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Focal and/or Lateralized Polymorphic Delta ActivityAssociation With Either 'Normal' or 'Nonfocal' Computed Tomographic Scans
Douglas W. Marshall, MD;
Robin L. Brey, MD;
Michael W. Morse, MD
Arch Neurol. 1988;45(1):33-35.
Abstract
• Focal continuous polymorphic delta activity (PDA) is classically taught to be associated with destructive lesions of cerebral white matter. One hundred patients with focal or lateralized continuous PDA recorded by an electroencephalogram who also had computed tomographic (CT) scans of the head performed at approximately the same time were studied. Thirty-three percent had normal or "nonfocal" abnormalities on their CT scans. Most of these had a history of either seizures (51%) or transient cerebral ischemia/stroke (27%); however, a wide variety of causes were possible. This high percentage of patients with focal continuous PDA without corresponding CT scan lesions supports the concept that the electroencephalogram is a physiologic study that is complementary to anatomic imaging techniques.
Author Affiliations
From the Department of Neurology, Wilford Hall, US Air Force (USAF) Medical Center, Lackland Air Force Base (AFB), Tex (Drs Marshall and Brey), and Scott and White Clinic, Temple, Tex (Dr Morse).
Footnotes
Accepted for publication Sept 3, 1987.
The views expressed herein are those of the authors and do not necessarily reflect the views of the US Air Force or the Department of Defense.
Reprint requests to SGHMN, Wilford Hall, USAF Medical Center, Lackland AFB, TX 78236-5300 (Dr Marshall).
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