Dyspnea after subthalamic deep brain stimulation in Parkinson's disease: a case-control study.

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Dyspnea can be present as non-motor symptom in patients with Parkinson's disease (PD). Deep brain stimulation (DBS) of the subthalamic nucleus (STN) improves motor and non-motor symptoms in PD. However, new-onset dyspnea has been reported after DBS surgery. We have studied respiratory characteristics of PD patients with bilateral STN-DBS to assess the impact of DBS on pulmonary function.STN-DBS PD patients with dyspnea after surgery (cases) were matched with STN-DBS PD patients without dyspnea (controls). Motor and pulmonary function were assessed with stimulation and without medication (on stim/off med), and without stimulation and medication (off stim/off med). Pulmonary function was investigated with spirometry and dyspnea with the Medical Research Council Dyspnea Scale (MRCDS) and the Borg Scale (BS).Seven cases (five men, 58.30 ± 6.70 years of age) and seven controls (six men, 61.10 ± 6.30 years of age) were enrolled. MRCDS and BS revealed the presence of dyspnea in both groups. No significant changes in pulmonary function were found in both cases and controls in on stim/off med vs. off stim/off med condition (p 

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