delayed diagnosis

延迟诊断
  • 文章类型: Journal Article
    由于诊断延迟,卵巢癌(OC)仍然是全球最致命的妇科恶性肿瘤,复发,和抗药性。本研究旨在确定影响OC患者延迟诊断的关键因素。
    对在太和医院接受治疗的OC患者进行了回顾性分析,湖北医药学院,2023年6月至2023年9月。根据延迟诊断的三个月截止点对患者进行分类。收集的数据包括人口统计,肿瘤发病率,和疾病认知。组间比较采用方差分析和卡方检验。
    年龄差异显著,residence,教育水平,家庭收入,肿瘤家族史,组织学,FIGO阶段,肿瘤部位组间比较(P<0.05)。多因素logistic回归分析确定了教育水平[优势比(OR)=0.606;95%置信区间(CI):0.440,0.833;P=0.002],肿瘤家族史(OR=0.462;95%CI:0.214,0.997;P=0.049),情绪障碍(OR=1.332;95%CI:1.081,1.642;P=0.007),和实际障碍(OR=2.964;95%CI:2.195,4.004;P<0.001)是OC延迟诊断的危险因素。
    患者认知在OC诊断延迟中至关重要。提高公众对OC的认识和理解对于消除恐惧和改善早期诊断至关重要。
    UNASSIGNED: Ovarian cancer (OC) remains the deadliest gynecologic malignancy worldwide due to delayed diagnosis, recurrence, and drug resistance. This study aimed to identify key factors affecting delayed diagnosis in OC patients.
    UNASSIGNED: A retrospective analysis was conducted on OC patients treated at Taihe Hospital, Hubei University of Medicine from June 2023 to September 2023. Patients were categorized based on a three-months cut-off point for delayed diagnosis. Collected data included demographics, tumor incidence, and disease cognition. The analysis of variance and the chi-squared test was used for comparison between groups.
    UNASSIGNED: The significant differences were found in age, residence, education level, family income, family history of tumor, histology, FIGO stage, and tumor location between groups (P<0.05). Multifactorial logistic regression analysis identified education level [odds ratio (OR) = 0.606; 95% confidence interval (CI): 0.440, 0.833; P = 0.002], family history of tumor (OR = 0.462; 95% CI: 0.214, 0.997; P = 0.049), emotional barriers (OR = 1.332; 95% CI: 1.081, 1.642; P = 0.007), and practical barriers (OR = 2.964; 95% CI: 2.195, 4.004; P < 0.001) as risk factors for delayed diagnosis of OC.
    UNASSIGNED: Patient cognition is crucial in OC diagnosis delay. Enhancing public awareness and understanding of OC is essential to eliminate fear and improve early diagnosis.
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  • 文章类型: Journal Article
    人格解体/脱实障碍(DPD)是一种普遍但未充分理解的临床疾病,其特征是反复或持续的不现实感。这项研究旨在通过涉及大量中国参与者的描述性和比较分析来提供对DPD的见解。社会人口统计细节(年龄,性别比例,教育,职业状况,婚姻状况),去个性化和分离症状特征(剑桥去个性化量表和分离体验量表的症状因素或分量表),发展轨迹(发病年龄,潜在的诱发因素,课程特点),治疗史(延迟就诊的持续时间,延迟诊断的持续时间,以前的诊断),并介绍了DPD患者的不良童年经历。比较焦虑和抑郁症状,除了心理社会功能,在DPD参与者和被诊断为广泛性焦虑症的参与者之间,双相情感障碍,并进行了重度抑郁症。分析强调了男性较高的优势和DPD的早期发作,以失实为标志的症状学,心理社会功能明显受损,以及与症状严重程度相关的长时间延迟就诊和诊断。此外,我们发现了不良儿童经历与症状水平之间值得注意的关系.研究结果证实了DPD是一种严重但被忽视的精神障碍的观点,敦促采取措施改善DPD患者的现状。
    Depersonalization/derealization disorder (DPD) is a prevalent yet inadequately understood clinical condition characterized by a recurrent or persistent sense of unreality. This study aims to provide insight into DPD through descriptive and comparative analyses involving a large group of Chinese participants. The socio-demographic details (age, gender proportion, education, occupational status, marital status), depersonalized and dissociative symptom characteristics (symptomatic factors or subscales of the Cambridge Depersonalization Scale and the Dissociative Experiences Scale), development trajectory (age