Neurophysiology comprises a number of tests. These include, but are not limited to:
- Routine EEG with video monitoring
- Sleep deprived EEG
- Sedation induced sleep EEG with Melatonin
- EEG with photic stimulation
- Ambulatory EEG
- EMG and Nerve Conduction Studies (NCS)
- Evoked Potentials
What is an EEG?
A routine EEG (electroencephalography) is a recording of electrical activity of the brain. The benefit of the test is that it will help your consultant to diagnose if there is a problem and they will then be able to advice any appropriate treatment.
It is mainly used:
- For investigation of unexplained blackouts or other episodic disturbances of brain activity as an aid in diagnosis of epilepsy
- For classification of epilepsy as certain types of epilepsy respond best to certain types of treatment
- For assessment of treatment, underlying cause or prognosis in some forms of epilepsy
- To assess the function of brain in a variety of systemic or brain diseases, which affect mental activity, behaviour, or level of consciousness
- For assessment of abnormal movements and sleep disorders
There are a number of different EEGs. For more information on each one, download the EEG leaflet.
What is an EMG & NCS
The term EMG is often used for both electromyogram (EMG) and nerve conduction studies (NCS). The test is used to diagnose or characterise the disorders of peripheral nerves including any compression over the nerves or nerve roots, muscle disorders, motor neurone disease and disorders of nerve and muscle junction, such as Myasthenia. It is also used to assess the effect of treatment, rate of improvement or deterioration and prognosis for various nerve and muscle disorders.
An EMG produces information that is often complementary to the information obtained by NCS.
What is an Ambulatory EEG
An Ambulatory EEG is a prolonged EEG, which is recorded over 24 or 48 hours. The benefit of the test is that it may help your consultant find what is causing your symptoms or events, perhaps by recording one of them. This should help them to advise you on the appropriate treatment.
What are Evoked Potentials
When the body is exposed to light, sound or touch, the brain responds by making certain types of brain waves. These waves are called Evoked Potentials. Many degenerative disorders of the nervous system are associated with evoked potential abnormalities.