In cardiac ablation procedures,the accuracy of catheter positioning determines the authenticity of the cardiac model and the accuracy of the ablation target.This article reviews the literature on catheter positioning in electrophysiology and summarizes the key technologies for catheter positioning,such as magnetic-electric fusion and interference suppression.Addressing the limitations of electric and magnetic positioning individually,the paper elaborates on the rationale for catheter positioning technology based on magnetic-electric fusion.It also outlines the framework of a complex catheter positioning system.Specifically,the magnetoelectric conversion matrix is established first,followed by the optimization of the catheter shape.The interference factors such as magnetic field interference,body movement,respiration,and heartbeat in catheter positioning and their suppression methods are analyzed and discussed in detail.Finally,the development trend of three-dimensional electrophysiology catheter positioning technology is prospected,offering feasible insights for the research on catheter positioning technology based on magnetic-electric fusion.

Objective:To analyze the genetic sequences of two patients with a rare Ael blood subgroup.Methods:Two female patients undergoing treatment respectively for adenomyoma of the uterus and gastritis at the Second Affiliated Hospital, Yuying Children′s Hospital of Wenzhou Medical University in June 2019 and September 2020 were selected as the study subjects. Their Ael subtypes were identified with a saline tube agglutination assay and absorption-emission assay. Sequence of the ABO gene Ael subtypes was determined by the Sanger method. The impact of genetic variants on the structural stability of N-acetylgalactosaminyl transferase (GTA) was analyzed with PyMOL software by constructing a structure predicted model. Results:Both patients were determined as Ael blood subgroup. Sequencing result of patient 1 was ABO* O.01.02/ ABO* O.01.02, which has resulted in a p. Thr88Profs*31 amino acid substitution. The sequencing result of patient 2 was ABO* Ael.06/ ABO* O.01.02, in which c. 425C>T and c. 467C>T variants in exon 7 have led to p. Met142Thr and p. Pro156Leu substitutions. Prediction of the protein model speculated that the p. Met142Thr not only can change the binding of GTA protein with water molecules, but also the local hydrogen bond network of GTA, which may lead to decreased enzymatic activity. By contrast, the p. Pro156Leu variant has trivial effect on the structural stability of GTA. Conclusion:The molecular structure of Ael subtypes can be diverse. The genotypes of the two patients have been respectively determined as ABO* O.01.02/ ABO* O.01.02 with a G261 deletion and ABO* Ael.06/ ABO* O.01.02.

Objective:To evaluate the prognostic value of sepsis-induced coagulopathy (SIC) in patients with sepsis.Methods:From January 2019 to December 2021, patients with sepsis admitted to the Intensive Care Unit of our hospital were retrospectively classified into the SIC group and non-SIC group according to SIC diagnostic criteria. The baseline clinical data, severity score, total length of hospital stay, length of ICU stay and 28-day survival were compared between the two groups. Kaplan-Meier was used to compare the 28-day survival of patients with sepsis between the two groups. Cox proportional hazard regression model was employed to analyze the risk factors of prognosis in patients with sepsis.Results:Totally 274 patients with sepsis were included in the analysis, including 139 patients in the SIC group and 135 patients in the non-SIC group. The two groups were compared in the perspectives of the Platelet count (PLT), prothrombin time (PT) , procalcitonin (PCT), D dimer, hematocrit, red blood cell distribution width, hemoglobin, acute kidney injury (AKI), the use of continuous renal replacement treatment (CRRT), the use of vasoactive drugs, sequential organ failure assessment (SOFA) score, acute physiology and chronic health evaluation (APACHEⅡ) score were compared between the two groups and the difference were statistically different (all P<0.05). Kaplan-Meier analysis showed that the 28-day mortality rate in the SIC group was significantly higher than that in the non-SIC group (32.4% vs. 14.1%, P<0.05). COX proportional hazard model showed that SIC score ( HR= 2.17, 95% CI: 1.15-3.91, P<0.05), APACHEⅡ score ( HR= 1.13, 95% CI: 1.09-1.17, P<0.05) and the use of vasoactive drugs ( HR=3.66, 95% CI: 1.53-8.75, P<0.05) were independent influencing factors for 28-day death in patients with sepsis. Conclusions:Patients with sepsis and SIC have more severe disease and increased mortality risk. SIC score exhibits good clinical value in predicting the prognosis of patients with sepsis.