of onset, potential precipitating factors, course characteristics), treatment history (duration of delayed healthcare attendance, duration of delayed diagnosis, previous diagnoses), and adverse childhood experiences of the DPD patients are presented. Comparisons of anxiety and depressive symptoms, alongside psychosocial functioning, between DPD participants and those diagnosed with generalized anxiety disorder, bipolar disorders, and major depressive disorder were conducted. The analysis highlights a higher male preponderance and early onset of DPD, symptomatology marked by derealization, notable impairment in psychosocial functioning, and prolonged periods of delayed healthcare attendance and diagnosis associated with symptom severity. Furthermore, noteworthy relationships between adverse childhood experiences and symptom levels were identified. The findings substantiate the view that DPD is a serious but neglected mental disorder, urging initiatives to improve the current condition of DPD patients.
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  • 文章类型: Journal Article
    对肺结核(PTB)的空间延迟研究较少。在这项研究中,共纳入151,799例通报的PTB病例,患者中位数和诊断延迟为15[四分位距(IOR),4-35]和2(IOR,0-8)天,分别。使用空间自相关分析和时空扫描统计来确定聚类,这表明浙江省西南部和东北部的地区表现出很高的长期患者延迟率(LPD,延迟≥15天)和长期诊断延迟(LDD,延迟≥2天)。此外,Mantel检验显示2018年公众对可疑症状的知晓率与LPD呈中度正相关(Mantel'sr=0.4,P<0.05).这些发现表明,PTB延迟可以揭示公共卫生教育和医疗保健系统的缺陷。此外,探索将PTB知识转变为态度和行为的真实变化以最大程度地减少患者延误的方法至关重要。解决这些问题对于改善浙江省与PTB相关的公共卫生结果至关重要。
    The spatial delays of pulmonary tuberculosis (PTB) have been less explored. In this study, a total of 151,799 notified PTB cases were included, with median patient and diagnostic delays of 15 [interquartile range (IOR), 4-35] and 2 (IOR, 0-8) days, respectively. The spatial autocorrelation analysis and spatial-temporal scan statistics were used to determine the clusters, indicating that the regions in the southwestern and northeastern parts of Zhejiang Province exhibited high rates of long-term patient delay (LPD, delay ≥ 15 days) and long-term diagnostic delay (LDD, delay ≥ 2 days). Besides, the Mantel test indicated a moderately positive correlation between public awareness of suspicious symptoms and the LPD rate in 2018 (Mantel\'s r = 0.4, P < 0.05). These findings suggest that PTB delays can reveal deficiencies in public health education and the healthcare system. Also, it is essential to explore methods to shift PTB knowledge towards real changes in attitude and behavior to minimize patient delay. Addressing these issues will be crucial for improving public health outcomes related to PTB in Zhejiang Province.
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  • 文章类型: Case Reports
    背景:戈谢病(GD)是一种罕见的遗传性溶酶体贮积症,疾病进展和不适当的治疗。然而,并非所有GD患者都能得到及时的诊断和治疗。
    方法:早期诊断对于开始正确治疗和预防并发症很重要。
    方法:本研究中2例确诊为GD。
    结果:这2例患者接受了亚胺酶替代治疗,随访后症状明显改善。
    结论:此处,我们报告了2例延迟诊断GD的患者,以提高对罕见疾病的认识并改善教育。然而,非侵入性β-葡萄糖脑苷脂酶活性或GBA基因检测在骨髓穿刺之前没有进行过,这是无创和可靠的测试,表明GD的诊断。
    BACKGROUND: Gaucher disease (GD) is a rare hereditary lysosomal storage disorder disease progression and inappropriate treatment. However, not all patients with GD receive timely diagnosis and treatment.
