Body Fluids

体液
  • 文章类型: Journal Article
    背景:卵巢癌是隐匿的,通常在疾病的晚期发现。因为卵巢是盆腔器官,其盆腔液代谢产物的变化可能与卵巢癌有关。
    方法:使用液相色谱-串联质谱(LC-MS/MS)检测卵巢癌患者盆腔液的代谢组学变化,卵巢囊肿和子宫肌瘤。曲线下面积(AUC)分析用于评估脂质代谢产物和血液肿瘤指数的诊断性能。采用Pearson相关算法分析卵巢癌患者临床特征与脂质代谢产物的相关性。
    结果:卵巢癌患者盆腔液中有24种脂质代谢产物明显改变(p<0.05)。棕榈酰肉碱,硫胺素,脂质代谢物,血液肿瘤指数(CA15-3和CA125)显示AUC>0.8,棕榈酰肉碱达到0.942。此外,我们发现一些脂质代谢产物与临床分期显著相关,腹腔水量,淋巴转移,复发(p<0.05,r>0.5)。
    结论:特定脂质代谢产物水平是卵巢癌的潜在生物标志物,可能在卵巢癌的早期诊断和预后评估中起关键作用。
    结论:我们的结果表明,盆腔代谢产物,尤其是一些脂质代谢产物,在卵巢癌的诊断中起着重要的作用。同时,脂质部分代谢产物与卵巢癌患者的临床表现和预后密切相关。我们相信我们的研究对文献做出了重大贡献,因为它提供了一种更有效的卵巢癌检测的潜在方法。
    BACKGROUND: Ovarian cancer is insidious and usually detected in advanced stages of the disease. As the ovaries are pelvic organs, changes in their pelvic fluid metabolites may be associated with ovarian cancer.
    METHODS: Metabolomic changes in the pelvic fluid were detected using liquid chromatography-tandem mass spectrometry (LC-MS/MS) in patients with ovarian cancer, ovarian cysts and uterine fibroids. Area under the curve (AUC) analysis was used to assess the diagnostic performance of lipid metabolites and blood tumor indices. The Pearson correlation algorithm was used to analyze the correlation between clinical characteristics and lipid metabolites in ovarian cancer patients.
    RESULTS: There were 24 lipid metabolites significantly changed in the pelvic fluid of ovarian cancer patients (p < 0.05). Palmitoylcarnitine, lipoamide, lipid metabolites, and blood tumor indices (CA15-3 and CA125) showed AUC > 0.8, with palmitoylcarnitine reaching a high of 0.942. In addition, we found that some lipid metabolites were significantly associated with the clinical stage, abdominal water volume, lymphatic metastasis, and recurrence (p < 0.05, r > 0.5).
    CONCLUSIONS: Levels of specific lipid metabolites are potential biomarkers of ovarian cancer and may play a key role in the early diagnosis and prognostic assessment of ovarian cancer.
    CONCLUSIONS: Our results showed that pelvic metabolites, especially some lipid metabolites, play an important role in the diagnosis of ovarian cancer. Meanwhile, partial lipid metabolites were closely associated with the clinical presentation and prognosis of patients with ovarian cancer. We believe that our study makes a significant contribution to the literature because it provides a potential approach that is more effective for ovarian cancer detection.
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  • 文章类型: Randomized Controlled Trial
    OBJECTIVE: To observe the effect of penetrating-moxibustion therapy on postpartum uterine involution.
    METHODS: Eighty puerpera were randomized into an observation group and a control group, 40 cases in each one. In the control group, oxytocin injection was administered by intravenous drip, 20 U each time, once daily. In the observation group, on the base of the treatment as the control group, the penetrating-moxibustion therapy was used at Shenque (GV 8), Qihai (CV 6) and Guanyuan (CV 4), 30 min to 40 min each time, twice a day. The intervention of each group started from the first day after childbirth and lasted 3 days. The uterine volume before and after treatment, and in 42 days of postpartum, the height decrease of the fundus of the uterus, the score of visual analogue scale (VAS) for uterine contraction, the volume of lochia rubra in 1 to 3 days of treatment, and lochia duration were compared between the two groups; and the clinical effect was evaluated.
