• Ahmed Jorge, Christina Dastolfo-Hromack, Witold J Lipski, Ian H Kratter, Libby J Smith, Jackie L Gartner-Schmidt, and R Mark Richardson.
• Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
• Neurosurgery. 2020 Sep 15; 87 (4): 788795788-795.

BackgroundDespite the impact of Parkinson disease (PD) on speech communication, there is no consensus regarding the effect of lead location on voice-related outcomes in subthalamic nucleus (STN) deep brain stimulation (DBS).ObjectiveTo determine the relationship of stimulation location to changes in cepstral analyses of voice following STN DBS.MethodsSpeech pathology evaluations were obtained from 14 PD subjects, before and after STN DBS, including audio-perceptual voice ratings (overall severity, loudness, hoarseness changes), measured indices of dysphonia (cepstral peak prominence and cepstral spectral index of dysphonia), and phonatory aerodynamics. The contact locations used for active stimulation at the time of postoperative voice evaluations were determined and assessed in relation to voice outcomes.ResultsVoice outcomes remained relatively unchanged on average. Stimulation locations in the anterior portion of the sensorimotor region of the left STN, however, were associated with improvements in voice severity scores, cepstral spectral index of dysphonia, shortness of breath, and phonatory airflow during connected speech. Posterior locations were associated with worsening of these outcomes. Variation in the medial-lateral or dorsal-ventral position on the left, and in any direction on the right, did not correlate with any voice outcome.ConclusionActive contact placement within the anterior sensorimotor STN was associated with improved perceptual and acoustic-aerodynamic voice-related outcomes. These findings suggest an STN topography for improving airflow for speech, in turn improving how PD patients' voices sound.Copyright © 2020 by the Congress of Neurological Surgeons.

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