    METHODS: Early diagnosis is important for initiating proper treatment and preventing complications.
    METHODS: Two patients were diagnosed as GD in this study.
    RESULTS: These 2 patients received the imiglucerase enzyme replacement and symptoms significantly improved by the follow-up.
    CONCLUSIONS: Herein, we report 2 patients with a delayed diagnosis of GD to increase awareness and improve education regarding rare diseases. However, noninvasive β-glucocerebrosidase activity or GBA gene testing had not been done before bone marrow aspiration, which are the noninvasive and reliable tests that indicate the diagnosis of GD.
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  • 文章类型: Journal Article
    这项研究调查了血清白蛋白浓度与中国晚期诊断的HIV/AIDS12周死亡率之间的关系。这项回顾性队列研究包括,2018年1月至2021年12月期间,1079名住院患者诊断为晚期HIV/AIDS。根据12周死亡率估计疾病进展。Cox比例风险回归模型用于评估血清白蛋白水平与疾病进展之间的关系。通过Kaplan-Meier曲线估计血清白蛋白水平对死亡率的影响。调整后血清白蛋白每增加1g/L,死亡风险降低7%([HR]=0.93,95%CI:0.88-0.97)。与低(<28g/L)血清白蛋白组相比,中等(28-34g/L)组的死亡风险降低了70%(HR=0.30,95%CI:0.15-0.59),调整后,高(≥34g/L)组下降了40%(HR=0.6,95%CI:0.29-1.23)。我们的发现表明,在晚期AIDS/HIV诊断患者中,入院时血清白蛋白水平的升高与出院后12周死亡率的降低之间呈正相关。需要进一步的研究来表征血清白蛋白在晚期诊断患者12周死亡率预防中的作用。
    This study investigated the association between serum albumin concentration and 12-weeks mortality of HIV/AIDS with late diagnosis in China. This retrospective cohort study included, 1079 inpatients diagnosis with late HIV/AIDS between January 2018 and December 2021. Disease progression was estimated based on the 12-weeks mortality rate. Cox proportional hazards regression models were used to evaluate the relationship between serum albumin levels and disease progression. The effects of serum albumin levels on mortality was estimated via Kaplan-Meier curves. The mortality risk decreased by 7% with every 1 g/L increase in serum albumin after adjustment ([HR] = 0.93, 95% CI: 0.88-0.97). Compared with that of the low (< 28 g/L) serum albumin group, the middle (28-34 g/L) group\'s mortality risk decreased by 70% (HR = 0.30, 95% CI: 0.15-0.59), and that of the high (≥ 34 g/L) group decreased by 40% (HR = 0.6, 95% CI: 0.29-1.23) after adjustment. Our findings suggest a positive correlation between the increase in serum albumin levels upon admission and a decrease in mortality at 12 weeks post-discharge among patients with late AIDS/HIV diagnosis. Further research is needed to characterize the role of serum albumin in 12-weeks mortality prevention in patients with a late diagnosis.
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  • 文章类型: Journal Article
    背景:TAFRO综合征是一种全身性炎症性疾病,表现为血小板减少症(t),anasarca(a),发烧(f),网织蛋白骨髓纤维化/肾功能不全(r),和器官肿大(o),并被认为是特发性多中心Castleman病(iMCD)的独特临床亚型。这种综合征引起的临床表现类似于结缔组织疾病或自身免疫性疾病。
    方法:一名中国年轻女性,最初表现为关节痛,雷诺现象,全身性水肿,抗小核核糖核蛋白颗粒抗体阳性被诊断为混合性结缔组织病。肾活检显示血栓性微血管病变。骨髓涂片显示骨髓增生,活检提示怀疑轻链限制性表达,巨核细胞增殖,和中度至重度骨髓纤维化。进行了淋巴结活检,组织病理学发现与混合型Castleman病的亚型一致。常规化疗后临床症状缓解。
    方法:经过以上检查结果和临床表现,最终诊断为TAFRO综合征.