    RESULTS: The uterine volume in the observation group was smaller than that of the control group after treatment (P<0.01). In 1 to 3 days of treatment, the height decrease of the fundus of the uterus in the observation group was larger (P<0.01), VAS scores of uterine contraction were lower (P<0.05, P<0.01), the lochia rubra volume was less (P<0.01) than those in the control group. The duration of lochia rubra and lochia was shorter (P<0.01) in the observation group when compared with that of the control group. The favorable rate of uterine involution in the observation group was 95.0% (38/40), higher than that of the control group (75.0%, 30/40, P<0.05).
    CONCLUSIONS: Penetrating-moxibustion therapy accelerates the recovery of the uterine volume, relieves uterine contraction, shortens the duration of lochia, reduces the lochia volume and promotes the postpartum uterine involution.
    目的: 观察透灸法对产后子宫复旧的影响。方法: 将80例产妇随机分为观察组和对照组,每组40例。对照组予缩宫素注射液静脉滴注,每次20 U,每日1次;在对照组治疗基础上,观察组采用透灸法治疗,穴取神阙、气海、关元,每次30~40 min,每日2次。均从产后第1天开始,共治疗3 d。比较两组产妇治疗前后及产后42 d子宫体积、治疗1~3 d子宫底下降高度、治疗1~3 d宫缩痛视觉模拟量表(VAS)评分、治疗1~3 d阴道血性恶露量和恶露持续时间,并评定两组临床疗效。结果: 观察组治疗后子宫体积小于对照组(P<0.01),治疗1~3 d子宫底下降高度均大于对照组(P<0.01),治疗1~3 d宫缩痛 VAS评分均低于对照组(P<0.05,P<0.01),治疗1~3 d阴道血性恶露量均少于对照组(P<0.01),血性恶露及恶露持续时间短于对照组(P<0.01)。观察组子宫复旧良好率为95.0%(38/40),高于对照组的75.0%(30/40,P<0.05)。结论: 透灸法能加速产后子宫体积恢复,缓解宫缩痛,缩短恶露持续时间,减少恶露排出量,促进子宫复旧。.
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  • 文章类型: Journal Article
    在涉及暴力和谋杀的犯罪现场经常遇到含血混合物。然而,血的存在,以及这些混合物中血液与特定供体的关联在法医分析中提出了重大挑战。鉴于这些挑战,这项研究试图通过利用血液特异性甲基化位点和紧密相连的微单倍型位点来解决这些问题,提出了一种新的复合遗传标记,称为“血液特异性甲基化-微单倍型”。该标记物被设计用于检测血液和测定含血液混合物中的献血者。根据材料和方法部分中提到的选择标准,我们选择了10个血液特异性甲基化-微单倍型基因座纳入本研究.在这些基因座中,八个人表现出血液特异性低甲基化,而其余两个显示血液特异性超甲基化。根据我们研究中从124个样本中获得的数据,这10个成功测序的基因座的综合辨别力(CPD)为0.999999298。从大规模平行测序(MPS)获得样品等位基因甲基化率(Ram),其被定义为甲基化读取与被基因分型为特定等位基因的总聚类读取的比例。为了开发能够识别血液和献血者存在的等位基因类型分类模型,我们使用了随机森林算法。使用个体样品的Ram分布和模拟共享等位基因的Ram分布来训练和评估该模型。随后,我们应用开发的等位基因类型分类模型来预测实际混合物中的等位基因,试图排除非血液特异性等位基因,最终使我们能够确定血液和献血者在含有血液的混合物中的存在。我们的发现表明,这些血液特异性甲基化微单倍型基因座不仅能够检测血液的存在,而且能够通过DNA混合物解释方法以1:29、1:19、1:9、1:4、1:2、2:1、7:1、8:1、31:1和36:1(血液:非血液)此外,在含有四种体液(血液:阴道液:精液:唾液=1:1:1)的混合物中可以识别血液和真正的献血者的存在。重要的是要注意,虽然这些基因座表现出巨大的潜力,在解释结果时,必须考虑等位基因缺失和等位基因错误鉴定的影响.这是一项初步研究,利用血液特异性甲基化微单倍型作为其他已建立的遗传标记(STR,SNP,微单倍型,等。)用于分析含有血液的混合物。
    Blood-containing mixtures are frequently encountered at crime scenes involving violence and murder. However, the presence of blood, and the association of blood with a specific donor within these mixtures present significant challenges in forensic analysis. In light of these challenges, this study sought to address these issues by leveraging blood-specific methylation sites and closely linked microhaplotype sites, proposing a novel composite genetic marker known as \"blood-specific methylation-microhaplotype\". This marker was designed to the detection of blood and the determination of blood donor within blood-containing mixtures. According to the selection criteria mentioned in the Materials and Methods section, we selected 10 blood-specific