EEG (Electroencephalogram) Test
NEURO PHYSIOLOGYinvestigations are done on 32 Channel Digital Video Recordingmachine from RMS Company.
EEG or electroencephalogram, is a tool used to image the brain while it is performing a cognitive task.
EEG test has a role in assessing brain activity in many conditions or procedures, such as:
- Memory disorders such as Alzheimer’s disease
- Sleep disorders
- Brain surgery or inflammation
- Brain death in coma patients
Precaution & Preparation
- Patient should not consume caffeine before the EEG test.
- Patient should avoid using oil, hair styling products (hairspray or gel) on the day of the exam.
- It is mandatory to bring one attendant for the investigation of EEG.
It is reported by trained Neurologist. When examining the recordings, the neurologist looks for certain patterns that represent problems in a particular area of the brain. For example, certain types of seizures have specific brain wave patterns that the trained neurologist recognizes. Likewise, a normal brain has a specific brain wave pattern that the trained neurologist recognizes. The neurologist looks at all recorded tracings, decides what is normal and what is not, and determine what the abnormal tracings represent.
NCV (Nerve Conduction Velocity Test)
A nerve conduction velocity test (NCV) is an electrical test that is used to determine the adequacy of the conduction of the nerve impulse as it courses down a nerve. This test is used to detect signs of nerve injury.
Why is nerve conduction velocity (NCV) done?
Symptoms that might prompt a referring clinician to order a nerve conduction velocity test include numbness, tingling, and burning sensations. The nerve conduction velocity testcan be used to detect true nerve disorders (such as peripheral neuropathy and mononeuritis multiplex) or conditions whereby nerves are affected by mechanical compression injury (such as carpal tunnel syndrome and other compression neuropathies). A normal body temperature must be maintained for the nerve conduction velocity test because low body temperatures slow the speed of nerve conduction.
An electromyogram (EMG) is a test that is used to record the electrical activity of muscles. When muscles are active, they produce an electrical current. This current is usually proportional to the level of the muscle activity. An EMG is also referred to as a myogram.EMGs can be used to detect abnormal electrical activity of muscle that can occur in many diseases and conditions, including muscular dystrophy, inflammation of muscles, pinched nerves, peripheral nerve damage (damage to nerves in the arms and legs), amyotrophic lateral sclerosis (ALS), myasthenia gravis, disc herniation, and others.
BERA is an electro-physiological test procedure which studies the electrical potential generated at the various levels of the auditory system starting from cochlea to cortex.
Procedure: The stimulus either in the form of click or tone pips is transmitted to the ear via a transducer placed in the insert ear phone or head phone. The waves of impulses generated at the level of brain stem are recorded by the placement of electrodes over the scalp.
Why is BERA Done ?
- It is an effective screening tool for evaluating cases of deafness due to retrocochlear pathology
- Used in screening newborns for deafness
- Used for intra- operative monitoring of central and peripheral nervous system
- Diagnosing suspected demyelination disorders
VER & VEP
The Visually Evoked Response test (VER), also known as the Visually Evoked Potential test (VEP), is a test for Optic Neuritis or other demyelinating events along the Optic Nerve or further back along the optic pathways. VEPs are very sensitive at measuring slowed responses to visual events and can often detect dysfunction which is undetectable through clinical examination.
A doctor may recommend that you go for a VEP test when you are experiencing changes in your vision that can be due to problems along the pathways of certain nerves. Some of these symptoms may include:
- Loss of vision (this can be painful or non-painful);
- Double vision
- Blurred vision
- Flashing lights
- Alterations in colour vision; or
- Weakness of the eyes, arms or legs.