Capacity limitations in neurology patients, with and without comorbid mental disorders

According to the International Classification of Functioning, Disability, and Health (ICF) symptoms of illness and capacity limitations must be kept apart and assessed separately. Psychological capacities are more important than physical capacities in today's world. Patients with neurological disorders not only show limitations in physical but also in psychological capacities. As in many cases there is comorbidity of neurological and mental disorders the question is to what degree this can increase psychological incapacity.

Using a cross-sectional study design, neurological patients with and without mental comorbidity were recruited in a department of neurological phase D rehabilitation. A total of 114 inpatients with both neurological and mental disorders (NM) were compared with 214 unselected patients with neurological disorders only (N). Mental comorbidity was diagnosed with the standardized "International Neuropsychiatric Interview". Capacity limitations were assessed with the "Activities and Participation in Psychological Disorders according to the International Classification of Functioning, Disability and Health" scale (Mini-ICF-APP). Qualitative reports of patients were used to validate the Mini-ICF-APP ratings. Clinical diagnoses were taken from the routine patient evaluation.

Severe capacity limitations, which are in need of support by others, could be observed especially for endurance (NM: 73.7% vs. N: 59.8% of patients), flexibility (NM: 43.0% vs. N: 22.4%), professional competency (NM: 36.0% vs. N: 16.8%), structuring of tasks (NM: 32.5% vs. N: 15.0%). Least frequent were impairment in dyadic relationships (NM: 23.7% vs. N: 7.9%). The rank order and the qualitative descriptions of impairments were similar in both groups.

Patients with neurological disorders in general show a relevant degree of capacity limitations. This is further substantially increased by mental comorbidity. Specific treatment is necessary.