Active clinical trials for "Hypoxia"

Exercise training improves endothelium-dependent vasodilation, whereas hypoxic stress causes vascular endothelial dysfunction. Monocyte- derived endothelial progenitor cells (Mon-EPCs) contribute to vascular repair process by differentiating into endothelial cells. This study investigates how high-intensity interval (HIT) and moderate intensity-continuous (MCT) exercise training affect circulating Mon-EPC levels and EPC functionality under hypoxic condition. Sixty healthy sedentary males were randomized to engage either HIT (3-minute intervals at 40% and 80%VO2max , n=20) or MCT (sustained 60%VO2max , n=20) for 30 minutes/day, 5 days/week for 6 weeks, or to a control group that did not received exercise intervention (n=20). Mon-EPC characteristics and EPC functionality under hypoxic exercise (HE, 100W under 12%O 2 ) were determined before and after various interventions.

A highly pathogenic human coronavirus causing respiratory disease emerged in Saudi Arabia in 2012. This viral infection termed Middle East respiratory syndrome coronavirus (MERS-CoV) is associated with high mortality rate in approximately 36% of reported patients. The World Health Organization (WHO) reported 1,374 laboratory-confirmed worldwide infections, including at least 490 related deaths, from September, 2012, to July 24, 2015.2 The higher incidence of MERS-CoV infections in Saudi Arabia may be related to multiple factors, including seasonality, increased proactive screening, poor infection control measures, low relative humidity, and high temperature. Infected patients with MERS-CoV usually have abnormal findings on chest radiography, ranging from subtle to extensive unilateral and bilateral abnormalities. MERS progresses rapidly to respiratory failure, in approximately 2/3 of infected patients, which has a high mortality rate, particularly in immunocompromised patients. Extracorporeal membrane oxygenation (ECMO) has emerged as a rescue therapy in patients with refractory hypoxemia during the H1N1 epidemic.The use of veno-venous (VV)-ECMO provides respiratory support for patients with respiratory failure, whereas the use of veno-arterial (VA)-ECMO could be helpful in those with cardiorespiratory failure.10 However, the survival rate of the infected patients with H1N1 who required the use of ECMO varies considerably among the Caucasian and Asian countries (90% survival in Sweden and 83% in the UK13 vs. 35% in Japan). This large discrepancy could be explained with lack of satisfactory equipment, therapeutic guidelines, training of staff, and effective systems allowing patient transfer to the dedicated ECMO centres. Guery and co-investigators described the use of ECMO in two French patients with cardiorespiratory failure secondary to MERS-CoV infection.This has been extended for treatment of refractory hypoxemic respiratory failure during the Saudi MERS-CoV outbreak.

This study will evaluate the effectiveness of an automated voice prompting system on post operative hypoxia within the Postoperative Anesthesia Care Unit (PACU). This will be done to detect an improvement of the patient experience and provider care through a decrease in the number of peripheral capillary oxygen saturation (SpO2) monitor alarms via the patients own ability to follow the instruction and improve their SpO2 levels.

Exposure to acute intermittent hypoxia (AIH) can facilitate of motor output but no studies of sensory effects has been reported.

The investigators will investigate the effect of hypobaria and hypoxia on physiological responses such as: oxygen saturation, heart rate, cerebral blood flow, cerebral oxygenation, brain's activity and concentration performance.

Bronchiolitis is a lower respiratory tract infection (LRTI) syndrome cause by different types of viruses and occurs in young children. Although bronchiolitis is a widespread and fairly common illness in children, pediatricians vary significantly in how it is treated. This includes how children are monitored for their oxygen status when not receiving supplemental oxygen. Studies suggest that continuous pulse oximetry measurement of children admitted to the hospital with bronchiolitis regardless of use of supplemental oxygen prolongs their hospital stay. This increases the cost of care for these patients and increases their risk of hospital-associated complications. This study is a randomized trial of continuous pulse oximeter use in patients admitted with bronchiolitis versus transitioning patients not requiring oxygen to intermittent pulse oximetry monitoring. The investigators hypothesize that this will decrease length of stay as well as associated costs of care and number of medical interventions performed in the hospital.

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 degree to which endurance exercise performance is diminished in acute hypoxia is variable and appears to be the result of several different physiological processes, however this research focuses on hypoxic pulmonary vasoconstriction (HPV). Sildenafil, a pulmonary vasodilator, has been used with mixed results to improve athletic performance in hypoxia. Because sildenafil has been shown to reduce HPV in some individuals, we believe that its effectiveness is closely related to the magnitude of the HPV response and the degree that individual exercise performance declines in hypoxia. This research will investigate the relationship between sildenafil, HPV, and exercise performance.

To study hemodynamic effects of acute normobaric hypoxia during exercise in patients with pulmonary hypertension in a single-center randomized controlled trial.

This study will compare the impact of two systems above low-flow nasal cannula on the arterial oxygen tension in patients with COVID-19. The two systems are the Surgical Mask (SM) and the Double-Trunk Mask (DTM).