title: Functional capacity is significantly impaired in primary biliary cirrhosis and is related to orthostatic symptoms.
abstract: OBJECTIVE
  To assess patient-reported functional ability and its relationship with symptoms in primary biliary cirrhosis (PBC).
  
  
  METHODS
  Functional status was assessed in a representative cohort of 75 patients with PBC using the Patient-Reported Outcome Measure Information System Health-Assessment Questionnaire (PROMIS-HAQ) functional assessment tool and was related to both symptom severity at the point of assessment (assessed using the PBC-40 and Orthostatic Grading Scale) and symptom severity change over the previous 4 years. Functional status in the PBC group was compared with primary sclerosing cholangitis (cholestatic liver disease) and community controls.
  
  
  RESULTS
  Functional impairment at follow-up (PROMIS-HAQ) was substantial in PBC significantly higher than that in both primary sclerosing cholangitis and community controls. PROMIS-HAQ domain scores confirmed that patients with PBC had significant impairment in arising, eating, walking, reach and grip and activity, but not dressing or hygiene. Functional impairment correlated positively with greater PBC-40 Fatigue, Cognitive and Social and Emotional domains and higher orthostatic symptoms. Over 4 years, total symptom burden increased significantly (P=0.03). The predominant factor was rise in Cognitive domain scores indicating worsening cognitive symptoms (P<0.0001). Change in PBC-40 Cognitive, Social and Emotional scores (2005-2009) strongly predicted functional ability in 2009. Multivariate analysis confirmed that PROMIS-HAQ scores were predicted independently by PBC-40 Social and Emotional scores (P=0.02; β=0.3) and orthostatic symptoms (P=0.04; β=0.3).
  
  
  CONCLUSIONS
  PBC associates with substantial functional impairment. PBC symptom distribution evolves over time, with cognitive symptoms making ever-greater contribution to overall symptom burden. The major potentially modifiable determinant responsible for the functional impairment appears to be orthostatic symptoms.
authors: Institute of Cellular Medicine, Newcastle University, NIHR Biomedical Research Centre in Ageing-Liver Theme, Newcastle-upon-Tyne, UK. j.l.newton@ncl.ac.uk
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