Propofol is a short-acting general anesthetic drug commonly used in clinical practice, with rapid clinical onset of action, amnesic, anxiolytic, antiepileptic, and muscle relaxant effects. The lack of natural antioxidants in patients with Parkinson's disease and propofol's ability to protect the brain by inhibiting oxidative stress, its pharmacokinetic and pharmacodynamic properties make propofol a suitable anesthetic drug for functional stereotactic surgery in patients with Parkinson's disease. However, changes in brain functional status during propofol anesthesia in Parkinson's patients are unknown. There is a lack of data from extensive clinical studies to support the need for propofol dosing during induction of anesthesia compared with non-Parkinson patients. This study is a prospective cohort study designed to compare the differences in propofol dosing requirements during induction of propofol anesthesia in patients with PD versus non-PD and to monitor the characteristics of altered brain functional status such as EEG and cerebral blood flow autoregulation capacity in PD versus non-PD patients during the perioperative period.

Inclusion Criteria:

PD group:

1. age 18-80 years, ASA class I-III, proposed bilateral DBS surgery;
2. primary PD, or hereditary PD, various genotypes of PD, responding well to compounded levodopa;
3. informed consent obtained;

Non-PD group:

1. age 18-80 years, ASA class I-III, proposed non-neurosurgical non-cardiac surgery;
2. no previous clearly diagnosed neurological disease or neurological dysfunction;
3. informed consent obtained.

Exclusion Criteria:

1. Obstructive sleep apnea;
2. BMI > 30kg/m2;
3. Estimated difficult airway;
4. Patients with prior allergy to anesthetic drugs;
5. Serious dysfunction of important organs (i.e. heart failure, renal or liver dysfunction);
6. Patients with craniocerebral trauma or craniocerebral operation history resulting in incomplete skull or brain parenchyma defect;
7. Patients with alcohol or drug addiction.

PD group: (1) age 18-80 years, ASA class I-III, proposed bilateral DBS surgery; (2) primary PD, or hereditary PD, various genotypes of PD, responding well to compounded levodopa; (3) informed consent obtained; Non-PD group: (1) age 18-80 years, ASA class I-III, proposed non-neurosurgical non-cardiac surgery; (2) no previous clearly diagnosed neurological disease or neurological dysfunction; (3) informed consent obtained.