methylation-microhaplotype loci for inclusion in this study. Among these loci, eight exhibited blood-specific hypomethylation, while the remaining two displayed blood-specific hypermethylation. Based on data obtained from 124 individual samples in our study, the combined discrimination power (CPD) of these 10 successfully sequenced loci was 0.999999298. The sample allele methylation rate (Ram) was obtained from massive parallel sequencing (MPS), which was defined as the proportion of methylated reads to the total clustered reads that were genotyped to a specific allele. To develop an allele type classification model capable of identifying the presence of blood and the blood donor, we used the Random Forest algorithm. This model was trained and evaluated using the Ram distribution of individual samples and the Ram distribution of simulated shared alleles. Subsequently, we applied the developed allele type classification model to predict alleles within actual mixtures, trying to exclude non-blood-specific alleles, ultimately allowing us to identify the presence of blood and the blood donor in the blood-containing mixtures. Our findings demonstrate that these blood-specific methylation-microhaplotype loci have the capability to not only detect the presence of blood but also accurately associate blood with the true donor in blood-containing mixtures with the mixing ratios of 1:29, 1:19, 1:9, 1:4, 1:2, 2:1, 7:1, 8:1, 31:1 and 36:1 (blood:non-blood) by DNA mixture interpretation methods. In addition, the presence of blood and the true blood donor could be identified in a mixture containing four body fluids (blood:vaginal fluid:semen:saliva = 1:1:1:1). It is important to note that while these loci exhibit great potential, the impact of allele dropouts and alleles misidentification must be considered when interpreting the results. This is a preliminary study utilising blood-specific methylation-microhaplotype as a complementary tool to other well-established genetic markers (STR, SNP, microhaplotype, etc.) for the analysis in blood-containing mixtures.
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  • 文章类型: Journal Article
    目的:过量液体的有害影响经常表现在肺部。胸腔积液(TFC)是STARLINGTM生物排除监测仪提供的变量,代表胸腔内液体的总体积。目的是分析术后24小时TFC值(TFCd0%)变化之间的关联,术后液体平衡,术后肺部并发症。
    方法:前瞻性和分析性观察研究。包括在三级教学医院进行大型腹部手术的患者。在干预期间和术后前24小时用监测器监测它们。STARLINGTM,测量围手术期不同阶段的TFC及其变化。进行连续的肺部超声检查,并记录术后肺部并发症。采用Logistic回归预测肺不张和肺淤血的发生。计算Pearson相关系数以验证TFC与流体平衡之间的关联。
    结果:对50例患者进行分析。在术后第一天早上测量的TFCd0%增加了27.1%的中位数[IQR:20.3-37.5],并且在r=0.44时与677ml[IQR:125.5-1,412]的术后平衡相关。TFC升高与肺不张(OR=1.24)和肺充血(OR=1.3)的风险增加有关。
    结论:术后24小时测得的TFCd0%与术后液体平衡呈中等相关性。它的增加是术后肺部并发症出现的危险因素。
    OBJECTIVE: The harmful effects of excess fluids frequently manifest in the lungs. Thoracic fluid content (TFC) is a variable provided by the STARLINGTM bioreactance monitor, which represents the total volume of fluid in the chest. The objective is to analyse the association between the variation in TFC values (TFCd0%) at 24 h postoperatively, postoperative fluid balance, and postoperative pulmonary complications.
