Cardiovascular Autonomic Responses in Patients with Parkinson Disease to Pedunculopontine Deep Brain Stimulation

Overview

Journal Clin Auton Res

Date 2019 Sep 8

PMID 31493114

Citations 7

Authors

Jonathan A Hyam

Holly A Roy

Yongzhi Huang

Sean Martin

Shouyan Wang

Jodi Rippey

Terry J Coyne

Ian Stewart

Graham Kerr

Peter Silburn

David J Paterson

Tipu Z Aziz

Alexander L Green

Affiliations

Soon will be listed here.

Abstract

Purpose: Dysautonomia can be a debilitating feature of Parkinson disease (PD). Pedunculopontine nucleus (PPN) stimulation may improve gait disorders in PD, and may also result in changes in autonomic performance.

Methods: To determine whether pedunculopontine nucleus stimulation improves cardiovascular responses to autonomic challenges of postural tilt and Valsalva manoeuver, eight patients with pedunculopontine nucleus deep brain stimulation were recruited to the study; two were excluded for technical reasons during testing. Participants underwent head up tilt and Valsalva manoeuver with stimulation turned ON and OFF. Continuous blood pressure and ECG waveforms were recorded during these tests. In a single patient, local field potential activity was recorded from the implanted electrode during tilt.

Results: The fall in systolic blood pressure after tilt was significantly smaller with stimulation ON (mean - 8.3% versus - 17.2%, p = 0.044). Valsalva ratio increased with stimulation from median 1.15 OFF to 1.20 ON (p = 0.028). Baroreflex sensitivity increased during Valsalva compared to rest with stimulation ON versus OFF (p = 0.028). The increase in baroreflex sensitivity correlated significantly with the mean depth of PPN stimulating electrode contacts. This accounted for 89% of its variance (r = 0.943, p = 0.005).

Conclusion: PPN stimulation can modulate the cardiovascular system in patients with PD. In this study, it reduced the postural fall in systolic blood pressure during head-up tilt and improved the cardiovascular response during Valsalva, presumably by altering the neural control of baroreflex activation.

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