F-wave

The F-wave is a test for measuring the conduction velocity of the proximal nerve end of the nerve and diagnosing various peripheral neurological diseases. The recording electrode is placed on the small finger muscle (ulnar nerve), the thumb short abductor muscle (median nerve) or the upper and lower limbs other muscles (pre-orbital muscle, gastrocnemius, etc.) surface electrodes are stimulated in the superficial part of the proximal cardiac nerve trunk. The stimulation intensity is larger than that of the induced motion (super strong stimulus), and the F wave appears after the M wave, and the latency of the F wave in the shortest time is measured, and the F wave conduction velocity is calculated according to the following formula. Basic Information Specialist classification: neurological examination classification: neuroelectrophysiology Applicable gender: whether men and women apply fasting: not fasting Tips: Pay attention to rest and diet before the test to prevent excessive fatigue. Normal value The normal ulnar nerve wrist stimulation was 53.7-66.7 m / s average 61.7 m / s, elbow 52.3-72.3 m / s, an average of 62.3 m / s. Clinical significance Abnormal results: damage to the cranial, spinal, plexus, nerve, nerve, and peripheral nerves. 1 hereditary peripheral neuropathy. 2 traumatic embedding peripheral neuropathy. 3 inflammatory peripheral neuropathy. 4 metabolic peripheral neuropathy. 5 toxic peripheral neuropathy. 6 ischemic, vasculitic or peripheral vascular obstructive neuropathy. 7 malignant peripheral neuropathy. 8 peripheral nerve tumors, etc. People who need to be examined: people with the above diseases. Precautions Taboo before the examination: poor rest, improper diet, excessive fatigue. Requirements for inspection: Actively cooperate with the doctor's work. The stimulation intensity should reach the limit stimulation and avoid recording the H wave. When recording the F-wave latency, the shortest one should be selected, and the sensitivity of the amplifier should be adjusted appropriately. Inspection process The recording electrode is placed on the small finger muscle (ulnar nerve), the thumb short abductor muscle (median nerve) or the upper and lower limbs other muscles (pre-orbital muscle, gastrocnemius, etc.) surface electrodes are stimulated in the superficial part of the proximal cardiac nerve trunk. The stimulation intensity is larger than that of the induced motion (super strong stimulus), and the F wave appears after the M wave, and the latency of the F wave in the shortest time is measured, and the F wave conduction velocity is calculated according to the formula. Not suitable for the crowd Inappropriate crowd: None. Adverse reactions and risks Nothing.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.