Assessment of Cardiac Function Using Combined Cardiovascular Magnetic Resonance and Cardiopulmonary Exercise Testing (CMR-CPET)

Clinical Cardiac MRI scan at rest with routine administration of gadolinium contrast agent. Participants then undergo the research component of the test which requires them to perform exercise, using a recumbent, MRI-compatible cycle ergometer, whilst their breathing is simultaneously analysed using a mask connected to a CPET machine, until they are limited by symptoms and they stop pedalling. Most participants will undergo only one scan. Some participants will be asked to have two or three such scans over 3 months to assess changes over time, and in response to standard treatment of pulmonary hypertension.