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Evaluation of CO2 Rebreathing During Exercise With the Increasing Ventilation Assisted by NIV With a Dual-limb Circuit

Chronic Obstructive Pulmonary Disease Clinical Trial

Official title:
Evaluation of Carbon-dioxide Rebreathing During Exercise With the Increasing Ventilation Assisted by Noninvasive Ventilation With a Dual-limb Circuit

Clinical Trial Summary

Ventilated by a single-limb tubing with PEV caused CO2 rebreathing to COPD patients during exercise with the increasing ventilation. The aim of this study was to evaluate whether CO2 rebreathing could be avoided with the use of the dual-limb circuit, to provide a theoretical basis of more rational clinical application of NIV in the setting of increasing ventilation(eg, after exercise).

Clinical Trial Description

Exercise training is a key component of pulmonary rehabilitation. It has shown signifcant improvements in both exercise tolerance and quality of life in patients with COPD. The intensity of exercise training is of great importance to yield a true physiologic effect. However, in patients with severe COPD, exertional dyspnea and leg fatigue make it impossible for the patient to maintain intensity of training for enough time to achieve a physiologic training effect. NIV has been reported to be used as support for exercise to improve exercise tolerance and respiratory performances in patients with mild-to-severe COPD with inconsistent results. Evidence from previous studies have suggested that NIV with a single-limb circuit with Whisper Swivel II expiratory valve or Plateau exhalation valve assisted during exercise in patients with COPD caused CO2 rebreathing. CO2 rebreathing may have a negative impact on efficacy. Previous studies have proved that exercise tolerance was improved ventilated by NIV with a dual-limb circuit. In theory, NIV with a dual-limb circuit consists of one inhalation limb that introduces air into the patient's airways and one exhalation limb that leads exhaled gas outside of the airways, there is no risk of rebreathing. However, there was no report on whether there's no risk of rebreathing in COPD patients ventilated during exercise by a dual-limb circuit. Therefore, the aim of the study was to determine whether there was no CO2 rebreathing occurred assisted with NIV with dual-limb circuit in patients with stable severe COPD after exercise with exertional dyspnea. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT03554460
Study type Interventional
Source Guangzhou Institute of Respiratory Disease
Contact
Status Completed
Phase N/A
Start date June 23, 2018
Completion date March 31, 2019
View Details
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