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Advancements in the study of acute lung injury resulting from intestinal ischemia/reperfusion 肠道缺血/再灌注导致急性肺损伤的研究进展
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1399744
Shihua Lv, Xudong Zhao, Can Ma, Dengming Zhao, Tian Sun, Wenchao Fu, Yuting Wei, Wenzhi Li
Intestinal ischemia/reperfusion is a prevalent pathological process that can result in intestinal dysfunction, bacterial translocation, energy metabolism disturbances, and subsequent harm to distal tissues and organs via the circulatory system. Acute lung injury frequently arises as a complication of intestinal ischemia/reperfusion, exhibiting early onset and a grim prognosis. Without appropriate preventative measures and efficacious interventions, this condition may progress to acute respiratory distress syndrome and elevate mortality rates. Nonetheless, the precise mechanisms and efficacious treatments remain elusive. This paper synthesizes recent research models and pertinent injury evaluation criteria within the realm of acute lung injury induced by intestinal ischemia/reperfusion. The objective is to investigate the roles of pathophysiological mechanisms like oxidative stress, inflammatory response, apoptosis, ferroptosis, and pyroptosis; and to assess the strengths and limitations of current therapeutic approaches for acute lung injury stemming from intestinal ischemia/reperfusion. The goal is to elucidate potential targets for enhancing recovery rates, identify suitable treatment modalities, and offer insights for translating fundamental research into clinical applications.
肠道缺血/再灌注是一种常见的病理过程,可导致肠道功能障碍、细菌转运、能量代谢紊乱,进而通过循环系统对远端组织和器官造成伤害。急性肺损伤常常是肠道缺血/再灌注的并发症,发病早,预后差。如果不采取适当的预防措施和有效的干预措施,这种情况可能会发展为急性呼吸窘迫综合征,并提高死亡率。然而,精确的发病机制和有效的治疗方法仍然难以捉摸。本文综述了肠道缺血/再灌注诱发急性肺损伤领域的最新研究模型和相关损伤评估标准。目的是阐明提高恢复率的潜在靶点,确定合适的治疗模式,并为将基础研究转化为临床应用提供见解。
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引用次数: 0
Application of non-contact sensors for health monitoring in hospitals: a narrative review 非接触式传感器在医院健康监测中的应用:综述
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1421901
Yoo Jin Choo, G. Lee, Jun Sung Moon, Min Cheol Chang
The continuous monitoring of the health status of patients is essential for the effective monitoring of disease progression and the management of symptoms. Recently, health monitoring using non-contact sensors has gained interest. Therefore, this study aimed to investigate the use of non-contact sensors for health monitoring in hospital settings and evaluate their potential clinical applications. A comprehensive literature search was conducted using PubMed to identify relevant studies published up to February 26, 2024. The search terms included “hospital,” “monitoring,” “sensor,” and “non-contact.” Studies that used non-contact sensors to monitor health status in hospital settings were included in this review. Of the 38 search results, five studies met the inclusion criteria. The non-contact sensors described in the studies were radar, infrared, and microwave sensors. These non-contact sensors were used to obtain vital signs, such as respiratory rate, heart rate, and body temperature, and were then compared with the results from conventional measurement methods (polysomnography, nursing records, and electrocardiography). In all the included studies, non-contact sensors demonstrated a performance similar to that of conventional health-related parameter measurement methods. Non-contact sensors are expected to be a promising solution for health monitoring in hospital settings.
