A young man diagnosed with chronic thromboembolic pulmonary hypertension after COVID-19 infection: A case report.

Chronic thromboembolic pulmonary hypertension (CTEPH) is a rare disease characterized by pulmonary hypertension (PH), resulting from stenosis or occlusion of the pulmonary arteries owing to an organic thrombus that obstructs blood flow in the pulmonary arteries. The prognosis for untreated patients is poor; however, it has improved significantly with the advent of treatments such as PH-targeted medical therapy and pulmonary balloon angioplasty, in addition to pulmonary endarterectomy. Nevertheless, the exact mechanisms underlying this disease remain unknown. Recently, a close association between coronavirus disease 2019 (COVID-19) and thrombosis has been detected, with the risk of venous thrombosis complications increasing after COVID-19 infection; however, few studies have reported on the association between COVID-19 and CTEPH. Herein, we present the case of a young man who developed CTEPH after a mild COVID-19 infection, despite the lack of an obvious thrombophilic predisposition. We conclude that if a patient develops chronic shortness of breath symptoms after a COVID-19 infection, it is important to investigate not only the COVID-19 sequelae, but also the presence of other diseases such as pulmonary artery thrombosis. Learning objective: Coronavirus disease 2019 (COVID-19) infection frequently causes abnormal blood coagulation and is closely related to thrombosis. Although pulmonary embolism is a frequent complication of venous thrombosis, few studies have reported an association between COVID-19 and chronic thromboembolic pulmonary hypertension (CTEPH). Our patient developed CTEPH after COVID-19 infection. It is important to examine organic abnormalities, before diagnosing persistent dyspnea as a COVID-19 sequela.