Publications by authors named "N M Petri"
Purpose: To investigate image quality and agreement of derived cardiac function parameters in a novel joint image reconstruction and segmentation approach based on disentangled representation learning, enabling real-time cardiac cine imaging during free-breathing.
Methods: A multi-tasking neural network architecture, incorporating disentangled representation learning, was trained using simulated examinations based on data from a public repository along with MR scans specifically acquired for model development. An exploratory feasibility study evaluated the method on undersampled real-time acquisitions using an in-house developed spiral bSSFP pulse sequence in eight healthy participants and five patients with intermittent atrial fibrillation.
Article Synopsis
- A study conducted from November 2020 to June 2023 assessed the performance of SARS-CoV-2 rapid antigen tests (RDTs) compared to standard RT-qPCR testing among a large group of patients and staff in a hospital setting.
- The analysis of nearly 78,800 paired results revealed that RDTs had a sensitivity of 34.5% and a specificity of 99.6%, with sensitivity decreasing as fewer symptomatic infections occurred over the course of the pandemic.
- The findings suggest that RDTs are still effective for diagnosing COVID-19 in symptomatic patients and could be useful for identifying other respiratory infections in the future, despite their declining sensitivity linked to vaccination and the spread of the Omicron variant
Article Synopsis
- Device-related thrombosis (DRT) occurs frequently after left atrial appendage closure (LAAC), with notable differences in diagnosis timing and outcomes between men and women.
- Women make up 34.7% of DRT patients in the study and tend to be older and have fewer comorbidities compared to men, but DRT in women is diagnosed significantly later.
- Both genders have similar treatment outcomes and overall mortality rates, indicating that treatment strategies are equally effective regardless of sex.
Heterologous and homologous COVID-19 mRNA vaccination schemes for induction of basic immunity show similar immunogenicity regarding long-term spike-specific cellular immunity in healthcare workers.
Vaccine
August 2024
Healthcare workers (HCWs) are recommended to receive at least three spike-antigen exposures to generate basic immunity and to mediate herd protection of vulnerable patients. So far, less attention has been put on the cellular immune response induced by homologous (three BTN162b2mRNA doses) or heterologous (mRNA-1273 as third dose building on two BTN162bmRNA doses) and the immunological impact of breakthrough infections (BTIs). Therefore, in 356 vaccinated HCWs with or without BTIs the Anti-SARS-CoV-2-Spike-IgG concentrations and avidities and B- and T-cell-reactivity against SARS-CoV-2-Spike-S1- and Nucleocapsid-antigens were assessed with Interferon-gamma-ELISpot and by flow-cytometry.
View Article and Find Full Text PDFBackground: Vertebrate left-right symmetry breaking is preceded by formation of left-right organizer. In Amphibian, this structure is formed by gastrocoel roof plate, which emerges from superficial suprablastoporal cells. GRP is subdivided into medial area, which generates leftward flow by rotating monocilia and lateral Nodal1 expressing areas, which are involved in sensing of the flow.
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