持续监测患者的健康状况对于有效监测疾病进展和控制症状至关重要。最近,使用非接触式传感器进行健康监测受到了关注。因此,本研究旨在调查在医院环境中使用非接触式传感器进行健康监测的情况,并评估其潜在的临床应用。本研究使用 PubMed 进行了全面的文献检索,以确定截至 2024 年 2 月 26 日发表的相关研究。搜索关键词包括 "医院"、"监测"、"传感器 "和 "非接触式"。使用非接触式传感器监测医院环境中健康状况的研究被纳入了本次综述。在 38 项搜索结果中,有 5 项研究符合纳入标准。研究中描述的非接触式传感器包括雷达、红外线和微波传感器。这些非接触式传感器用于获取呼吸频率、心率和体温等生命体征,然后与传统测量方法(多导睡眠图、护理记录和心电图)的结果进行比较。在所有纳入的研究中,非接触式传感器都显示出与传统健康相关参数测量方法相似的性能。非接触式传感器有望成为医院环境中健康监测的一种有前途的解决方案。
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引用次数: 0
Interpretability-based machine learning for predicting the risk of death from pulmonary inflammation in Chinese intensive care unit patients 基于可解释性的机器学习预测中国重症监护室患者肺部炎症的死亡风险
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1399527
Yihai Zhai, Danxiu Lan, Siying Lv, Liqin Mo
The objective of this research was to create a machine learning predictive model that could be easily interpreted in order to precisely determine the risk of premature death in patients receiving intensive care after pulmonary inflammation.In this study, information from the China intensive care units (ICU) Open Source database was used to examine data from 2790 patients who had infections between January 2019 and December 2020. A 7:3 ratio was used to randomly assign the whole patient population to training and validation groups. This study used six machine learning techniques: logistic regression, random forest, gradient boosting tree, extreme gradient boosting tree (XGBoost), multilayer perceptron, and K-nearest neighbor. A cross-validation grid search method was used to search the parameters in each model. Eight metrics were used to assess the models’ performance: accuracy, precision, recall, F1 score, area under the curve (AUC) value, Brier score, Jordon’s index, and calibration slope. The machine methods were ranked based on how well they performed in each of these metrics. The best-performing models were selected for interpretation using both the Shapley Additive exPlanations (SHAP) and Local interpretable model-agnostic explanations (LIME) interpretable techniques.A subset of the study cohort’s patients (120/1668, or 7.19%) died in the hospital following screening for inclusion and exclusion criteria. Using a cross-validated grid search to evaluate the six machine learning techniques, XGBoost showed good discriminative ability, achieving an accuracy score of 0.889 (0.874–0.904), precision score of 0.871 (0.849–0.893), recall score of 0.913 (0.890–0.936), F1 score of 0.891 (0.876–0.906), and AUC of 0.956 (0.939–0.973). Additionally, XGBoost exhibited excellent performance with a Brier score of 0.050, Jordon index of 0.947, and calibration slope of 1.074. It was also possible to create an interactive internet page using the XGBoost model.By identifying patients at higher risk of early mortality, machine learning-based mortality risk prediction models have the potential to significantly improve patient care by directing clinical decision making and enabling early detection of survival and mortality issues in patients with pulmonary inflammation disease.
本研究的目的是创建一个易于解释的机器学习预测模型,以精确确定肺部炎症后接受重症监护的患者过早死亡的风险。在本研究中,我们使用了中国重症监护病房(ICU)开源数据库中的信息,对2019年1月至2020年12月期间发生感染的2790名患者的数据进行了研究。采用7:3的比例将全部患者随机分配到训练组和验证组。本研究使用了六种机器学习技术:逻辑回归、随机森林、梯度提升树、极端梯度提升树(XGBoost)、多层感知器和 K 最近邻。交叉验证网格搜索法用于搜索每个模型的参数。评估模型性能的指标有八个:准确度、精确度、召回率、F1得分、曲线下面积(AUC)值、布赖尔得分、乔丹指数和校准斜率。根据机器方法在上述各项指标中的表现对其进行排名。在根据纳入和排除标准进行筛选后,研究队列中的一部分患者(120/1668,或 7.19%)在医院死亡。通过交叉验证网格搜索对六种机器学习技术进行评估,XGBoost 显示出良好的判别能力,准确率为 0.889(0.874-0.904),精确度为 0.871(0.849-0.893),召回率为 0.913(0.890-0.936),F1 为 0.891(0.876-0.906),AUC 为 0.956(0.939-0.973)。此外,XGBoost 的 Brier 得分为 0.050,Jordon 指数为 0.947,校准斜率为 1.074,表现出色。通过识别早期死亡风险较高的患者,基于机器学习的死亡风险预测模型有可能指导临床决策,并能早期发现肺部炎症患者的生存和死亡问题,从而显著改善患者护理。
