Electromyography
Nerve Conduction Study
Exam.
A test that applies electrical stimulation to muscles and analyzes the nerve response, providing a precise diagnosis of motor unit disorders.
Purpose and Diagnosable Conditions
A useful test for identifying disorders of the motor unit within the nervous system. Used to diagnose muscle disorders, peripheral nerve disorders, nerve root disorders, and neuromuscular junction disorders.
Testing Steps
Nerve Conduction Study
Surface electrodes deliver electrical stimulation to peripheral nerves, measuring conduction velocity, amplitude, and latency. Usually takes 20 to 40 minutes.
Electromyography (EMG)
A thin needle electrode is inserted into the muscle to analyze electrical activity at rest and during contraction, checking for muscle or nerve abnormalities.
Results Analysis
Waveform, conduction velocity, and latency data are compiled, and the physician interprets the location and severity of the problem to determine a treatment plan.
Electrocardiogram (ECG)
Electrodes attached to the skin detect the heart's electrical activity, which is recorded as a line trace on graph paper.
Performed for symptoms of heart disease such as chest pain, shortness of breath, palpitations, or dizziness, or as part of a routine checkup.
If findings such as arrhythmia are suspected, an echocardiogram is used to confirm more detailed results.