deep

  • 文章类型: Journal Article
    法医精神病患者的动机低和认知技能欠佳是常见的。通过专注于做和体验,创新技术可以为该患者组提供现有治疗的替代方案.一种有前途的技术是DEEP,一个教膈呼吸的VR生物反馈游戏,这表明了它在减轻其他人群压力方面的潜力。这项探索性研究旨在确定,Deep如何以及对谁来说可以在法医精神保健中具有附加值。
    这项研究采用了定性方法。在两个荷兰法医精神保健组织中,对24名医疗保健提供者进行了六个焦点小组,并对13名法医精神病住院患者进行了半结构化访谈。所有医疗保健提供者和患者在参与之前都经历了深度。数据是感应编码的,采用常数比较的方法。
    数据揭示了六个主题,并附有(子)代码,包括(1)DEEP的可能优点和(2)缺点,(3)可能使DEEP更多或(4)不太适合和有益的患者特征,(5)DEEP可用于目前的治疗方法,(6)在法医精神保健中成功实施DEEP需要满足的条件。结果表明,DEEP可以提供新的方法来支持法医精神病患者通过练习diaphragm呼吸来应对负面情绪。其吸引人的设计可能适合激发广泛的法医精神病患者群体。然而,深度不能个性化,这可能会降低长期深度的参与和吸收。关于它在当前护理中的地位,DEEP可以在结构上整合到现有的治疗方案中,或者在需要时临时使用。最后,这项研究表明,医疗保健提供者和患者都需要实际支持和信息才能使用DEEP.
    凭借其基于经验和游戏化的设计,DEEP可能对法医精神保健有用。建议从一开始就将患者和医疗保健提供者纳入评估和实施中。此外,应采用多层次的方法来制定实施战略。如果执行得当,DEEP可以提供新的方法,为法医精神病患者提供应对策略,以更好地控制他们的愤怒。
    UNASSIGNED: Low motivation and suboptimal cognitive skills are common among forensic psychiatric patients. By focusing on doing and experiencing, innovative technologies could offer an alternative to existing treatment for this patient group. One promising technology is DEEP, a VR biofeedback game that teaches diaphragmatic breathing, which has shown its potential in reducing stress in other populations. This exploratory study aimed at identifying if, how and for whom DEEP can be of added value in forensic mental healthcare.
    UNASSIGNED: This study used a qualitative approach. Six focus groups with 24 healthcare providers and 13 semi-structured interviews with forensic psychiatric inpatients were conducted in two Dutch forensic mental healthcare organizations. All healthcare providers and patients experienced DEEP before participating. The data were coded inductively, using the method of constant comparison.
    UNASSIGNED: The data revealed six themes with accompanying (sub)codes, including (1) the possible advantages and (2) disadvantages of DEEP, (3) patient characteristics that could make DEEP more or (4) less suitable and beneficial, (5) ways DEEP could be used in current treatment, and (6) conditions that need to be met to successfully implement DEEP in forensic mental healthcare. The results showed that DEEP can offer novel ways to support forensic psychiatric patients in coping with negative emotions by practicing diaphragmatic breathing. Its appealing design might be suitable to motivate a broad range of forensic psychiatric patient groups. However, DEEP cannot be personalized, which might decrease engagement and uptake of DEEP long-term. Regarding its place in current care, DEEP could be structurally integrated in existing treatment programs or used ad hoc when the need arises. Finally, this study showed that both healthcare providers and patients would need practical support and information to use DEEP.
    UNASSIGNED: With its experience-based and gamified design, DEEP could be useful for forensic mental healthcare. It is recommended that patients and healthcare providers are included in the evaluation and implementation from the start. Besides, a multilevel approach should be used for formulating implementation strategies. If implemented well, DEEP can offer new ways to provide forensic psychiatric patients with coping strategies to better control their anger.