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引用次数: 0
Case report: A rare case of isolated sigmoid Rosai-Dorfman disease on contrast-enhanced CT and 18F-FDG PET/CT 病例报告:对比增强 CT 和 18F-FDG PET/CT 显示孤立乙状结肠罗赛-多夫曼病的罕见病例
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1425112
Wanling Qi, Zhehuang Luo, Mingyan Shao, Min Chen, Fengxiang Liao, Linfeng Hu
Rosai-Dorfman disease (RDD) is an uncommon histiocytic disorder that occurs in nodal and/or extranodal sites. Extranodal RDD exhibits a wide range of clinical and radiological presentations, frequently leading to misdiagnoses. Involvement of the gastrointestinal (GI) system is uncommon, accounting for less than 1% of the reported cases. Here we present a case of a 54-year-old male who complained of abdominal distention and was diagnosed with RDD affecting the sigmoid colon, manifesting as a sigmoid mass. The patient had a past medical history of liver transplantation due to hepatocellular carcinoma (HC). This report details the multiphase contrast-enhanced computed tomography (CT) and fluorodeoxyglucose (18F-FDG) positron emission tomography (PET-CT) imaging findings of RDD involving the sigmoid colon without lymphadenopathy, and a review of the relevant literature is provided.
罗赛-多夫曼病(RDD)是一种不常见的组织细胞疾病,好发于结节和/或结节外部位。结节外 RDD 的临床和放射学表现多种多样,经常导致误诊。胃肠道(GI)系统受累的病例并不多见,仅占报告病例的不到1%。在此,我们介绍了一例 54 岁男性患者的病例,他主诉腹胀,被诊断为影响乙状结肠的 RDD,表现为乙状结肠肿块。患者既往曾因肝细胞癌(HC)接受过肝移植手术。本报告详细介绍了多相位对比增强计算机断层扫描(CT)和氟脱氧葡萄糖(18F-FDG)正电子发射计算机断层扫描(PET-CT)对累及乙状结肠且无淋巴结病的 RDD 的成像结果,并对相关文献进行了综述。
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引用次数: 0
Feasibility and reliability of measured glomerular filtration rate with [I125]-iothalamate among young adults with mild-to-moderate cerebral palsy 用[I125]-硫柳汞测量轻中度脑瘫患者肾小球滤过率的可行性和可靠性
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1295104
Daniel G. Whitney, Andrea L. Oliverio, Jodi Kreschmer, Shannen Bolde, E. Hurvitz, Ka Kit Wong
Despite the need, measuring glomerular filtration rate (mGFR) is not routinely performed for adults with cerebral palsy (CP), possibly due to unknown feasibility given the secondary complications of CP. This study aimed to assess the feasibility and reliability of mGFR and explore factors associated with eGFR-mGFR discordance among young adults with mild-to-moderate CP.This single-center, cross-sectional study included 18- to 40-year-olds with CP gross motor function classification system (GMFCS) I-III. The participants were excluded if they were pregnant/lactating, had cognitive impairments, or had contraindications to mGFR. A routine clinical protocol for mGFR and eGFR was used. mGFR feasibility was assessed based on the number of participants who completed testing. mGFR reliability was assessed using the coefficient of variation (CV) across the four 30 min intervals. The association between age, sex, and GMFCS and the percentage of eGFR-mGFR discordance was assessed.Of the 19 participants enrolled, 18 completed the testing [mean age (SD), 29.9 (7.4) years, n = 10 female participants, n = 10/3/5 for GMFCS I/II/III] and most (n = 15) of the participants had an mGFR >90 mL/min; 14 participants (77.8%) had a CV <20%, 2 had a CV between 20 and 25%, and 2 had a CV >50%. eGFR overestimated mGFR by a median (interquartile range) of approximately 17.5% (2–38%); the full range of mis-estimation was −20.5 to 174.3%. Increasing age and GMFCS levels exhibited notable, but weak-to-modest, associations with a larger eGFR-mGFR discordance.Obtaining mGFR was feasible and reasonably reliable within this small sample. eGFR overestimated mGFR by a notable amount, which may be associated with patient-level factors.
