Electroencephalograms (EEG) and electromyograms (EMG) are diagnostic tests used to measure electrical activity within the body. An electroencephalogram tests electrical activity in the brain, and an electromyogram is used to evaluate electrical activity in muscles.

Electroencephalography (EEG)

An electroencephalogram is a diagnostic procedure that records brain wave patterns to detect irregularities in the electrical activity of the brain. EEG’s are frequently used to diagnose or monitor seizures and can also useful for other issues such as:

  • Dementia
  • Epilepsy
  • Head injuries
  • Loss or changes in consciousness
  • Psychiatric conditions
  • Sleep disorders
  • Strokes
  • Tumors

Electromyography (EMG)

An electromyogram is used to detect diseases or conditions affecting muscle tissue, nerves, or the junctions between nerve and muscle that cause weakness, twitching, or paralysis. The diseases and conditions are generally categorized as:

  • Neuropathies
  • Neuromuscular junction diseases
  • Myopathies

EMG’s help differentiate weakness due to a possible injured nerve or a neurologic disorder. Below are some diseases or conditions that an EMG is used to diagnose:

  • Amyotrophic lateral sclerosis (ALS)
  • Carpal tunnel syndrome
  • Charcot-Marie-Tooth disease
  • Guillain-Barre syndrome (GBS)
  • Myasthenia gravis
  • Muscular dystrophy
  • Herniated discs