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Changes of Brain Natriuretic Peptide Levels according to Right Ventricular HemodynaMics after a Pulmonary Resection  

Na, Myung-Hoon (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University)
Han, Jong-Hee (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University)
Kang, Min-Woong (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University)
Yu, Jae-Hyeon (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University)
Lim, Seung-Pyung (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University)
Lee, Young (Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University)
Choi, Jae-Sung (Department of Thoracic and Cardiovascular Surgery, Dongguk University International Hospital)
Yoon, Seok-Hwa (Department of Anesthesiology, College of Medicine, Chungnam National University)
Choi, Si-Wan (Department of Internal Medicine, College of Medicine, Chungnam National University)
Publication Information
Journal of Chest Surgery / v.40, no.9, 2007 , pp. 593-599 More about this Journal
Abstract
Background: The correlation between levels of brain natriuretic peptide (BNP) and the effect of pulmonary resection on the right ventricle of the heart is not yet widely known. This study aims to assess the relationship between the change in hemodynamic values of the right ventricle and increased BNP levels as a compensatory mechanism for right heart failure following pulmonary resection and to evaluate the role of the BNP level as an index of right heart failure after pulmonary resection. Material and Method: In 12 non small cell lung cancer patients that had received a lobectomy or pnemonectomy, the level of NT-proBNP was measured using the immunochemical method (Elecsys $1010^{(R)}$, Roche, Germany) which was compared with hemodynamic variables determined through the use of a Swan-Garz catheter prior to and following the surgery. Echocardiography was performed prior to and following the surgery, to measure changes in right ventricular and left ventricular pressures. For statistical analysis, the Wilcoxon rank sum test and linear regression analysis were conducted using SPSSWIN (version, 11.5). Result: The level of postoperative NT-proBNP (pg/mL) significantly increased for 6 hours, then for 1 day, 2 days, 3 days and 7 days after the surgery (p=0.003, 0.002, 0.002, 0.006, 0.004). Of the hemodynamic variables measured using the Swan-Ganz catheter, the mean pulmonary artery pressure after the surgery when compared with the pressure prior to surgery significantly increased at 0 hours, 6 hours, then 1 day, 2 days, and 3 days after the surgery (p=0.002, 0,002, 0.006, 0.007, 0.008). The right ventricular pressure significantly increased at 0 hours, 6 hours, then 1 day, and 3 days after the surgery (p=0.000, 0.009, 0.044, 0.032). The pulmonary vascular resistance index [pulmonary vascular resistance index=(mean pulmonary artery pressure-mean pulmonary capillary wedge pressure)/cardiac output index] significantly increased at 6 hours, then 2 days after the surgery (p=0.008, 0.028). When a regression analysis was conducted for changes in the mean pulmonary artery pressure and NT-proBNP levels after the surgery, significance was evident after 6 hours (r=0.602, p=0.038) and there was no significance thereafter. Echocardiography displayed no significant changes after the surgery. Conclusion: There was a significant correlation between changes in the mean pulmonary artery pressure and the NT-proBNP level 6 hours after a pulmonary resection. Therefore, it can be concluded that changes in NT-proBNP level after a pulmonary resection can serve as an index that reflects early hemodynamic changes in the right ventricle after a pulmonary resection.
Keywords
Lung surgery; Heart ventricle function; Hemodynamics; Echocardiography; Brain natriuretic peptide;
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