1.Principles, technical specifications, and clinical application of lung watershed topography map 2.0: A thoracic surgery expert consensus (2024 version)
Wenzhao ZHONG ; Fan YANG ; Jian HU ; Fengwei TAN ; Xuening YANG ; Qiang PU ; Wei JIANG ; Deping ZHAO ; Hecheng LI ; Xiaolong YAN ; Lijie TAN ; Junqiang FAN ; Guibin QIAO ; Qiang NIE ; Mingqiang KANG ; Weibing WU ; Hao ZHANG ; Zhigang LI ; Zihao CHEN ; Shugeng GAO ; Yilong WU
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery 2025;32(02):141-152
With the widespread adoption of low-dose CT screening and the extensive application of high-resolution CT, the detection rate of sub-centimeter lung nodules has significantly increased. How to scientifically manage these nodules while avoiding overtreatment and diagnostic delays has become an important clinical issue. Among them, lung nodules with a consolidation tumor ratio less than 0.25, dominated by ground-glass shadows, are particularly worthy of attention. The therapeutic challenge for this group is how to achieve precise and complete resection of nodules during surgery while maximizing the preservation of the patient's lung function. The "watershed topography map" is a new technology based on big data and artificial intelligence algorithms. This method uses Dicom data from conventional dose CT scans, combined with microscopic (22-24 levels) capillary network anatomical watershed features, to generate high-precision simulated natural segmentation planes of lung sub-segments through specific textures and forms. This technology forms fluorescent watershed boundaries on the lung surface, which highly fit the actual lung anatomical structure. By analyzing the adjacent relationship between the nodule and the watershed boundary, real-time, visually accurate positioning of the nodule can be achieved. This innovative technology provides a new solution for the intraoperative positioning and resection of lung nodules. This consensus was led by four major domestic societies, jointly with expert teams in related fields, oriented to clinical practical needs, referring to domestic and foreign guidelines and consensus, and finally formed after multiple rounds of consultation, discussion, and voting. The main content covers the theoretical basis of the "watershed topography map" technology, indications, operation procedures, surgical planning details, and postoperative evaluation standards, aiming to provide scientific guidance and exploration directions for clinical peers who are currently or plan to carry out lung nodule resection using the fluorescent microscope watershed analysis method.
2.2024 Expert Consensus on Hospital Acquired Infection Control Principles in the Department of Critical Care Medicine
Wenzhao CHAI ; Jingjing LIU ; Xiaoting WANG ; Xiaojun MA ; Bo TANG ; Qing ZHANG ; Bin WANG ; Xiaomeng WANG ; Shihong ZHU ; Wenjin CHEN ; Zujun CHEN ; Quanhui YANG ; Rongli YANG ; Xin DING ; Hua ZHAO ; Wei CHENG ; Jun DUNA ; Jingli GAO ; Dawei LIU
Medical Journal of Peking Union Medical College Hospital 2024;15(3):522-531
