August 20, 2009
Behavioral therapy effective in treating insomnia and osteoarthritis
A study in the Aug. 15 issue of the Journal of Clinical Sleep Medicine shows that the use of cognitive behavioral therapy for insomnia (CBT-I) is an effective treatment for older patients with osteoarthritis and comorbid insomnia. According to the study, sleep quality is a major concern for people with osteoarthritis, with 60 percent of people who have the disease reporting pain during the night. Chronic pain initiates and exacerbates sleep disturbance; disturbed sleep in turn maintains and exacerbates chronic pain and related dysfunction.
Michael V. Vitiello, UW professor of psychiatry and behiavioral medicine and lead author of the study, said results indicate that insomnia is not merely a symptom of osteoarthritis but rather a co-existing illness. Vitiello said improving sleep can result in an improvement in osteoarthritis, which is particularly important because, at least in older adults, insomnia rarely exists by itself, rather it typically coexists with other illnesses, pain conditions and depression.
“The particular strength of CBT-I is that once an individual learns how to improve their sleep, study after study has shown that the improvement persists for a year or more,” said Vitiello. “What we and others are showing is that CBT-I can not only improve sleep but that improvement of sleep may lead to improvement in co-existing medical or psychiatric illnesses, such as osteoarthritis or depression, and in the case of our study, that these additional benefits can be seen in the long term.”
A total of 23 patients with a mean age of 69 years were randomly assigned to CBT-I, while 28 patients with a mean age of 66.5 years were assigned to a stress management and wellness control group. Participants in the control group reported no significant improvements in any measure.
CBT-I intervention consisted of eight weekly, two-hour classes ranging in size from four to eight participants. Participants received polysomnographic assessment in their home in order to exclude individuals with sleep apnea. Sleep and pain were assessed by self-report at baseline, after treatment, and (for CBT-I only) at one year follow-up. Sleep logs were recorded prior to and after treatment and at the one year follow-up and included information about sleep latency, wake after sleep onset and sleep efficiency. Subjects were required to be over the age of 55, have insomnia symptoms that have persisted for at least six months and have been diagnosed with osteoarthritis. A majority of the sample was female.
The study showed that treatment improves both immediate and long-term self-reported sleep and pain in older patients with osteoarthritis and comorbid insomnia without directly addressing pain control. Participants who received CBT-I reported significantly decreased sleep latency (initially decreased by an average of 16.9 minutes and 11 minutes a year after treatment) and wake after sleep onset (initially decreased by an average of 37 minutes and 19.9 minutes a year after treatment), significantly reduced pain (initially improved by 9.7 points and 4.7 points a year after treatment) and increased sleep efficiency (initially increased by 13 percent and 8 percent a year after treatment). These improvements persisted in CBT-I patients (19 of 23) who were further assessed for sleep quality and perceived pain at a one-year follow-up visit.
