Chronic Pain Clinical Trial
Official title:
Managing Opioid Related Sleep Apnea With Acetazolamide
Patients with chronic pain who use opioids appear to be at increased risk for breathing issues during sleep, termed sleep disordered breathing (SDB). Treatment of SDB often consists of use of a device during sleep that provides continuous positive airway pressure (CPAP) via a mask interface. However, this device is not effective or tolerated in all individuals. The goal of this study is to examine whether a medication called acetazolamide can improve SDB, as an alternative to CPAP treatment. The investigators will measure the improvement in SDB, as well as any change in symptoms, during a 1 week treatment with acetazolamide compared with 1 week of placebo (sugar pill). This study will help to provide data for longer term studies of treatment for SDB in patients who use opioids.
Patients who use chronic opioids for chronic pain daily for >3 months will be recruited. The investigators will study patients with established sleep disordered breathing (SDB; defined as an apnea-hypopnea index (AHI) >/= 10 events/hr). Patients with a prior diagnosis of SDB can enroll provided they can hold their CPAP treatment for the duration of the study. Persons with chronic lung or kidney disease will be excluded, along with those with heart failure, liver failure, kidney disease, medications affecting potassium levels, recreational opioid use, cancer pain, limited life expectancy, prisoners, pregnant women, psychiatric disease other than controlled mood disorders, and those unable to provide consent or cooperate with research procedures. Potential subjects will discuss the planned research protocol, risks, benefits, and alternatives with the study staff. Once the individual has given written informed consent, they will be scheduled for a baseline study visit, which will begin in the early evening. Subjects will undergo a comprehensive history and physical exam, questionnaires examining sleep quality, daytime function, pain, and quality of life. The cold pressor test will be administered, which includes submerging the non-dominant hand in a 4 degree Celsius water bath, and reporting the onset of pain and maximal tolerable submersion time. The subjects will be randomized into two groups: Group A will take acetazolamide 500 mg by mouth nightly for 1 week, followed by placebo (sugar pill) by mouth nightly for 1 week. Group B will take placebo (sugar pill) by mouth nightly for 1 week, followed by acetazolamide 500 mg by mouth nightly for 1 week. There will be a 2 week washout (i.e. no placebo or acetazolamide) between the treatments. The subjects and study staff will be blinded to the treatment that each subject is taking, in order to avoid introducing bias into the results. Study staff will be follow up with a phone call mid-week and will be available by phone if any issues arise. At the end of each week (acetazolamide and placebo conditions), the subject will return for a follow up visit, during which they will undergo the same assessment tools as the baseline visit. They will then be instrumented for an overnight sleep study, which will include the application of electrodes to the scalp (electroencephalogram), beside the eyes (electro-oculogram), chin and legs (electromyogram). Elastic bands will be applied around the chest and abdomen, a pulse oximeter will be affixed to the finger, and airflow monitors placed just inside the nose and outside the mouth. The subject will then be allowed to sleep until the morning. Upon awakening, they will undergo a computer test of alertness. ;
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