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Oxygen Toxicity clinical trials

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NCT ID: NCT06401941 Completed - Oxidative Stress Clinical Trials

Selected Lysosomal Enzyme Activities and the Oxidant-antioxidant Balance in Hyperbaric Oxygen Condition.

Start date: April 26, 2016
Phase: N/A
Study type: Interventional

The aim of the research project was to investigate the effects of hyperbaric oxygen (HBO) treatment on the redox equilibrium in individuals with different pathological conditions. Both hyperbaric oxygenation and the pathological condition are associated with redox imbalance (oxidative stress), however, HBO is successfully used in the treatment of chronic wounds, e.g., diabetic foot syndrome, as well as in sudden and acute hearing loss, e.g., acute acoustic trauma or idiopathic sudden sensorineural hearing loss.

NCT ID: NCT05831228 Enrolling by invitation - Oxygen Toxicity Clinical Trials

Effects of Pre-dive Ketone Food Products on Latency to CNS Oxygen Toxicity (Aim 2)

Start date: September 1, 2023
Phase: N/A
Study type: Interventional

The purpose of this study is to understand how ketogenic food products affect oxygen toxicity in undersea divers. Oxygen toxicity affecting the central nervous system, mainly the brain, is a result of breathing higher than normal oxygen levels at elevated pressures as can be seen in SCUBA diving or inside a hyperbaric (pressure) chamber. This is a condition that may cause a wide variety of symptoms such as: vision disturbances, ear-ringing, nausea, twitching, irritability, dizziness, and potentially loss of consciousness or seizure. Because nutritional ketosis has been used to reduce or eliminate seizures in humans, it may be beneficial to reduce oxygen toxicity as well. The investigators hope this study will provide a help to develop practical and useful methods for improving the safety of undersea Navy divers, warfighters and submariners.

NCT ID: NCT05801120 Enrolling by invitation - Oxygen Toxicity Clinical Trials

Effects of Pre-dive Ketone Food Products on Latency to CNS Oxygen Toxicity (Aim 1)

Start date: May 1, 2023
Phase: N/A
Study type: Interventional

The purpose of this study is to understand how ketogenic food products affect oxygen toxicity in undersea divers. Oxygen toxicity affecting the central nervous system, mainly the brain, is a result of breathing higher than normal oxygen levels at elevated pressures as can be seen in SCUBA diving or inside a hyperbaric (pressure) chamber. This is a condition that may cause a wide variety of symptoms such as: vision disturbances, ear-ringing, nausea, twitching, irritability, dizziness, and potentially loss of consciousness or seizure. Because nutritional ketosis has been used to reduce or eliminate seizures in humans, it may be beneficial to reduce oxygen toxicity as well. The investigators hope this study will provide a help to develop practical and useful methods for improving the safety of undersea Navy divers, warfighters and submariners.

NCT ID: NCT05761756 Recruiting - Seizures Clinical Trials

Oxygen Toxicity: Mechanisms in Humans

Start date: November 28, 2023
Phase: N/A
Study type: Interventional

The goal of this clinical trial is to learn about the mechanisms of oxygen toxicity in scuba divers. The main questions it aims to answer are: - How does the training of respiratory muscles affect oxygen toxicity? - How do environmental factors, such as sleep deprivation, the ingestion of commonly utilized medications, and chronic exposure to carbon dioxide, impact the risk of oxygen toxicity? - How does immersion in water affect the development of oxygen toxicity? Participants will be asked to do the following: - Undergo a basic screening exam composed of health history, vital signs, and some respiratory function tests - Train their respiratory muscles at regular intervals - Exercise on a cycle ergometer both in dry conditions and underwater/under pressure in the context of medication, sleep deprivation, or carbon dioxide exposure Researchers will compare the performance of each subject before and after the possible interventions described above to see if there are changes in exercise performance, respiratory function, cerebral blood flow, and levels of gene expression.

NCT ID: NCT05737407 Recruiting - Clinical trials for Anesthesia; Adverse Effect

Lung Ultrasound Guided Choice of Best Positive End-Expiratory Pressure in Neonatal Anesthesia

Start date: March 1, 2023
Phase: N/A
Study type: Interventional

The goal of this RCT is to demonstrate that, in neonatal anesthesia, the use of Lung Ultrasound (LUS) to guide choice of best Positive End-Expiratory Pressure (Peep) - the one that efficiently avoids lung atelectasis - leads to better gas exchange in the lung thus can lead to reduction of FiO2 applied to ventilatory setting in order to achieve same peripheral saturations of oxygen (SpO2). Specific aims of the study are: 1. to determine if LUS-guided PEEP choice in neonatal anesthesia, compared to standard PEEP choice, can lead to reduction of FiO2 applied to the ventilatory setting in order to maintain same SpO2s. 2. to determine if patients treated with LUS-guided PEEP will develop less postoperative pulmonary complications in the first 24 hours. 3. to compare static respiratory system compliance between groups. 4. to determine if there is a significant difference in hemodynamic parameters and amount of fluids infused or need for vasopressors between the two groups.

