“…Nevertheless, a range of preoperative risk factors for UPE have received attention: advanced age, diabetes mellitus, chronic obstructive pulmonary disease, elevated leucocyte count, serum creatinine and C-reactive protein, etc. [4,6]. Echocardiographic findings such as pulmonary hypertension, left ventricular ejection fraction < 50%, significant right ventricular dysfunction and a pathological right pulmonary vein Doppler profile are additionally associated with UPE [1,[4][5][6].…”