PMC5628322_01
Surface electromyography recording from left medial gastrocnemius and tibialis anterior when standing: regular alternating bursts of motor unit potentials at a rate of 15 Hz.
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Surface electromyography (EMG) of the medial gastrocnemius and tibialis anterior muscles demonstrated 16 Hz regular alternating tremor bursts (Figure 1), which appeared immediately after standing (Video 1).
Regular sound immediately after standing (helicopter sign) and disappearing with sitting down is a unique feature of orthostatic tremor.
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Postoperative localization of the active electrodes (computed tomography-MRI fusion) showed the active electrode (contact 3 cathodal; contact 1 anodal) to be 12 mm lateral, 6 mm posterior, and 3.5 mm superior to the mid-commissure point (MC) on the left and 12.6 mm lateral, 6 mm posterior, and 3.5 mm superior to the MC on the right (Figure 2).