PMC:4630263 / 9923-11017 JSONTXT

{"project":"TEST0","denotations":[{"id":"26527349-61-67-1499010","span":{"begin":367,"end":369},"obj":"[\"16481825\"]"}],"text":"For cVEMP testing, the active electrode was placed on the upper one-third of the sternocleidomastoid (SCM) muscle, ipsilateral to the sound stimulation, with the reference electrode on the anterior margin of the clavicle and the ground electrode on the forehead. Patients were tested in a seated position. To contract the SCM, we used the blood pressure cuff method [27]. Subjects had to flex the head ~30° forward and rotate it ~30° to the opposite side. While holding the cuff between the right hand and jaw, the subject pushed with her head against the hand-held cuff to generate a cuff pressure of 40 mmHg. The obtained cuff pressures and background muscle activity based on visual feedback system of the VEMP machine were monitored by the subject and investigator during the recording period. EMG signals were amplified and band pass-filtered between 20 and 2000 Hz. Sound stimuli (500 Hz) were presented through headphones as rarefaction clicks 0.1 ms in duration and at a frequency of 5 Hz. In total, 128 stimuli were applied to each ear and repeated twice consecutively at a 125 dB nHL."}

{"project":"2_test","denotations":[{"id":"26527349-16481825-60553892","span":{"begin":367,"end":369},"obj":"16481825"}],"text":"For cVEMP testing, the active electrode was placed on the upper one-third of the sternocleidomastoid (SCM) muscle, ipsilateral to the sound stimulation, with the reference electrode on the anterior margin of the clavicle and the ground electrode on the forehead. Patients were tested in a seated position. To contract the SCM, we used the blood pressure cuff method [27]. Subjects had to flex the head ~30° forward and rotate it ~30° to the opposite side. While holding the cuff between the right hand and jaw, the subject pushed with her head against the hand-held cuff to generate a cuff pressure of 40 mmHg. The obtained cuff pressures and background muscle activity based on visual feedback system of the VEMP machine were monitored by the subject and investigator during the recording period. EMG signals were amplified and band pass-filtered between 20 and 2000 Hz. Sound stimuli (500 Hz) were presented through headphones as rarefaction clicks 0.1 ms in duration and at a frequency of 5 Hz. In total, 128 stimuli were applied to each ear and repeated twice consecutively at a 125 dB nHL."}