Assessing Impulse Control Disorders in Parkinson's Disease: Patient vs Caregiver Perspectives

Overview

This study compared impulse control disorder assessments in Parkinson's disease patients treated with dopamine agonists and their caregivers using the QUIP-RS and ICDRC questionnaires. Results showed no consistent systematic differences overall, though patients reported slightly higher scores for certain behaviors and exhibited a wider range of responses in hypersexuality and gambling domains. The findings highlight ongoing challenges in accurately assessing impulse control disorders in this population.

Background

Impulse control disorders (ICDs) are common behavioral complications in Parkinson's disease (PD) patients treated with dopamine agonists, affecting up to 17% and potentially over 50% within five years. These disorders include pathological gambling, hypersexuality, compulsive shopping, and binge eating, as well as related behaviors like punding and dopamine dysregulation syndrome. Patients often underreport these symptoms, complicating clinical detection. Validated tools such as the QUIP-RS and ICDRC questionnaires have been developed to improve assessment, with caregiver input suggested as a valuable supplement.

Data Highlights

Key Findings

• No consistent systematic differences were found between patient and caregiver assessments on QUIP-RS and ICDRC overall.
• Patients reported slightly higher total ICDRC scores compared to caregivers.
• Patients indicated higher combined subscores for punding and dopamine dysregulation syndrome than caregivers.
• Patient evaluations showed a wider range of responses for hypersexuality and gambling domains.
• The role of caregiver evaluations in assessing impaired impulse control remains uncertain.

Clinical Implications

Clinicians should be aware that patients with Parkinson's disease may report impulse control symptoms differently than their caregivers, with some behaviors potentially under- or over-reported. Incorporating both patient and caregiver perspectives may provide a more comprehensive assessment, though the added value of caregiver input requires further clarification. Continued use of validated tools like QUIP-RS and ICDRC is recommended to improve detection and monitoring of impulse control disorders.

Conclusion

Assessment of impulse control disorders in Parkinson's disease remains challenging, with patient and caregiver reports showing some differences but no clear systematic bias. Further research is needed to clarify the optimal approach for incorporating caregiver evaluations into clinical practice.

References

1. Baumann-Vogel et al. 2022 -- Impulse Control Disorders and Related Conditions in Parkinson’s Disease
2. Weintraub et al. 2010 -- Questionnaire for Impulsive-Compulsive Disorders in Parkinson’s Disease-Rating Scale (QUIP-RS)
3. IPAPS Study 2020-2022 -- ICD Parkinson Agonist Pharmacology Study