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ADHD, Sleep Disorders, and other General Medical Conditions: Recommendations for DSM V | OMICS International
ISSN: 2167-0277
Journal of Sleep Disorders & Therapy
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ADHD, Sleep Disorders, and other General Medical Conditions: Recommendations for DSM V

Youssef NA*
Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham VA Medical Center, University of South Alabama, USA
Corresponding Author : Dr. Nagy A. Youssef
MD, Department of Psychiatry and Behavioral Sciences
Duke University Medical Center
Durham VA Medical Center
University of South Alabama, USA
Tel: +919-286-0411
Fax: +919-416-5912
E-mail: [email protected]
Received February 23, 2012; Accepted February 23, 2012; Published March 01, 2012
Citation: Youssef NA (2012) ADHD, Sleep Disorders, and other General Medical Conditions: Recommendations for DSM V. J Sleep Disord Ther 1:e106. doi:10.4172/2167-0277.1000e106
Copyright: © 2012 Youssef NA. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The diagnosis of Attention Deficit Hyperactivity Disorder (ADHD) in children and adults appears to be increasing in the last couple of decades. A 1996 UN report found an eight fold increase in stimulant use for ADHD in the preceding decade [1]. This increase could be attributed to many causes. In this editorial, I want to point out the possibility of this increase could be, in part, due to misdiagnosis of an underlying primary disorder. A proportion of ADHD patients (diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) may have sleep disorders and other medical disorders contributing to a secondary ADHD.
This issue is discussed in this editorial because it may represent an important public health issue. Although it might seem obvious to some clinicians that ADHD is a diagnosis of exclusion, exclusion of sleep disorders or medical causes does not commonly occur in clinical practice before starting patients on long term stimulant medications (with potential burdensome consequences to both adult and pediatric patients). Moreover, using DSM IV criteria as a research tool to include patients in an ADHD clinical trial, for instance, could include a substantial number of patients with ADHD that is due to sleep disorders or other medical disorders.
Lack of attention to this issue is probably due to the fact that the DSM-IV criteria do not include ‘ADHD due to General Medical Condition’ (GMC) (in contrary to most other psychiatric disorders). This may give the clinician the assumption that ADHD is only a primary diagnosis. The lack of inclusion of such criterion in DSM-IV is perhaps due to the paucity of studies examining this line of research at the time of publication of DSM-IV in 1994.
Nonetheless, in the last several years, there has been accumulating evidence to indicate that patients can suffer from Syndromal and subsyndromal ADHD due to other causes. These other medical condition may include thyroid disorders [2], periodic limb movement disorder (PLMD) [3], restless legs syndrome [3], and obstructive sleep apnea (OSA) [4-9].
Our group has recently published a systematic review that suggested that 20-30 % of patients diagnosed with ADHD might have OSA [9]. Treatment of sleep apnea resulted in marked improvement in ADHD symptoms. In some cases, stimulant treatment was not required anymore for ADHD symptoms [7,10]. This is analogous, for instance, to mood disorder due to hypothyroidism in which treatment of the primary disorder, hypothyroidism, results in improvement or disappearance of mood symptoms.
The consequence of inaccurate diagnosis may lead to unnecessary use of stimulants or other ADHD medications (and its adverse effects); and lack of treatment of the primary disorder. Perhaps that is what led Sir William Osler to warn that “Diagnosis, not drugging, is our chief weapon of offence.” Also, from the Hippocratic perspective, looking at the bigger picture is crucial.
Although data are still emerging concerning ADHD due to GMC, clinicians should be vigilant not to overlook similar kinds of scenarios in a proportion of ADHD patients. It would also be helpful to include this as an exclusion criterion in the next version of DSM (and ICD). Adding it to the formal diagnostic manuals would have a utilitarian value by: (a) avoiding misdiagnoses in this subgroup of ADHD patients by clinicians (b) fostering further studies to better understand and define this crucial issue by researchers.
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