尽管有此需要,但测量肾小球滤过率(mGFR)并非脑瘫(CP)成人的常规方法,这可能是由于CP的继发性并发症导致可行性未知。本研究旨在评估 mGFR 的可行性和可靠性,并探讨轻度至中度 CP 青壮年 eGFR 与 mGFR 不一致的相关因素。这项单中心横断面研究纳入了 18 至 40 岁的 CP 运动功能分级系统(GMFCS)I-III 级患者。怀孕/哺乳期、有认知障碍或有 mGFR 禁忌症的参与者被排除在外。mGFR 的可行性根据完成测试的参与者人数进行评估。mGFR 的可靠性根据四个 30 分钟间隔的变异系数(CV)进行评估。评估了年龄、性别、GMFCS 与 eGFR-mGFR不一致比例之间的关系。在 19 名参加者中,18 人完成了测试[平均年龄(标清)29.9(7.大多数参与者(n = 15)的 mGFR >90 mL/min;14 名参与者(77.8%)的 CV 值为 50%。eGFR 高估 mGFR 的中位数(四分位间范围)约为 17.5% (2-38%);误估范围为-20.5% 至 174.3%。在这个小样本中,获得 mGFR 是可行且相当可靠的。
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引用次数: 0
Predicting COPD exacerbations based on quantitative CT analysis: an external validation study 基于 CT 定量分析预测慢性阻塞性肺病恶化:一项外部验证研究
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1370917
Ji Wu, Yao Lu, Sunbin Dong, Luyang Wu, Xiping Shen
Quantitative computed tomography (CT) analysis is an important method for diagnosis and severity evaluation of lung diseases. However, the association between CT-derived biomarkers and chronic obstructive pulmonary disease (COPD) exacerbations remains unclear. We aimed to investigate its potential in predicting COPD exacerbations.Patients with COPD were consecutively enrolled, and their data were analyzed in this retrospective study. Body composition and thoracic abnormalities were analyzed from chest CT scans. Logistic regression analysis was performed to identify independent risk factors of exacerbation. Based on 2-year follow-up data, the deep learning system (DLS) was developed to predict future exacerbations. Receiver operating characteristic (ROC) curve analysis was conducted to assess the diagnostic performance. Finally, the survival analysis was performed to further evaluate the potential of the DLS in risk stratification.A total of 1,150 eligible patients were included and followed up for 2 years. Multivariate analysis revealed that CT-derived high affected lung volume/total lung capacity (ALV/TLC) ratio, high visceral adipose tissue area (VAT), and low pectoralis muscle cross-sectional area (CSA) were independent risk factors causing COPD exacerbations. The DLS outperformed exacerbation history and the BMI, airflow obstruction, dyspnea, and exercise capacity (BODE) index, with an area under the ROC (AUC) value of 0.88 (95%CI, 0.82–0.92) in the internal cohort and 0.86 (95%CI, 0.81–0.89) in the external cohort. The DeLong test revealed significance between this system and conventional scores in the test cohorts (p < 0.05). In the survival analysis, patients with higher risk were susceptible to exacerbation events.The DLS could allow accurate prediction of COPD exacerbations. The newly identified CT biomarkers (ALV/TLC ratio, VAT, and pectoralis muscle CSA) could potentially enable investigation into underlying mechanisms responsible for exacerbations.