Critically ill patients are at high risk for hospital acquired infections, which can significantly increase the mortality rate and treatment costs for these patients. Therefore, in the process of treating the primary disease, strict prevention and control of new hospital infections is an essential component of the treatment for critically ill patients. The treatment of critically ill patients involves multiple steps and requires a concerted effort from various aspects such as theory, management, education, standards, and supervision to achieve effective prevention and control of hospital infections. However, there is currently a lack of unified understanding and standards for hospital infection prevention and control. To address this, in March 2024, a group of experts in critical care medicine, infectious diseases, and hospital infection from China discussed the current situation and issues of hospital infection control in the intensive care unit together. Based on a review of the latest evidence-based medical evidence from both domestic and international sources,
3.Effect and Mechanism of Nongsuo Dangguiwan in Relieving Oxidative Stress in Premature Ovarian Insufficiency Rats Based on Nrf2/HO-1 Signaling Pathway
Jiaqi LUO ; Xiaoli DU ; Dongmei CHEN ; Miao CHEN ; Na HU ; Shasha XING ; Wenzhao LIU ; Ruiying TIAN ; Li YANG ; Jing WANG ; Rui HE ; Huiming MA
Chinese Journal of Experimental Traditional Medical Formulae 2023;29(13):1-9
ObjectiveTo investigate the effect and mechanism of Nongsuo Dangguiwan in improving ovarian oxidative stress in rats with ovarian dysfunction. MethodThirty-six adult female SD rats were randomly divided into normal group, model group, positive drug group (Femoston, 0.3 mg·kg-1), and high-, medium-, and low-dose groups of concentrated Nongsuo Dangguiwan (2.08, 4.16, 8.32 g·kg-1), with six rats in each group. Rats, except for those in the normal group, were injected with 80 mg·kg-1 vinyl cyclohexene dioxide (VCD) per day for 14 consecutive days to induce ovarian dysfunction. From the 15th day, rats were treated with corresponding drugs by gavage, while those in the model group received 2 mL·kg-1 saline, once daily for 28 consecutive days. The ovarian index, levels of related hormones including estradiol (E2), follicle-stimulating hormone (FSH), luteinizing hormone (LH), and anti-mullerian hormone (AMH) in serum, as well as superoxide dismutase (SOD) activity and glutathione (GSH) content in serum were measured by enzyme-linked immunosorbent assay (ELISA). The malondialdehyde (MDA) content in serum was detected by the thiobarbituric acid (TAB) method. Ovarian morphology was observed by hematoxylin-eosin (HE) staining. The expression of nuclear factor E2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), SOD2, and SOD1 in ovarian tissues was detected by immunohistochemistry (IHC) and Western blot. ResultCompared with the normal group, the model group showed a significant reduction in growing follicles in the ovary, loose arrangement of granulosa cells in the follicle, decreased body weight, ovarian index, and serum AMH and E2 levels, increased LH and FSH levels (P<0.01), reduced levels of SOD and GSH in serum (P<0.01), and increased MDA level (P<0.01). Compared with the model group, the groups with drug intervention showed increased ovarian index (P<0.05, P<0.01), increased serum E2 level (P<0.05, P<0.01), decreased FSH, AMH, and LH levels (P<0.05, P<0.01), increased number of growing follicles in the ovary, potentiated SOD activity in serum, increased GSH content, decreased MDA content (P<0.05, P<0.01), and up-regulated expression levels of Nrf2, HO-1, SOD2, and SOD1 proteins in ovarian tissues (P<0.05, P<0.01). ConclusionNongsuo Dangguiwan can regulate serum hormone levels, increase the expression of Nrf2, HO-1, SOD2, and SOD1 in ovarian tissues, and improve ovarian antioxidant capacity to resist oxidative stress injury, thereby improving ovarian reserve function.
