 On occasion, to measure the degree of muscle weakness or paralysis caused by a muscle relaxant, instead of a single stimulus, trains of stimuli are applied2. One method of repetitive stimulation is to apply four stimuli over a two second period. This method of nerve stimulation is called Train-of-Four TOF. When this form nerve stimulation TOF is applied to patients who have been given nondepolarizing muscle relaxants -there is fade. Fade means that the force of successive muscle contractions is less than the preceding contraction3. The second contraction is less than the first, the third less than the second and so on. The degree of fade appears to have some reasonably well defined relationship to the degree of relaxation produced3. 