定量计算机断层扫描(CT)分析是诊断和评估肺部疾病严重程度的重要方法。然而,CT 衍生的生物标志物与慢性阻塞性肺疾病(COPD)恶化之间的关系仍不清楚。在这项回顾性研究中,我们连续招募了慢性阻塞性肺病患者,并对他们的数据进行了分析。这项回顾性研究连续纳入了慢性阻塞性肺病患者,并对他们的数据进行了分析。根据胸部 CT 扫描结果分析了身体成分和胸廓异常。通过逻辑回归分析找出导致病情恶化的独立风险因素。根据两年的随访数据,开发了深度学习系统(DLS)来预测未来的病情加重。进行了接收者操作特征(ROC)曲线分析,以评估诊断性能。最后,进行了生存分析,以进一步评估 DLS 在风险分层方面的潜力。多变量分析显示,CT得出的高受影响肺容积/总肺活量(ALV/TLC)比值、高内脏脂肪组织面积(VAT)和低胸肌横截面积(CSA)是导致慢性阻塞性肺疾病加重的独立风险因素。在内部队列中,DLS 的 ROC (AUC) 值为 0.88(95%CI,0.82-0.92),在外部队列中为 0.86(95%CI,0.81-0.89),优于恶化史和体重指数、气流阻塞、呼吸困难和运动能力(BODE)指数。DeLong 检验显示,在测试队列中,该系统与传统评分之间存在显著性差异(P < 0.05)。在生存分析中,风险较高的患者容易发生病情加重事件。新发现的 CT 生物标记物(ALV/TLC 比值、VAT 和胸肌 CSA)可能有助于研究导致病情恶化的潜在机制。
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引用次数: 0
Case report: A healthy baby achieved after preimplantation genetic testing from an infertile woman with hereditary leiomyomatosis and renal cell cancer syndrome 病例报告:一位患有遗传性子宫肌腺症和肾细胞癌综合征的不孕妇女在植入前基因检测后获得了一个健康宝宝
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1400694
Qianhui Hu, Qing Zhang, Mengxi Guo, Hai-xia Ding, Ji Xi, Meiling Zhang, Min Wang, Lin Zhang, Shuyuan Li, Dandan Wu, Wen Li
Hereditary leiomyomatosis and renal cell cancer (HLRCC) is a rare autosomal dominant inheritable disease caused by Fumarate hydratase (FH) gene germline mutation. It is speculated that for HRLCC infertility women with multiple uterine leiomyomas, preimplantation genetic testing may help block transmission of mutated FH gene during pregnancy.We present the case of a 26-year-old nulligravida with a history of early-onset uterine leiomyomatosis had a heterozygous nonsense mutation [NM_000143.4 (FH): c.1027C > T(p.Arg343Ter)] in the HRLLC gene. After ovulation induction and in vitro fertilization, preimplantation genetic testing for monogenic disorders (PGT-M) on embryos revealed the absence of the pathogenic allele in two blastomeres. Uterine fibroids were identified before embryo transfer, leading to a submucosal myomectomy and long period of pituitary suppression by Gonadotropin-releasing hormone analog (GnRHa). The patient achieved a healthy live birth after the second cycle of frozen–thawed embryo transfer.This case details the successful treatment of an infertile patient with an HRLLC family history, resulting in a healthy birth through myomectomy and PGT-M selected embryo transplantation. Our literature search indicates the first reported live birth after HRLLC-PGT-M.
