EMG is particularly useful in evaluating which two peripheral nerve conditions?

• A. Deep vein thrombosis and varicose veins
• B. Diabetic neuropathy and carpal tunnel syndrome
• C. Migraine and tension headaches
• D. Osteoarthritis and rheumatoid arthritis

Answer: (B)

EMG measures how nerves activate muscles and, with nerve conduction studies, how fast those nerve signals travel. This makes it especially useful when a problem involves the nerves themselves, such as when a nerve is damaged or compressed.

For diabetic neuropathy, prolonged high blood sugar damages peripheral nerves. EMG/NCS can show abnormalities in nerve conduction and muscle activity that reflect a peripheral polyneuropathy, helping confirm the diagnosis, assess severity, and monitor progression.

For carpal tunnel syndrome, the median nerve is compressed at the wrist. Nerve conduction studies typically reveal slowed conduction across the carpal tunnel, and EMG can detect changes in the muscles that the median nerve controls. This helps confirm entrapment and guide treatment decisions.

These tests aren’t primarily used for vascular issues like deep vein thrombosis or varicose veins, nor are they the first choice for headaches (migraine or tension) or arthritis (joint diseases).