EPS
REPETITIVE NERVE STIMULATION (RNS) (FOR MYASTHENIA GRAVIS) (Upper Limb and Face)
Also Known As:
REPETITIVE NERVE STIMULATION (RNS) (FOR MYASTHENIA GRAVIS)
About This Test
Repetitive Nerve Stimulation (RNS) is a specialized electrodiagnostic test used to assess the function of the neuromuscular junction—the point where nerves communicate with muscles. It is most commonly used to diagnose disorders like Myasthenia Gravis (MG) and other conditions that cause fatigable muscle weakness. During the procedure, small electrical pulses are delivered repeatedly to a motor nerve at a slow or rapid frequency. Surface electrodes placed on the skin record the muscle’s electrical response to each stimulus.
In healthy individuals, muscle responses remain fairly consistent. However, in neuromuscular junction disorders, the muscle response gradually decreases, showing a characteristic “decrement pattern.” This helps doctors identify abnormalities in nerve-to-muscle signal transmission. The test is safe, non-invasive, and provides crucial information that cannot be obtained through routine neurological examinations. RNS also assists in monitoring disease progression and evaluating treatment effectiveness for conditions involving fatigable weakness.
Home Collection
✗ Not Available
Reports Available In
1 Day
Preparation / Prerequisite
1. No special requirements.
2. Patient may feel some pain of needle pricks / current stimulation
3. Apply no body lotion.
4. Bring old record.
5. Patient required to lie down with no movement .
6.Following directions of applying force in opposite direction is important for test. So it is not possible in small children who can not follow directions. Similarly it is not possible after oral / IV sedation.
7. wearing loose clothes.
Frequently Asked Questions
An Electrophysiology Study checks electrical signals in the heart to detect rhythm problems.
Patients with unexplained palpitations, fainting or irregular heartbeat.
Yes, it is done in a cardiac lab by specialists.
Most patients go home the same day or next day.
It is generally safe when performed by trained cardiologists.
TAT Policy
The Turnaround Time (TAT) depends on the following factors:
- Registration date and time
- Type of scan or test
- Scan time or sample collection time
In uncommon circumstances, TAT may be delayed due to test complexity or reasons beyond our control. You will be informed of the estimated TAT at the time of registration.
