RT Journal Article SR Electronic T1 A case of unilateral pulmonary oedema associated with severe acute mitral regurgitation JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 160 OP 162 DO 10.7861/clinmed.2021-0770 VO 22 IS 2 A1 Yaopu Shi A1 Jihong Zhang A1 Shengda Liu A1 Wei Miao A1 Qinghai Zhang YR 2022 UL http://www.rcpjournals.org/content/22/2/160.abstract AB A 44-year-old woman presented to the emergency department with sudden chest tightness and breathlessness, and a chest X-ray revealed unilateral pulmonary oedema (UPO). Colour Doppler echocardiography showed that the leaflet prolapsed with severe regurgitation, and the regurgitant jet tended to blow rightward within the left atrium. With the assistance of mechanical ventilation and venoarterial extracorporeal membrane oxygenation, the patient underwent mitral valve replacement. UPO is easily misdiagnosed, which leads to delays in treatment. Therefore, accurate diagnosis and immediate treatment are crucial.