Pulmonary hypertension (PH) is an insidious pulmonary vasculopathy with high mortality and morbidity and its underlying pathogenesis is still poorly delineated. The hyperproliferation and apoptosis resistance of pulmonary artery smooth muscle cells (PASMCs) contributes to pulmonary vascular remodeling in pulmonary hypertension, which is closely linked to the downregulation of fork-head box transcriptional factor O1 (FoxO1) and apoptotic protein caspase 3 (Cas-3). Here, PA-targeted co-delivery of a FoxO1 stimulus (paclitaxel, PTX) and Cas-3 was exploited to alleviate monocrotaline-induced pulmonary hypertension. The co-delivery system is prepared by loading the active protein on paclitaxel-crystal nanoparticles, followed by a glucuronic acid coating to target the glucose transporter-1 on the PASMCs. The co-loaded system (170 nm) circulates in the blood over time, accumulates in the lung, effectively targets the PAs, and profoundly regresses the remodeling of pulmonary arteries and improves hemodynamics, leading to a decrease in pulmonary arterial pressure and Fulton's index. Our mechanistic studies suggest that the targeted co-delivery system alleviates experimental pulmonary hypertension primarily via the regression of PASMC proliferation by inhibiting cell cycle progression and promoting apoptosis. Taken together, this targeted co-delivery approach offers a promising avenue to target PAs and cure the intractable vasculopathy in pulmonary hypertension.

BACKGROUND: The presence of fibrosis is a criterion for subtype classification in the newly updated hypersensitivity pneumonitis (HP) guidelines. The present study aimed to summarize differences in clinical characteristics and prognosis of non-fibrotic hypersensitivity pneumonitis (NFHP) and fibrotic hypersensitivity pneumonitis (FHP) and explore factors associated with the presence of fibrosis. METHODS: In this prospective cohort study, patients diagnosed with HP through a multidisciplinary discussion were enrolled. Collected data included demographic and clinical characteristics, laboratory findings, and radiologic and histopathological features. Logistic regression analyses were performed to explore factors related to the presence of fibrosis. RESULTS: A total of 202 patients with HP were enrolled, including 87 (43.1%) NFHP patients and 115 (56.9%) FHP patients. Patients with FHP were older and more frequently presented with dyspnea, crackles, and digital clubbing than patients with NFHP. Serum levels of carcinoembryonic antigen, carbohydrate antigen 125, carbohydrate antigen 153, gastrin-releasing peptide precursor, squamous cell carcinoma antigen, and antigen cytokeratin 21-1, and count of bronchoalveolar lavage (BAL) eosinophils were higher in the FHP group than in the NFHP group. BAL lymphocytosis was present in both groups, but less pronounced in the FHP group. Multivariable regression analyses revealed that older age, <20% of lymphocyte in BAL, and ≥1.75% of eosinophil in BAL were risk factors for the development of FHP. Twelve patients developed adverse outcomes, with a median survival time of 12.5 months, all of whom had FHP. CONCLUSIONS Older age, <20% of lymphocyte in BAL, and ≥1.75% of eosinophil in BAL were risk factors associated with the development of FHP. Prognosis of patients with NFHP was better than that of patients with FHP. These results may provide insights into the mechanisms of fibrosis in HP.
Humans ; Bronchoalveolar Lavage Fluid ; Prospective Studies ; Alveolitis, Extrinsic Allergic/diagnosis* ; Fibrosis ; Carbohydrates

Abstract OBJECTIVE To explore the material basis and mechanism of Crataegi Fructus in improving metabolic hypertension(MH) by using network pharmacology and molecular docking technique.METHODS The components of Crataegi Fructus were collected by HERB, ETCM database and literature survey; screening all ingredients of Crataegi Fructus to improve MH targets through databases such as SwissTargetPrediction and GeneCards; build "active ingredient-target-disease" network of Crataegi Fructus with Cytoscape software; DAVID was used to analyze GO enrichment and KEGG pathway. The core components and core targets were verified by molecular docking with Autodock software. RESULTS The total of 89 active components were screened from Crataegi Fructus and acted on 84 targets. Among them, the core active components of Crataegi Fructus to improve MH were maslinic acid, fomefficinic acid B, linolenic acid, linoleic acid, methyl-n-nonylketone, apigenin, ursolic acid, etc. The core targets were CYP19A1, PPARA, ESR1, PTGS2, PPARG, NR3C1, MMP9, TNF, etc. The mechanism of action mainly involved multiple signaling pathways such as inflammation, glycolipid metabolism, and vascular endothelial function. Molecular docking showed that the core active ingredients of Crataegi Fructus had high affinity with core targets. CONCLUSION Crataegi Fructus may regulate multiple signaling pathways such as TNF, IL-17, AGE-RAGE, HIF-1, cGMP-PKG through multi-component regulation, thereby inhibiting inflammatory response, improving glucose and lipid metabolism abnormalities, and improving vascular endothelial function, so as to comprehensively exert the role of improving MH in various aspects.

