Background: Brain tissue hypoxia is a common consequence of traumatic brain injury (TBI) due to the rupture of blood vessels during impact and it correlates with poor outcome. The current magnetic resonance imaging (MRI) techniques are unable to provide a direct map of tissue hypoxia.
Purpose: To investigate whether GdDO3NI, a nitroimidazole-based T MRI contrast agent allows imaging hypoxia in the injured brain after experimental TBI.
Study Type: Prospective.
Animal Model: TBI-induced mice (controlled cortical impact model) were intravenously injected with either conventional T agent (gadoteridol) or GdDO3NI at 0.3 mmol/kg dose (n = 5 for each cohort) along with pimonidazole (60 mg/kg) at 1 hour postinjury and imaged for 3 hours following which they were euthanized.
Field Strength/sequence: 7 T/T -weighted spin echo and T -weighted gradient echo.
Assessment: Injured animals were imaged with T -weighted spin-echo sequence to estimate the extent of the injury. The mice were then imaged precontrast and postcontrast using a T -weighted gradient-echo sequence for 3 hours postcontrast. Regions of interests were drawn on the brain injury region, the contralateral brain as well as on the cheek muscle region for comparison of contrast kinetics. Brains were harvested immediately post-imaging for immunohistochemical analysis.
Statistical Tests: One-way analysis of variance and two-sample t-tests were performed with a P < 0.05 was considered statistically significant.
Results: GdDO3NI retention in the injury region at 2.5-3 hours post-injection was significantly higher compared to gadoteridol (mean retention fraction 63.95% ± 27.43% vs. 20.68% ± 7.43% for gadoteridol at 3 hours) while it rapidly cleared out of the muscle region. Pimonidazole staining confirmed the presence of hypoxia in both gadoteridol and GdDO3NI cohorts, and the later cohort showed good agreement with MRI contrast enhancement.
Data Conclusion: GdDO3NI was successfully shown to visualize hypoxia in the brain post-TBI using T -weighted MRI at 2.5-3 hours postcontrast.
Evidence Level: 1 TECHNICAL EFFICACY: Stage 1.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/jmri.27912 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Obesity-associated memory impairment and neuroinflammation precede widespread peripheral perturbations in aged rats.
Immun Ageing
January 2025
Institute for Behavioral Medicine Research, Ohio State University, 460 Medical Center Drive, Columbus, OH, 43210, USA.
Background: Obesity and metabolic syndrome are major public health concerns linked to cognitive decline with aging. Prior work from our lab has demonstrated that short-term high fat diet (HFD) rapidly impairs memory function via a neuroinflammatory mechanism. However, the degree to which these rapid inflammatory changes are unique to the brain is unknown.
View Article and Find Full Text PDFImmunohistochemical labeling of ongoing axonal degeneration 10 days following cervical contusion spinal cord injury in the rat.
Spinal Cord
January 2025
McKnight Brain Institute, University of Florida, Gainesville, FL, USA.
Study Design: Experimental Animal Study.
Objective: To continue validating an antibody which targets an epitope of neurofilament light chain (NF-L) only available during neurodegeneration and to utilize the antibody to describe the pattern of axonal degeneration 10 days post-unilateral C4 contusion in the rat.
Setting: University of Florida laboratory in Gainesville, USA.
Building a growing genomic repository for maternal and fetal health through the PING Consortium.
Pediatr Res
January 2025
Center for Genetic Medicine, Children's National Research Institute, Washington, DC, USA.
Background: Prenatally transmitted viruses can cause severe damage to the developing brain. There is unexplained variability in prenatal brain injury and postnatal neurodevelopmental outcomes, suggesting disease modifiers. Of note, prenatal Zika infection can cause a spectrum of neurodevelopmental disorders, including congenital Zika syndrome.
View Article and Find Full Text PDFSubdural hematoma as a complication of endoscopic third ventriculostomy in a pediatric patient: a case report and literature review.
Childs Nerv Syst
January 2025
Department of Neurosurgery, Hospital de São José, ULS São José, Lisbon, Portugal.
Background: Subdural hematoma (SDH) typically occurs due to traumatic brain injury but can arise as a rare complication of procedures like endoscopic third ventriculostomy (ETV).
Case Presentation: We report an unusual case in a 9-year-old male with previous resection of a fourth-ventricle ependymoma at 2 years of age. Seven years post-surgery, he presented with worsening hydrocephalus and underwent ETV.
Background: Paroxysmal sympathetic hyperactivity (PSH) occurs with high prevalence among critically ill patients with traumatic brain injury (TBI) and is associated with worse outcomes. The PSH-Assessment Measure (PSH-AM) consists of a Clinical Features Scale and a diagnosis likelihood tool (DLT) intended to quantify the severity of sympathetically mediated symptoms and the likelihood that they are due to PSH, respectively, on a daily basis. Here, we aim to identify and explore the value of dynamic trends in the evolution of sympathetic hyperactivity following acute TBI using elements of the PSH-AM.
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!