遗传性子宫白肌瘤病和肾细胞癌(HLRCC)是一种罕见的常染色体显性遗传病,由富马酸氢化酶(FH)基因种系突变引起。据推测,对于患有多发性子宫白肌瘤的 HRLCC 不孕症妇女来说,植入前基因检测可能有助于阻断变异 FH 基因在妊娠期间的传播。本病例中,一名 26 岁的无子宫妊娠妇女患有早发型子宫白肌瘤病史,其 HRLLC 基因存在杂合子无义突变 [NM_000143.4 (FH):c.1027C > T(p.Arg343Ter)] 。在诱导排卵和体外受精后,对胚胎进行了单基因遗传病植入前基因检测(PGT-M),发现两个胚泡中没有致病等位基因。在胚胎移植前发现了子宫肌瘤,因此进行了粘膜下肌瘤切除术,并通过促性腺激素释放激素类似物(GnRHa)对垂体进行了长期抑制。本病例详细介绍了对一名有 HRLLC 家族史的不孕患者的成功治疗,通过肌瘤切除术和 PGT-M 精选胚胎移植,患者获得了健康的新生儿。我们的文献检索结果表明,HRLLC-PGT-M 术后活产的报道尚属首次。
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引用次数: 0
Optimizing sedation in gastroscopy: a study on the etomidate/propofol mixture ratio 胃镜检查中的镇静优化:关于依托咪酯/丙泊酚混合物比例的研究
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1392141
Shuyi Tang, Yuling Zheng, Xiaoling Li, Yiwen Zhang, Zhongqi Zhang
Propofol and etomidate are the most commonly used sedative agents in procedural sedation, each with its own advantages and disadvantages. However, there remains considerable controversy regarding the optimal ratio for the mixture of these two drugs, warranting further investigation. Therefore, this study aims to investigate the optimal ratio for combining propofol and etomidate during gastroscopy.This study is a prospective, double-blinded, randomized controlled clinical trial. One hundred and sixty-two patients from July 2019 to December 2022 were evenly classified into three groups using a random number table as follows: (1) P group (propofol); (2) EP1 group (5 mL etomidate +10 mL propofol); (3) EP2 group (10 mL etomidate +10 mL), 54 patients per group. The medications, including a pre-sedation dose of 50 μg/kg dezocine followed by sedatives, ceasing when the patient’s eyelash reflex vanished, indicating adequate sedation. Mean arterial pressure (MAP), heart rate (HR), and peripheral oxygen saturation (SpO2) measurements taken before anesthesia (T1), immediately after the administration of sedatives (T2), immediately gastroscopic insertion (T3) and immediately recovery (T4) were determined. Additional, perioperative related outcomes and adverse events were also recorded.The EP2 group exhibited a higher MAP at T2 compared to the P and EP1 groups (p < 0.05). Calculated decreases in MAP revealed values of 19.1, 18.8, and 13.8% for the P, EP1, and EP2 groups at T2, respectively. Adverse events: Group EP2 exhibited a significantly lower hypotension incidence (11.1%) compared to the Propofol group (50%) and EP1 (31.5%). Concerning injection pain, Group EP2 also showing a significant decrease in comparison to P and EP1 groups (p < 0.05).The use of a mixture of 10 mL etomidate and 10 mL propofol (at a 1:1 ratio) combined with dezocine for painless gastroscopy demonstrates hemodynamic stability, a low incidence of adverse reactions.https://www.chictr.org.cn/showproj.html?proj=39874
丙泊酚和依托咪酯是手术镇静中最常用的镇静剂,各有利弊。然而,关于这两种药物混合使用的最佳比例仍存在相当大的争议,值得进一步研究。因此,本研究旨在探讨胃镜检查时丙泊酚和依托咪酯的最佳混合比例。本研究是一项前瞻性、双盲、随机对照临床试验。采用随机数字表将2019年7月至2022年12月的162例患者平均分为以下三组:(1)P组(丙泊酚);(2)EP1组(5 mL依托咪酯+10 mL丙泊酚);(3)EP2组(10 mL依托咪酯+10 mL),每组54名患者。用药包括镇静前服用 50 μg/kg 地佐辛,然后服用镇静剂,当患者睫毛反射消失时停止用药,表明镇静充分。测定了麻醉前(T1)、使用镇静剂后立即(T2)、插入胃镜后立即(T3)和恢复后立即(T4)的平均动脉压(MAP)、心率(HR)和外周血氧饱和度(SpO2)。与 P 组和 EP1 组相比,EP2 组在 T2 时的 MAP 更高(p < 0.05)。计算发现,P组、EP1组和EP2组在T2时的MAP下降值分别为19.1%、18.8%和13.8%。不良事件:EP2 组的低血压发生率(11.1%)明显低于异丙酚组(50%)和 EP1 组(31.5%)。在注射疼痛方面,EP2 组与 P 组和 EP1 组相比也有显著下降(p < 0.05)。使用 10 毫升依托咪酯和 10 毫升丙泊酚(比例为 1:1)的混合物结合地佐辛进行无痛胃镜检查显示了血流动力学的稳定性和较低的不良反应发生率。https://www.chictr.org.cn/showproj.html?proj=39874。
