myasthenia reaction

myasthenia reaction

[‚mī·əs·thēn·ē·ə ri′ak·shən]
(medicine)
The electromyographic reaction observed in myasthenia gravis in which there is a gradual loss of intensity and duration for the tetanic contraction, and a gradual diminution in amplitude and frequency of motor unit discharges until the muscle is fatigued.