Kenneth L. Cummins

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A method is presented for estimating nerve fiber conduction velocity distributions from non-invasive measurements of the compound action potential at two distinct locations separated by a known distance along the nerve bundle. This method is based on a model of the compound action potential as a weighted sum of delayed single-fiber action potentials, but(More)
The electrical stimulus pulse and the surface electrodes commonly used to study compound action potentials of peripheral nerves give rise to an artifact consisting of an initial spike and a longer lasting tail which often interferes with the recorded signal. The artifact has four sources: 1) the voltage gradient between the recording electrodes caused by(More)
A method is described for estimating the distribution of nerve-fiber conduction velocities in a nerve bundle. This method is based on a detailed general model of the nerve bundle compound action potential, which is characterized as a weighted sum of delayed single-fiber action potentials. The non-iterative estimation method is applied to two examples taken(More)
We have estimated the distribution of conduction velocities (DCV) of large myelinated fibers in the median nerves of 10 normal subjects and a patient with amyotrophic lateral sclerosis (ALS) who had a de-efferented hand, using three different computer-based methods: a 2CAP method, which tests both motor and sensory nerve fibers; and 2MAP and CMAP methods,(More)
The distributions of nerve fiber conduction velocities (DCVs) derived from the median nerves of 29 adult diabetic patients (mean age, 52.1 +/- 12.3 years) with mild or no symptoms or signs of polyneuropathy were compared with DCVs from 34 age-appropriate normal subjects. Ten patients (34%) had normal findings (type A DCVs). In the 19 patients (66%) with(More)
We have assessed the clinical applicability of a previously described new method for analyzing the distribution of conduction velocities (DCV) in peripheral nerve. Surface-recorded median sensorimotor compound action potentials (CAPs) were found to contain contributions from classes of fibers conducting between 25 and 80 m/sec in the elbow-to-axilla(More)
[1] The performance characteristics of the U.S. National Lightning Detection Network (NLDN) were evaluated using rocket-triggered lightning data, acquired in the summers of 2001–2003 at the International Center for Lightning Research and Testing (ICLRT), at Camp Blanding, Florida. During the 3-year period, 37 flashes, containing a total of 159 (158 negative(More)
Somatosensory evoked potentials (SEPs) and selected indices of peripheral nerve function were compared in 30 multiple sclerosis (MS) patients and 15 normal controls. A high incidence of delayed SEP onset was observed in the MS patients, correlating with sensory loss--particularly of joint position and vibration sense. Using a method for deriving an indirect(More)