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Circadian rhythms: Their role and dysfunction in affective disorder
Date:8/30/2010

melatonin is especially important for the onset of sleep, but is also involved in many other systems - cardiovascular, immune, endocrine, and metabolic. If rhythms are out of sync, as in depression, then melatonin rhythms also occur at the wrong time thus accentuating the sleep disturbance. Exogenously administered, melatonin acts as a zeitgeber to synchronise circadian rhythms. In addition, its thermoregulatory action is important to induce a rapid onset of sleep, though it is not a sedative agent per se.

Wake therapy (a single night's sleep deprivation) is the most rapid antidepressant available today: approximately 60% of patients, independent of diagnostic subtype, respond with marked improvement within hours. A single night's sleep deprivation induces similar brain changes as many weeks of antidepressant drugs (Benedetti and Smeraldi, 2009). Relapse after recovery sleep can be prevented by daily light therapy, concomitant administration of antidepressants (SSRIs), lithium (for bipolar patients), or a short phase advance of sleep over 3 days. Combinations of these interventions show great promise (Wirz-Justice et al., 2005, 2009).

Despite the growing evidence for the efficacy of the available chronotherapeutic methods, it is surprising how limited the use of these treatments still is. Given the rapid action of chronotherapeutics, lack of side effects, and easy combination possibilities, how can sleep physicians and psychiatrists be educated about their use? Perhaps it is the patients that need to be educated, who are much more interested in non-pharmaceutic approaches? Obviously, treatments that are not patentable do not make profits for industry, thus denying the commercial marketing model used for drugs. Because they do not go through official clinical trial registration at federal regulatory agencies, chronotherapeutic treatments are not on the list for insurance reimbursement. On account of their simplicity, chronotherapeutics contrast w
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Contact: Sonja Mak
s.mak@update.europe.at
431-405-5734
European College of Neuropsychopharmacology
Source:Eurekalert

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