View clinical trials related to Brain Ischemia.
Filter by:The goal of this study is to develop a large longitudinal cohort of individuals diagnosed with or at high risk for brain diseases (both neurological and psychiatric in nature), in order to identify risk factors that contribute to neurological and psychiatric diseases over time. The investigators seek to capture relevant information from medical records, electronically administered questionnaires and follow up phone-based interviews. The investigators expect to eventually have sufficient power from our dataset to examine risk factors for a variety of brain disorders, both individually and in aggregate. Our ultimate goal is to offer scientifically validated ways to preserve and promote brain health by working with our patients' needs and tracking their progress over time.
We and other investigations suggested that the activation of nerve cell cycle following cerebral ischemia led to neuronal apoptosis, glial cell proliferation and the formation of glial scar.The cyclin-dependent kinases (CDKs) and cyclins jointly promoted the cell cycle progression. Our preliminary clinical trial found a new microRNA-miR-494, which involved in the occurrence of acute ischemic stroke. In our animal experiment, miR-494 could relieve cerebral ischemia injury through inhibiting cyclin-dependent kinase 6(CDK6), ubiquitin-conjugating enzyme E2L6 (UBE2L6) and histone deacetylase 3 (HDAC3), which suggested that miR-494 might play an important role in the regulation of cell cycle following cerebral ischemia. This project intends to verify the following hypothesis：①miR-494 suppresses CDK6, and/or fibroblast growth factor16(FGF16)-Ras-extracellular signal-regulated kinase(ERK)--v-myc avian myelocytomatosis viral oncogene homolog(MYC) pathway, and/or phosphatase and tensin homolog(PTEN)-/protein kinase B(AKT)-mechanistic target of rapamycin(mTOR)-S6k pathway;②miR-494 inhibits UBE2L6, upregulates the hypoxia-inducible factor 1 α(HIF-1α) expression in nerve cells, thereby increases the p21 and p27 protein levels and inhibits cyclin-dependent kinase2(CDK2)activity;③miR-494 represses HDAC3 and downregulates the cyclin-dependent kinase1(CDK1)protein level. These all mediate the cell cycle arrest of neurons and astrocytes, reduce the neuronal apoptosis and glial scar formation,promote the recovery of neurological function and provide new targets for the treatment of ischemic stroke.
Neonates presenting with neurologic symptoms require rapid, non-invasive imaging with high spatial resolution and tissue contrast. The purpose of this study is to evaluate brain perfusion using contrast-enhanced ultrasound CEUS in bedside monitoring of neonates and infants with hypoxic ischemic injury. Investigational CEUS scan will be performed separately from clinically indicated conventional US, in the ICU. Subjects will be scanned with CEUS at two different time-points (at the time HII is first suspected or diagnosed and at time of MRI scan), separately from clinically indicated ultrasound. The CEUS scan will be interpreted by the sponsor-investigator. The study will be conducted at one site, The Children's Hospital of Philadelphia. It is expected that up to 100 subjects will be enrolled per year, for up to two years, for a total enrollment of up to 200 subjects.
Demonstrate that maintenance of systolic blood pressure between 140 and 160 mm Hg during the acute phase of ischemic stroke is more effective than management according to the International Guideline (treat when systolic blood pressure exceeds 185 mm Hg)
The FLAG1 study will assess the diagnostic performance of biomarkers Glutathion S-Transferase-π (GST-π) and Peroxyredoxin 1 (PRDX1) to identify cerebral infarction of less than 4,5 hours in a population of patients with neurological deficiency of less than 12 hours.
The study is to investigate the feasibility and safety of autologous umbilical cord blood transfusion to treat the newborn infants with presence of clinical indications of neonatal hypoxic-ischemia encephalopathy (HIE) and anemia. Umbilical cord blood (UCB) is collected following labor and is transfused intravenously within 48 hours after the birth. Newborn infant without UCB available recieves the standard care will be enrolled as control group. Following the autologous UCB transfusion in the study group or standard care in the control group, HIE subjects will be followed for 2 years for survival and neurodevelopmental outcomes and anemia subjects will be followed for 6 months to assess the survival and change of hematocrit and hemoglobin levels.
The Stroke Recovery Initiative is a nation-wide participant recruitment registry that connects people who have had a stroke with researchers who are working to develop new approaches to improve recovery after stroke.
Citicoline, is a naturally occurring compound and an intermediate in the metabolism of phosphatidylcholine. Phosphatidylcholine is an important component of the phospholipids of the cell membranes. Citicoline is composed of two molecules: cyti¬dine and choline. Both these molecules enter the brain separately and by passing through the blood-brain barrier where they act as substrates for intracellular synthesis of CDP-choline . This drug has been widely used in adults who suffer from acute ischemic strokes for than 4 decades with good results and has been proved to have a very good safety profile as well. It has various therapeutic effects at several stages of the ischemic cascade in acute ischemic stroke. 1. It stabilizes cell membranes by increasing phosphatidylcholine and sphingomyelin synthesis and by inhibiting the release of free fatty acids . By protecting membranes, citicoline inhibits glutamate release during ischemia. In an experimental model of ischemia in the rat, citicoline treatment decreased glutamate levels and stroke size. 2. Citicoline favors the synthesis of nucleic acids, proteins, acetylcholine and other neurotransmitters, and decreases free radical formation Therefore, citicoline simultaneously inhibits different steps of the ischemic cascade protecting the injured tissue against early and delayed mechanisms responsible for ischemic brain injury. 3. citicoline may facilitate recovery by enhancing synaptic outgrowth and increased neuroplasticity with decrease of neurologic deficits and improvement of behavioral performance. Considering these pharmacologic properties of citicoline, we are planning to see its effects in newborns who have HIE which causes a global acute ischemic changes in developing brain.
This observational study aims to research whether there is a relationship between omentin and ischemic stroke on the aspects of incidence, severity, and recovery etc.
The purpose of this study is to investigate the efficacy and safety of umbilical cord milking in depressed neonates at birth for prevention of hypoxic ischemic encephalopathy.