Adult patients (≥18 years)

Clinically indicated left- and right-heart catheterisation under resting conditions

Availability of invasive left ventricular end-diastolic pressure (LVEDP) measurement

Availability of pulmonary capillary wedge pressure (PCWP) measurement

Availability of transthoracic echocardiography within 5 days of cardiac catheterisation

Adequate echocardiographic image quality for analysis

Non-Invasive and Invasive Assessment of Heart Filling Pressure