Prognostic Value of Tumor Hypoxia, as Measured by 18F-FMISO Breath Hold PET/CT, in Non-Small-Cell-Lung...
Non-Small-Cell-Lung Cancer (NSCLC)The purpose of this study is to help researchers investigate if a new imaging agent named 18F-FMISO can predict if patients with lung cancer will respond to standard therapy, as well as whether disease will reoccur in the future. The study will also investigate whether a 18F-FDG PET scan in the middle of radiation treatment can predict if lung cancer will respond to standard therapy. Information obtained from this study may help doctors design future studies in which they may target tumor areas that do not respond to therapy or may likely reoccur in the future.
Cervix Hypoxia FAZA
Cervix CancerThe purpose of this study is to look for low levels of oxygen (hypoxia) in your cervix cancer using a special x-ray test called a positron emission tomography (PET)scan. Hypoxia may have an effect on how cervix cancer grows and responds to treatments like radiotherapy and chemotherapy. Doctors at Princess Margaret Hospital have measured hypoxia in over 300 patients. The use of PET scans to measure hypoxia may be better and simpler than the methods used previously.
The Effect of Hyperoxia and Hypoxia on Fluorescence Lifetime Imaging Ophthalmoscopy in Healthy Subjects-...
To Investigate the Effect of 100% Oxygen Breathing on Fluorescence Lifetime Imaging Ophthalmoscopy (FLIO) in Healthy SubjectsThe present study aims to investigate whether FLIO can also detect shorttime changes in retinal metabolism induced by hyperoxia and hypoxia. For this purpose, 48 healthy subjects will be included in the present study and changes in FLIO will be assessed during breathing of 100% oxygen to induce hyperoxia as well as during breathing of 12% oxygen in nitrogen to induce hypoxia. Since stimulation with flickering light also induces a higher metabolic demand in the retina (functional hyperemia), thisprovocation test will also applied during breathing of the different gas mixtures and compared to baseline. To gain information about retinal blood flow, optical coherence tomography angiography (OCT-A) will be performed. The results of the present study can help to gain more insight into the physiology of the retinal metabolism and might give grounds to establish new biomarkers in future studies.
PEEP in Patients With Acute Respiratory Failure
Acute Respiratory Failure With HypoxiaPositive end-expiratory pressure (PEEP) has become an essential component of the care of critically ill patients who require ventilatory support. In 1975, several investigators published the effects of PEEP in 15 mechanically ventilated patients with acute respiratory failure (ARF) supported by mechanical ventilation. FiO2 ranged between 21% to 75% and the tidal volume between 13 to 15 mL/kg. PEEP was increased in 3 cmH2O steps until cardiac output fell. The aim was to identify the "optimum" PEEP level. "Best" PEEP was associated simultaneously with the best static compliance of the respiratory system, the greatest oxygen transport, and the lowest dead space fraction. That study established the basis for the use of PEEP in patients with ARF worldwide. Although currently patients with ARF are ventilated with much lower tidal volumes, that study has never been validated. It is unknow whether their findings are currently valid, generalizable, and reproducible.
Effect of Acetazolamide on Lung Water Content by Ultrasound in Lowlanders Older Than 40 Years at...
Altitude HypoxiaRandomized, placebo controlled trial evaluating the effect of acetazolamide on lung water content by ultrasound in lowlanders older than 40 years travelling from 760 m to 3'100 m.
Physiological Adaptations to Simulated Intermittent Altitude on Human Health and Performance
Altitude HypoxiaThe investigators expect to find that different intensity and altitude exposure levels will show what kind of intermittent exposure protocol is more beneficial to athletes and healthy individuals that experience acute exposure to altitude during exercise. This may furthermore be related to acute altitude exposure for recreational exercise use as well.
Oxygen Targets in Acute Heart Failure With Pulmonary Congestion
Acute Heart FailurePulmonary Congestion1 moreThis investigator-initiated, prospective, randomized, blinded, multi-center, controlled trial will investigate the effect of a restrictive vs. liberal oxygenation-strategy in patients hospitalized with acute heart failure with pulmonary congestion. Patients will be randomized 1:1 in the emergency department to either liberal or restrictive oxygenation after providing informed written consent. Liberal oxygenation group = SpO2 target of 96%. Restrictive oxygenation group = SpO2 target of 90%. The allocation will be concealed through the use of an oxygen-delivery robot, termed O2MATIC. The study will include 122 patients.
Pulse Oximetry Errors in Hospitalized Patients Across Varying Skin Pigmentation
HypoxemiaPulse Oximetry1 moreThis is a prospective observational study designed to quantify and understand errors in pulse oximetry in hospitalized patients in relation to their skin pigmentation. It is driven by three recent retrospective studies showing missed diagnosis of hypoxemia in patients across a spectrum of skin pigmentation, defined as blood SaO2 <90% when their pulse oximeter reads 92% or greater.
Exploring Pulse OXimeter Accuracy Across SKin Tones
Critical IllnessHypoxemiaThis study within a trial (SWAT) will be a sub-study of the UK-ROX trial (ISRCTN13384956), which is currently running in intensive care units across the UK. UK-ROX is large-scale randomised controlled trial evaluating conservative oxygen therapy (a target SpO2 of 88-92%) versus usual oxygen therapy in mechanically ventilated adult patients admitted to ICUs in the UK. The purpose of this observational sub-study is to compare pulse oximeter-derived peripheral oxygen saturation (SpO2) values to co-oximeter-derived arterial oxygen saturation (SaO2) measurements from arterial blood gas (ABG) samples, for a range of fingertip pulse oximeters in an ethnically diverse group of adult patients admitted to UK intensive care units (ICUs). Approximately 900 patients will be recruited over 12 month period from 24 sites to provide an anticipated 10,800 paired SpO2 and SaO2 measurements. Patient skin tone will be objectively measured using a handheld spectrophotometer. Data from the sub-study will be used to determine the accuracy of the tested pulse oximeters across a range of skin tones and arterial oxygenation levels.
PK and Safety of Caffeine in Neonates With Hypoxic Ischemic Encephalopathy Receiving Therapeutic...
Acute Kidney InjuryHypoxic-Ischemic Encephalopathy1 moreA phase 1 study investigating the tolerability and pharmacokinetics of caffeine citrate in neonates with hypoxic ischemic encephalopathy receiving therapeutic hypothermia. This study is an essential first step to develop caffeine as a kidney protective medication in this in this vulnerable group of newborns.