Active clinical trials for "Hypoxia"

To determine the lowest nasal cannula flow rate in which upper airway deadspace is reduced. Hypothesis - The lowest flow rate of high flow nasal cannula (HFNC) will reduce upper airway (extrathoracic) deadspace and improve respiratory efficiency by reducing transcutaneous CO2 and/or lower respiratory rate. To determine the lowest nasal cannula flow rate in which regional distribution (as defined by EIT) of ventilation changes. Hypothesis - Moderate to high flow rates will create positive pressure that leads to improved regional distribution of ventilation.

This study is to evaluate the safety and efficacy of Umbilical Cord Derived Mesenchymal Stem Cells transplantation in hypoxic ischemic encephalopathy.

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. 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. 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. 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.

Obesity is omnipresent problem in everyday anesthesiology practice associated with low level of blood oxygen (hypoxemia) during analgo-sedation. Overweight outpatients are often scheduled for colonoscopy usually undergo analgo-sedation. In obese patients, intravenous analgo-sedation often diminish respiratory drive causing hypoxemia. To avoid hypoxemia, low-flow nasal oxygenation (LFNO) of 2-6 L/min is applied via standard nasal catheter to provide maximum 40 % of inspired fraction of oxygen (FiO2). LFNO comprises applying cold and dry oxygen which causes discomfort to nasal mucosa of patient. LFNO is often insufficient to provide satisfying oxygenation. Insufficient oxygenation adds to circulatory instability - heart rate (HR) and blood pressure (BP) disorder. On the other side, high-flow nasal oxygenation (HFNO) brings 20 to 70 L/min of heated and humidified of O2/air mixture up to 100% FiO2 via specially designed nasal cannula. Heated and humidified O2/air mixture is much more agreeable to patient. HFNO brings noninvasive support to patients' spontaneous breathing by producing continuous positive pressure of 3-7 cmH2O in upper airways consequently enhancing oxygenation. Investigators intend to analyze effect of HFNO vs. LFNO on oxygen saturation during procedural analgo-sedation for colonoscopy in obese adult patients. Investigators expect that obese patients with preserved spontaneous breathing, oxygenized by HFNO vs. LFNO, will be less prone to hypoxemia thus more respiratory and circulatory stable during procedural analgo-sedation for colonoscopy. Obese patients with applied HFNO should longer preserve: normal oxygen saturation, normal level of CO2 and O2, reflecting better respiratory stability. Investigators expect obese participnts to have more stable HR and BP, reflecting improved circulatory stability. There will be less interruption of breathing pattern of obese patients and less necessity for attending anesthesiologist to intervene.

Hypoxemia is a common complication after aortic surgery. As this complication has an adverse effect on the postoperative course of the patient, early treatment is important; however, the mechanism of hypoxemia after surgery for acute aortic dissection remains unclear. Recently, the investigators found that inhaled Nitric Oxide can improve the oxygenation in some of these patients. The investigators are trying to evaluate the effectiveness and safety of inhaled Nitric Oxide in patients with refractory hypoxemia after aortic surgery.

Exercise-induced arterial hypoxemia (EIAH), a reduced amount of oxygen in the arterial blood during exercise, has been observed in otherwise healthy, highly-trained endurance athletes during exercise at sea level. The extent of the arterial deoxygenation may be influenced by a histamine-mediated inflammatory response at the pulmonary capillary-alveolar membrane limiting oxygen diffusion. Moreover, while EIAH has been routinely explored in running and cycling, swimming is understudied despite potential mechanistic avenues which may put swimmers at further risk for EIAH. The purpose of this study is threefold: 1) to determine whether highly-trained swimmers experience EIAH during submaximal and maximal exercise, 2) to determine the extent to which histamine release influences oxyhemoglobin saturation during swimming exercise, and 3) to determine whether nedocromil sodium (NS), a mast cell stabilizer, and cetirizine HCl (CH), an H1-receptor competitive inhibitor, can improve oxyhemoglobin saturation during submaximal and maximal swimming exercise. Twenty-six (13 men, 13 women) highly-trained swimmers will complete an intense swimming protocol to assess the histamine response to intense exercise. A subset with the highest histamine responses will participate in three additional sessions (placebo, NS, and CH conditions) which will include a swimming aerobic capacity test and 5-minutes of swimming at both 70 and 85% of their maximal oxygen uptake.

In this randomized controlled trial (RCT), severe cases of COVID-19 infection will be treated with secretome of hypoxia-mesenchymal stem cells. The improvement in clinical, laboratory, and radiological manifestations will be evaluated in treated patients compared with the control group.

RATIONALE: Diagnostic procedures, such as MRI, may help measure oxygen levels in tumor cells. It may also help doctors predict a patient's response to treatment and help plan the best treatment. PURPOSE: This clinical trial is studying how well MRI works in assessing hypoxia in patients with localized prostate cancer undergoing stereotactic body radiation therapy.

This laboratory study is using EF5 to evaluate tumor hypoxia in patients with high-grade soft tissue sarcoma or mouth cancer. Using the drug EF5 to measure the oxygen level in tumor cells may help in planning cancer treatment

The purpose of this study is to determine the effectiveness of continuous positive airway pressure compared to standard treatment in preventing the need for intubation and mechanical ventilation in patients who develop acute hypoxemia after liver transplant. Hypoxemia complicates the recovery of 30-50 % of patients after abdominal surgery; endotracheal intubation and mechanical ventilation may be required in 8-10 % of cases increasing morbidity and mortality and prolonging intensive care unit and hospital stay.