View clinical trials related to Hypoxia.
Filter by:In mammals, uterine environment is at low oxygen concentration (2-8% O2). Thus, human embryo culture under low O2 tension (5%) is now recommended by European Society of Human Reproduction and Embryology (ESHRE) revised guidelines for good practices in in vitro fertilization (IVF) labs. Indeed, hypoxia seems to improve embryo quality at cleavage and blastocyst stages, presumably by reducing damages of oxidative stress (OS). Nevertheless, recent meta-analyses concluded only with a low evidence to a superiority of hypoxia on IVF/ICSI outcomes. Furthermore, a study on mouse embryos suggested a negative impact of OS only at cleavage stage. The aim of the present prospective randomized study was to investigate this hypothesis for the first time in human embryos.
The current study will investigate methods for enhancing cognitive training (CT) effects in healthy older adults by employing a combination of interventions facilitating neural plasticity and optimizing readiness for learning. Adults over the age of 65 represent the fastest growing group in the US population. As such, age-related cognitive decline represents a major concern for public health. Recent research suggests that cognitive training in older adults can improve cognitive performance, with effects lasting up to 10 years. However, these effects are typically limited to the tasks trained, with little transfer to other cognitive abilities or everyday skills. A pilot randomized clinical trial will examine the individual and combined impact of pairing cognitive training with an intermittent hypoxia (IH) intervention. The investigators will compare changes in cognitive and brain function resulting from CT combined with active IH versus CT combined with sham IH using a comprehensive neurocognitive, clinical, and multimodal neuroimaging assessment of brain structure, function, and metabolic state. Functional magnetic resonance imaging (FMRI) will be used to assess brain response during speed of processing; the active cognitive abilities trained by CT. Magnetic resonance spectroscopy (MRS) will assess cerebral metabolites, including ATP and GABA concentrations sensitive to neural plasticity.
Nitrate supplements (beetroot juice, pure sodium nitrate) have become common among endurance athletes because the ingestion of exogenous nitrate leads to increased levels of nitric oxide (NO) in the body. Increased NO has been shown to have various performance enhancing effects such as increased muscle contractility, increased blood flow through vasodilation, mitochondrial biogenesis, and improved glucose uptake. Supplementation with exogenous forms of nitrate has also been shown to improve cycling performance in the oxygen deprived environment of simulated altitude through increased muscular oxygenation. Further research is emerging that suggests that dark chocolate (DC) may have similar effects through flavonoids, a bioactive micronutrient that increases the synthesis of NO and reduces the rate at which NO is removed from the blood. In addition to performance enhancement, the flavonoids in DC also have anti-inflammatory and antioxidant effects, which could reduce muscle damage after a bout of exercise and increase the rate at which the muscle recovers. The purpose of this research is to investigate the effects of DC on cycling performance and recovery in cyclists at altitude. it is hypothesised that the DC condition will result in superior metabolism during exercise and increase muscular oxygenation, leading to improved performance while enhancing recovery from exercise. Methods: 12 trained cyclists will be randomized to supplement with 160g of DC or an isocaloric placebo per day for 2 weeks in a cross-over study. After the 2-weeks of supplementation participants will attend a lab session in which they will cycle 90 minutes at 60% VO2max followed immediately by a 10km time trial (TT) at a simulated altitude of 1500m (15% O2). Plasma levels of blood glucose and lactate will be measured before, throughout, and after exercise while muscular and cerebral oxygenation will be measured continuously throughout exercise. Recovery of the knee extensors will be assessed before and immediately after exercise as well as 24 and 48 hours later by determining knee extensor strength and muscle pain.
A significant number of elderly patients experience a complication after cardiac surgery. This study aims to determine if postoperative remote monitoring of vital signs can be used to identify medicatie risk factors for vital sign deterioration in older cardiac surgery patients. - Single center pilot study. - 100 older patients undergoing cardiac surgery. - Continuous remote monitoring of vital signs after ICU discharge - Main study endpoint is vital sign deterioration.
