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Ernest W Johnson

Publications and source records attributed to Ernest W Johnson.

7 recordsLinked to original sources
PubMed2005

A novel technique for recording from the serratus anterior.

OBJECTIVE: To design an electrodiagnostic technique by which to accurately record the serratus anterior compound muscle action potential (CMAP). DESIGN: Observational study. SETTING: Academic electromyography laboratory. PARTICIPANTS: Fifteen healthy volunteers. INTERVENTIONS: The long thoracic nerve was stimulated by using a standard bipolar surface electrode in the axilla, just anterior to the midaxillary line. The serratus anterior CMAP was recorded by using a self-adhesive, 8.0 x 0.5 cm, ring electrode as the E1 placed across the serratus anterior interdigitations starting at the nipple level. A self-adhesive, motor (1 x 1 cm) electrode was used as E2 and placed over the seventh rib. A standard self-adhesive ground electrode was placed over the inferior region of the latissimus dorsi. MAIN OUTCOME MEASURES: Distal motor latency (DML), and CMAP amplitude and duration. RESULTS: After removing 2 outliers, the results are reported as the mean +/- 1.96 standard deviations. Right long thoracic DML was 2.2+/-1.0ms and the left was 2.3+/-0.9ms, with a side-to-side mean difference of 0.3+/-0.4ms. The right serratus CMAP amplitude was 3.8+/-3.9mV and the left was 3.9+/-3.7mV, with a side-to-side mean difference of 0.6+/-1.2mV. Statistical analysis did not reveal a significant side-to-side difference for DML or CMAP amplitude. Both sides were combined to form a single set of trials for DML and CMAP amplitude. The mean DML became 2.2+/-0.7ms, and the CMAP amplitude was 3.5+/-1.9mV. The CMAP duration was 14.5+/-4.3ms on the right and 14.5+/-4.1ms on the left. A significant, positive correlation existed between height and DML ( P <.02). The 95% confidence intervals for DML and CMAP amplitudes were 2.1 to 2.5ms and 1.5 to 3.1mV, respectively. CONCLUSIONS: Our latency, side-to-side comparisons and amplitude data were consistent with other motor nerve conduction findings in the literature. Stimulating the long thoracic nerve in the axilla will provide a reliable technique to aid in the diagnosis and treatment of long thoracic neuropathy.

Action Potentials↗
PubMed2003

Intrathecal baclofen for spasticity management in Rett syndrome.

Intrathecal baclofen infusions have proven to be effective for management of spasticity during the last two decades. Efficacy of intrathecal baclofen for spasticity of spinal origin has been well established and has shown promise in treatment of spasticity that is not spinal in origin. Rett syndrome is a neurodevelopmental disorder primarily affecting girls and women. Manifested in the advanced stages of this syndrome is increased spasticity leading to functional decline. Presented is a case report of a 32-yr-old white woman with Rett syndrome, diagnosed before the age of 2 yr, and significant spasticity that was successfully managed with intrathecal baclofen. After placement of an intrathecal baclofen pump, the dose was increased slowly during 1 yr to 800 microg/day with good clinical response. There was observed a significant decrease in upper and lower limb Ashworth scores, from an average of 3-4 to 2-3, during this 1-yr period. The decrease in spasticity in this patient eventually led to improved range of motion, positioning, skin care, hygiene, and quality of life. Intrathecal baclofen is an effective option in managing severe spasticity from Rett syndrome.

Adult↗