Active clinical trials for "Hypoxia"

The purpose of this study is to look at how a reduction in oxygen levels (hypoxia) influences insulin sensitivity and carbohydrate metabolism. It is expected that 10 nights of exposure to moderate hypoxia (~ 15% O2, similar to conditions at an altitude of ~7500 feet) will improve glucose metabolism.

The investigators hypothesize that the addition of capnography during moderate sedation will improve recognition of hypoventilation and apnea. This will lead to an increased frequency of staff interventions such as verbal or physical stimulation for these events in order to improve ventilation which will in turn lead to a reduction in the frequency of oxygen desaturations. If capnography proves to be effective in creating earlier detection and intervention for hypoventilation and apnea during moderate sedation provided by non-anesthesiologists, this device can be used in a variety of clinical settings to enhance patient safety.

Background : In malignant gliomas, hypoxia is associated with tumour angiogenesis and tumour progression. This multidisciplinary preclinical and clinical project aims to validate the use of 18F-FMISO as a hypoxic marker for diagnosis, treatment and follow-up of malignant gliomas. Indeed, non-invasive methods of imagery such as Positron Emission Tomography (PET) and biological methods (after surgical resection) to detect the endogenous expression of factors induced by the hypoxia would allow to identify hypoxic areas. Identifying, with accuracy, the hypoxic areas could allow the clinicians to evaluate the response to the anti-angiogenic agents (preliminary validation in the preclinical project) and to optimize the combination of the anti-VEGF treatments with other conventional therapeutic approaches (radiotherapy, chemotherapy or other molecules). Research project : This research project includes 3 steps : first the investigators will establish the 18F-FMISO production technique for clinical application at CYCERON PET center. The second step consists in the preclinical validation of 18F-FMISO as a hypoxic marker and as a powerful tool for evaluating the therapeutical efficiency of anti-angiogenic treatment (sutent) in experimental rat gliomas. The third step is the clinical trial HypOnco. This research proposal aims to develop and use non invasive imaging methods (18F-FMISO with PET) and biological methods (after surgical resection) to detect hypoxic (HIF1 and HIF2) and angiogenic (VEGF and EPO) regions in different malignant gliomas with different degrees of vascularization (15 patients with grade III gliomas and 15 patients with grade IV glioblastomas). Within the same patient 18F-FMISO as a hypoxic index will be performed. A magnetic resonance imaging examination (MRI) including perfusion sequences and MR spectroscopy will also be assessed for each patient. Following this imaging protocol, surgical resection will be performed allowing us to study expression of endogenous factors induced by hypoxia and angiogenic factors by real time RT-PCR and in immunohistochemistry. The data obtained will enable us to establish : a hypoxic index (18F-FMISO with PET). an index of hypoxic factor expression (HIFs) an angiogenic index (VEGF, EPO, vascular markers) The investigators will characterize the links between these data and also with the following parameters: clinical (age, Karnofsky performance status, survival) MR parameters included perfusion and spectroscopy histological (necrosis, cellular proliferation, atypical cell abnormalities, vascularization). Expected results and clinical advantages To establish the 18F-FMISO production technique To propose the 18F-FMISO as a non-invasive marker for efficacy of antiangiogenic treatment in a preclinical study. To define the relationship between the 18F-FMISO uptake and tumour grade, patient survival, tumour recurrence, expression of hypoxic and angiogenic factors and tumour vascularisation. To provide a hypoxic index in cerebral tumours from 18F-FMISO PET, allowing diagnosis and prognosis improvement for optimal treatment orientation and strategy. In the field of the clinical applications, this tool will allow to : Optimize radiotherapy treatment by identifying with accuracy, using 18F-FMISO PET, the most hypoxic areas which are also the most radio resistant. Evaluate antiangiogenic therapy efficacy

Perinatal asphyxia-induced brain injury is one of the most common causes of morbidity and mortality in term and preterm neonates. Birth asphyxia accounts for 23% of neonatal deaths globally and survivors suffer from long term neurological disability and impairment. Although many neuroprotective strategies appeared promising in animal models, most of them were not feasible and effective in human newborns. However, hypothermia was reported not to be effective if introduced beyond and thus should be introduced within 6 hrs after birth.Applying this selection criterion naturally would deprive many patients of the opportunity of hypothermia treatment.

The purpose of this study is to determine whether nerve growth factor (cerebrolysin®) therapy will improve the psychomotor outcome in infants with moderate and severe hypoxic ischemic encephalopathy after hospital discharge.

This Phase 3, Double-blind, Randomized, Placebo controlled, multicenter study is to confirm the efficacy of inhaled nitric oxide for the management of hypoxic respiratory failure associated with pulmonary hypertension in preterm infants. Study subjects will be administered either inhaled nitric oxide or placebo to determine if there is a change in oxygenation.

Hypoxia (low oxygen level) is know to be present in many tumors and may strongly influence the success of treatment and the progression of disease in prostate cancer. The method used to measure tumor oxygen levels in prostate cancer is to place a needle in the prostate itself through the rectum. Blood oxygen level dependent imaging (BOLD MRI) is a special MRI technique that allows indirect assessment of oxygen levels in blood. This technique is non-invasive, involving no needles. BOLD has not been applied in humans in prostate cancer. The purpose of this study is to develop a MRI-BOLD technique that allows us to non-invasively measure changes related to tumor hypoxia in prostate cancer. This technique may provide information that will be an independent predictor of patient survival, tumor recurrence and likelihood of treatment response in prostate cancer

To investigate the role of HIF 1α and LC3B in the pathogenesis of MAP, to evaluate the role of MMP-9 in the antenatal prediction of MAP, and to compare the expression of HIF1α, LC3B, and level MMP-9 between patients of placenta previa with MAP and patients with normal placentation.

The aim of this study is to evaluate the impact of the FreeO2 system on the quality of the oxygen therapy in confirmed or suspected SARS-CoV-2 patients in the emergency department.

To determine if exposure of older volunteers, age 50-70y, who are healthy, but not physically active, to 7 days of mild hypoxia (15% oxygen, equivalent 2440m) will improve cardiopulmonary functional capacity.