Objective:To investigate the effect of early selective reduction of twin pregnancies or spontaneous reduction on the improvement of clinical outcome in IVF-ET treatment.Methods:The clinical data of 6535 cycles(6535 cases)of single or twin pregnancy obtained from fresh and frozen-thawed embryo transfer(FET)of IVF or ICSI-ET in the Department of Reproductive Medicine,Women and Children's Hospital Affiliated to Xiamen Univer-sity from November 2011 to December2021 were analyzed retrospectively,The propensity score matching(PSM)method(1∶4)was used to include the study subjects.The surgical reduction group and the spontaneous single-ton group were included in 128 cycles and 510 cycles,respectively.The spontaneous reduction group and the ini-tial singleton group were included in 511 cycles and 2038 cycles,respectively.The pregnancy outcomes of each groups were compared.Results:After PSM,the number of transferred embryos in the surgical and spontaneous reduction group was higher than that in the initial singleton group.The gestational week of delivery was earlier than that of the initial singleton group,and the birth weight of the newborn was lower than that in the initial single-ton group.The rate of premature delivery and low birth weight was higher than that in the initial singleton group,and the difference was statistically significant(P＜0.05).The incidence of pregnancy complications(postpartum hemorrhage,gestational diabetes,hypertensive disorders of pregnancy)and the rate of cesarean section were not significantly different(P＞0.05).The abortion rate and neonatal birth defect rate were missing after adjusting the PSM model.According to the calculation before adjustment,the early abortion rate of the surgical reduction group and the spontaneous reduction group were significantly lower than that in the initial singleton group(P＜0.05),and the late abortion rate of the spontaneous reduction group was lower than that in the initial singleton group,the difference was statistically significant(P＜0.05).There was no significant difference in the neonatal birth defect rate between the surgical/spontaneous reduction group and the initial singleton group(P＞0.05).Conclusions:Patients with multiple pregnancies caused by assisted reproductive technology(ART)may have a relatively poor prognosis in the perinatal period even if the effect of early pregnancy reduction surgery or spontaneous reduction is limited.Reducing the number of embryos transferred cannot completely reverse the pregnancy outcome.Limiting the number of embryos transferred is the fundamental solution to the adverse outcomes of ART assisted pregnancy.

OBJECTIVE: To identify and analysis three ABO variant Bw subtypes. METHODS: Serological assays were carried out to identify the ABO blood group of the proband. ABO gene was identified by Sanger sequencing. RESULTS: The genotype of three individuals are ABO*Bw.11/0.01.02, ABO*Bw.12/0.01.01, ABO*Bw.34/A1.02, receptively. Sequencing results showed that there were c.695T>C, c.278C>T, c.889G>A, resulting in variants in Leu232Pro, Pro93Leu and Glu297Lys, receptively. CONCLUSION Bw11, Bw12 and Bw34 subgroups were identified, and gene testing can be used as a supplement to determine the ABO blood group subtypes.
ABO Blood-Group System/genetics* ; Alleles ; Blood Grouping and Crossmatching ; Exons ; Genotype ; Humans ; Phenotype ; Sequence Analysis

OBJECTIVE: Sort out and analyze the current status and existing problems of the pilot work of the medical device marketing authorization holder system to provide reference opinions for the full implementation of the medical device marketing authorization holder system. METHODS: Use literature analysis, comparative analysis and field research to comprehensively analyze the status, advantages and risks of commissioned production under the medical device marketing authorization holder system. RESULTS: The commissioned production under the medical device marketing authorization holder system brings dividends and also brings risks. CONCLUSIONS We should consider improving the medical device marketing authorization holder system from marketing authorization holder, the entrusted manufacturer, and the regulatory authority, and strengthen the quality supervision of the entrusted production of products.
China ; Marketing

Early screening is an important means to reduce breast cancer mortality. In order to solve the problem of low breast cancer screening rates caused by limited medical resources in remote and impoverished areas, this paper designs a breast cancer screening system aided with portable ultrasound Clarius. The system automatically segments the tumor area of the B-ultrasound image on the mobile terminal and uses the ultrasound radio frequency data on the cloud server to automatically classify the benign and malignant tumors. Experimental results in this study show that the accuracy of breast tumor segmentation reaches 98%, and the accuracy of benign and malignant classification reaches 82%, and the system is accurate and reliable. The system is easy to set up and operate, which is convenient for patients in remote and poor areas to carry out early breast cancer screening. It is beneficial to objectively diagnose disease, and it is the first time for the domestic breast cancer auxiliary screening system on the mobile terminal.
Breast/pathology* ; Breast Neoplasms/pathology* ; Diagnosis, Computer-Assisted ; Early Detection of Cancer ; Female ; Humans ; Ultrasonography ; Ultrasonography, Mammary/methods*