NCT ID: NCT05590130 Recruiting - Respiratory Failure Clinical Trials

Comparison of Two Oxygenation Targets With Two Different Oximeters - Impact on Oxygen Flow Rates and Oxygenation

Oxygap pong
Start date: November 16, 2022
Phase: N/A
Study type: Interventional

The investigators recently evaluated 4 different oximeters among the most commonly used with arterial catheter in place and compared SpO2 with SaO2 obtained on arterial gas. Correlations between SaO2 and SpO2 were poor for all oximeters, as previously known, and SpO2-SaO2 bias were different between oximeters. Some oximeters (Masimo, Nellcor) had lower biases but they detected less well hypoxemia. Some oximeters underestimated SaO2 (Nonin) but detected very well hypoxemia, and some overestimated SaO2 (Philips). The investigators concluded that oximeters provide different informations to clinicians, and oxygenation targets should take into account for these differences. The assumption is that the SpO2 target AND oximeter used will both have an impact on oxygen flows and that these effects will add up. With a high SpO2 target, oxygen flows will be significantly greater and with the Nonin oximeter, the required flows will be greater than with the Philips oximeter. NB: the results obtained were in a population with light skin pigmentation (96% of the patients were Fitzpatrick 1-2, reflecting the local hospitalized population).

NCT ID: NCT05508308 Completed - Prematurity Clinical Trials

Automated Versus Manual Control Of Oxygen For Preterm Infants On Continuous Positive Airway Pressure In Nigeria

Start date: September 13, 2022
Phase: N/A
Study type: Interventional

One in ten babies are born preterm (<37 weeks gestation) globally. Complications of prematurity are the leading cause of death in children under 5 years, with the highest mortality rate in Sub-Saharan Africa (SSA). Low flow oxygen, and respiratory support - where an oxygen/air mixture is delivered under pressure - are life saving therapies for these babies. Bubble Continuous Positive Airway Pressure (bCPAP) is the mainstay of neonatal respiratory support in SSA. Oxygen in excess can damage the immature eyes (Retinopathy of Prematurity [ROP]) and lungs (Chronic Lung Disease) of preterm babies. Historically, in well-resourced settings, excessive oxygen administration to newborns has been associated with 'epidemics' of ROP associated blindness. Today, with increasing survival of preterm babies in SSA, and increasing access to oxygen and bCPAP, there are concerns about an emerging epidemic of ROP. Manually adjusting the amount of oxygen provided to an infant on bCPAP is difficult, and fearing the risks of hypoxaemia (low oxygen levels) busy health workers often accept hyperoxaemia (excessive oxygen levels). Some well resourced neonatal intensive care units globally have adopted Automated Oxygen Control (AOC), where a computer uses a baby's oxygen saturation by pulse oximetry (SpO2) to frequently adjust how much oxygen is provided, targetting a safe SpO2 range. This technology has never been tested in SSA, or partnered with bCPAP devices that would be more appropriate for SSA. This study aims to compare AOC coupled with a low cost and robust bCPAP device (Diamedica Baby CPAP) - OxyMate - with manual control of oxygen for preterm babies on bCPAP in two hospitals in south west Nigeria. The hypothesis is that OxyMate can significantly and safely increase the proportion of time preterm infants on bCPAP spend in safe oxygen saturation levels.

NCT ID: NCT05414370 Recruiting - Acute Lung Injury Clinical Trials

Hyperoxia Induced Pulmonary Inflammation and Organ Injury: a Human in Vivo Model

Start date: December 2, 2022
Phase: N/A
Study type: Interventional

Oxygen is the most commonly administered therapy in critical illness. Accumulating evidence suggests that patients often achieve supra-physiological levels of oxygenation in the critical care environment. Furthermore, hyperoxia related complications following cardiac arrest, myocardial infarction and stroke have also been reported. The underlying mechanisms of hyperoxia mediated injury remain poorly understood and there are currently no human in vivo studies exploring the relationship between hyperoxia and direct pulmonary injury and inflammation as well as distant organ injury. The current trial is a mechanistic study designed to evaluate the effects of prolonged administration of high-flow oxygen (hyperoxia) on pulmonary and systemic inflammation. The study is a randomised, double-blind, placebo-controlled trial of high-flow nasal oxygen therapy versus matching placebo (synthetic medical air). We will also incorporate a model of acute lung injury induced by inhaled endotoxin (LPS) in healthy human volunteers. Healthy volunteers will undergo bronchoalveolar lavage (BAL) at 6 hours post-intervention to enable measurement of pulmonary and systemic markers of inflammation, oxidative stress and cellular injury.

NCT ID: NCT05146700 Active, not recruiting - Trauma Clinical Trials

Restrictive vs. Liberal Oxygen in Trauma

TRAUMOX2
Start date: December 10, 2021
Phase: Phase 4
Study type: Interventional

Victims of trauma are often healthy individuals prior to the incident, but acquire numerous complications including sepsis and pulmonary complications and diminished quality of life after trauma. According to Advanced Trauma Life Support guidelines, all severely injured trauma patients should receive supplemental oxygen. The objective of TRAUMOX2 is to compare the effect of a restrictive versus liberal oxygen strategy the first eight hours following trauma on the incidence of 30-day mortality and/or major respiratory complications (pneumonia and acute respiratory distress syndrome) within 30 days (combined primary endpoint).

NCT ID: NCT05088772 Completed - Oxygen Toxicity Clinical Trials

Pulmonary Function After Hyperbaric Oxygen Therapy

Start date: February 2016
Phase:
Study type: Observational

Patients receiving hyperbaric oxygen therapy (HBOT) for any indication at the Hyperbaric Medicine Unit (University Health Network, Toronto, ON, Canada) from 2016-2021 were recruited to this prospective cohort study. While receiving HBOT (at 2.0-2.4 ATA, with 1-3 "air breaks", with specific treatment details determined on a case-by-case basis and directed by the clinical team), enrolled patients underwent pulmonary function testing prior to HBOT treatment and serially after each 20 completed treatment cycles.