Because the internal jugular vein (IJV) valve is the only protective valve between the brain and heart, recent studies have focused on the dynamic behaviour of the valve and its importance in regulating the cerebral blood outflow pathway. However, the mechanism underlying valve opening and closure, as well as the normal opening time, has not been investigated before. The aim of the study described here was to investigate IJV physiology in healthy young adults by means of ultrasound imaging. Twenty-four normal young adults (16 male, 8 female, 21.79 ± 0.79 y of age) were enrolled in this study. Each participant underwent IJV B- and M-mode ultrasound scans of the neck veins in supine position. Data on IJV leaflet movement and IJV blood velocity were extracted from images with the associated electrocardiogram traces to analyze the opening and closure cycles of IJV leaflets. The normal opening time calculated in this study includes 70% of the dynamic valve cycle. The normal opening time of the IJV valve could be a new physiologic metric and serves as a premise for further studies in the field of cerebral venous return.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ultrasmedbio.2019.06.418 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
How are brands associated by users in short videos-A study on the mechanism of user associations with brand placements in short videos based on signal theory.
PLoS One
January 2025
School of Business, Xinyang Vocational College of Art, Xinyang, Henan, China.
The emergence of short video platforms has opened new avenues and opportunities for brand marketing. This paper investigates the mechanisms of brand dissemination in short videos, examining strategies for fostering brand associations to fulfill communication objectives. Drawing on signal theory, the study identifies the perceived value of short videos as the source of signals, with brand value and transparency serving as mediating factors, and brand association as the outcome.
View Article and Find Full Text PDFSpin Glass State and Griffiths Phase in van der Waals Ferromagnetic Material FeGeTe.
Nanomaterials (Basel)
December 2024
School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
The discovery of two-dimensional (2D) van der Waals ferromagnetic materials opens up new avenues for making devices with high information storage density, ultra-fast response, high integration, and low power consumption. FeGeTe has attracted much attention because of its ferromagnetic transition temperature near room temperature. However, the investigation of its phase transition is rare until now.
View Article and Find Full Text PDFDisseminated tuberculosis masquerading as a psychiatric illness-A case report.
J Family Med Prim Care
December 2024
Department of Medicine, Universiti Teknologi MARA, Puncak Alam, Malaysia, Asia.
Unlabelled: Tuberculosis (TB) can affect any organ, and at times more than one organ in any sequence, in which case it is referred to as disseminated tuberculosis (DTB). We report a patient who presented primarily for psychiatric symptoms of three months' duration, which later turned out to be a case of DTB involving the central nervous system as well as the spine and lungs.
Case Presentation: An elderly lady with subacute onset and worsening behavioural changes of three months' duration was referred for exclusion of organic brain disease.
Beyond the Hayflick Limit: How Microbes Influence Cellular Aging.
Ageing Res Rev
January 2025
Center for Global Health Research, Saveetha Medical College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India; Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, The Islamic Republic of Iran; Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, The Islamic Republic of Iran. Electronic address:
Cellular senescence, a complex biological process resulting in permanent cell-cycle arrest, is central to aging and age-related diseases. A key concept in understanding cellular senescence is the Hayflick Limit, which refers to the limited capacity of normal human cells to divide, after which they become senescent. Senescent cells (SC) accumulate with age, releasing pro-inflammatory and tissue-remodeling factors collectively known as the senescence-associated secretory phenotype (SASP).
View Article and Find Full Text PDFBpMYB06 Acts as a Positive Regulatory Factor in Saline-alkaline Stress Resistance by Binding to Two Novel Elements.
Plant Cell Physiol
December 2024
The Key Laboratory of Forest Tree Genetics, Breeding and Cultivation of Liaoning Province, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
Saline-alkaline salinity is recognized as one of the most severe abiotic stress factors, limiting plant growth and resulting in significant yield losses. MYB transcription factors (TFs) are crucial for plant tolerance to abiotic stress. However, the roles and regulatory mechanism of MYB TFs underlying saline-alkaline stress tolerance has not yet been investigated in Betula platyphylla.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!