The goal of this prospective cohort study is to investigate cardiac comorbidity in a random sample of approximately 1200 patients from a population of outpatients with rheumatoid arthritis and axial spondyloarthritis referred to collectively as inflammatory arthritis (IA). The main questions it aims to answer are:

• Using conventional echocardiography, the investigators aim to determine the prevalence of overt and asymptomatic cardiac dysfunction in a large random sample of outpatients with IA. Cardiac dysfunction will be evaluated by echocardiography and cardiac biomarkers (NT-pro-BNP, hs-TNT and hs-CRP).
• In patients without known heart disease: Using 2, 5 and 10 year follow-up, the investigators aim to examine if advanced echocardiography can be used to detect early signs of heart disease by investigating the clinical significance of adding deformation measures - alone and in combination with selected biomarkers - to conventional risk factors in the cardiac risk assessment of patients with IA

Participants will undergo an echocardiographic examination in combination with a general health assessment including obtainment of cardiac biomarkers and a electrocardiogram.

Using advanced echocardiography - Tissue Doppler Imaging, 2- dimensional speckle tracking echocardiography, 3D-echocardiography and 3-dimensional speckle tracking echocardiography - the investigators also aim to compare myocardial deformation parameters of patients with IA to a gender and age matched control group without IA from the Copenhagen City Heart Study.

Inclusion Criteria:

• Persons with a diagnosis of with a confirmed diagnosis of rheumatoid Arthritis or axial spondyloarthritis

Exclusion Criteria:

• Persons not able to cooperate
• Persons unable understand and sign "informed consent"

In order to approximate a random sample as accurate as possible, all patients with a diagnosis of rheumatoid Arthritis or axial spondyloarthritis followed in DANBIO in the capital region of Denmark will be eligible to participate. DANBIO is a nationwide registry of patients with rheumatoid Arthritis or axial spondyloarthritis and is approved as a clinical quality registry by the Danish National Board of Health in 2006.