    METHODS: Prospective and analytical observational study. Patients scheduled for major abdominal surgery at a tertiary teaching hospital were included. They were monitored during the intervention and the first 24 postoperative hours with the monitor. STARLINGTM, measuring TFC and its variation in different stages of the perioperative period. Serial lung ultrasounds were performed and postoperative pulmonary complications were recorded. Logistic regression was performed to predict the occurrence of atelectasis and pulmonary congestion. The Pearson correlation coefficient was calculated to verify the association between TFC and fluid balance.
    RESULTS: 50 patients were analyzed. TFCd0% measured on the morning of the first postoperative day increased by a median of 27.1% [IQR: 20.3-37.5] and was correlated at r = 0.44 with the postoperative balance of 677 ml [IQR: 125.5-1,412]. Increased TFC was related to a higher risk of atelectasis (OR = 1.24) and pulmonary congestion (OR = 1.3).
    CONCLUSIONS: TFCd0% measured 24 h after surgery presents a moderate correlation with postoperative fluid balance. Its increase is a risk factor for the appearance of postoperative pulmonary complications.
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  • 文章类型: Journal Article
    该研究旨在确定急性下消化道出血患者的预后因素,并开发一种高精度的预测工具。分析包括8254例急性便血患者,这些患者是根据急诊医师或消化内科顾问的判断紧急入院的(来自CODEBLUEJ研究)。使用随机数字表以2:1的比例将患者随机分配到衍生队列和验证队列。假设入院时存在的因素与入院后30天内的死亡率有关,并将住院期间的管理因素添加到入院时的因素中,建立预后因素。进行了多因素分析,并使用回归系数将分数分配给每个因素,将这些相加来衡量分数。新创建的评分(CACHEXIA评分)成为能够测量30天内(ROC-AUC0.93)和1年内(C指数,0.88)。患者的1年死亡率被归类为低,中等,CACHEXIA评分的高风险为1.0%,13.4%,分别为54.3%(均P<0.001)。放电后,使用我们独特的预测评分确定为高风险的患者需要持续观察.
    The study aimed to identify prognostic factors for patients with acute lower gastrointestinal bleeding and to develop a high-accuracy prediction tool. The analysis included 8254 cases of acute hematochezia patients who were admitted urgently based on the judgment of emergency physicians or gastroenterology consultants (from the CODE BLUE J-study). Patients were randomly assigned to a derivation cohort and a validation cohort in a 2:1 ratio using a random number table. Assuming that factors present at the time of admission are involved in mortality within 30 days of admission, and adding management factors during hospitalization to the factors at the time of admission for mortality within 1 year, prognostic factors were established. Multivariate analysis was conducted, and scores were assigned to each factor using regression coefficients, summing these to measure the score. The newly created score (CACHEXIA score) became a tool capable of measuring both mortality within 30 days (ROC-AUC 0.93) and within 1 year (C-index, 0.88). The 1-year mortality rates for patients classified as low, medium, and high risk by the CACHEXIA score were 1.0%, 13.4%, and 54.3% respectively (all P < 0.001). After discharge, patients identified as high risk using our unique predictive score require ongoing observation.
