View clinical trials related to Hypoxia.
Filter by:The project will test the hypothesis that lung ventilation during exercise is unaffected by oxygen supplementation. In addition, the acute effect of oxygen supplementation on dyspnoea, heart rate and blood pressure will be studied.
Intraoperative intravenous fluid management practice varies greatly between anesthesiologists. Postoperative fluid based weight gain is associated with major morbidity. Postoperative respiratory complications are associated with increased morbidity, mortality and hospital costs. The literature shows conflicting data regarding intraoperative fluid resuscitation volume. No large-scale studies have focused on intraoperative fluid management and postoperative respiratory dysfunction. Hypotheses: Primary - Liberal intraoperative fluid resuscitation is associated with an increased risk of 30 day mortality Secondary - Liberal intraoperative fluid resuscitation is associated with increased likelihood of postoperative respiratory failure, pulmonary edema, reintubation, atelectasis, acute kidney injury and peri-extubation oxygen desaturation.
There are limited therapeutical options for patients with secondary dystonia due to cerebral palsy. Pharmacotherapy is often without effect, or side effects are severe. Meanwhile deep brain stimulation (DBS) has proven to be a safe and effective therapy for patients with parkinson´s disease or primary / idiopathic dystonia. Experiences with DBS in patients with dyskinetic cerebral palsy are limited with heterogeneous data. With STIM-CP we investigate the effect of DBS on quality of life in young patients with a dyskinetic movement disorder (dyskinetic cerebral palsy) due to perinatal hypoxic brain injury. Additionally, the effect of DBS on motor development, speech, memory, attention, cognition and pain perception will be assessed.
Prostate cancer is the most commonly diagnosed form of cancer in Canadian men. In 2006, greater than 250,000 men were diagnosed with prostate cancer in the United States and Canada with more than 32,000 men dying of their disease. Using the prognostic variables of T-category, the serum prostate specific antigen (PSA), and the pathologic Gleason score (GS), men with localized prostate cancer are placed in low, intermediate and high-risk groupings. Usually this is treated with surgery, radiation therapy, hormone therapy and/or watchful waiting (also known as active surveillance). While these treatments are quite effective, tumours are likely to recur in about 40% of cases. There is a need for additional prostate cancer treatments. To address this need, many experimental therapies are being developed and tested in mice with prostate tumors. This includes the study of aggressive prostate cancer cells such as stem cells, or Tumour Initiating Cells (TICs), or oxygen deprived cells, which may be the ones most likely to re-grow into a tumour or spread throughout the body. Researchers want to try and isolate these special cells from the prostate after surgery to study their features, and to see if they can re-grow as solid tumours in mice. Researchers would like to test whether the prostate cancer stem cells are more resistant or less resistant to treatments. This will allow researchers to study and test new treatments that specifically target resistant and aggressive prostate cancer cells. The investigators hypothesize that marker-defined TIC cells or hypoxic cancer cells have unique genetics in primary prostate cancers and are relatively chemo- and radio-resistant.
The purpose of this study is to compare heat and humidified oxygen with cold and dry oxygen in children with bronchiolitis. The hypotheses are that heating and humidifying inspired low flow supplemental oxygen will optimize mucociliary function thereby, 1) improve oxygenation, 2) decrease work of breathing, and 3) decrease length of hospital stay.
The purpose of this study is to compare cardiovascular physiological adaptation to intermittent hypoxia (IH) of nonobese healthy subjects. The exposure will be two periods of two weeks (IH versus exposure "placebo hypoxia"). The investigators will use pharmacological tools, peripheral vasodilator (amlodipine) or specific blocker of angiotensin receptor (valsartan) versus the taking of a placebo. The allocation of the tool and the exhibition will be randomized (HI / placebo, valsartan / amlodipine). The outcome measures evaluated concern the cardiovascular system, systemic inflammation and tissular and glucose metabolism. The investigators assume an increase in arterial resistance during the intermittent hypoxia compared to the control group, these being dependent on sympathetic tone. The investigators hypothesize that the metabolic alterations that will be observed after experimental simulation (IH and fragmentation of sleep for 15 consecutive nights) will be less severe in the valsartan group than in the amlodipine group in comparison with the placebo group. A serum bank and a gene bank will be performed for the requirements of subsequent studies if necessary.
In endotracheal intubation, it is essential that the trachea is intubated and not the esophagus. In suboptimal situations (outside an operating theatre), malpositioning of the endotracheal tube occurs frequently and is often fatal. The diagnostic tools that are available in the operating theatre are not appropriate for out-of-hospital situations because of several reasons. Moreover, these methods mostly take some time to provide the desired information and don't have optimal specificity and sensitivity. In order to allow fast diagnosis of this potentially fatal complication, we have developed a fully-automatic detection device to diagnose endotracheal tube malpositioning within 2 seconds. A high sensitivity/specificity of the algorithm for waveform-analysis was demonstrated in healthy patients and patients with pulmonary diseases (decreased pulmonary compliance). A new stand-alone device with integrated sensors and microprocessor was developed that gives immediate diagnosis, and stores data for subsequent research purpose. This device will be evaluated in perioperative situations to demonstrate the high sensitivity and specificity in patients in a clinical setting.
Despite recent advances in the care of mothers and newborn infants, many infants (approximately 20 per 1000 live births) continue to need resuscitation at birth. A proportion of these infants will have sustained significant injury through interruption of their blood and oxygen supply prior to delivery (perinatal asphyxia). In 2-3 babies per 1000 this will lead to brain swelling and the risk of long term brain injury called neonatal hypoxic-ischaemic encephalopathy (HIE). HIE remains a cause of neonatal death and long term disability. Early and accurate prediction of outcome would allow us to intervene during the window of the first 6 hours following birth, prior to secondary reperfusion and secondary brain injury. Estimating severity of injury can be difficult in newborn infants. Condition at birth does not predict neonatal, or longer term outcome. Biomarkers which could be measured at the time of birth and analysed at the bedside would offer these infants the best chance of timely and effective intervention. Through the BIHIVE study we have identified a number of predictive biomarkers in hypoxic-ischaemic encephalopathy. These markers are present in umbilical cord blood and have been identified through proteomic and metabolomic analysis of a stored biobank of samples from a recruited cohort of infants with perinatal asphyxia and hypoxic-ischaemic encephalopathy. We now wish to validate these biomarkers in an additional cohort, and will continue to explore new biomarkers in our stored biobank of umbilical cord samples. In addition we wish to assess our ability to predict neurodevelopmental and behavioural outcome in these infants. In this way we will determine the most robust biochemical and clinical markers for the prediction of early and medium term outcome in HIE. This study will establish the evidence base and validation of these biomarkers to the point where they can be developed into a bedside diagnostic algorithm which can be used in the labour ward to immediately identify those infants at risk of HIE in time to prevent secondary damage.
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.
Liberal fluid administration is one of risk factors of developing acute lung injury (ALI) in thoracic surgery. Therefore, the investigators try to restrain fluid administration, and in the case of intraoperative hypotension, the investigators often administer vasoactive agents or inotropes. One lung ventilation (OLV) which is routinely employed for thoracic surgery decrease arterial oxygenation and oxygen delivery to brain can be also decreased. In this study, the investigators compared dopamine and phenylephrine in respect to maintaining cerebral oxygen saturation in major thoracic surgery. The investigators hypothesis is that dopamine is better than phenylephrine to maintain cerebral oxygen saturation in thoracic surgery.