Clinically relevant cut-off values for the Parkinson's Disease Sleep Scale-2 (PDSS-2): a validation study

Area of Science:

• Neurology
• Sleep Medicine
• Clinical Assessment

Background:

• Sleep disturbances significantly impact Parkinson's disease (PD) patient care.
• The Parkinson's Disease Sleep Scale-2 (PDSS-2) is a validated patient self-rating scale for PD-specific sleep issues.
• Establishing cut-off scores for PDSS-2 is crucial for identifying patients needing intervention.

Purpose of the Study:

• To determine PDSS-2 cut-off values for clinically significant sleep disturbances in European Parkinson's disease patients.
• To identify thresholds indicating the need for referral to a sleep center or specific treatment.

Main Methods:

• Inclusion of inpatients with idiopathic PD.
• Administration of the PDSS-2 to patients.
• Physician evaluation of sleep problems (blinded to PDSS-2 scores).
• Statistical analysis to correlate PDSS-2 scores with physician assessments and establish cut-off values.

Main Results:

• PDSS-2 demonstrated 77.6% sensitivity and 74.3% specificity for physician-evaluated PD-specific sleep problems.
• A PDSS-2 score of 18 or higher identified 83% of patients with clinically relevant sleep disturbances.
• PDSS-2 total score showed a moderate correlation (r=0.49) with the severity of PD-specific sleep problems.

Conclusions:

• This study establishes PDSS-2 cut-off values for sleep disturbance severity in a European PD cohort.
• A PDSS-2 score of ≥18 is indicative of clinically relevant, PD-specific sleep disturbances.
• These findings aid in the clinical assessment and management of sleep issues in Parkinson's disease.