Edited sentence: It remains an exeptional method of monitoring volume overload leading to pulmonary edema in an ICU setting.Noninvasive echocardiography is becoming concordant with (and much safer) if not better than invasive methods defining right and left heart performance.Swan and Ganz should be recognized further for this unique advance from the 1970s.This interpretation of Adolph Ficks' formulation for Cardiac Output by time/temperature curves is an excellent but limited and invasive model of right heart performance