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  • 文章类型: Randomized Controlled Trial
    在这项研究中,目的观察慢性心力衰竭患者治疗前后心肌纤维化指标的变化,并评价天花粉皮(TP)注射液的抗慢性心力衰竭和心室重构作用.这项研究是单中心的,打开,单盲,最佳疗效设计的随机对照研究。患者连续随机分为两组,TP注射组36例,常规治疗组36例。采用ELISA法检测出院前后心肌纤维化指标的变化,包括转化生长因子β(TGF-β),血清透明质酸(HA),I型前胶原(PCI),层粘连蛋白(LN)和III型前胶原(PCIII)。两组临床资料及医治前心肌纤维化基线水平无明显差别。治疗后,与常规治疗组相比,注射TP后心肌纤维化指数显著下降。我们的发现表明,TP注射联合常规药物可以通过减少血管紧张素II来减轻心肌纤维化。醛固酮,TGFβ,HA,PCI,金属基质蛋白酶2,结缔组织生长因子和LN促进慢性心力衰竭患者的心室重塑。
    In this research, we aimed to observe the changes in myocardial fibrosis indices in patients with chronic heart failure before and after treatment and to evaluate the anti-chronic heart failure and ventricular remodelling effects of Trichosanthis peel (TP) injection. This study was a single-center, open, single-blind, randomized controlled study with an optimal efficacy design. Patients were consecutively and randomly divided into two groups, with 36 patients in the TP injection group and 36 patients in the conventional treatment group. ELISA was used to measure changes in myocardial fibrosis indices before and after discharge, including transforming growth factor β (TGF-β), serum hyaluronic acid (HA), type I procollagen (PCI), laminin (LN) and type III procollagen (PCIII). There was no significant difference between the two groups in clinical data or baseline level of myocardial fibrosis before treatment. After treatment, compared with the conventional treatment group, the myocardial fibrosis index was significantly decreased following TP injection. Our findings indicate that TP injection combined with conventional medicine can attenuate myocardial fibrosis by reducing angiotensin II, aldosterone, TGFβ, HA, PCI, metallomatrix proteinase 2, connective tissue growth factor and LN and promote ventricular remodelling in patients with chronic heart failure.
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  • 文章类型: Journal Article
    背景:职业血液和体液暴露(OBE)是医疗机构中高度关注的全球健康问题。暴露后不适当或不适当的做法会增加血源性病原体感染的风险。了解OBE的风险因素并评估暴露后的做法将有助于医护人员(HCWs)的福祉。
    方法:本研究回顾性综合并回顾了三级教学医院OBE的10年数据(从2010年到2020年)。
    结果:共有519家HCWs报告了OBE,从2010年到2020年逐年增加。其中,大多数是护士(247[47.2%]),女性(390[75.1%]),23-27岁(207[39.9%])。乙型肝炎是暴露于HCWs的主要血源性病原体,285例(54.9%),内科是主要的接触部位(161[31.0%]),锐器伤是主要的暴露途径(439[84.6%])。数据分析表明,暴露途径之间存在显著差异,暴露的病原体,不同职业类别的接触部位(X2=14.5、43.7、94.3,P均<0.001)。3.3%的医护人员没有采取任何暴露后的做法。对于经皮暴露,4.7%没有冲洗伤口,3.3%的人没有挤出伤口,2.3%没有对伤口进行消毒。在粘膜暴露的情况下,90.4%立即清洁暴露区域。
    结论:过去十年的数据强调了中国三级医院OBE现状的严重性,特别是在年轻的HCWs中,乙型肝炎是主要的血液传播病原体。这项研究还确定了医护人员可能采取不正确的暴露后做法。这是至关重要的,在未来讨论的有效性的主要群体有针对性的专业具体指导,以预防此类事故,同时,在强制性健康检查中包括血液传播疾病免疫力检测。此外,专注于优化曝光后实践,在未来的研究中,也应考虑采取重大措施预防此类事件并降低感染风险。
    BACKGROUND: Occupational blood and body fluid exposure (OBEs) is a highly concerning global health problem in health facilities. Improper or inadequate post-exposure practices increase the risk of infection with bloodborne pathogens. Understanding risk factors for OBEs and evaluating the post-exposure practices will contribute to healthcare workers\' (HCWs) well-being.
    METHODS: This study retrospectively synthesized and reviewed the 10-year data (from 2010 to 2020) on OBEs in a tertiary teaching hospital.
