CTEPH Identification an Standard Computerised Tomography Pulmonary Angiography in Pulmonary Embolism Patients

The investigators will study 50 consecutive patients diagnosed with CTEPH as well as 50 patients diagnosed with acute PE in whom CTEPH was ruled out 2 years after the PE diagnosis by sequential echocardiography. The cases and controls will be matched based on the right-to-left ventrilcle diameter ratio.

Three experienced thorax radiologists with specific expertise on acute PE and CTEPH will blindly assess the index CTPAs of the study population. In addition to the binominal judgement whether CTEPH signs are already present (or not), the presence of the following items will be scored by all 3 readers independently:

• Webs or bands
• Residual thrombus attached to the vascular wall
• Complete occlusion /retraction
• Mosaic perfusion
• Pulmonary infarct
• Parenchymal bands
• Bronchial arteries
• Right atrial (RA) dilatation
• Right ventricle (RV) dilatation
• Flattening of the septum
• Right ventricle (RV) hypertrophy
• Dilated truncus pulmonalis
• Cardiac signs of pulmonary hypertension (PH)
• Further remarks (free text)

Inclusion criteria

• patients after an acute PE diagnosed with CTEPH according to current guidelines, patients after an acute PE in whom CTEPH is excluded by follow-up echocardiography
• availability of the CTPA scan of the initial PE episode

Exclusion criteria

• CTEPH diagnosis based on other test results than a RHC
• Patients who did not receive anticoagulation after PE diagnosis
• Patients under the age of 18 years old
• Patients in the control group with a follow-up duration of less than 2 years after the index PE episode
• Use of a CTPA scanner with less than 32-detector rows