View clinical trials related to Oxygen Deficiency.
Filter by:The aim of the study is to determine the physiological evidence of how muscular and cerebral oxygenation changes link to fatigue, physical, and cognitive performance after moderate-intensity exercise in sedentary older adults with type 2 diabetes.
The presented study is an experimental in-vitro study without intervention in-vivo. The effects of nitric oxide and prostacyclins, 5-hydroxymethylfurfural and alpha-ketoglutarate, volatile anaesthetics on haemoglobin oxygen (HbO2) affinity will be investigated in-vitro. Venous blood samples of 20 healthy young volunteers (10 female, 10 male) will be collected twice in the period of one week. Informed consent will be given. Every blood collection will be accompanied by a venous blood gas analysis. The blood samples will be transferred to the laboratory for in-vitro recording of the complete oxygen dissociation curve (ODC). A newly developed in-vitro method will be used. On the first study day the blood samples will be exposed to three different concentrations of nitric oxide during the measurement, followed by two different vapourized prostacyclins. In addition, different concentrations of 5-hydroxymethylfurfural and alpha-ketoglutarate will be given to the blood samples for ODC recording. On the second study day the dose dependent effects of three different volatile anaesthetics will be investigated by exposing the blood samples to these drug while the measurements. Following these ODC recordings, aliquots of the blood samples will be frozen and investigated for storage related changes in HbO2 affinity.
This clinical study evaluates the effect of 500 mg of 2S-hesperidin for 8 weeks on performance (power generated in different metabolic zones), body composition (fat and muscle mass) and biochemical (antioxidant, inflammatory status) and metabolic (capillary blood in finger) markers in amateur cyclists. Our hypothesis is that chronic intake of 2S-hesperidin can improve performance (maximum power generated). To justify this hypothesis, we measured the parameters mentioned above, which could establish a cause-effect relationship between 2S-hesperidin intake and possible yield improvement.
Testing the absolute accuracy of the Masimo O3 regional oximeter in reading somatic tissue oxygenation in healthy volunteers under controlled hypoxia.
The purpose of this study is to retrospectively review clinical data to determine whether awake proning improves oxygenation in spontaneously breathing patients with COVID-19 severe hypoxemic respiratory failure.
The prone position consists of placing the patient on his or her stomach with the head on the side, during sessions lasting several hours a day and could help spontaneous ventilate the patient.
THRIVE (Transnasal Humidified Rapid-Insufflation Ventilatory Exchange) refers to the use of high-flow nasal cannula to augment the ability to oxygenate and ventilate a patient under general anesthesia. The use of high-flow nasal cannula oxygen supplementation during anesthesia for surgical procedures has been a recent development in the adult population, with limited data analyzing the pediatric population. This study will determine whether high flow nasal cannula oxygen supplementation during surgical or endoscopic procedures can prevent desaturation events in children under anesthesia and improve the outcomes of that surgery.
Brain tumor surgery is commonly associated with different degrees of preoperative intracranial hypertension and surrounding tumor edema, elicited by tumor underlying pathophysiology. During craniotomy for brain tumor resection maintenance of hemodynamic stability and intracranial homoeostasis is of paramount importance. Disordered hemodynamics or adverse stress may activate the immune inflammation or neuroendocrine responses and lead to a surge of inflammatory mediators and stress hormones, which are implicated in secondary brain insults. Adverse physiological responses caused by intraoperative disordered hemodynamics or surgery-related damage, may lead to some secondary brain injury (such as cerebral edema or cerebral hemorrhage), aggravating damage to brain tissue and affecting the recovery from anesthesia, cognition and prognosis in patients. Prevention of secondary brain injury is a key-endpoint to improve clinical outcomes in glioma patients undergoing craniotomy. Alpha2-adrenoceptor agonists have been widely used for sedation, analgesia and anti-sympathetic actions for many years, but the definite evidence of their potential use as neuroprotectants has so far been confined to animal studies, yet the findings are inconsistent. Dexmedetomidine (DEX) has been demonstrated to be a new type a2 adrenergic receptor (a2-AR) agonist, which can selectively bind with the a1 and a2 adrenergic receptor, and playing a dual role by restraining the activity of sympathetic nervous and stimulating the vagus nerve. Dexmedetomidine (DEX) also plays an important role in in inhibiting inflammatory and neuroendocrine responses. Animal experiments showed that the right must have a dexmedetomidine neuro-protective effect. However, the brain-protective effect of dexmedetomidine in anesthesia of craniotomy resection of glioma has not been reported. Thus, the aim of this study was to explore the effect of dexmedetomidine on perioperative brain protection, as well as cerebral oxygenation and metabolic status aiming to provide a basis for clinical rational drug use in patients undergoing craniotomy resection of glioma.
Treatment of O2 naïve patients with PAH will be included in this investigator-initiated trial (IIT) to assess efficacy and safety of oxygen substitution. Nocturnal oxygen substitution improved the 6MWD compared to placebo in one clinical trial in PAH patients. Due to the positive results in the treatment of patients with PAH, the initiation of this proof-of-concept study is justified.
Patients with one or more organ failure (heart, lung) require hospitalization in intensive care where these failures can be managed. Nearly 30% of patients in intensive care units are hospitalized for acute respiratory distress (lung failure). This failure occurs in about 20% of postoperative patient, but it can also occur in the context of a pathology specific to the lung or after weaning of mechanical ventilation. It is therefore interesting to develop several techniques to provide oxygen to these patients with the aim in particular to avoid the use of intubation (insertion of a tube into the trachea to achieve artificial ventilation). For the past ten years, High-Flow Nasal Canula (HFNC) has developed. This technique reduces the need for intubation but the studies are contradictory, however they agree on its ease of use and the few risks associated with it. The principle of this technique is to deliver a humidified and heated gas mixture at a high rate through large nasal cannula. The advantage of this device is its non-invasive and the possibility of administering a large amount of oxygen. There is a certain craze for this oxygenation technique despite few scientific studies in the literature. However, it requires the expertise of the medical and paramedical team so as not to delay intubation. The investigators propose to carry out an observational study (without any modification of the usual practices) with epidemiological aim in order to make an inventory of the modes of use of the HFNC, in particular on its frequency of use and on its duration of use per patient hospitalized in intensive care. The investigators will recruit all HFNC patients in intensive care units (20 centers) (30 patients / center): 15 after weaning of mechanical ventilation and 15 others for other reasons. Patients will be followed every day and up to 48 hours after removal of the HFNC.