Active clinical trials for "Hypoxia"

Low pulse oximetry is the most common adverse events during sedation for upper gastrointestinal endoscopy. The main reason is the glossoptosis after sedation. In present study a new designed nasopharyngeal airway embedded with jet ventilation catheter(WEI NASAL JET) will be utilized in order to reduce the hypoxia. At the same time the safety will be evaluated.

The purpose of this pilot study is to determine whether obese adults,obese (BMI>30 kg/m2) with obesity hypoventilation or obese COPD-patients do undergo oxygen desaturation under flight simulation and if the hypoxic altitude simulation test is as effective as the hypoxic chamber test.

The intent of this study is to determine the difference in pharyngeal oxygen concentration in patients who have a natural airway (not intubated) using commonly available oxygen delivery systems. The investigators will test the hypothesis that oxygen concentration during the period of inspiration (FiO2) in the pharynx is dependent on oxygen delivery system design, even at high flow (15 liters/minute) oxygen delivery. Specific measurements include oxygen concentration at subjects' lips and pharynx when breathing 100% oxygen and room air via a simple mask, non-rebreather mask, OxyMaskTM, and anesthesia mask with headstrap and Jacson Rees circuit. A mean difference of 10% pharyngeal FiO2 between any of the masks will be considered clinically important. The expected standard deviation of the within-subject FiO2 is 3.5%. With a significance criterion of 0.05, 10 subjects would provide more than 90% power to detect a mean difference of 10%.

The general aim of this study is to define the response to hypoxic challenge in patients with diabetes. The investigation will provide response for different questions that are central for explaining the development of complications in diabetes have patients with diabetes an impaired reaction to adapt to hypoxia what consequence has hypoxia challenge on respiratory and on cardiovascular regulation in patients with diabetes what consequence has diabetes on the angiogenetic response to hypoxia

With exposure to high altitude some individuals will develop acute mountain sickness (AMS). Current evaluation of AMS can make it difficult to rule out other possible conditions. Evaluation of ataxia, as measured by the performance of a coordinated task, can aide in the correct diagnosis of AMS. The investigators have developed novel finger-tapping tasks on a mobile device to assess both reaction time and accuracy. The proposed research will evaluate the utility of this tool in assessing human acclimatization to hypoxia.

The purpose of this study is to conduct a SpO2 hypoxia evaluation of the Oxitone Medical Oxitone 1000 pulse oximeter. The Oxitone 1000 pulse oximeter will be evaluated during non-motion conditions over the range of 70-100% SpO2 in comparison to a Reference Pulse Oximeter. The study is observational in nature which quantifies device performance and accuracy in compassion to a Reference Pulse Oximeter.

This study is intended to evaluate performance of the new design sufficiently to support performance claims for an FDA 510K submission or ISO technical file. Specifically: SpO2 value range 70% to 100% 10 or more subjects, at least 3 of dark pigmentation At least 200 data points Meeting the following test required by the 2013 FDA Guidance on Pulse Oximeters - Premarket Notification Submissions and by ISO 80601-2-61 on Pulse Oximeters: 2013 FDA Guidance on Pulse Oximeters - Premarket Notification Submissions: 4.1. ACCURACY OF PULSE OXIMETERS 4.1.1 IN VIVO TESTING FOR SPO2 ACCURACY UNDER LABORATORY CONDITIONS ISO 80601-2-61:2011 Annex EE.2 and clause 201.12.1.101.2 201.12.1.101 SpO2 accuracy of pulse oximeter equipment 201.12.1.101.2 Determination of SpO2 accuracy

Pulmonary Hypertension (PH) is a severe disease with a bad prognosis. However, thanks to extensive research in this field, there are more and better treatment options that allow patients to participate in recreational activities at moderate altitude or bring up the question of air-travel. Still very few is known about the effects hypoxic conditions have on PH patients. The aim of this study is to investigate the effects of hypoxia in comparison to normoxia and hyperoxia on pulmonary hemodynamics in patients with pulmonary hypertension during routine right heart catheterisation. We aim to get insight into the pathophysiology of pulmonary hemodynamics under hypoxic conditions in comparison to normoxia and hyperoxia in patients with pulmonary arterial and chronic thromboembolic pulmonary hypertension compared with control patients, that are scheduled for right heart catheterisation due to dyspnea but have no PH.

The purpose of this study is to evaluate the SpO2 accuracy and performance of the Cadwell Pulse Oximetry system during non-motion conditions over the range of 70-100% SaO2 as compared to arterial blood samples assessed by CO-Oximetry for SpO2 validation. The end goal is to show the SpO2 accuracy performance of the Cadwell Pulse Oximetry System. It is expected that the Accuracy Root Mean Square (Arms) performance of the Cadwell Pulse Oximetry System will meet a specification of 3 or better in non-motion conditions for the range of 70-100% SaO2 thereby demonstrating an acceptable SpO2 accuracy performance specification.

The aim is to define in detail metabolic pathways at rest and during aerobic exercise in normal and healthy men and women under normobaric normoxic and moderate hypoxic conditions, using metabolomics technologies based on minimally invasive sampling relying on gas chromatography and mass spectrometry.