Background: Acute kidney injury (AKI) is a common and serious postoperative complication in children with congenital heart disease. In this prospective cohort study, we tested the hypothesis that renal desaturation defined as a 20% decline of renal tissue oxygen saturation (SrtO2) from the baseline value is associated with AKI in infants undergoing ventricular septal defect (VSD) repair with cardiopulmonary bypass (CPB). Methods: Infants aged 1 months to 12 months and scheduled to undergo VSD repair with CPB were eligible. SrtO2 was monitored using a tissue near-infrared spectroscopy. Renal desaturation was defined as a decrease of SrtO2 measurement from the baseline value for more than 20% lasting for more than 60 s. The primary outcome was the incidence of AKI on postoperative 1-3 days according to the Kidney Disease: Improving Global Outcomes criteria. The secondary outcomes included different stages of AKI, duration of postoperative mechanical ventilation, duration of intensive care unit (ICU) and hospital stay, renal replacement therapy (RRT), and in-hospital mortality.
The purpose of this clinical study is to validate the SpO2 accuracy of the BiOSENCY BORA BAND™ wristband Pulse Oximeter during non-motion conditions over the range of 70-100% SaO2 as compared to arterial blood samples assessed by CO-Oximetry. The end goal is to provide supporting documentation for the SpO2 accuracy validation of BORA BAND™ wristband Pulse Oximeter. It is required that the Accuracy Root Mean Square (ARMS) performance of the BORA BAND™ wristband Pulse Oximeter will meet a specification of 3.5 or better in non-motion conditions for the range of 70 - 100% SpO2 thereby demonstrating an acceptable SpO2 accuracy performance specification.
The aim of this study is to evaluate the clinical feasibility of the angiographic Flat Detector CT perfusion imaging (6s PBV) technique. The investigators will examine the specific vessel distribution of patients with steno-occlusive disease, treated with a surgical extracranial-intracranial bypass and assess the cerebral perfusion during test occlusion upon a neurovascular treatment and in intracranial tumor patients referred for potential pre-operative embolization. This study encompasses three scientific objectives: 1. What is the selective contribution of an individual bypass artery to the brain perfusion? 2. Is a selective intra-arterial angiographic perfusion examination useful in the decision-making of performing pre-operative embolization of intracranial tumors? 3. What is the usefulness of performing additive 6s PBV images compared to classical 2D angiography and/or clinical neurological evaluation in case of test occlusion in the evaluation of possible mother vessel occlusion in treatment of complex neurovascular diseases?
A single institutional cross-over study design to compare between high flow humidified oxygen (HFHO) device versus conventional CPAP for non-ventilated lung during thoracic surgery.
The non-invasive measurement of dysfunctional hemoglobins allows physicians to monitor levels in affected individuals without requiring blood samples or laboratory testing. Nonin Medical Inc, has recently developed a multi-wavelength device that measures carboxyhemoglobin and methemoglobin non-invasively. The primary objective of this study is to validate %MetHb and SpO2 accuracy performance of the study device. Evaluations will be for the range of 0 to 15% MetHb with 95-100% SaO2 as assessed by CO-oximetry, and 0-15% MetHb accuracy under conditions of elevated HHb (SaO2 80-100%) as assessed by CO-oximetry, and SpO2 with 80-100% SaO2 during elevated MetHb as assessed by CO-oximetry.
Multiple Sclerosis (ME) is a degenerative, inflammatory and autoimmune demyelinating disease of the central nervous system, characterized by demyelination due to inflammation and degeneration of the myelin sheaths enveloping nerves of the eye, periventricular grey matter, brain, spinal cord and brainstem. The symptoms associated with MS include symptomatic fatigue, muscle weakness, ataxia, mobility and balance problems or cognitive problems. Moderate intensity strength training has been shown to improve strength and mobility in persons with MS. It was suggested that whole-body vibration training (WBVT) is effective to improve muscle strength, such as resistance training, resulting from both neural and structural adaptations. On the other hand, traditional strength training in hypoxia has garnered much attention. This method has shown improvements in isometric strength and increases in muscle size.