    RESULTS: A total of 519 HCWs have reported OBEs, increasing yearly from 2010 to 2020. Of these, most were nurses (247 [47.2%]), female (390 [75.1%]), at 23-27 years old (207 [39.9%]). The hepatitis B was the primary bloodborne pathogen exposed to HCWs, with 285 (54.9%) cases, internal medicine was the main exposure site (161 [31.0%]), and sharp injury was the main exposure route (439 [84.6%]). Data analysis shows that there are significant differences between exposure route, exposed pathogens, and exposure site among the different occupational categories (X2 = 14.5, 43.7, 94.3, all P < 0.001). 3.3% of HCWs did not take any post-exposure practices. For percutaneous exposure, 4.7% did not rinse the wound, 3.3% did not squeeze out the wound, and 2.3% did not disinfect the wound. In the case of mucosal exposure, 90.4% clean the exposure area immediately.
    CONCLUSIONS: The data from the past decade underscores the seriousness of current situation of OBEs in Chinese tertiary hospital, particularly among young HCWs, and with hepatitis B as the predominant blood-borne pathogen. This study also identifies HCWs may take incorrect post-exposure practices. It\'s crucial in the future to discuss the effectiveness of main groups targeted for focused specialty-specific guidance for the prevention of such accidents, meanwhile, to include blood-borne disease immunity testing in mandatory health check-ups. Additionally, focus on optimizing post-exposure practices, offering significant steps toward prevention of such incidents and reducing infection risks should also be considered in future studies.
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  • 文章类型: Observational Study
    MiniMed780G是波兰第一个先进的混合闭环(AHCL)系统,2020年在欧盟获得批准。迄今为止,已发表了长达12个月的血糖控制观察结果.这项研究旨在分析使用AHCL系统两年后儿童和青少年1型糖尿病(T1D)的血糖控制和人体测量参数。
    我们前瞻性地收集了人体测量数据,泵,和50名T1D儿童的连续血糖记录(9.9±2.4岁,24名(48%)男孩,T1D3.9±2.56年)使用AHCL系统。我们将AHCL登记后获得的两周AHCL记录与开始AHCL后6、12和24个月的数据进行了比较。
    时间范围(70-180mg/dl)和BMIz评分在2年的观察期间没有变化(p>0.05)。每日总胰岛素中自动校正的百分比显着增加(p<0.005)。
    接受AHCL系统治疗2年的T1D患儿组的血糖控制保持稳定。这一组的儿童保持体重和最佳的代谢控制,最有可能是由于自动校正推注。
    MiniMed 780G is the first Advanced Hybrid Closed Loop (AHCL) system in Poland, approved in the EU in 2020. To date, observations of glycemic control up to 12 months have been published. This study aimed to analyze glycemic control and anthropometric parameters in children and adolescents with type 1 diabetes (T1D) after two years of using the AHCL system.
    We prospectively collected anthropometric data, pump, and continuous glucose records of fifty T1D children (9.9 ± 2.4 years, 24 (48%) boys, T1D for 3.9 ± 2.56 years) using an AHCL system. We compared the two-week AHCL records obtained after AHCL enrollment with data 6, 12, and 24 months after starting AHCL.
    Time in range (70-180 mg/dl) and BMI z-score did not change during the 2 years of observation (p>0.05). The percentage of autocorrection in total daily insulin increased significantly (p<0.005).
    Glycemic control in the investigated group of children with T1D treated with the AHCL system for 2 years remained stable. Children in this group maintained weight and optimal metabolic control, most likely due to autocorrection boluses.
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  • 文章类型: Journal Article
    托斯卡纳病毒(TOSV),沙蝇传播的病毒,是夏季地中海地区人类急性脑膜炎和脑膜脑炎的重要病因。然而,TOSV感染的实际数量被低估了.实验室确认是必要的,因为TOSV感染与其他神经侵袭性病毒感染具有重叠的临床特征。如今,在TOSV感染急性期直接诊断的参考测试是基于PCR的方法,用于检测脑脊液和/或血浆中的TOSV,血清,或者血.虽然就业差,尿液是另一种有助于TOSV检测的生物基质。尿液是富含影响PCR效率的PCR抑制剂的基质;因此,可能会产生假阴性。探讨尿液PCR抑制剂对TOSV检测的潜在影响,我们使用10倍系列加标TOSV比较了未稀释和稀释的尿液。结果表明,稀释尿液中的TOSV检测性能显着改善(1TCID50与1×104TCID50检测限和101.35%vs.129.62%效率,分别,在稀释和未稀释的尿液中)。总之,我们的数据为使用稀释的尿液限制尿液对基于RT-PCR的TOSV检测的抑制作用的影响提供了初步的重要见解.