    方法:她开始用硼替佐米化疗,环磷酰胺,还有地塞米松.
    结果:化疗后,血小板减少症等症状,血尿和蛋白尿消失,淋巴结肿大和VEGF水平下降,骨髓纤维化缓解。
    结论:我们的病例说明了第一例混合性结缔组织病和iMCD-TAFRO综合征的共同特征。细胞因子可能在iMCD-TAFRO综合征和全身性自身免疫性疾病的共同致病性中起作用。直接针对炎症因子如糖皮质激素或化疗的治疗具有重要的治疗意义。
    BACKGROUND: TAFRO syndrome is a systemic inflammatory disorder, manifesting as thrombocytopenia (t), anasarca (a), fever (f), reticulin myelofibrosis/renal insufficiency (r), and organomegaly (o), and considered as a unique clinical subtype of idiopathic multicentric Castleman disease (iMCD). Such syndrome gave rise to a clinical picture similar to that of either a connective tissue disease or an autoimmune disease.
    METHODS: A Chinese young female initially presenting with arthralgia, Raynaud phenomenon, generalized edema, and a positive anti-small nuclear ribonucleoprotein particle antibody was diagnosed as mixed connective tissue disease. The kidney biopsy showed thrombotic microangiopathy. Bone marrow smear showed bone marrow hyperplasia and biopsy revealed suspected light chain restricted expression, megakaryocyte proliferation, and moderate to severe bone marrow fibrosis. A lymph node biopsy was conducted and the histopathological findings were consistent with the subtype of mixed Castleman disease. The clinical symptoms were relieved after regular chemotherapy.
    METHODS: After above examination results and clinical manifestations, the final diagnoses was TAFRO syndrome.
    METHODS: The she was started on chemotherapy with bortezomib, cyclophosphamide, and dexamethasone.
    RESULTS: After chemotherapy, symptoms such as thrombocytopenia, hematuria and proteinuria disappeared, lymphadenopathy and VEGF level decreased, and bone marrow fibrosis relieved.
    CONCLUSIONS: Our case illustrated the first cases of shared characteristics of mixed connective tissue disease and iMCD-TAFRO syndrome. Cytokines may play a role in the shared pathogenicity of the iMCD-TAFRO syndrome and systemic autoimmune diseases. Therapy directly against inflammatory factors such as corticosteroids or chemotherapy have an important therapeutic implication.
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  • 文章类型: Journal Article
    我们进行了一项回顾性研究,以调查2013年至2022年浙江省儿童肺结核患者中结核病寻求延迟和诊断延迟的危险因素。在1274个案例中,49.61%的人经历了结核病护理寻求延迟(从症状发作到首次住院>14天),14.91%的人面临诊断延迟(从初次咨询到诊断>14天)。就诊延误比例由37.42至64.89%不等,而诊断延迟从6.11波动到21.02%。城市住宅(OR=0.78,95%CI0.62-0.98,P=0.030),首次访问市级医院(OR=0.57,95%CI0.45-0.72,P<0.001),和诊断方法(OR=0.66,95CI0.52-0.84,P<0.001)与结核病寻求延迟相关,而首次就诊市级医院(OR=2.05,95%CI1.49-2.80,P<0.001)与诊断延迟有关.使用28天截止点的进一步分析显示,0-4岁的儿童,那些来自移民人口的人,实验室确诊的患者,那些第一次去县级医院的人更有可能在寻求结核病治疗方面遇到延误。因此,社会应该更加关注农村的健康,移民,和0-4岁的孩子,因为他们有更高的风险经历结核病护理的延误。