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  • 文章类型: Journal Article
    内窥镜程序通常应用于癌症筛查程序和监测。优选的技术通常是深度镇静,丙泊酚是一种方便的药剂,允许更快的患者恢复,同时与传统药剂相比保持类似的安全性。然而,不良事件,包括呼吸抑制和随之而来的不良心血管副作用,可能发生。这项工作的目的是评估在深度丙泊酚镇静下在内窥镜手术期间添加二氧化碳描记对患者安全的影响。数据是回顾性收集的患者接受深,2019年10月至2021年1月在一家土耳其大学医院进行胃肠道(GI)内窥镜检查的程序性镇静。分析中包括美国麻醉医师协会(ASA)分类为I-IV的所有成年患者,计划使用异丙酚单独或联合进行胃肠道内窥镜检查的患者。收集了1840名患者的数据,其中1610人(730人实施二氧化碳监测前和880人实施后)符合纳入标准。主要结果是轻度氧饱和度的复合发生率的变化(SpO275-90%<60s),严重的氧饱和度(SpO2<75%随时或<90%>60s),心动过缓(<60ppm),和心动过速(基线>25%)。没有二氧化碳描记术,平均而言,每100例手术中观察到7.5例主要终点事件,另外进行二氧化碳监测时观察到2.9例(p<0.001)。轻度氧饱和度明显降低,结果比值比为0.25(95%CI0.14至0.46)。ASAI患者的任何氧饱和度降低的综合发生率差异最大,在二氧化碳描记术前组为5.85%,在二氧化碳描记术后组为0.64%。尽管使用异丙酚的程序性镇静与严重不良事件无关,增加二氧化碳监测可以降低复合不良事件的发生率.
    Endoscopic procedures are routinely applied to cancer screening programs and surveillance. The preferred technique is usually deep sedation with propofol being a convenient agent allowing for a quicker patient recovery while maintaining a similar safety profile compared to traditional agents. However, adverse events, including respiratory depression and consequent undesirable cardiovascular side effects, may occur. The goal of this work is to evaluate the patient safety impact of adding capnography during endoscopic procedures under deep propofol sedation. Data were retrospectively collected from patients undergoing deep, procedural sedation for gastrointestinal (GI) endoscopy in October 2019 to January 2021 in a single Turkish university hospital. Included in the analysis were all adult patients classified by the American Society of Anesthesiologists (ASA) as I-IV, who were scheduled for GI endoscopy utilizing propofol alone or in combination. Data on 1840 patients were collected, of whom 1610 (730 pre- and 880 post-capnography implemention) met inclusion criteria. The primary outcome was a change in the composite incidence of mild oxygen desaturation (SpO2 75-90% for <60 s), severe oxygen desaturation (SpO2 < 75% anytime or <90% for >60 s), bradycardia (<60 ppm), and tachycardia (>25% from baseline). Without capnography, on average, 7.5 events of the primary endpoint were observed per 100 procedures and 2.9 with additional capnography monitoring (p < 0.001). A significant reduction was observed for mild oxygen desaturation, with a resulting odds ratio of 0.25 (95% CI 0.14 to 0.46). ASA I patients had the highest difference in combined incidence of any oxygen desaturation of 5.85% in the pre-capnography group and 0.64% in the post-capnography group. Although procedural sedation using propofol is not associated with severe adverse events, the incidence of composite adverse events could be reduced with the addition of capnography monitoring.