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引用次数: 0
Protection from prior natural infection vs. vaccination against SARS-CoV-2—a statistical note to avoid biased interpretation 先前自然感染与接种疫苗对 SARS-CoV-2 的保护作用--避免偏颇解释的统计说明
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1376275
S. Weber, Pontus Hedberg, P. Nauclér, Martin Wolkewitz
The fight against SARS-CoV-2 has been a major task worldwide since it was first identified in December 2019. An imperative preventive measure is the availability of efficacious vaccines while there is also a significant interest in the protective effect of a previous SARS-CoV-2 infection on a subsequent infection (natural protection rate).In order to compare protection rates after infection and vaccination, researchers consider different effect measures such as 1 minus hazard ratio, 1 minus odds ratio, or 1 minus risk ratio. These measures differ in a setting with competing risks. Nevertheless, as there is no unique definition, these metrics are frequently used in studies examining protection rate. Comparison of protection rates via vaccination and natural infection poses several challenges. For instance many publications consider the epidemiological definition, that a reinfection after a SARS-CoV-2 infection is only possible after 90 days, whereas there is no such constraint after vaccination. Furthermore, death is more prominent as a competing event during the first 90 days after infection compared to vaccination. In this work we discuss the statistical issues that arise when investigating protection rates comparing vaccination with infection. We explore different aspects of effect measures and provide insights drawn from different analyses, distinguishing between the first and the second 90 days post-infection or vaccination.In this study, we have access to real-world data of almost two million people from Stockholm County, Sweden. For the main analysis, data of over 52.000 people is considered. The infected group is younger, includes more men, and is less morbid compared to the vaccinated group. After the first 90 days, these differences increased. Analysis of the second 90 days shows differences between analysis approaches and between age groups. There are age-related differences in mortality. Considering the outcome SARS-CoV-2 infection, the effect of vaccination versus infection varies by age, showing a disadvantage for the vaccinated in the younger population, while no significant difference was found in the elderly.To compare the effects of immunization through infection or vaccination, we emphasize consideration of several investigations. It is crucial to examine two observation periods: The first and second 90-day intervals following infection or vaccination. Additionally, methods to address imbalances are essential and need to be used. This approach supports fair comparisons, allows for more comprehensive conclusions and helps prevent biased interpretations.