    We conducted a retrospective study to investigate risk factors for tuberculosis care-seeking delay and diagnostic delays among pediatric pulmonary tuberculosis cases in Zhejiang Province from 2013 to 2022. Among 1274 cases, 49.61% experienced tuberculosis care-seeking delays (> 14 days from symptom onset to first hospital visit) and 14.91% faced diagnostic delays (> 14 days from initial consultation to diagnosis). The proportion of care-seeking delays ranged from 37.42 to 64.89%, while diagnostic delay fluctuated from 6.11 to 21.02%. Urban residence (OR = 0.78, 95% CI 0.62-0.98, P = 0.030), first visiting a municipal-level hospital (OR = 0.57, 95% CI 0.45-0.72, P < 0.001), and diagnostic method (OR = 0.66, 95%CI 0.52-0.84, P < 0.001) were associated with tuberculosis care-seeking delay, whereas first visiting a municipal-level hospital (OR = 2.05, 95% CI 1.49-2.80, P < 0.001) was linked to diagnostic delay. Further analysis using a 28-day cutoff point revealed that children aged 0-4 years, those from migrant populations, laboratory-confirmed patients, and those who first visited a county-level hospital were more likely to experience delays in seeking tuberculosis care. Thus, society should pay more attention to the health of rural, migrant, and 0-4-year-old children, as they are at higher risk of experiencing tuberculosis care-seeking delays.
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  • 文章类型: Journal Article
    在患有颅内生殖细胞肿瘤(iGCT)的个体中,延迟诊断对肿瘤相关预后的影响似乎很小。然而,其对神经内分泌功能的影响尚不清楚.我们旨在评估延迟诊断对鞍上GCT患者神经内分泌功能的影响。
    我们对459例鞍上GCT患者进行了一项回顾性队列研究,并根据疾病持续时间将其分为两组:延迟诊断(>6个月)和非延迟诊断(≤6个月)。我们比较了内分泌症状,神经内分泌功能障碍及其分级(根据严重程度分为0-3级),和神经内分泌功能障碍的恢复。
    延迟诊断的患者表现出更高的闭经发生率,生长缓慢,疲劳,和多尿/多饮。神经内分泌功能障碍,包括中枢肾上腺功能不全(CAI),中枢甲状腺功能减退症(CHT),精氨酸加压素缺乏症(AVP-D),生长激素缺乏,性腺功能减退,和高催乳素血症,在诊断时延迟诊断组中更为明显,治疗结束,和最后的后续行动。此外,延迟诊断的个体在诊断时表现出更高的神经内分泌功能障碍等级(OR=3.005,95%CI1.929-4.845,p<0.001),肿瘤治疗结束(OR=4.802,95%CI2.878-8.004,p<0.001),校正混杂因素后的最后一次随访(OR=2.335,95%CI1.307-4.170,p=0.005)。最后,复苏较少,特别是在CAI中,CHT,和AVP-D,在治疗后延迟诊断的组中观察到。
    在患有鞍上GCT的个体中,延迟诊断与增加有关,更严重,神经内分泌功能障碍恢复较少,强调早期诊断和治疗以减少神经内分泌功能障碍的重要性。
    UNASSIGNED: The impact of delayed diagnosis on tumor-related prognosis appears to be minimal in individuals with intracranial germ cell tumors (iGCTs). However, its effect on neuroendocrine functions remains unclear. We aimed to assess the effects of delayed diagnosis on neuroendocrine function in individuals with suprasellar GCTs.
    UNASSIGNED: We conducted a retrospective cohort study of 459 individuals with suprasellar GCTs and categorized them into two groups based on disease duration: delayed diagnosis (> 6 months) and non-delayed diagnosis (≤ 6 months). We compared endocrinological symptoms, neuroendocrine dysfunction and its grading (categorized into 0-3 grades based on severity), and recovery from neuroendocrine dysfunction in both groups.