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  • 文章类型: Journal Article
    人体内的进行性器官水平疾病通常与其他身体部位的疾病相关。例如,肝脏疾病可能与心脏问题有关,而癌症可能与脑部疾病(或心理状况)有关。定义这种相关性是一项复杂的任务,而执行此任务的现有深度学习模型在应用于实时场景时,要么表现出较低的准确性,要么不全面。为了克服这些问题,本文提出了通过异构相关身体器官分析的基于增强生物启发深度学习的多域身体参数分析的设计。所提出的模型最初收集不同身体部位的时间和空间数据扫描,并使用多域特征提取引擎将这些扫描转换为向量集。这些载体由细菌觅食优化器(BFO)处理,这有助于识别高度变异的特征集,它们分别分为不同的疾病类别。盗梦网络的融合,XCceptionNet,和GoogLeNet模型用于执行这些分类。分类的类别通过血液报告的时间分析与其他疾病类型相关联。时间分析引擎使用改进的分析层次处理(MAHP)模型来计算器官间疾病依赖概率。基于这些概率,该模型能够生成患者水平的相关图,临床专家可以用它来建议补救治疗,因此,该模型能够识别脑部疾病和肾脏之间的相关性,心脏病和肺部疾病,心脏病和肝脏疾病,在临床情景下评估时,脑部疾病和不同类型的癌症具有很高的效率。在MITBIH上验证时,DEAP,肾脏CT,RIDER,和PLCO数据样本,观察到所提出的模型能够将相关性的准确性提高8.5%,与类似临床情景下的现有相关模型相比,准确率和召回率提高了3.2%。
    Progressive organ-level disorders in the human body are often correlated with diseases in other body parts. For instance, liver diseases can be linked with heart issues, while cancers can be linked with brain diseases (or psychological conditions). Defining such correlations is a complex task, and existing deep learning models that perform this task either showcase lower accuracy or are non-comprehensive when applied to real-time scenarios. To overcome these issues, this text proposes design of an augmented bioinspired deep learning-based multidomain body parameter analysis via heterogeneous correlative body organ analysis. The proposed model initially collects temporal and spatial data scans for different body parts and uses a multidomain feature extraction engine to convert these scans into vector sets. These vectors are processed by a Bacterial Foraging Optimizer (BFO), which assists in identification of highly variant feature sets, which are individually classified into different disease categories. A fusion of Inception Net, XCeption Net, and GoogLeNet Models is used to perform these classifications. The classified categories are linked with other disease types via temporal analysis of blood reports. The temporal analysis engine uses Modified Analytical Hierarchical Processing (MAHP) Model for calculating inter-organ disease dependency probabilities. Based on these probabilities, the model is able to generate a patient-level correlation map, which can be used by clinical experts to suggest remedial treatments, due to which the model was able to identify correlations between brain disorders and kidneys, heart diseases and lungs, heart diseases and liver, brain diseases and different types of cancers with high efficiency when evaluated under clinical scenarios. When validated on MITBIH, DEAP, CT Kidney, RIDER, and PLCO data samples, it was observed that the proposed model was capable of improving accuracy of correlation by 8.5%, while improving precision and recall by 3.2% when compared with existing correlation models under similar clinical scenarios.
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  • 文章类型: Case Reports
    一名39岁男性出现右下肢深静脉血栓。几年来,他的腹围一直在增加,但这在初次检查时未被发现。十八个月后,进行了计算机断层扫描,显示一个巨大的腹膜后囊肿(25×23×16厘米),抬起右髂外血管。对囊肿进行了完整的手术切除。囊肿是单眼的,含有5l透明液体。组织病理学检查发现囊壁薄,由纤维基质组织和单层上皮衬里组成。免疫组织化学染色显示内皮细胞标志物阳性,CD31和CD34,但对淋巴标记podoplanin(D2-40)呈阴性,对应于血管起源,很可能是静脉畸形.
    A 39-year-old male presented with deep venous thrombosis in the right lower limb. He had been experiencing increasing abdominal girth over several years, but this went undetected at the initial examination. Eighteen months later, a computed tomography was conducted, showing a huge retroperitoneal cyst (25 × 23 × 16 cm) lifting the right external iliac vessels. Complete surgical excision of the cyst was performed. The cyst was unilocular and contained 5 l of clear fluid. Histopathology examination found a thin cyst wall consisting of fibrous stromal tissue with a single-layer epithelium lining. Immunohistochemical staining revealed positivity for endothelial cell markers, CD31 and CD34, but negativity for the lymphatic marker podoplanin (D2-40), corresponding to a vascular origin, likely a venous malformation.