自 2019 年 12 月首次发现 SARS-CoV-2 以来,抗击 SARS-CoV-2 一直是全世界的一项重要任务。一项必要的预防措施是提供有效的疫苗,同时,人们也非常关注之前感染过 SARS-CoV-2 对之后感染的保护作用(自然保护率)。为了比较感染后和接种疫苗后的保护率,研究人员考虑了不同的效果衡量标准,如 1 减危险比、1 减几率比或 1 减风险比。在存在竞争风险的情况下,这些衡量标准有所不同。不过,由于没有唯一的定义,这些指标经常被用于研究保护率。比较疫苗接种和自然感染的保护率会带来一些挑战。例如,许多出版物考虑了流行病学的定义,即感染 SARS-CoV-2 后只能在 90 天后再次感染,而接种疫苗后则没有这种限制。此外,与接种疫苗相比,在感染后的前 90 天内,死亡作为一种竞争事件更为突出。在这项工作中,我们讨论了在调查疫苗接种与感染相比的保护率时出现的统计问题。在这项研究中,我们获得了瑞典斯德哥尔摩县近 200 万人的真实数据。在主要分析中,我们考虑了 52000 多人的数据。与接种疫苗的人群相比,感染人群更年轻,男性更多,发病率更低。在最初的 90 天后,这些差异有所扩大。对后 90 天的分析显示了不同分析方法和不同年龄组之间的差异。死亡率的差异与年龄有关。考虑到 SARS-CoV-2 感染的结果,接种疫苗与感染的效果因年龄而异,在年轻人群中接种疫苗者处于劣势,而在老年人群中则没有发现明显差异。对两个观察期进行研究至关重要:感染或接种后的第一个和第二个 90 天间隔期。此外,解决不平衡问题的方法也至关重要,必须加以使用。这种方法有助于进行公平的比较,得出更全面的结论,并有助于防止有偏见的解释。
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引用次数: 0
Acute-on-chronic: using magnetic resonance imaging to disentangle the haemodynamic responses to acute and chronic fetal hypoxaemia 急性-慢性:利用磁共振成像区分胎儿对急性和慢性低氧血症的血流动力学反应
Pub Date : 2024-06-12 DOI: 10.3389/fmed.2024.1340012
J. Darby, B. Saini, S. Holman, Sarah J. Hammond, S. Perumal, C. Macgowan, Mike Seed, Janna L. Morrison
The fetal haemodynamic response to acute episodes of hypoxaemia are well characterised. However, how these responses change when the hypoxaemia becomes more chronic in nature such as that associated with fetal growth restriction (FGR), is less well understood. Herein, we utilised a combination of clinically relevant MRI techniques to comprehensively characterize and differentiate the haemodynamic responses occurring during acute and chronic periods of fetal hypoxaemia.Prior to conception, carunclectomy surgery was performed on non-pregnant ewes to induce FGR. At 108–110 days (d) gestational age (GA), pregnant ewes bearing control (n = 12) and FGR (n = 9) fetuses underwent fetal catheterisation surgery. At 117–119 days GA, ewes underwent MRI sessions where phase-contrast (PC) and T2 oximetry were used to measure blood flow and oxygenation, respectively, throughout the fetal circulation during a normoxia and then an acute hypoxia state.Fetal oxygen delivery (DO2) was lower in FGR fetuses than controls during the normoxia state but cerebral DO2 remained similar between fetal groups. Acute hypoxia reduced both overall fetal and cerebral DO2. FGR increased ductus venosus (DV) and foramen ovale (FO) blood flow during both the normoxia and acute hypoxia states. Pulmonary blood flow (PBF) was lower in FGR fetuses during the normoxia state but similar to controls during the acute hypoxia state when PBF in controls was decreased.Despite a prevailing level of chronic hypoxaemia, the FGR fetus upregulates the preferential streaming of oxygen-rich blood via the DV-FO pathway to maintain cerebral DO2. However, this upregulation is unable to maintain cerebral DO2 during further exposure to an acute episode of hypoxaemia. The haemodynamic alterations required at the level of the liver and lung to allow the DV-FO pathway to maintain cerebral DO2, may have lasting consequences on hepatic function and pulmonary vascular regulation after birth.
胎儿对急性低氧血症的血流动力学反应已被充分描述。然而,当低氧血症转变为慢性低氧血症(如与胎儿生长受限(FGR)相关的低氧血症)时,这些反应会如何变化,目前还不太清楚。在本文中,我们综合利用了临床相关的磁共振成像技术,全面描述并区分了胎儿低氧血症急性期和慢性期的血流动力学反应。在受孕前,对非怀孕母羊进行了诱导FGR的阉割手术。在胎龄108-110天(d)时,怀有对照胎儿(n = 12)和FGR胎儿(n = 9)的怀孕母羊接受了胎儿导管手术。在正常缺氧和急性缺氧状态下,FGR 胎儿的胎儿氧输送量(DO2)低于对照组,但不同胎儿组之间的大脑 DO2 保持相似。急性缺氧会降低胎儿和大脑的总氧气输送量(DO2)。在正常缺氧和急性缺氧状态下,FGR 会增加静脉导管(DV)和卵圆孔(FO)的血流量。在正常缺氧状态下,FGR 胎儿的肺血流(PBF)较低,但在急性缺氧状态下,FGR 胎儿的肺血流(PBF)与对照组相似,而对照组的肺血流(PBF)则下降。然而,在进一步暴露于急性低氧血症时,这种上调无法维持脑血氧饱和度。为了让 DV-FO 途径维持脑溶解氧,需要在肝脏和肺的水平上改变血流动力学,这可能会对出生后的肝功能和肺血管调节产生持久的影响。
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Frontiers in Medicine
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