1.How long does Parkinson’s usually produce dementia symptoms? A: We call dementia in Parkinson’s disease dementia only when it appears after one year of having Parkinson’s disease. So patients can appear after one year of Parkinson’s disease. The time of appearance varies from patient to patient, some appear after many years of Parkinson’s disease, and there are also patients who do not appear. If dementia appears within one year of developing Parkinson’s disease, we need to reassess whether it is primary Parkinson’s disease or other diseases such as dementia with Lewy bodies. 2. Is the early onset of dementia symptoms in Parkinson’s patients related to age? A: Older patients are more likely to develop dementia symptoms and earlier than younger patients. 3. Are Parkinson’s patients with cognitive impairment at an early stage more likely to develop dementia? A: Parkinson’s patients with cognitive impairment in the early stages are more likely to develop dementia. 4.How to recognize the symptoms of drug-induced psycho-cognitive disorders and Parkinson’s dementia? A: First of all, we need to ask the patient’s medication history and the time relationship between the emergence of psycho-cognitive impairment and medication use. Drugs used to treat Parkinson’s disease, such as anticholinergics, amantadine, dopamine agonists, MAO-B inhibitors, and COMT inhibitors, may cause psycho-cognitive disorders, but anticholinergics are in the first place. The corresponding mental cognitive disorders appearing soon after taking drugs should be considered to be related to drugs. 5.Are patients with poor drug control more likely to develop dementia? A: Poor drug control requires consideration of the possibility of Parkinson’s syndrome or Parkinson’s superimposed syndrome, and symptoms of dementia may be more common in patients. 6.How to identify Parkinsonian dementia and Parkinson’s drug-induced memory loss, cognitive impairment and other adverse effects? A: Parkinson’s disease drug-induced memory loss and cognitive impairment often appear soon after taking the drug, and are closely related to the timing of the drug’s use. The dementia of Parkinson’s disease itself appears gradually with the progress of the disease. 7. Will installing a pacemaker lead to earlier onset of dementia symptoms? A: There is no evidence to suggest that the installation of a pacemaker will lead to earlier onset of dementia.