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  • 文章类型: Journal Article
    UNASSIGNED:评估一种新颖的无线定位技术的安全性和有效性,该技术使用射频识别标记用于肺部小病灶和深层病灶。
    UNASSIGNED:在2个日本中心对器械的初步使用进行了回顾性评估。在全身麻醉下,在混合手术室中,通过计算机断层扫描引导下的支气管镜检查将标记物放置在尽可能靠近肿瘤的位置.外科医生使用检测探针在没有肺触诊的情况下定位标记,该检测探针的色调改变以指示标记-探针距离。功效定义为功能标记物放置(支气管镜检查时间和标记物位置)和深缘距离。
    未经评估:对11个病变放置了12个标记(平均大小,6.8±2.7mm),距胸膜的平均深度为11.4±8.4mm(范围=0-26.0mm)。在12个标记中,在25.5±14.4分钟内将7个标记物(58.3%)放置在距病变10mm内。对于11个楔形切除,标记放置在6.7mm的平均距离处(范围,距病变0-13.0mm),平均距离为14.4mm(范围,3.0-42.0毫米)距胸膜。所有标记物均恢复,无并发症,所有肿瘤均切除,切缘阴性。对于5个损伤>10毫米深的胸膜(平均深度,18.9±5.5mm;范围,11.0-26.0mm),手术边缘的中位深度为11.6±2.1mm(范围,9.0-14.0毫米)。
    UASSIGNED:射频识别标记是安全且精确定位的肺部小病灶,包括深度。
    UNASSIGNED: To evaluate the safety and efficacy of a novel wireless localization technique that uses radiofrequency identification markers for small and deep lung lesions.
    UNASSIGNED: Preliminary use of the device was retrospectively evaluated in 2 Japanese centers. Under general anesthesia, a marker was placed as close as possible to the tumor via computed tomography-guided bronchoscopy in a hybrid operation theater. Surgeons located the marker without lung palpation using a detection probe the tone of which changed to indicate the marker-probe distance. Efficacy was defined as functional marker placement (bronchoscopy time and marker position) and deep margin distance.
    UNASSIGNED: Twelve markers were placed for 11 lesions (mean size, 6.8 ± 2.7 mm) located at a mean depth from the pleura of 11.4 ± 8.4 mm (range = 0-26.0 mm). Of 12 markers, 7 markers (58.3%) were placed within 10 mm from the lesion in 25.5 ± 14.4 minutes. For the 11 wedge resections, markers were placed at a mean distance of 6.7 mm (range, 0-13.0 mm) from the lesion and a mean distance of 14.4 mm (range, 3.0-42.0 mm) from the pleura. All markers were recovered without complications, and all tumors were resected with negative margins. For 5 lesions >10 mm deep to the pleura (mean depth, 18.9 ± 5.5 mm; range, 11.0-26.0 mm), the median depth of the surgical margin was 11.6 ± 2.1 mm (range, 9.0-14.0 mm).
    UNASSIGNED: Radiofrequency identification marking was safe and precisely localized small lung lesions, including their depth.
