Nerve Conductions Studies

These are electrical tests which are used to test the function of peripheral nerves in the body. It measures function of sensory nerves (which transmit sensation from the peripheries to the brain) and these also test motor nerves (which transmit impulses from brain leading in muscle action). The tests provide useful information in diagnosis and prognosis of peripheral nerve disorders. The tests provide information on localisation, nature and severity of nerve disorders and injuries. The tests can sometimes provide information on prognosis of nerve disorders and injuries. During the test, surface recording electrodes are attached to skin or the over the muscles supplied by the particular nerve. They are either stick-on or Velcro-on pads. The hand held stimulating electrode is placed on skin over the area of the nerve to be tested. Brief electrical pulses are delivered by the stimulating electrode. The pulses can be slightly uncomfortable but are generally not too painful. The recording electrode picks up the impulses conducted through the nerves. Distance between the stimulating and the recording electrodes is measured by the recording physician or physiologist. Nerve conduction studies machine calculates time taken for the impulse to travel and conduction velocity and also measures size of the transmission response wave. The recording physician then analyses the data and formulate results. NCS is generally a safe procedure. You should inform neurophysiologist if you have a cardiac pacemaker or any electrical devices fitted. You can download patient information leaflet for further information.

EMG-Electromyography

The tests provide information on function of muscle and the motor nerves supplying the muscles. The tests provide useful information on diagnosis and prognosis of nerve disorders, muscle disorders. During the test a fine needle electrode is inserted into a muscle. The needle records electrical signals from within the muscle. No electrical pulses are delivered. After the initial needle prick sensation, the test is generally painless and well tolerated. The recoding physician records electrical activity when the muscle is at rest. The recording physician then asks the patient to contract the muscle and records electrical activity while doing so. The recording physician then analyses the data and formulate results. EMG is generally a safe procedure. You should inform neurophysiologist if you regularly take blood thinning medications such as Asprin, Clopidogrel, Warfarin, Apixaban and like medications. You can download patient information leaflet for further information.