4.Effect of Jianpi Yishen Huazhuo Prescription on Ovarian Function in Rats with Polycystic Ovary Syndrome Based on NLRP3 Inflammatory Pathway
Miao CHEN ; Xiaoli DU ; Yahong FENG ; Xiaojing ZHANG ; Jiaqi LUO ; Jing WANG ; Nan NAN ; Wenzhao LIU ; Shasha XING ; Ruiying TIAN ; Li YANG ; Miao SUN ; Rui HE ; Dongmei CHEN ; Huiming MA
Chinese Journal of Experimental Traditional Medical Formulae 2022;28(20):61-70
ObjectiveTo explore the mechanism of Jianpi Yishen Huazhuo prescription in the improvement of ovarian function in polycystic ovary syndrome (PCOS). MethodSeventy female SD rats in SPF grade were randomly divided into 6 groups, 15 in the blank group and 15 in the model group, 10 in the metformin group (0.1 g·kg-1·d-1), and 10 in the low (1.275 g·kg-1·d-1), medium (2.55 g·kg-1·d-1), and high-dose (5.10 g·kg-1·d-1) Jianpi Yishen Huazhuo prescription groups. The blank group was given normal saline (10 mL·kg-1·d-1) by gavage and ordinary feed, and the other groups were given letrozole (1 mg·kg-1·d-1) by gavage combined with high-fat feed for 21 days to induce the model of PCOS. After modeling, the blank group and model group were given equal volume normal saline by gavage, and each drug group was given the corresponding dose of the drug by gavage for 30 days. The changes in body mass and fasting blood glucose (FPG) of rats before and after modeling were compared. Hematoxylin eosin (HE) staining was used to observe the morphological change in the ovaries of rats in each group. The serum levels of follicle stimulating hormone (FSH), luteinizing hormone (LH), testosterone (T), anti-Mullerian hormone (AMH), and estradiol (E2) were measured by enzyme-linked immunosorbent assay (ELISA), and the LH/FSH ratio was calculated. Immunohistochemical staining (IHC) and Western blot were used to detect the protein expression levels of nucleoside binding oligomerization domain protein like receptor 3 (NALP3), apoptosis-associated speck-like protein (ASC), cysteine protease-1 (Caspase-1), nuclear transcription factor-κB (NF-κB), interleukin-1β (IL-1β), interleukin-18 (IL-18), and interleukin-6 (IL-6) in the rat ovaries. ResultAs compared with the blank group, large follicles with polycystic expansion were found in the ovaries of the model group, no dominant follicles were found, the granular layer of follicles decreased and arranged loosely, and the number of corpus luteum decreased significantly. Serum T, LH, AMH and LH/FSH increased in the model group (P<0.05, P<0.01), while FSH and E2 decreased (P<0.05, P<0.01). The relative protein expression levels of NALP3, ASC, Caspase-1, NF-κB, IL-1β, IL-18, and IL-6 increased (P<0.05, P<0.01) in the ovaries of the model group. Compared with the model group, the low, medium, and high-dose Jianpi Yishen Huazhuo prescription groups and the metformin group showed growing follicles and corpus luteum at all levels, the number of cystic expanding follicles decreased, the thickness of follicular granular layer increased, the number of follicular fluid increased, mature follicles were visible, and the local morphology of oocytes was complete. Serum T, LH, AMH, and LH/FSH in these groups decreased (P<0.05, P<0.01), while E2 and FSH increased (P<0.05). The relative protein expressions of NALP3, ASC, Caspase-1, NF-κB, IL-1β, IL-18, and IL-6 in the ovaries of these groups decreased (P<0.05, P<0.01). There was no significant difference among the treatment groups. ConclusionBy inhibiting the activation of NLRP3 inflammasome, Jianpi Yishen Huazhuo prescription reduces the release of NALP3, ASC, Caspase-1, NF-κB, IL-18, IL-1β, and IL-6 inflammatory factors in ovarian tissues, regulates endocrine level, and effectively reduces PCOS inflammatory statu, so as to play a role in improving ovarian function.
5.Progress in qualitative study on mental health service demand of children and adolescents with adverse childhood experiences.
Ping MAO ; Nannan LONG ; Wenzhao XIE ; Fang YAN ; Yang CHEN ; Lianhua PENG
Journal of Central South University(Medical Sciences) 2022;47(8):1163-1170
As a global public health problem, adverse childhood experiences (ACEs) is an important factor leading to serious psychological and behavioral problems in children and adolescents. Mental health service plan based on mental health service needs is the key to effectively improve the psychological problems of children and adolescents with ACEs. Emotional support, life skills training, mental health education, and individualized psychological intervention can effectively improve the mental health of children and adolescents with ACEs. Among them, emotional support is an important way to help individual reduce psychological and behavioral problems; secondly, life skills training can significantly improve the individual's psychosocial ability; and mental health education is a necessary way to promote the development of individual mental health. Individualized psychological intervention can promote individual to obtain more professional mental health service and improve their psychological symptoms, which is crucial for preventing the occurrence of mental health problems. Future research can develop targeted mental health interventions based on the specific mental health service needs.
Adolescent
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Adverse Childhood Experiences
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Child
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Humans
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Mental Health
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Mental Health Services
6.Clinical Recommendations for Perioperative Immunotherapy-induced Adverse Events in Patients with Non-small Cell Lung Cancer.
Jun NI ; Miao HUANG ; Li ZHANG ; Nan WU ; Chunxue BAI ; Liang'an CHEN ; Jun LIANG ; Qian LIU ; Jie WANG ; Yilong WU ; Fengchun ZHANG ; Shuyang ZHANG ; Chun CHEN ; Jun CHEN ; Wentao FANG ; Shugeng GAO ; Jian HU ; Tao JIANG ; Shanqing LI ; Hecheng LI ; Yongde LIAO ; Yang LIU ; Deruo LIU ; Hongxu LIU ; Jianyang LIU ; Lunxu LIU ; Mengzhao WANG ; Changli WANG ; Fan YANG ; Yue YANG ; Lanjun ZHANG ; Xiuyi ZHI ; Wenzhao ZHONG ; Yuzhou GUAN ; Xiaoxiao GUO ; Chunxia HE ; Shaolei LI ; Yue LI ; Naixin LIANG ; Fangliang LU ; Chao LV ; Wei LV ; Xiaoyan SI ; Fengwei TAN ; Hanping WANG ; Jiangshan WANG ; Shi YAN ; Huaxia YANG ; Huijuan ZHU ; Junling ZHUANG ; Minglei ZHUO
Chinese Journal of Lung Cancer 2021;24(3):141-160
BACKGROUND:
Perioperative treatment has become an increasingly important aspect of the management of patients with non-small cell lung cancer (NSCLC). Small-scale clinical studies performed in recent years have shown improvements in the major pathological remission rate after neoadjuvant therapy, suggesting that it will soon become an important part of NSCLC treatment. Nevertheless, neoadjuvant immunotherapy may be accompanied by serious adverse reactions that lead to delay or cancelation of surgery, additional illness, and even death, and have therefore attracted much attention. The purpose of the clinical recommendations is to form a diagnosis and treatment plan suitable for the current domestic medical situation for the immune-related adverse event (irAE).
METHODS:
This recommendation is composed of experts in thoracic surgery, oncologists, thoracic medicine and irAE related departments (gastroenterology, respirology, cardiology, infectious medicine, hematology, endocrinology, rheumatology, neurology, dermatology, emergency section) to jointly complete the formulation. Experts make full reference to the irAE guidelines, large-scale clinical research data published by thoracic surgery, and the clinical experience of domestic doctors and publicly published cases, and repeated discussions in multiple disciplines to form this recommendation for perioperative irAE.
RESULTS:
This clinical recommendation covers the whole process of prevention, evaluation, examination, treatment and monitoring related to irAE, so as to guide the clinical work comprehensively and effectively.
CONCLUSIONS
Perioperative irAE management is an important part of immune perioperative treatment of lung cancer. With the continuous development of immune perioperative treatment, more research is needed in the future to optimize the diagnosis and treatment of perioperative irAE.
