NCT01041924

Dynamic Carbon Dioxide (CO2) Administration for Sleep Apnoea

Dynamic Carbon Dioxide Administration for Central Sleep Apnoea in Heart Failure

• Status: Unknown
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 24 (estimated)
• Sponsor: Imperial College London · Academic / Other
• Sex: All
• Age: 18 Years – 80 Years
• Healthy volunteers: Not accepted

Summary

Normally breathing is controlled by a reflex that responds to the levels of carbon dioxide (CO2) in the blood. In heart failure, where the heart muscle is damaged and therefore does not pump as well, this reflex is exaggerated. The result is a vicious circle: blood CO2 levels fluctuate wildly and as a result breathing also fluctuates with patients hyperventilating at times and briefly stopping breathing at others. During sleep this is called central sleep apnoea (CSA). Patients with CSA wake up throughout the night and whilst some patients are oblivious to this, others are consciously breathless and many patients are tired during the day and feel unable to perform their daily activities. As part of the body's stress response to the erratic pattern of breathing, both blood pressure and heart rate may rise to a level that is harmful in a failing heart, exacerbating the underlying heart failure. Indeed patients who demonstrate this CSA die sooner than those who have heart failure and stable breathing. There are no proven specific therapies for CSA that stabilise breathing, improve sleep quality, and prolong life. We have designed a system which delivers very small doses of CO2, when the blood level of CO2 is predicted to be low. During short daytime recordings, using this system, we have demonstrated that it is possible to stabilise the body's CO2 levels. We aim to test what happens when CO2 is given overnight whilst the patient is sleeping to see whether we can stabilise their breathing over longer durations and whether sleep quality could be improved so that patients are less tired during the day. In addition, we would like to measure whether the stress response is lessened if the breathing is successfully stabilised.

Conditions

• Sleep Apnea, Central

Interventions

Type	Name	Description
OTHER	Carbon dioxide	2% inhaled CO2 for up to 8 hours.
OTHER	Carbon dioxide	Up to a maximum of 2% CO2, only delivered for a maximum of up to 20 seconds per 60 seconds for 8 hours

Timeline

• Start date: 2010-02-01
• Primary completion: 2010-10-01
• Completion: 2010-10-01
• First posted: 2010-01-05
• Last updated: 2010-01-05

Locations

2 sites across 2 countries: Italy, United Kingdom