This study was a single-center retrospective observational study approved by the hospital ethics committee, based on our institutional policy and IRB approval, and no informed patient's consent was needed for such a publication. It was conducted in a tertiary care center between June 2015 and June 2019 with 54 patients aged 18 years and older, who had CTEPH documented by high probability ventilationperfusion scintigraphy (VQ) scan, except one patient who had intermediate probability VQ scan. All patients underwent CTPA within 15 days from VQ scan. Subsequently, all patients underwent pulmonary artery endarterectomies (PEAs) thereafter as a definitive therapy for CTEPH. The mean time of the PEA after VQ scan was 4±3 months.

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