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Middle ear biofilm and sudden deafness - a light and transmission electron microscopy study.
Front Neurol
December 2024
Department of Surgical Sciences, Otorhinolaryngology and Head and Neck Surgery, Uppsala University, Uppsala, Sweden.
Background: There still exists controversy about whether the healthy human middle ear mucosa is sterile or if it may harbor a diverse microbiome. Considering the delicacy of the human round window membrane (RWM), different mechanisms may exist for avoiding inner ear pathogen invasion causing sensorineural deafness. We re-analyzed archival human RWMs using light and transmission electron microscopy after decalcification to determine if bacteria are present in clinically normal human middle ears.
View Article and Find Full Text PDFPerspective: Timely diagnosis and repair of intraoperative thoracic/lumbar cerebrospinal fluid (CSF) leaks.
Surg Neurol Int
July 2024
Assistant Clinical Professor of Orthopedics, NYU Langone Hospital, Long Island, NY, USA, 1122 Franklin Avenue Suite 106, Garden City, NY, USA.
Article Synopsis
- * Effective methods to reduce these complications include thorough operative decompressions, use of operating microscopes, and avoiding aggressive techniques when significant dural adhesions are present.
- * Recommended repair techniques involve using non-resorbable sutures, muscle patch grafts, and additional methods like fibrin sealants and lumbar drains to mitigate CSF leaks.
Plugging performance and mechanism of an OBDF oil-absorbing resin (MMA-SMA-St) plugging agent.
RSC Adv
June 2024
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University Chengdu 610500 China
To treat the issue of increased resource wastage due to the higher plugging tendencies of oil-based drilling fluids (OBDF) relative to water-based drilling fluids, this study synthesized a ternary composite oil-absorbing resin and optimized its synthesis parameters. The influence of temperature variations on the resin's oil absorption capacity was assessed. Techniques such as infrared spectroscopy, scanning electron microscopy, TGA-DSC measurements, crosslinking degree analysis, contact angle analysis, X-ray photoelectron spectrometry analysis and examination of the resin's plugging mechanism were employed to investigate its molecular structure, oil absorption properties, and plugging efficiency.
View Article and Find Full Text PDFEmbolization of Vessels With Irregular Lumen Using the Coil Packing Technique Between the Amplatzer Vascular Plug II Lobes.
Cureus
May 2024
Department of Cardiothoracic Surgery, Showa General Hospital, Tokyo, JPN.
Introduction: The Amplatzer Vascular Plug (AVP) series enables precise positioning and high migration resistance, allowing embolization in short segments; however, inadequate embolization or recanalization may occasionally occur. We hypothesized that leaks may occur when AVPs are implanted in vessels with irregular lumen due to insufficient adherence to the vessel. This hypothesis was tested by experiments with a vascular model.
View Article and Find Full Text PDFAn Innovative High-Strength Double-Network Hydrogel for Use as a Drilling Fluid Plugging Agent.
Gels
March 2024
School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou 213164, China.
The problem of wellbore leakage is a key challenge in the petroleum industry, limiting drilling progress and increasing drilling costs. Plugging agents play a role in repairing leaks and fractures; however, traditional plugging materials generally have low mechanical strength, poor adaptability to permeable strata, limited water absorption and expansion capabilities, and poor temperature and salt resistance. To address these limitations, a pioneering polyacrylic acid-polyacrylamide (PAA/PAM) double-network hydrogel was synthesized through aqueous solution polymerization in this study.
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