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  • 文章类型: Journal Article
    背景:早期逆境对儿童的生长发育产生负面影响,由这些不良经历导致的慢性生理应激。我们旨在估计印度农村学龄前儿童的前瞻性测量的累积早期逆境与生长和认知结果之间的关联,并探讨头发皮质醇浓度(HCC),衡量慢性生理压力,调解了上述关联。方法:参与者来自哈里亚纳邦农村的SPRINGcRCT,印度。在12个月时测量了1304名儿童在怀孕和生命的第一年经历的逆境。其中845例在12个月时测量了HCC。结果指标是身高年龄z得分(HAZ),体重年龄z评分(WAZ)和认知,在1124名儿童中测量,随访3年。使用名为DEEP的经过验证的基于平板电脑的游戏化工具来测量认知。结果:12个月的累积逆境与3年的所有结局指标呈负相关。逆境得分的每个单位增加导致DEEP-z得分的0·08个单位[95%置信区间(CI):-0·11,-0·06]降低;HAZ的0·12个单位[-0·14,-0·09]和WAZ的0·11个单位[-0·13,-0·09]。12个月HCC与DEEP-z评分(-0·09[-0·16,-0·01])和HAZ(-0·12[-0·20,-0·04])呈负相关,但与WAZ的相关性不显著(p=0·142)。HCC轻微介导了累积逆境与HAZ之间的关联(介导的比例=0·06,p=0·014)。对于认知结果,没有发现调解的证据。结论:在12个月时测量的累积早期逆境和HCC对3岁时的儿童成长和认知具有持续的负面影响。逆境与这两个儿童结局之间的关联是由HCC差异介导的,没有证据表明认知结果存在中介作用。未来的研究应该集中在其他压力生物标志物上,和其他途径,如免疫,炎症和细胞衰老途径,解开早期逆境和不良儿童结局之间既定关系的关键机制。
    Background: Early adversities negatively impact children\'s growth and development, putatively mediated by chronic physiological stress resulting from these adverse experiences. We aimed to estimate the associations between prospectively measured cumulative early adversities with growth and cognition outcomes in rural Indian preschool children and to explore if hair cortisol concentration (HCC), a measure of chronic physiological stress, mediated the above association. Methods: Participants were recruited from the SPRING cRCT in rural Haryana, India. Adversities experienced through pregnancy and the first year of life were measured in 1304 children at 12-months. HCC was measured at 12-months in 845 of them. Outcome measures were height-for-age-z-score (HAZ), weight-for-age-z-score (WAZ) and cognition, measured in 1124 children followed up at 3-years. Cognition was measured using a validated tablet-based gamified tool named DEEP. Results: Cumulative adversities at 12-months were inversely associated with all outcomes measures at 3-years. Each unit increase in adversity score led to a decrease of 0·08 units [95% confidence interval (CI):-0·11,-0·06] in DEEP-z-score; 0·12 units [-0·14,-0·09] in HAZ and 0·11 units [-0·13,-0·09] in WAZ. 12-month HCC was inversely associated with DEEP-z-score (-0·09 [-0·16,-0·01]) and HAZ (-0·12 [-0·20,-0·04]), but the association with WAZ was not significant (p = 0·142). HCC marginally mediated the association between cumulative adversities and HAZ (proportion mediated = 0·06, p = 0·014). No evidence of mediation was found for the cognition outcome. Conclusions: Cumulative early adversities and HCC measured at 12-months have persistent negative effects on child growth and cognition at 3-years. The association between adversities and these two child outcomes were differentially mediated by HCC, with no evidence of mediation observed for the cognitive outcome. Future studies should focus on other stress biomarkers, and alternate pathways such as the immune, inflammation and cellular ageing pathways, to unpack key mechanisms underlying the established relationship between early adversities and poor child outcomes.
