Diagnostic Techniques, Part 2
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Fall 1990
Volume 1, Number 3
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Abstracts
of this issue appear
below. Send e-mail or call 303-788-4010 to order a printed copy.
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 Abstracts
Cerebral Blood
Flow Analysis
Richard E. Latchaw, MD, Jerome D. Sutherland, MD
Cerebral blood
flow analysis may be performed with a variety of
techniques, such as computed tomography during inhalation
of stable xenon, positron emission tomography, and single
photon emission computed tomography. These techniques are
not simply esoteric exercises, but help in solving
difficult clinical problems and directing patient
management. The methodology of each technique, its
advantages and disadvantages, and its role in patient
management are discussed.
Computer-Assisted Electrodiagnosis
Paul M. Levisohn, MD
Computer-assisted
electrodiagnosis allows for more sophisticated analysis
of electroencephalograms (EEG) including quantitative
analysis of the EEG background, as well as data reduction
and spike recognition. These techniques, which complement
but do not replace routine EEG interpretation, are aiding
in clinical diagnosis of patients with neurologic
disease, including cerebrovascular disease, dementia and
epilepsy. Concepts, techniques, and clinical utilization
of these techniques are discussed.
Quantification
of Sensation in Peripheral Nerve Disorders
Neil L. Rosenberg, MD
Quantification
of sensation has become more accurate and easier to
perform in recent years because of the commercial
availability of relatively inexpensive electromechanical
devices. Sensory modalities which can now be quantified
by such devices include tactile, thermal, vibration and
current perception. Quantitative sensory testing (QST) is
the term used to describe these types of quantifying
sensory functions. The testing format most commonly
employed is the "two-alternative forced choice
method." The QST methods are reliable, reproducible,
cause no discomfort to the patient and are more sensitive
than conventional electrodiagnostic methods
(electromyography) for the detection of mild disorders of
peripheral nerves, particularly those associated with
dysfunction of the small fiber populations. Quantitative
sensory testing should be considered in the evaluation of
disorders of peripheral nerves, including diabetes,
uremia, and carpal tunnel syndrome, as well as other
disorders where sensation is altered.
Electromyography
and Nerve Conduction Studies: Clinical Uses
Marc M. Treihaft, MD
Considered an
extension of the neurological examination,
electromyography and nerve conduction studies provide
information for the evaluation of neuromuscular
disorders. Advances in signal acquisition and
computer-assisted analysis have increased the diagnostic
sensitivity of conventional studies. This article reviews
the clinical use of standard techniques and the
application of newer developments such as single-fiber
electromyography and central electromyography.
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