    UNASSIGNED: Patients with delayed diagnosis exhibited higher incidences of amenorrhea, slow growth, fatigue, and polyuria/polydipsia. Neuroendocrine dysfunction, including central adrenal insufficiency (CAI), central hypothyroidism (CHT), arginine vasopressin deficiency (AVP-D), growth hormone deficiency, hypogonadism, and hyperprolactinemia, was more pronounced in the delayed diagnosis group at diagnosis, the end of treatment, and the last follow-up. Furthermore, individuals with delayed diagnosis showed higher grades of neuroendocrine dysfunction at diagnosis (OR=3.005, 95% CI 1.929-4.845, p<0.001), end of oncologic treatment (OR=4.802, 95% CI 2.878-8.004, p<0.001), and last follow-up(OR=2.335, 95% CI 1.307-4.170, p=0.005) after adjusting for confounders. Finally, less recovery, particularly in CAI, CHT, and AVP-D, was seen among the group with delayed diagnosis after treatment.
    UNASSIGNED: Among individuals with suprasellar GCTs, delayed diagnosis is associated with increased, more severe, and less recovered neuroendocrine dysfunction, emphasizing the importance of early diagnosis and treatment to reduce neuroendocrine dysfunction.
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  • 文章类型: Journal Article
    背景:Q发烧,由人畜共患病原体伯氏杆菌引起,表现出世界性流行。在中国,Q发烧不被认为是应报告的疾病,这种疾病在临床实践中被忽视和低估,导致诊断挑战。
    方法:我们介绍了在2022年至2023年之间诊断为持续Q热的3例患者的病例系列。我们三例病例的平均年龄为63.33岁,由两名男性和一名女性组成。这些人的病史包括以前的瓣膜置换,动脉瘤,然后进行主动脉支架植入术和人工髋关节置换。在疾病发作时,只有一例出现急性发热,其余两例无任何急性症状。病因最初被忽略,直到宏基因组下一代测序测试从血液或活检样本中鉴定出伯氏柯西氏菌。发现诊断延迟,从疾病发作到确认之间的持续时间从三个月到一年不等。流行病学史发现,这三例病例均未直接接触家畜或食用未经巴氏消毒的乳制品。案例1和2居住在城市地区,而案例3是一名从事农业的农村居民。所有患者均接受多西环素和羟氯喹联合治疗,并且在随访期间没有观察到该疾病的复发。
    结论:Q发热在我国临床实践中很少被诊断和报道。我们应该意识到高危人群中持续的Q热,即使有平淡无奇的曝光历史。宏基因组下一代测序作为一种诊断工具,具有巨大的潜力,可用于识别稀有和挑剔的病原体,例如柯西氏菌。
    BACKGROUND: Q fever, caused by the zoonotic pathogen Coxiella burnetii, exhibits a worldwide prevalence. In China, Q fever is not recognized as a notifiable disease, and the disease is overlooked and underestimated in clinical practice, leading to diagnostic challenges.
    METHODS: We present a case series of three patients diagnosed with persistent Q fever between 2022 and 2023. The average age of our three cases was 63.33 years old, consisting of two males and one female. The medical history of the individuals included previous valve replacement, aneurysm followed by aortic stent-graft placement and prosthetic hip joint replacement. At the onset of the disease, only one case exhibited acute fever, while the remaining two cases were devoid of any acute symptoms. The etiology was initially overlooked until metagenomic next-generation sequencing test identified Coxiella burnetii from the blood or biopsy samples. Delayed diagnosis was noted, with a duration ranging from three months to one year between the onset of the disease and its confirmation. The epidemiological history uncovered that none of the three cases had direct exposure to domestic animals or consumption of unpasteurized dairy products. Case 1 and 2 resided in urban areas, while Case 3 was a rural resident engaged in farming. All patients received combination therapy of doxycycline and hydroxychloroquine, and no recurrence of the disease was observed during the follow-up period.
