE staining and TUNEL staining;their SOD activity and levels of GSH,MDA,IL-6,IL-1β,TNF-α in brain tissue detected by kits;and their protein expressions of Bax,Bcl-2,caspase-3,cleaved-capase-3,TLR4,NF-κB p65,Nrf2,HO-1 in rat brain tissue determined by Western blot.RESULTS Compared with the model group,the groups intervened with edaravone,medium and high dose of Zhuangyao Shuanglu Tongnao Formula displayed improvements in the scores of nerve function defects,the rate of cerebral infarction,the rate of neuronal apoptosis,the levels of IL-6,IL-1β,TNF-α and MDA in the ischemic penumbra of brain tissues,the protein expressions of Bax and TLR4,the ratio of cleaved-capase-3/caspase-3 and p-NF-κB p65/NF-κB p65(P<0.05),the levels of GSH,the activity of SOD and the protein expressions of Bcl-2,Nrf2 and HO-1(P<0.05).CONCLUSION Being an inhibitor of oxidative stress and inflammatory response,Zhuangyao Shuanglu Tongnao Formula can alleviate brain injury in rats with cerebral ischemia reperfusion injury through the inhibition of neuronal apoptosis and improvement of neural function mediated by the inhibition of TLR4/NF-κB signal pathway and activation of Nrf2/HO-1 signal pathway.
6.Observation of the efficacy of Vonoprazan dual therapy in the eradication of Helicobacter pylori
Shi-Ling WANG ; Dan-Ni CHEN ; Zhao LIU ; Zhao-Li MA ; Qiang LI ; Hong LU ; Min LIU ; Xi GOU ; Jun WANG ; Xiao-Chuang SHU ; Qian REN
Modern Interventional Diagnosis and Treatment in Gastroenterology 2024;29(3):265-269
Objective This paper intends to compare the efficacy and safety of high-dose dual regimens containing Vonoprazan and proton pump inhibitor in patients infected with Helicobacter pylori(H.pylori).Methods A prospective randomized controlled study was conducted.According to inclusion and exclusion criteria.,243 patients with H.pylori infection admitted to the Department of Gastroenterology,the First Hospital of Lanzhou University from February 2023 to December 2023 were enrolled as the research objects.They were randomly divided into two groups.The high-dose dual therapy containing Vonoprazan group(VPZ-HDDT group)was given Vonoprazan fumarate tablet 20mg twice daily plus amoxicillin 750 mg four times daily for 14 days and the high-dose combination group containing PPI(PPI-HDDT group)was given esomeprazole 40 mg twice daily plus amoxicillin 750 mg four times daily for 14 days.Patients were followed up and recorded by telephone or WeChat on the 7th and 14th day of starting treatment for drug intake and occurrence of adverse reactions.Patients were instructed to recheck the 13C or 14C urea breath test at least 1 month after the end of medication.Treatment by protocol(PP)analysis,modified intention to treat(mITT)and intention-to-treat(ITT)analysis were used for H.pylori eradication rates in both groups,and compliance and incidence of adverse reactions were compared between the two groups.Results The eradication rates of the VPZ-HDDT group and the PPI-HDDT group in the initial treatment were 94.0%and 88.5%(P=0.209)by PP analysis,and 91.8%and 87.5%(P=0.358)86.7%by mITT analysis,and 81.9%(P=0.377)by ITT analysis,respectively.In the retreated patients,the PP analysis and mITT analysis eradication rates in these two groups were consistent,87.0%and 84.2%(P=0.800),respectively,and 83.3%and 76.2%(P=0.550)by ITT analysis.For the refractory H.pylori patients,the PP analysis and mITT analysis eradication rates in these two groups were also consistent,71.4%and 50.0%(P=0.429),and the eradication rates of ITT analysis were 62.5%and 50.0%(P=0.640),respectively.In different stratifications,the eradication rates of the VPZ-HDDT group were higher than those of the PPI-HDDT group,but the differences were not statistically significant.The incidence of adverse reactions and compliance of the VPZ-HDDT group and the PPI-HDDT group were similar,with no statistically significant differences.Conclusion Both two combination regimens can achieve clinically acceptable eradication rates(>85%)in the first-time treatment patients.For the retreated and refractory patients,the choice of vonoprazan is more beneficial.
7.Endoscopic resection of type D trigeminal schwannoma through nasal sinus approach.
