Kernrechtsfrage
Whether the insured person proved a material deterioration of health justifying revision of the invalidity pension.
Extrahierter Entscheid
No material deterioration since the prior pension decision was established; the previous 50% work capacity assessment remained applicable.
Extrahierte Begründung
Under Art. 17 ATSG, a revision requires a substantial change in factual circumstances. The medical record and MEDAS expertise did not show a relevant worsening of physical or psychiatric limitations.