RT Journal Article SR Electronic T1 Impact of age and comorbidity on risk stratification in idiopathic pulmonary arterial hypertension JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1702310 DO 10.1183/13993003.02310-2017 VO 51 IS 5 A1 Clara Hjalmarsson A1 Göran Rådegran A1 David Kylhammar A1 Bengt Rundqvist A1 Jonas Multing A1 Magnus D. Nisell A1 Barbro Kjellström A1 , YR 2018 UL http://erj.ersjournals.com/content/51/5/1702310.abstract AB Recent reports from worldwide pulmonary hypertension registries show a new demographic picture for patients with idiopathic pulmonary arterial hypertension (IPAH), with an increasing prevalence among the elderly.We aimed to investigate the effects of age and comorbidity on risk stratification and outcome of patients with incident IPAH.The study population (n=264) was categorised into four age groups: 18–45, 46–64, 65–74 and ≥75 years. Individual risk profiles were determined according to a risk assessment instrument, based on the European Society of Cardiology and the European Respiratory Society guidelines. The change in risk group from baseline to follow-up (median 5 months) and survival were compared across age groups. In the two youngest age groups, a significant number of patients improved (18–45 years, Z= −4.613, p<0.001; 46–64 years, Z= −2.125, p=0.034), but no significant improvement was found in the older patient groups. 5-year survival was highest in patients aged 18–45 years (88%), while the survival rates were 63%, 56% and 36% for patients in the groups 46–64, 65–74 and ≥75 years, respectively (p<0.001). Ischaemic heart disease and kidney dysfunction independently predicted survival.These findings highlight the importance of age and specific comorbidities as prognostic markers of outcome in addition to established risk assessment algorithms.Change in risk category at follow-up and specific comorbidity predict survival in IPAH across age groups http://ow.ly/EPQ530j765F