Nutritional Factors and Weight Loss Predict Tracheostomy-Free Survival in Multiple System Atrophy

Area of Science:

• Neurology
• Nutritional Science

Background:

• Multiple System Atrophy (MSA) is characterized by progressive weight loss and nutritional decline.
• The prognostic impact of specific nutritional factors in MSA is not well understood.

Purpose of the Study:

• To evaluate the prognostic value of nutritional parameters, specifically prognostic nutritional index (PNI) and annual body mass index (BMI) decline (∆BMI), in MSA patients.
• To identify key predictors of survival in individuals diagnosed with MSA.

Main Methods:

• Retrospective analysis of 215 MSA patients diagnosed using 2022 Movement Disorder Society Criteria.
• Assessment of baseline parameters including PNI, BMI, and Unified MSA Rating Scale (UMSARS) scores.
• Calculation of annual BMI decline (∆BMI) post-diagnosis and survival analysis using log-rank and Cox proportional hazards models.

Main Results:

• Lower PNI, greater ∆BMI, higher UMSARS Part I-item 2 scores, and orthostatic hypotension were associated with shorter survival.
• Multivariate analysis confirmed PNI (HR 2.12), ∆BMI (HR 2.90), and UMSARS Part I-item 2 scores (HR 1.59) as independent predictors of reduced survival.

Conclusions:

• Nutritional decline, reflected by PNI and ∆BMI, independently predicts shorter survival in MSA.
• These findings highlight the importance of monitoring nutritional status alongside swallowing function for better clinical management of MSA patients.