Behavioural changes predict poorer survival in amyotrophic lateral sclerosis.

OBJECTIVE

The Motor Neuron Disease Behavioural Scale (MiND-B) is a clinically validated tool that was developed to detect behavioural dysfunction in patients with amyotrophic lateral sclerosis (ALS). The current study aimed to evaluate behavioural impairment using MiND-B, as well as cognitive dysfunction in ALS patients, and to determine their prognostic implications.

METHOD

Patients with a clinical diagnosis of ALS were prospectively recruited from a specialised multidisciplinary ALS clinic. Patients underwent behavioural assessment with the Motor Neuron Disease Behavioural Scale (MiND-B) and cognitive evaluation using the Addenbrooke's Cognitive Examination (ACE). Primary outcome measure was selected as survival time, defined by time from assessment to time of death or censor date. Univariate assessment of survival effect was carried out using Kaplan-Meier survival analysis followed by cox regression analysis to assess the effect of MiND-B and ACE scores on survival time.

RESULTS

A total of 134 patients were included in the study. MiND-B testing determined that 59% were classified as having behavioural dysfunction, with deficits associated with a significantly shorter survival time (HR 2.53, p = 0.003, 95% CI 1.3-4.6). Furthermore, regression analysis demonstrated that for every 1-point reduction in the MiND-B score, risk of death increased by 3%. ACE testing established that 33% of the cohort had evidence of cognitive dysfunction. Patients with cognitive dysfunction on ACE testing had a significantly shorter survival time than patients without cognitive impairment (HR 2.0, p = 0.042, 95% CI 1.04-3.3).

CONCLUSION

The presence of behavioural and cognitive impairments in ALS patients was associated with poor survival. The MiND-B and ACE inventories are simple and efficient clinical tools that can be administered in the multidisciplinary ALS clinic, that aid in the prognostication of this patient population.