    Toscana virus (TOSV), a sandfly-borne virus, is an important etiological agent in human acute meningitis and meningoencephalitis in the Mediterranean area during the summer. However, the actual number of TOSV infections is underestimated. Laboratory confirmation is necessary because TOSV infection has overlapping clinical features with other neuro-invasive viral infections. Nowadays, the reference test for direct diagnosis in the acute phase of TOSV infection is the PCR based method for detecting TOSV in cerebrospinal fluid and/or plasma, serum, or blood. Although poorly employed, urine is another helpful biological matrix for TOSV detection. Urine is a matrix rich in PCR inhibitors that affect PCR efficiency; consequently, false negatives could be generated. To investigate the potential effect of urine PCR inhibitors on TOSV detection, we compared undiluted and diluted urine using 10-fold series of spiked TOSV. The results showed a significant improvement in TOSV detection performance in diluted urine (1 TCID50 vs. 1 × 104 TCID50 limit of detection and 101.35% vs. 129.62% efficiency, respectively, in diluted and undiluted urine). In conclusion, our data provide preliminary important insights into the use of diluted urine to limit the impact of the inhibitory effects of urine on the detection of TOSV in RT-PCR-based approaches.
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  • 文章类型: Journal Article
    Bland-Altman方法是用于方法比较和分析协议的最广泛使用的数学方法之一。这项工作描述了,第一次,Bland-Altman在研究人血浆中L-精氨酸/一氧化氮途径内源性分析物的14N/15N和1H/2H(D)色谱同位素效应中的应用,GC-MS中的血清和尿液样本。研究的分析物包括精氨酸,不对称二甲基精氨酸,二甲胺,亚硝酸盐,硝酸盐和肌酐.Bland-Altman方法的同位素保留时间的百分比差异与接受者工作特征(ROC)方法的曲线下面积(AUC)值之间存在密切的相关性(r=0.8619,p=0.0047)。研究结果表明,GC-MS中的色谱同位素效应是由于衍生物中H/D同位素与GC色谱柱疏水固定相的相互作用强度不同所致。D原子减弱分子骨架与亲脂性GC固定相的相互作用。认为GC-MS中血浆或血清和尿液中同位素效应的差异是由于一种基质效应,这还有待在即将进行的研究中使用Bland-Altman和ROC方法进行研究。
    The Bland-Altman approach is one of the most widely used mathematical approaches for method comparison and analytical agreement. This work describes, for the first time, the application of Bland-Altman to study 14N/15N and 1H/2H (D) chromatographic isotope effects of endogenous analytes of the L-arginine/nitric oxide pathway in human plasma, serum and urine samples in GC-MS. The investigated analytes included arginine, asymmetric dimethylarginine, dimethylamine, nitrite, nitrate and creatinine. There was a close correlation between the percentage difference of the retention times of the isotopologs of the Bland-Altman approach and the area under the curve (AUC) values of the receiver operating characteristic (ROC) approach (r = 0.8619, p = 0.0047). The results of the study suggest that the chromatographic isotope effects in GC-MS result from differences in the interaction strengths of H/D isotopes in the derivatives with the hydrophobic stationary phase of the GC column. D atoms attenuate the interaction of the skeleton of the molecules with the lipophilic GC stationary phase. Differences in isotope effects in plasma or serum and urine in GC-MS are suggested to be due to a kind of matrix effect, and this remains to be investigated in forthcoming studies using Bland-Altman and ROC approaches.
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