Xin FENG ; Qiang FU ; Shao Wei GU ; Ping YE ; Juan WANG ; Chen DUAN ; Xiao Lan CAI ; Li Qiang ZHANG ; Shi Lei NI ; Xue Zhong LI
Chinese Journal of Surgery 2023;61(3):232-238
Objective: To examine the feasibility and surgical approach of removing type D trigeminal schwannoma through nasal cavity and nasal sinus under endoscope. Methods: Eleven patients with trigeminal schwannoma who were treated in the Department of Otorhinolaryngology, Qilu Hospital of Shandong University from December 2014 to August 2021 were analyzed retrospectively in this study. There were 7 males and 4 females, aged (47.5±13.5) years (range: 12 to 64 years). The neoplasm involved the pterygopalatine fossa, infratemporal fossa, ethmoidal sinus, sphenoid sinus, cavernous sinus, and middle cranial fossa. The size of tumors were between 1.6 cm×2.0 cm×2.0 cm and 5.7 cm×6.0 cm×6.0 cm. Under general anesthesia, the tumors were resected through the transpterygoid approach in 4 cases, through the prelacrimal recess approach in 4 cases, through the extended prelacrimal recess approach in 2 cases, and through the endoscopic medial maxillectomy approach in 1 case. The nasal endoscopy and imaging examination were conducted to detect whether neoplasm recurred or not, and the main clinical symptoms during follow-up. Results: All the surgical procedures were performed under endonasal endoscope, including Gross total resection in 10 patients. The tumor of a 12-year-old patient was not resected completely due to huge tumor size and limited operation space. One patient was accompanied by two other schwannomas located in the occipital region and the ipsilateral parotid gland region originating from the zygomatic branch of the facial nerve, both of which were removed concurrently. After tumor resection, the dura mater of middle cranial fossa was directly exposed in the nasal sinus in 2 cases, including 1 case accompanied by cerebrospinal fluid leakage which was reconstructed by a free mucosal flap obtained from the middle turbinate, the other case was packed by the autologous fat to protect the dura mater. The operation time was (M(IQR)) 180 (160) minutes (range: 120 to 485 minutes). No complications and deaths were observed. No recurrence was observed in the 10 patients with total tumor resection during a 58 (68) months' (range: 10 to 90 months) follow-up. No obvious change was observed in the facial appearance of all patients during the follow-up. Conclusion: Type D trigeminal schwannoma involving pterygopalatine fossa and infratemporal fossa can be removed safely through purely endoscopic endonasal approach by selecting the appropriate approach according to the size and involvement of the tumor.
Male
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Female
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Humans
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Child
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Retrospective Studies
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Endoscopy/methods*
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Nasal Cavity/surgery*
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Neurilemmoma/surgery*
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Cranial Nerve Neoplasms/surgery*
8.Preliminary study on thyroid ultrasound image restoration algorithm based on deep learning
Min ZHANG ; Chiming NI ; Jiaheng WEN ; Ziye DENG ; Haishan XU ; Haiya LOU ; Mei PAN ; Qiang LI ; Ling ZHOU ; Chuanju ZHANG ; Yu LING ; Jiaoni WANG ; Juanping CHEN ; Gaoang WANG ; Shiyan LI
Chinese Journal of Ultrasonography 2023;32(6):515-522
Objective:To explore the feasibility of deep learning-based restoration of obscured thyroid ultrasound images.Methods:A total of 358 images of thyroid nodules were retropectively collected from January 2020 to October 2021 at Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, and the images were randomly masked and restored using DeepFillv2. The difference in grey values between the images before and after restoration was compared, and 6 sonographers (2 chief physicians, 2 attending physicians, 2 residents) were invited to compare the rate of correctness of judgement and detection of image discrepancies. The ultrasound features of thyroid nodules (solid composition, microcalcifications, markedly hypoechoic, ill-defined or irregular margins, or extrathyroidal extensions, vertical orientation and comet-tail artifact) were extracted according to the Chinese Thyroid Imaging Reporting and Data System (C-TIRADS). The consistency of ultrasound features of thyroid nodules before and after restoration were compared.Results:The mean squared error of the images before and after restoration ranged from 0.274 to 0.522, and there were significant differences in the rate of correctness of judgement and detection of image discrepancies between physicians of different groups(all P<0.001). The overall accuracy rate was 51.95%, the overall detection rate was 1.79%, there were significant differences also within the chief physicians and resident groups (all P<0.001). The agreement rate of all ultrasound features of the nodules before and after image restoration was higher than 70%, over 90% agreement rate for features such as solid composition and comet-tail artifact. Conclusions:The algorithm can effectively repair obscured thyroid ultrasound images while preserving image features, which is expected to expand the deep learning image database, and promote the development of deep learning in the field of ultrasound images.