    CONCLUSIONS: Q fever is rarely diagnosed and reported in clinical practice in our country. We should be aware of persistent Q fever in high-risk population, even with unremarkable exposure history. Metagenomic next-generation sequencing holds great potential as a diagnostic tool for identifying rare and fastidious pathogens such as Coxiella burnetii.
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  • 文章类型: Journal Article
    背景:粘多糖贮积症IVA(MPSIVA)是由N-乙酰半乳糖胺-6-硫酸酯酶(GALNS)基因的双等位基因变体引起的溶酶体贮积病,其特征是进行性和多系统受累,主要有骨骼畸形。MPSIVA的轻度形式通常表现为非典型症状,并且可能多年未被识别。
    方法:通过白细胞中的GALNS酶活性测试确认MPSIVA的诊断。收集临床特征。通过GALNS基因的下一代序列和Sanger测序进行分子分析。通过mRNA分析验证了深内含子变体的致病性。
    结果:纳入了来自6个家庭的13例轻度MPSIVA患者。所有先证者首先访问儿科骨科医生,并且在疾病发作后花了5.6年的时间才被诊断出来。我们系列中最常见的症状是蹒跚步态(85%),短颈(69%)和扁平足(62%)。放射学检查显示所有患者的骨骼异常,特别是椎体的修改(100%)和髋臼和股骨头发育不良(100%)。五个新颖的GALNS变体,包括c.121-2_121-1inTTTGCTGGCATATGCA,E2删除,c.569A>G,c.898+2T>A,c.1139+2T>C,已确定。最常见的变体,深内含子变异体NM_000512.5:c.121-210C>T(NM_001323544.2:c.129C>T,p.G43G),显示导致11bp缺失(c.128_138delGCGATGCTGAG,p.Gly43Aspfs*5)在NM_001323544.2的GALNS转录物中的GALNSmRNA上。
    结论:这项研究提供了对有助于轻度MPSIVA早期诊断的临床特征和分子特征的重要见解。根据我们的队列,骨科医生需要能够识别轻度MPSIVA的体征和症状以及分子和生化诊断,以便早期诊断和治疗。
    BACKGROUND: Mucopolysaccharidosis IVA (MPS IVA) is a lysosomal storage disease caused by biallelic variants in the N-acetylgalactosamine-6-sulfatase (GALNS) gene and is characterized by progressive and multi-system involvements, dominantly with skeletal deformities. A mild form of MPS IVA often presents with atypical symptoms and can go unrecognized for years.
    METHODS: The diagnosis of MPS IVA was confirmed via GALNS enzyme activity testing in leukocytes. Clinical features were collected. Molecular analysis was performed by next generation sequence and Sanger sequencing of the GALNS gene. The pathogenicity of the deep intron variant was verified by mRNA analyses.
    RESULTS: Thirteen patients with mild MPS IVA from six families were included. All probands first visit pediatric orthopedists and it took 5.6 years to be diagnosed after the disease onset. The most common symptoms in our series were waddling gait (85%), short neck (69%) and flat feet (62%). Radiologic findings indicated skeletal abnormalities in all patients, especially modification of the vertebral bodies (100%) and acetabular and femoral head dysplasia (100%). Five novel GALNS variants, including c.121-2_121-1insTTTGCTGGCATATGCA, E2 deletion, c.569 A > G, c.898 + 2 T > A, and c.1139 + 2 T > C, were identified. The most common variant, a deep intron variant NM_000512.5: c.121-210 C > T (NM_001323544.2: c.129 C > T, p.G43G), was revealed to result in an 11 bp deletion (c.128_138delGCGATGCTGAG, p.Gly43Aspfs*5) on GALNS mRNA in the GALNS transcript of NM_001323544.2.
    CONCLUSIONS: This study provides significant insights into the clinical features and molecular characteristics that contribute to the early diagnosis of mild MPS IVA. On the basis of our cohort, orthopedists need to be able to recognize signs and symptoms of mild MPS IVA as well as the molecular and biochemical diagnosis so that an early diagnosis and treatment can be instituted.
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