Predictors in late-stage amyotrophic lateral sclerosis.

Area of Science:

• Neurology
• Clinical Medicine
• Biostatistics

Background:

• Prognostic factors in amyotrophic lateral sclerosis (ALS) are established for early stages but uncertain for late-stage disease.
• Identifying predictors of survival in advanced ALS is crucial for patient management and clinical trial design.

Purpose of the Study:

• To identify demographic and clinical factors that predict survival in patients with advanced amyotrophic lateral sclerosis (ALS).

Main Methods:

• Analysis of data from 704 patients in late-stage ALS (ALSFRS-R ≤ 24) and 260 patients followed for ≥ 6 months thereafter.
• Multivariable Cox regression analysis incorporating variables such as phenotype, age, diagnostic delay, noninvasive ventilation (NIV), percutaneous endoscopic gastrostomy (PEG), and functional progression rates (ΔFS).

Main Results:

• In advanced ALS (Group A), bulbar-onset and functional decline from diagnosis to late stage predicted shorter survival.
• In patients followed post-late stage (Group B), older age, bulbar-onset, shorter diagnostic delay, and functional decline (both pre-late and late-stage) predicted shorter survival.
• Initial functional decline at diagnosis was not a significant predictor in late-stage patients.

Conclusions:

• Survival in advanced ALS is influenced by age, region of onset, and diagnostic delay, similar to the general ALS population.
• While late-stage functional decline is prognostic, early functional decline at diagnosis is not a reliable predictor for advanced disease.
• Continuous monitoring of functional decline is essential for prognostic assessment in patients with advanced ALS.