CMR Exercise Stress Testing in HFpEF

Inclusion Criteria: * adult patients with dyspnoea under stress, echocardiographic criteria for diastolic dysfunction (E/E'\>8) and clinical indication for right heart catheterisation Exclusion Criteria: * arrhythmia (brady- or tachycardic) * bronchial asthma (allergic) * incompliant patient * pacemaker, ICD, non MRI-capable devices * inability to use the ergometer in the MRI * haemodynamic relevant valvular heart disease * pulmonary disease (vital capacity or forced expiratory flow \<80% of healthy control) * angina pectoris * post cardiac infarction * anaemia (Hb \<12 g/dl) * uncontrollable hypertension (\>150 mmHg systolic or \>100 mmHg diastolic) * age \<18 years * pregnancy * claustrophobia * renal insufficiency * allergic to gadolinium based contrast agents