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  • 文章类型: Journal Article
    背景技术理想的皮肤替代物应该与正常皮肤功能更相似,同时引起更少的反应。这项研究的目的是评估放射治疗对深度烧伤儿童最大程度地减少急性排斥反应和增强伤口愈合的影响。患者和方法一项前瞻性随机对照研究包括34名12岁以下深度烧伤的烧伤儿童。通过断层治疗装置,来自相关活体供体的同种皮肤移植物接受了500厘格雷(cGy)的局部放疗剂量。在照射完成后,立即将其用于覆盖制备的床。结果实验室参数的平均值(ESR,CRP,研究中所有烧伤患者的IL-6和TNF)均具有显着差异,p<0.001。从同种异体移植覆盖到出现排斥反应的时间的平均值±标准差(SD)在第1组为9.62±1.45,在第2组为14.35±2.8,p<0.001(非常显著差异),表明接受放射治疗可以减少移植物排斥反应。结论相关活体供体的同种异体皮肤暴露于局部低剂量放疗可降低移植物引发炎症和免疫反应的能力。从而最大程度地减少移植物的排斥反应,并增强患有深二度和三度烧伤的儿童的上皮形成。
    Background  The ideal skin substitute should be more similar to normal skin function while causing fewer reactions. The purpose of this study was to assess the effect of radiotherapy on minimizing acute rejection and enhancing wound healing in children with deep burns. Patients and Methods  A prospective randomized control study included 34 children admitted to the burn unit with deep burns under the age of 12 years. Through the tomotherapy device, a skin homograft from a related living donor was exposed to a local dose of radiotherapy of 500 centigray (cGy). It was immediately used for coverage of the prepared bed after the irradiation was completed. Results  The mean values of the laboratory parameters (ESR, CRP, IL-6, and TNF) for all burn patients in the study showed a significant difference, with p  < 0.001. The mean ± standard deviation (SD) of the time from homograft coverage to the appearance of rejection was 9.62 ± 1.45 in group 1 and 14.35 ± 2.8 in group 2, with p  < 0.001 (highly significant difference), indicating that exposure to radiotherapy can reduce graft rejection. Conclusions  The exposure of skin homografts from related living donors to a local low dose of radiotherapy can reduce a graft\'s ability to initiate inflammatory and immunological reactions, thereby minimizing rejection of a graft and enhancing epithelialization in children with deep second- and third-degree burns.
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  • 文章类型: Journal Article
    目的:建立深部脑出血患者血肿累及部位与血肿扩大(HE)的关系。
    方法:这项回顾性多中心研究包括2018年至2020年发病6小时内住院的深度ICH患者。排除患有继发性ICH的个体。根据入院和随访计算机断层扫描评估HE的体积。使用多变量逻辑回归分析,同时调整HE的混杂协变量,检查了深部ICH受累部位与HE之间的关联。
    结果:我们纳入了来自三个卒中中心的583名个体。最终总共460名患者的数据被用于分析;在这些患者中,159人(34.6%)患有HE。在没有调整的粗略模型中,外囊,内囊前肢,内囊后肢(PLIC)受累与HE相关。在完全调整了性别模型之后,年龄,脑室内出血,格拉斯哥昏迷量表录取分数,基线ICH体积,以及从发病到初始计算机断层扫描的时间,多变量逻辑回归显示,PLIC是深部ICH患者HE的可靠预测因子(校正比值比=2.73;95%置信区间=1.75-4.26;p<0.001)。
    结论:深度出血中内囊后肢的受累可能是HE的一个有希望的预测指标。
    OBJECTIVE: To establish the relationship between hematoma sites of involvement and hematoma expansion (HE) in patients with deep intracerebral hemorrhage (ICH).
    METHODS: Eligible patients with deep ICH admitted to hospital within 6 hours of onset between 2018 and 2020 were included in this retrospective multi-center study. Individuals with secondary ICH were excluded. The volume of HE was evaluated based on admission and follow-up computed tomography scans. Associations between deep ICH sites of involvement and HE were examined using multivariable logistic regression analysis while adjusting for confounding covariates of HE.
    RESULTS: We enrolled 583 individuals from three stroke centers. Data from a final total of 460 patients were used in the analysis; of these patients, 159 (34.6%) had HE. In the crude model without adjustment, external capsule, anterior limb of the internal capsule, and posterior limb of the internal capsule (PLIC) involvement were correlated with HE. After fully adjusted models for sex, age, intraventricular hemorrhage, Glasgow Coma Scale admission score, baseline ICH volume, and time from onset to initial computed tomography, multivariable logistic regression revealed that the PLIC is a robust predictor of HE in patients with deep ICH (adjusted odds ratio = 2.73; 95% confidence interval = 1.75-4.26; p < 0.001).
    CONCLUSIONS: Involvement of the posterior limb of the internal capsule in deep hemorrhage could be a promising predictor of HE.
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  • 文章类型: Journal Article
    UNASSIGNED: To investigate retinal layers\' thickness and vascular density after successful scleral buckle surgery using the optical coherence tomography angiography (OCTA) method.
