View clinical trials related to Hypercapnia.
Filter by:1. To study the efficacy and safety of high flow nasal oxygenation using high velocity nasal insfflation technique(HiVNI) in comarison with non invasive positive pressure ventilation in COPD patients with acute hyercapnic respiratory failure 2. To do selection criteria for the indication of this new physiological technique in critically ill COPD patients
High pressure NIV is a pressure limited ventilation, stating IPAP pressure at 20 cmH2O and gradually increasing pressure up to 30 cmH2O according to patient tolerance.
This study compares a volume targeted pressure support non-invasive ventilation with an automatic PEP regulation (AVAPS-AE mode) to a pressure support non-invasive ventilation (S/T mode) in patients with acute hypercapnic respiratory failure with acidosis. This study focuses on patients at risk of obstructive apneas or obesity-hypoventilation syndrom (BMI≥30 kg/m²). Half of participants (33 patients) will receive non invasive ventilation with AVAPS-AE mode, the other half will receive non-invasive ventilation with S/T mode.
In this randomized cross over study the investigators will evaluate the effects on gas exchange and patients' tolerance of a new CO2 non rebreathing devices incorporated in the mask vs the traditional mask COPD patients undergoing NIV for an episode of Acute Hypercapnia Respiratory Failure, will be randomized after at least 12 hour of ventilation to 1 h.trial with the usual full face mask or the same mask with the addition of a new CO2 clearance device
We made a fortuitous observation of periodic breathing in a healthy subject coming to our outpatient mountain medicine consultation at Avicenne hospital in Bobigny (France). During this consultation, subjects perform a hypoxia exercise test, which allows a good prediction of their risk factors for severe high altitude illnesses. Surprisingly, breath-by-breath recording of the ventilation signal showed a periodic breathing pattern, which increased when the subject started to exercise in hypoxic conditions and was maintained during normoxic exercise. Therefore, our objective was to confirm this observation in a retrospective study led in 82 subjects who passed this test. We tested the hypothesis that subjects with a brisk ventilatory response to hypoxia might show a more pronounced periodic pattern of ventilation, due to a higher gain of the chemoreceptor feedback loop. Then, our objective is to investigate the mechanisms involved in the periodic pattern in healthy subjects, as a function of exercise intensity, altitude intensity, role of peripheral and central chemoreceptors to O2 and CO2. Finally, we want to investigate the possible role of this ventilatory instability in patients with obstructive or central apneas.
For some upper ureteral and renal stones,ureteroscopic lithotripsy needs to be performed under general anesthesia with interrupted suspension of mechanical ventilation, which could result in hypercapnia and hypoxia. In this study, the investigators hypothesize that 10 cmH2O PEEP added to the respiratory circuit with 1 L/min 100% oxygen might extend the time of ventilation suspension but have no effect on carbon dioxide retention in blood.
The patients affected by severe chronic respiratory failure can develop hypercapnic decompensation leading to coma and death in a few hours. At present, the main treatment is noninvasive or invasive ventilation. The noninvasive invasive ventilation requires a minimum of consciousness to insure spontaneous ventilation. In case of noninvasive ventilation impossibility, invasive mechanical ventilation is proposed to patients, which is an aggressive therapy. Regularly, the patients undergo this aggressive therapy without having expressed their opinion. Indeed, a great majority of these patients with severe respiratory insufficiency did not anticipate directives in case of respiratory decompensation (acceptation of aggressive treatments). Efficiency of these aggressive therapies is still uncertain but certainly alters quality of life (discomfort, loss of autonomy…). After complete, clear, loyal and adapted information, a majority of patient do not wish to go on these aggressive therapies. At the time of the decompensation, the patients are incapable to express an opinion because of the hypercapnic narcosis. An extracorporeal CO2 remover device, such as the DECAP CO2, would quickly decrease the hypercapnia what would allow the patient to improve his state of consciousness and so to find the conditions of spontaneous ventilation required for the noninvasive ventilation. The DECAP CO2 device can be used to stop quickly the hypercapnic narcosis and to collect the wills of the patient on the choice of possible aggressive therapies. It is in this last condition that we wish to estimate the DECAP CO2 device.
The purpose of this study is to determine how intraocular pressure responds to changes in the levels of carbon dioxide or oxygen that a healthy individual inspires.