The Influence of Cardiopulmonary Bypass on the Extravascular Lung Water Volume in Patients Who Underwent Either a Coronary Artery Bypass Graft or a Mitral Valve Replacement

To examine the influence of cardiopulmonary bypass (CPB) on the extravascular lung water volume (ELWV), the extravascular thermal volume (ETV) was thus measured by means of the double indicator dilution method using heat and sodium ion in 19 patients who underwent either a mitral valve replacement (MVR; n=9) or a coronary artery bypass graft (CABG; n=10). The results were as follows: 1) The postoperative ELWV did not increase. 2) Before surgery, the ELWV was observed to be significantly higher in the patients who underwent MVR than in those who underwent CABG. After the operation, an immediate significant decrease in the ELWV was observed in the patients who underwent MVR. This decrease in the ELWV was thus affected by the improved hemodynamic status which was achieved as a result of the operation