    UNASSIGNED: In this prospective interventional case-control study, 24 patients with macular-off rhegmatogenous retinal detachment (RRD) were included after performing successful reattachment by scleral buckling. Retinal layers\' thickness and vascular density were assessed in the patients using the OCTA method compared to normal fellow eyes as controls 10 months postoperation.
    UNASSIGNED: Inner retinal layers showed no significant difference, but there was a significant reduction in outer central 1-mm retinal layers\' thickness. Outer plexiform-Bruch\'s membrane (153.1 ± 24.3 μm vs. 166.2 ± 15.1 μm, P = 0.003) and ellipsoid zone to Bruch\'s membrane (51.25 ± 9.3 μm vs. 57.35 ± 3.8 μm, P = 0.009) were thinner in the operated eyes compared to fellow eyes. Vascular density within a 300 μm wide region around the foveal avascular zone (FAZ) (foveal density-300) was significantly lower in the detached eyes (46.28% ± 7.12% vs. 51.01% ± 4.73%, P = 0.016), however, there was no difference in superficial and deep vascular density at 1-mm central circle. Superficial parafoveal vascular density was lower in the operated eyes (46.24% ± 5.30% vs. 49.52% ± 5.93%, P = 0.026) with no significant difference in deep parafoveal vascular density (49.93 ± 4.29% vs. 51.88% ± 4.79%, P = 0.137). There was no difference in FAZ area and perimeter between the two groups.
    UNASSIGNED: Complete recovery of retinal thickness and vascular density did not achieve in the patients with RRD even after 10 months of reattachment by scleral buckling surgery. Superficial capillary vascular density was more affected than deep vascular density almost in the parafoveal area.
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  • 文章类型: Journal Article
    BACKGROUND: For advanced breast cancer with lymph node involvement, adjuvant radiotherapy (RT) with regional nodal irradiation (RNI) has been indicated to reduce cancer recurrence and mortality. However, an extensive RT volume is associated with normal organ exposure, which increases the toxicity and affects patient outcomes. Modern arc RT techniques can improve normal organ sparing compared with conventional techniques. The aim of this study was to explore the optimal technique for left-breast RT with RNI.
    METHODS: We retrospectively reviewed patients receiving RT with RNI for left-breast cancer. We used modern arc RT techniques with either volumetric-modulated arc therapy (VMAT) or helical tomotherapy (HT) with a novel block technique, and compared differences in dosimetry parameters between the two groups. Subgroup analysis of RNI with or without internal mammary node (IMN) volume was also performed.
    RESULTS: A total of 108 eligible patients were enrolled between 2017 and 2020, of whom 70 received VMAT and 38 received HT. The median RT dose was 55 Gy. No significant differences were found regarding the surgery, RT dose, number of fractions, target volume, and RNI volume between the VMAT and HT groups. VMAT reduced the heart mean dose more than HT (3.82 vs. 5.13 Gy, p < 0.001), as well as the cardiac parameters of V5-V20, whole-lung mean dose, lung parameters of V5-V20, and contralateral-breast and esophagus mean dose. In the subgroup analysis of RNI with IMNs, the advantage of VMAT persisted in protecting the heart, lung, contralateral breast, and esophagus. HT was beneficial for lowering the thyroid mean dose. For RNI without IMN, VMAT improved the low-dose exposure of the heart and lung, but HT was similar to VMAT in terms of heart, whole-lung, and contralateral-breast mean dose.
    CONCLUSIONS: For patients with left-breast cancer receiving adjuvant RT with RNI, VMAT reduced the exposure dose to the heart, lung, contralateral breast, and esophagus compared with HT. VMAT was superior to HT in terms of normal organ sparing in the patients who underwent RNI with IMN irradiation. Considering the reduction in normal organ exposure and potential toxicity, VMAT is the optimal technique for patients receiving RNI when deep inspiration breath-hold is not available.
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