General

Synonym/Acronym:
Electrodiagnostic study, EMG, neuromuscular junction testing.

Rationale
To assess the electrical activity within the skeletal muscles to assist in diagnosing diseases such as muscular dystrophy, Guillain-Barré, polio, and other myopathies.

Patient Preparation
There are no food or activity restrictions unless by medical direction. Under medical direction, the patient should avoid muscle relaxants, cholinergics, and anticholinergics for 3 to 6 days before the test. Instruct the patient to abstain from smoking and drinking caffeine-containing beverages for 3 hr before the procedure. Protocols may vary among facilities.

Normal Findings

• Normal muscle electrical activity during rest and contraction states.

Critical Findings and Potential Interventions
N/A