9.Surgical treatment and prognosis analysis of thoracic esophageal squamous cell carcinoma: a report of 2 766 cases
Kunhan NI ; Changding LI ; Longlin JIANG ; Wenwu HE ; Chenghao WANG ; Kangning WANG ; Guangyuan LIU ; Lin PENG ; Qiang FANG ; Wenguang XIAO ; Liang QIAO ; Qifeng WANG ; Yongtao HAN ; Xuefeng LENG
Chinese Journal of Digestive Surgery 2023;22(10):1199-1204
Objective:To investigate the surgical treatment and prognosis of thoracic esophageal squamous cell carcinoma (ESCC).Methods:The retrospective cohort study was conducted. The clinicopathological data of 2 766 patients with thoracic ESCC who were admitted to Sichuan Cancer Hospital & Institute from January 2010 to December 2017 were collected. There were 2 256 males and 510 females, aged (62±8)years. All patients underwent surgical treatment. Observation indicators: (1) treatment; (2) postoperative complications; (3) postoperative survival. Measurement data with normal distribution were represented as Mean± SD. Measurement data with skewed distribution were represented as M( Q1, Q3). Count data were described as absolute numbers or percentages. The Kaplan-Meier method was used to draw survival curve and calculate survival rate, and the Log-Rank test was used for survival analysis. Result:(1) Treatment. Fifty-two of the 2 766 patients underwent neoadjuvant therapy. There were 1 444 patients undergoing open surgery, including 44 cases conversion to thoracotomy, and there were 1 322 patients undergoing minimally invasive esophagectomy. There were 1 991, 729 and 46 cases with McKeown, Ivor-Lewis and Sweet esophagectomy, respectively. One thousand two hundred and seventy-one of the 2 766 patients underwent postoperative adjuvant therapy. The number of lymph node metastases, the number of lymph node dissected, rate of R 0 resection, operation time of 2 766 patients were 2.1(0,3.0), 22±12, 94.722%(2 620/2 766), (237±66)minutes. (2) Postoperative complications. The overall incidence of postoperative complications was 25.850%(715/2 766). The top two postoperative complications were pneumonia and anastomotic fistula, with incidence rates of 8.604%(238/2766) and 7.484%(207/2766), respectively. One patient may have more than two kinds of postoperative complications. (3) Postoperative survival. The 1-, 3-and 5-year overall survival rates of 2 766 patients were 86.2%, 57.5% and 46.8%, respectively. Further analysis indicated that the 5-year overall survival rates of 510 female patients and 2 256 male patients were 62.0% and 43.3%, respectively, showing a significant difference between them ( χ2=48.94, P<0.05). The 5-year overall survival rates of 693 cases with upper thoracic ESCC, 1 479 cases with middle thoracic ESCC and 594 cases with lower thoracic ESCC were 49.5%, 46.7% and 44.1%, respectively, showing no significant difference among them ( χ2=3.21, P>0.05). The 5-year overall survival rates of 68 cases with stage 0 thoracic ESCC, 259 cases with stage Ⅰ esophageal ESCC, 885 cases with stage Ⅱ thoracic ESCC, 1 222 cases with stage Ⅲ thoracic ESCC, and 332 cases with stage Ⅳ thoracic ESCC were 95.6%, 76.4%, 61.4%, 35.6%, and 14.5%, respectively, showing a significant difference among them ( χ2=500.40, P<0.05). The 5-year overall survival rates of 1 444 patients undergoing open esophagectomy and 1 322 patients undergoing minimally invasive esophagectomy were 42.5% and 51.8%, respectively, showing a significant difference between them ( χ2=31.29, P<0.05). The 5-year overall survival rates of 1 991 cases undergoing McKeown esophagectomy, 729 cases undergoing Ivor-Lewis esophagectomy, and 46 cases undergoing Sweet esophagectomy were 49.5%, 41.2%, and 32.3%, respectively, showing a significant difference among them ( χ2=19.19, P<0.05). Conclusions:Compared with open esophagectomy, minimally invasive esophagectomy brings survival benefits to patients with thoracic esophageal ESCC. Among different esophagectomy methods, the McKeown esophagectomy has also brought survival benefits to patients with esophageal ESCC compared to the Ivor-Lewis esophagectomy and the Sweet esophagectomy.
10.Investigation and analysis of CT dose to paediatric patients in Tianjin
Chunxu LIU ; Yan LIU ; Yang NI ; Zhen NIU ; Shoulong YANG ; Chunying LI ; Zhongqing DU ; Jimian ZHANG ; Qiang ZENG
Chinese Journal of Radiological Medicine and Protection 2023;43(12):997-1002
Objective:To study the level of CT dose to paediatric patients in Tianjin, and to provide basic data for establishing the diagnostic reference levels for paediatric patients from CT examinations in Tianjin.Methods:In 2022, a general survey was carried out of the CT doses to the head, chest, abdomen and pelvis of the scanned paediatric patients in two tertiary pediatric hospitals and seven tertiary general hospitals in Tianjin. The scanned pediatric patients were divided into four age groups in terms of the age of -1, -5, -10 and -15 years, and 20 patients were investigated in each age group in each hospital. The basic information were collected on the scanned patients, CT scanning parameters, volume CT dose index (CTDI vol), dose length product (DLP), and the differences in CTDI vol and DLP on the same site among different age groups and different types of hospitals were analyzed. Results:There were significant differences in CTDI vol and DLP between different age groups at the same site (head, chest, abdominal and pelvic, CTDI vol:χ2=296.51, 193.82, 291.72, P<0.001; DLP: χ2=291.22, 263.63, 344.97, P<0.001). There were significant differences in CTDI vol and DLP among different types of hospitals on the same site (head, chest, abdominal and pelvic, CTDI vol:Z=-13.13, -7.57, -15.27, P<0.001; DLP: Z=-9.07, -6.15, -11.57, P < 0.001). Conclusions:The 75 th percentile values of CTDI vol and DLP for pediatric head, chest, abdomen and pelvis CT scanning in tertiary hospitals in Tianjin are at a good level, and the dose on some examination sites are relatively high. Further optimization of pediatric CT scanning procedures is necessary.

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