7.Clinical application of different bladder neck separation techniques in robot-assisted laparoscopic radical prostatectomy
Shida FAN ; Shangqing REN ; Fang ZHOU ; Zhengjun CHEN ; Wenzhao YANG ; Qian LYU ; An LI ; Hualin FENG ; Qiang WANG ; Yu NIE ; Dong WANG
Chinese Journal of Urology 2020;41(3):194-199
Objective:To investigate the clinical effect of different bladder neck separation methods in robot-assisted laparoscopic radical prostatectomy (RARP).Methods:To retrospective analysis the data of robot-assisted laparoscopic radical prostatectomy (RARP)in our center from October, 2014 to October, 2018. All operations were performed by the same urologist. According to the different methods of bladder neck separationAccording to the different methods of bladder neck separation, all the patients were divided into four groups. Group A routine forward peeling method (500 cases): Make a 1cm incision at 12 o'clock on the front of the bladder neck, cut off the detrusor muscle and cut the bladder neck. Group B T-cut incision of the bladder neck (133 cases): identify the bladder and prostate Junction, T-shaped incision of the anterior wall of the bladder neck. Group C conventional stripping method combined with T-shaped incision of the bladder neck (81 cases). Group D lateral approach (36 cases): along the lateral side of the bladder neck and the medial posterior ligament of the prostate is separated and merges with the previously established Dirichlet space. The general data of patients were analyzed statistically.The average ages of groups A, B, C, and D were 63 years (62.5 to 67 years), 65 years (61 to 68 years), 66 years (64.5 to 70.5 years), and 62 years (59.5 to 66.5 years)respectively, there was no statistical significance difference in terms of age in 4 groups( P>0.05); PSA is 13 ng/ml(9.0 to 22 ng/ml), 7.4 ng/ml(6.4 to 26.0 ng/ml), 6.2 ng/ml(5.3 to 27.0 ng/ml), 14ng/ml(8.4 to 21.0 ng/ml), ( P>0.05); Gleason scores of puncture were 6.9(5 to 9), 7(6 to 12), 9(8 to 16), 10(6 to 18), ( P>0.05); the prostate volume was 66ml(42 to 78 ml), 70ml(50 to 89 ml), 53ml (43 to 72 ml), 80 ml (68 to 92 ml), ( P>0.05); the proportions of body mass index ≤25 kg/m 2 were 60.0%, 63.9%, 39.1%, 42.0%, and>25 kg/m 2 were 40%, 36.1%, 60.9%, and 58.0%, respectively, ( P>0.05). The operation time, bleeding volume, anastomosis time, postoperative hospital stay, postoperative complications, positive rate of proximal incision margin, urinary indwelling time, and urinary control rate in the four groups analyzed. Results:All 750 RARP operations were successful, and none were converted to open.The operation time of groups A, B, C, and D were 100 min(70 to 120 min), 89 min(70 to 95 min), 105 min(80 to 127 min), and 110 min(90 to 130 min), ( P>0.05); anastomosis time was 20.5 min (18.0 to 25.0 min)、16.1min (10.7 to 17.3 min)、25.4 min (18.9 to 27.0 min)、and 28.5 min (21.0 to 32.0 min), the anastomosis time in group B was significantly shorter than other groups ( P<0.05); the postoperative hospital stays were 9.3 days (8.0 to 13.0 days), 8.4 days (6.0 to 16.0 days), 10.8 days (8.0 to 16.0 days)and 7.8 days (7.0 to 14.0 days), ( P>0.05). Postoperative complications: Anastomotic fistula and ureteral injury occurred in 3 cases in group A, and no serious complications occurred in the other 3 groups. Proximal marginal positive rate: 40 cases (8.0%) in group A, 0 cases in group B, 6 cases (7.3%) in group C, 3 cases (8.3%) in group D, and low positive rate of margin incision in group B( P<0.05). The urinary indwelling time was 7 d (6 to 8 d), 6 d(4 to 8 d), 12 d(6 to 18 d), 10 d(6 to 13 d), ( P>0.05). Six-month postoperative urine control rate: 381 cases (75.2%) in group A, 102 cases (76.9%) in group B, 61 (75.4%) in group C, and 27 (73.8%) in group D, ( P>0.05). Conclusions:The above four method of bladder neck separation during robot-assisted laparoscopic radical prostatectomy is safe and feasible, which can effectively avoid ureteral damage. Each method can obtain better urine control within six months after surgery rate. The positive rate of proximal incision margin after T-shaped bladder neck was lowest among four groups.
