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Significantly increased jitter was present in PPS patients as compared to normal controls at all 5 stimulation frequencies studied.
There may be several reasons for the finding of increased jitter with HFS in only 1/3 of PPS patients.
Those PPS patients with abnormal jitter had a significantly longer time since their acute polio.
Dinsmore et al [65] studied the effect of high dose prednisone in 17 PPS patients (with new muscle weakness ).