Active clinical trials for "Hypoxia"

Bronchiolitis is a common cold weather seasonal respiratory illness affecting infants and children. Multiple supportive therapies have been tried in infants with bronchiolitis including albuterol, racemic epinephrine, hypertonic saline nebulization, but to date supportive therapy with oxygen is the only proven therapy to decrease respiratory distress in infants with bronchiolitis, with hypertonic saline showing a borderline statistically significant improvement. This prospective, randomized study will compare CSS and PEWS scores on infants who receive oxygen by standard flow nasal cannula and to those who receive oxygen via Humidified High-Flow Nasal Cannula (HHFNC). The results will help determine if infants with viral bronchiolitis who receive humidified high flow nasal cannula oxygen therapy have improved Clinical Severity Score (CSS) and Pediatric Early Warning System (PEWS) scores and ultimately decreased lengths of admissions when compared to patients treated with nasal cannula oxygen therapy with/without bronchodilator therapy. Hypothesis Heated Humidified High-flow Nasal Cannula Delivery of Oxygen decreases respiratory distress as measured by pediatric CSS and PEWS when compared with routine nasal cannula oxygen delivery in infants with bronchiolitis.

The purpose of this study is to see if the cells in rectal cancer are oxygen-starved, or hypoxic. We know that as cancers grow bigger, parts of them are cut off from the oxygen supply and they become hypoxic, basically, lacking oxygen. Research has shown that cells that are oxygen-starved respond differently to treatment such as chemotherapy and radiation when compared to cells that are oxygen rich.

In the study the value of capnography for avoiding complications during sedation for ERCP is evaluated.

In patients with both COPD and CHF, moderate chronic hypoxemia is caused by a combination of intrapulmonary and extrapulmonary factors. The hypothesis of this study is that adequate medical therapy for both conditions can correct the moderate hypoxemia by improving the underlying mechanisms without the need of LTOT. If this hypothesis is correct, the study will provide a valuable information to the Italian Agency of drugs (Agenzia Italiana del Farmaco, AIFA) to reduce the inappropriate use of LTOT for COPD patients with moderate hypoxemia and CHF, and will help the Italian National Health Service to reduce both the direct and indirect costs of unnecessary LTOT.

Respiration failure type 2 is loss of the lungs ability to take up oxygen (O2) and get rid of carbon dioxide (CO2). The diagnosis is based on blood gas measurement of pressures of O2 and CO2. Patients with COPD is often seen to have co-morbidity with cardiac diseases. Chronic systemic inflammation is seen in both COPD and cardiac diseases. The investigators will investigate the sleep quality, CO2-retention, O2-saturation, cardiac arrythmias and markers of inflammation in 120 patients with COPD in different stages of the disease. Our hypotheses are: that the first signs of respiration failure type 2 is seen during sleep with alteration of sleep patterns and greater and more long-lasting retention of CO2 in the blood compared to those with a normal lung function that the use of alcohol, zopiclone or supplementary oxygen will make these differences even greater that cardiac arrythmias correlates with hypoxemia that cardiac arrythmias and respiration failure correlates with degree of inflammation

Elucidating cerebrovascular control mechanisms during physiologic stress may help identify novel therapeutic targets aimed at preventing or reducing the impact of cerebrovascular disease. The physiological stressors of hypoxia and hypercapnia will be utilized to elicit increases in cerebral blood flow (CBF), and intravenously infused drugs will allow for the testing of potential mechanisms of cerebrovascular control. Specifically, the contributions of nitric oxide synthase (NOS), cyclooxygenase (COX), and reactive oxygen species (ROS) to hypoxic and hypercapnic increases in CBF will be examined. The concept that these mechanisms interact in a compensatory fashion to ensure adequate CBF during both hypoxia and hypercapnia will also be tested. ~25 young, healthy men and women will be tested at rest and during hypoxia and hypercapnia. Subjects will participate in two randomized, counterbalanced study visits under the following conditions: inhibition of NOS, NOS-COX, and NOS-COX-ROS or inhibition of COX, COX-NOS, COX-NOS-ROS. During hypoxia, arterial oxygen saturation will be lowered to 80% and end-tidal carbon dioxide will be maintained at basal levels. During hypercapnia arterial carbon dioxide will be increased ~10 mmHg above basal levels and arterial oxygen saturation will be maintained. Blood flow velocity will be measured with transcranial Doppler ultrasound in the anterior (middle cerebral artery; MCA) and posterior (basilar artery; BA) circulations as a surrogate for CBF. It is hypothesized that both NOS and COX independently contribute to hypoxic and hypercapnic vasodilation in the MCA and BA, combined NOS-COX contribute to hypoxic and hypercapnic vasodilation in MCA and BA to a greater extent than either NOS or COX alone, and NOS-COX-ROS contribute to hypoxic and hypercapnic vasodilation in the MCA and BA to a greater extent than NOS-COX.

Inflamed joints in patients with rheumatoid arthritis and psoriatic arthritis are characterized by low oxygen levels and inflammation. We propose to investigate whether tiny bubbles (nanobubbles) when given in a drink can alter oxygen level in joints. These nanobubbles are so small that they can enter the bloodstream when given as a drink. This information will give new information on the role of oxygen in joint inflammation and could possibly lead to new treatment approaches in the future.

The purpose of this project is to evaluate the efficacy of oxygen insufflation (continuous oxygen flow) to keep oxygen saturation (oxygen levels measured with a pulse oximeter [finger device used in medicine]) at 90% or greater in adult patients undergoing microlaryngoscopy surgery.

Anesthesia induction is associated with hemodynamic imbalances that can affect the blood flow to major organs. Moreover it can result in deoxygenation as well. During standard anesthesia induction the patient is manually ventilated with a circle-valve-mask system until the effect of muscle relaxant shows of. Near-infrared spectroscopy (NIRS) is a modification of a well-known peripheral pulse oxymetry that is used in the detection of the regional oxygen saturation (rSO2) in organs, including brain, liver, muscle, and intestines. In this study we will compare the regional oxygenation status of the patients during anesthesia induction in which either standard manual ventilation or mechanical ventilator-assisted ventilation was performed. AutoFlow(R) mode of Draeger-Perseus mechanical ventilator will be used for the ventilator-assisted ventilation.

This trial will assess chemosensitivity differences of the carotid bodies in individuals with T2DM, compared to healthy controls. During baseline and hyperinsulinemia.