8.Experts consensus on the management of delirium in critically ill patients
Bo TANG ; Xiaoting WANG ; Wenjin CHEN ; Shihong ZHU ; Yangong CHAO ; Bo ZHU ; Wei HE ; Bin WANG ; Fangfang CAO ; Yijun LIU ; Xiaojing FAN ; Hong YANG ; Qianghong XU ; Heng ZHANG ; Ruichen GONG ; Wenzhao CHAI ; Hongmin ZHANG ; Guangzhi SHI ; Lihong LI ; Qibing HUANG ; Lina ZHANG ; Wanhong YIN ; Xiuling SHANG ; Xiaomeng WANG ; Fang TIAN ; Lixia LIU ; Ran ZHU ; Jun WU ; Yaqiu WU ; Chunling LI ; Yuan ZONG ; Juntao HU ; Jiao LIU ; Qian ZHAI ; Lijing DENG ; Yiyun DENG ; Dawei LIU
Chinese Journal of Internal Medicine 2019;58(2):108-118
To establish the experts consensus on the management of delirium in critically ill patients.A special committee was set up by 15 experts from the Chinese Critical Hypothermia-Sedation Therapy Study Group.Each statement was assessed based on the GRADE (Grading of Recommendations Assessment,Development,and Evaluation) principle.Then the Delphi method was adopted by 36 experts to reassess all the statements.(1) Delirium is not only a mental change,but also a clinical syndrome with multiple pathophysiological changes.(2) Delirium is a form of disturbance of consciousness and a manifestation of abnormal brain function.(3) Pain is a common cause of delirium in critically ill patients.Analgesia can reduce the occurrence and development of delirium.(4) Anxiety or depression are important factors for delirium in critically ill patients.(5) The correlation between sedative and analgesic drugs and delirium is uncertain.(6) Pay attention to the relationship between delirium and withdrawal reactions.(7) Pay attention to the relationship between delirium and drug dependence/ withdrawal reactions.(8) Sleep disruption can induce delirium.(9) We should be vigilant against potential risk factors for persistent or recurrent delirium.(10) Critically illness related delirium can affect the diagnosis and treatment of primary diseases,and can also be alleviated with the improvement of primary diseases.(11) Acute change of consciousness and attention deficit are necessary for delirium diagnosis.(12) The combined assessment of confusion assessment method for the intensive care unit and intensive care delirium screening checklist can improve the sensitivity of delirium,especially subclinical delirium.(13) Early identification and intervention of subclinical delirium can reduce its risk of clinical delirium.(14) Daily assessment is helpful for early detection of delirium.(15) Hopoactive delirium and mixed delirium are common and should be emphasized.(16) Delirium may be accompanied by changes in electroencephalogram.Bedside electroencephalogram monitoring should be used in the ICU if conditions warrant.(17) Pay attention to differential diagnosis of delirium and dementia/depression.(18) Pay attention to the role of rapid delirium screening method in delirium management.(19) Assessment of the severity of delirium is an essential part of the diagnosis of delirium.(20) The key to the management of delirium is etiological treatment.(21) Improving environmental factors and making patient comfort can help reduce delirium.(22) Early exercise can reduce the incidence of delirium and shorten the duration of delirium.(23) Communication with patients should be emphasized and strengthened.Family members participation can help reduce the incidence of delirium and promote the recovery of delirium.(24) Pay attention to the role of sleep management in the prevention and treatment of delirium.(25) Dexmedetomidine can shorten the duration of hyperactive delirium or prevent delirium.(26) When using antipsychotics to treat delirium,we should be alert to its effect on the heart rhythm.(27) Delirium management should pay attention to brain functional exercise.(28) Compared with non-critically illness related delirium,the relief of critically illness related delirium will not accomplished at one stroke.(29) Multiple management strategies such as ABCDEF,eCASH and ESCAPE are helpful to prevent and treat delirium and improve the prognosis of critically ill patients.(30) Shortening the duration of delirium can reduce the occurrence of long-term cognitive impairment.(31) Multidisciplinary cooperation and continuous quality improvement can improve delirium management.Consensus can promote delirium management in critically ill patients,optimize analgesia and sedation therapy,and even affect prognosis.
