The information collected should include: o Anonymised patient details – age, sex and aetiology of PAH o Concomitant medications o Reason for discontinuation o ADRs o All serious ADRs o Increase in hepatic enzymes to > 3 × ULN o Anaemia o Haemorrhage o Pregnancy and outcome o Pulmonary oedema (associated with veno-occlusive disease) o Suspected interactions o Unexpected ADRs according to the SPC.