NERVE CONDUCTION STUDIES (NCS OR NCV):

Many of the nerves, especially of upper and lower limbs, are tested by stimulating them at multiple sites with a small harmless current mimicking the natural impulse, and recording from a muscle or over the skin by sticking ECG type electrodes. Any compression or damage to the nerve along its path is detected and its severity known. A tingling current like sensation is felt, which is absolutely harmless, and does not interfere with even pacemakers, and is easily tolerated by all age groups.

 

ELECTROMYOGRAPHY (EMG):

 

examines which muscle is weak due to nerve problem or muscle disease. It involves inserting a very fine acupuncture type 27G sterile disposable needle and recording muscle activity, much like the ECG. Mild discomfort of the needle may be felt and there may be a slight oozing from the site. The international guidelines allow the test to be carried out even with high INR with precautions.

 

SOMATO SENSORY EVOKED POTENTIALS (SSEP):

Involves stimulating the nerves at ankle or wrist and recording over spinal cord and skull (much like EEG) to know the integrity and conduction in the spinal and brain pathways.