9.Feasibility analysis based on BI evaluation index of SCI journals :Taking the Third Xiangya Hospital as an example
Qingyuan HU ; Wenzhao XIE ; Guoping YANG
Chinese Journal of Medical Science Research Management 2019;32(5):386-391
Objective This paper selects indicators,such as SCI journal publication fee,impact factors,annual Web of Science Documents,volume of publications in China,articles cited and so on,to conduct the feasibility analysis of using publication fee /impact factor (BI) as evaluation index of SCI journals.Methods Information from Web of Science,InCites,Journal Citation Reports database and the real-time data of 2013-2017 years SCI publication fees in Central South University,the third Xiangya Hospital were collected,SPSS and EXCEL was used to conduct Correlation and Basic analysis.Results In 2013-2017,a total number of 31 kinds of SCI journals were included in sample size,the SCI journal impact factor was positively correlated with the publication fee.BI was negative correlated with IF,The publication fee was not related to annual Web of Science Documents,volume of publications in Mainland China and Cites/Paper.Conclusions The SCI journal publication fee/impact factor (BI) can be used as a macro evaluation index for SCI journals.The BI values also can provide reference and reference of decision support and journal selection for scientific research personnel and scientific research administrators.
10. Interobserver variations in the delineation of planning target volume and with orgagans at risk different contouring methods in intensity-modulated radiation therapy for nasopharyngeal carcinoma
Yinglin PENG ; Wenzhao SUN ; Wanqin CHENG ; Haiqun XIA ; Jijin YAO ; Weiwei XIAO ; Guanzhu SHEN ; Lin YANG ; Shu ZHOU ; Jiaxin LI ; Ying GUAN ; Shuai LIU ; Xiaowu DENG
Chinese Journal of Radiation Oncology 2019;28(10):762-766
Objective:
To assess the interobserver variations in delineating the planning target volume (PTV) and organs at risk (OAR) using different contouring methods during intensity-modulated radiation therapy (IMRT) for nasopharyngeal carcinoma (NPC), aiming to provide references for the quality control of multi-center clinical trials.
Methods:
The PTV and OAR of CT image of 1 NPC patient manually delineated by 10 physicians from 8 different radiation centers were defined as the " manual contour group" , and the OAR auto-contoured using the ABAS software and modified by the physicians were defined as the " auto+ manual contour group" . The maximum/minimum ratio (MMR) of the PTV and OAR volumes, and the coefficient of variation (CV) for different delineated contours were comparatively evaluated.
Results:
Large variation was observed in the PTV and OAR volumes in the manual contour group. The MMR and CV of the PTV were 1.72-3.41 and 0.16-0.39, with the most significant variation in the PTVnd (MMR=3.41 and CV=0.39 for the PTVnd-L). The MMR and CV of the manually contoured OAR were 1.30-7.89 and 0.07-0.67. The MMR of the temporal lobe, spinal cord, temporomandibular joint, optic nerve and pituitary gland exceeded 2.0. Compared with the manual contour group, the average contouring time in the auto+ manual group was shortened by 68% and the interobserver variation of the OAR volume was reduced with an MMR of 1.04-2.44 and CV of 0.01-0.37.
Conclusions
Large variation may occur in the PTV and OAR contours during IMRT plans for NPC delineated by different clinicians from multiple medical centers. Auto-contouring+ manually modification can reduce the interobserver variation of OAR delineation, whereas the variation in the delineation of small organs remains above 1.5 times. The consistency of the PTV and OAR delineation and the possible impact upon clinical outcomes should be reviewed and evaluated in multi-center clinical trials.

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