The purpose of this in vitro study was to investigate the influence of aneurysm wall stiffness and of the presence of intraluminal thrombus (ILT) on aneurysm wall movement. Three latex aneurysms were used with different wall stiffness. The aneurysms, equipped with 20 tantalum markers, were attached to an in vitro circulation model. Fluoroscopic roentgenographic stereo photogrammetric analysis was used to measure marker movement during six cardiac cycles at three different systemic pressures. To investigate the influence of ILT on wall movement, we repeated the same experiment with one of the aneurysms. The aneurysm sac was then filled with one of two E-moduli differing thrombus analogues (Novalyse 8 and 20) or with perfusate as a control. It was noted that the amplitude of the wall movement (mm) increased significantly (P < 0.05) as the compliance of the wall increased. The mean amplitude of the wall movement decreased (P < 0.05) as the stiffness (E-modulus) of the ILT increased. In conclusion, ILT has a 'cushioning effect'. Wall movement (and theoretically wall stress) diminishes when the stiffness of the ILT increases. Compliance of the aneurysm wall influences wall movement. When the stiffness of the wall increases, the wall movement diminishes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1258/vasc.2011.oa0324 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Global Comparisons of Age, Gender and Socioeconomic Status Differences of Physical Fitness Health Risk in South African Primary School Children: Longitudinal Data from the NW-CHILD Study.
Int J Environ Res Public Health
November 2024
Faculty of Health Sciences and Sport, University of Stirling, Scotland FK9 4LA, UK.
Global physical fitness (PF) levels have declined over the past 50 years, contributing to early health risks in children although it is still unclear how age, gender and socioeconomic status (SES) impact PF risk. This study aimed to identify unique health risks related to age, SES and gender that might influence muscular fitness (MF) and cardiorespiratory fitness (CRF) levels of primary school children in South Africa. Children ( = 349, boys = 165; girls = 184) of low ( = 201) and high SES ( = 148) underwent three time point measurements at 6, 9 and 12 years spanning seven primary school years.
View Article and Find Full Text PDFRight ventricular function in athletes engaged in endurance exercise using speckle tracking echocardiography: a meta-analysis.
BMC Cardiovasc Disord
January 2025
Department of Ultrasonography, Affiliated Hospital of Hangzhou Normal University, Hangzhou, China.
Background: Long-term endurance training is associated with structural, functional, and biochemical markers of cardiac dysfunction in highly trained athletes. Many studies have focused on structural changes in the right ventricle (RV) and few have examined functional adaptation of the right ventricle. This meta-analysis aims to compare the changes in right ventricular systolic function between endurance athletes and controls before and after exercise using speckle tracking echocardiography (STE).
View Article and Find Full Text PDFEfficacy of Transversus Thoracic Plane Block for Pain Management in Cardiac Surgeries.
Curr Pain Headache Rep
January 2025
Department of Anesthesiology, Louisiana State University Health Sciences Center Shreveport, Shreveport, LA, 71103, USA.
Purpose Of Review: Effective pain management in cardiac surgery presents as a continuous challenge related to the intensity of postoperative pain and reliance on opioid therapy. The dependance of opioid-based therapies is concerning, as these therapies carry risk future addiction and potential severe side effects. The transversus thoracic plane block (TTPB) has emerged as a promising regional anesthesia technique that blocks the anterior branches of the intercostal nerves in the chest wall, potentially providing improved analgesia for cardiac surgery patients.
View Article and Find Full Text PDFBacterial contamination in public transport during COVID-19 pandemic: Characterization of an unusual Staphylococcus aureus isolate tolerant to vancomycin.
Ecotoxicol Environ Saf
January 2025
Department of Medical Microbiology, Second Faculty of Medicine, Charles University and Motol University Hospital, Czech Republic. Electronic address:
Public transport represents a potential site for the transmission of resistant pathogens due to the rapid movement of large numbers of people. This study aimed to investigate the bacterial contamination of frequently touched surfaces in the public transport system operating in the proximity of the biggest Czech hospital during the coronavirus pandemic despite extensive cleaning and disinfection efforts. In June and September 2020, samples from the metro trains, ground transport and stationary objects were collected, enriched and cultured.
View Article and Find Full Text PDFAt First Sight: Fetal Eye Movements Reveal a Preference for Face-Like Configurations From 26 Weeks of Gestation.
Dev Sci
March 2025
Manibus Lab, Department of Psychology, University of Turin, Turin, Italy.
Previous research indicates that both adults and newborns show enhanced electrophysiological and behavioral responses to schematic face-like configurations (FCs-three dots composing a downward-pointing triangle), as compared to the inverted configurations (ICs). Even fetuses, when exposed to light stimuli projected through the uterine wall, preferentially orient their heads toward FCs rather than ICs. However, when this effect emerges along the third trimester of pregnancy and in relation to the maturation of which brain structures is still unknown.
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!