Electrophysiological tests facilities for:
Electroencephalography (EEG)
The electrical activity of brain is recorded by this test. The record is analysed for abnormalities in brain rhythm.
EEG is done in the following conditions:
The EEG is useful for diagnosis to decide about medication, in monitoring the response to treatment and in long term follow up to evaluate the course of the disease.
Details of Procedure:
Instructions :
Report Information:
The report will provide information about the presence or absence of abnormalities (es/o epilepsy) and the state of the patient if there is an altered sensorium. The report is finalized by the Senior Doctor and provided within 24 hours or immediately if urgent.
Video EEG
What is VEEG?
Video EEG is a non-invasive diagnostic tool that records the electrical activity of your brain as well as your physical behavior.
What is the aim of VEEG?
VEEG aims to observe what is happening during a seizure or an event along with brain activity recorded via EEG simultaneously.
Duration can vary from 1 to 7 hours or > 24 hours, depending on the indication for the test; doctors can suggest VEEG when the nature of the event is not clear, or want to determine the origin of the seizure.
Why is it done?
Video EEG is helpful to find out what is happening in your brain & also record your physical activity at the same time.
VEEG is also helpful if you have any of the following neurological conditions such as-
Role and Benefit of VIDEO-EEG
How is VEEG Performed?
Preparation:
Before performing the Video-EEG test, a technician will give you a few instructions as follows –
You must wash your hair and dry it properly before coming for the test.
Don’t apply any hair oil after hair wash.
You can take your routine medications.
Fasting is not required, you can take your breakfast or lunch.
You can carry your comfortable clothes, sheets & pillow, etc.
The procedure of the test:
The technician measures your head and marks where to place electrodes.
Areas marked are cleaned with the Nuprep gel.
Electrodes are attached to the scalp with 10 – 20 paste.
Technicians can apply cotton to hold it in place, the head & electrodes are covered by gauze dressing.
The room is kept clean, dark, and quiet, at your comfortable temperature and in dim light.
There can also be a small music system to help you relax.
A technician should check the audio, the video is on & camera is on focus.
Complete instructions are given to you so that you can relax and then the recording will be started.
If technicians see any event during recording, they should write the timing of the event and give a few commands to the patient like-
EMG
The EMG test is used to evaluate the status of the muscles, nerves, roots and anterior horn cells. A number of neurological disorders present with weakness or atrophy (thinning) of muscles.
Some common disorders are:
The EMG may be done either alone or in combination with nerve conduction studies (NCS) depending on the neurological disorder.
Common symptoms of muscle involvement:
Details of Procedure:
Nerve Conduction Studies (NCS)
Procedure:
Instructions-Before the Test:
Indication for NCS:
Role of Nerve Test for Nerve Injury
Repetitive Nerve Stimulation (RNST)
Repetitive nerve stimulation tests are a special type of nerve conduction study. Rather than a single electric shock, a brief series of shocks is applied to a motor nerve and responses are recorded from a muscle supplied by that nerve. The study is generally performed before and after brief exercise of the muscle. Serial response amplitudes are recorded. Repetitive nerve stimulation is useful for evaluating myasthenia gravis and other disorders of neuromuscular transmission.
Role of Repetitive Nerve Stimulation Test
Visual Evoked Potential (VEP)
VEP provides information regarding conduction in visual pathway from the retina to brain (occipital cortex).
VEP is recommended for following diseases:
Impairment of vision due to:
Details of Procedure:
Instructions:
Brainstem Auditory Evoked Potential (BAER)
This test examines the integrity of auditory pathway through the brainstem. The sound enters ear canal and stimulates auditory nerve. The electrical impulse travels from auditory nerve through the brainstem to auditory cortex. During testing, the patient hears the repetitive click sound through the earphone.
BAER is recommended for following diseases:
Details of Procedure:
Instructions:
Somatosensory (SSEP)
This test examines the sensory system from the peripheral nerve to the sensory cortex of brain. Weak electrical stimuli are applied to the peripheral nerve, for example median or ulnar nerve for upper extremity study and tibial nerve for lower extremity study.
SSEP is recommended for following diseases:
Details of Procedure:
Instructions: