The Effect of Left Ventricular Filling Pressure on Pulmonary Clearance of Free Radical Loaded White Blood Cells and Platelets in Congestive Heart Failure Patients Before and After Biventricular Pacing

1. To assess whether a correlation exist between the degree of pulmonary clearance of free radical positive white bloodcells and platelets and the degree of pulmonary congestion in congestive heart failure (CHF) patients 2. To asses whether cardiac resynchronization therapy improves pulmonary clearance of free radical positive white blood cells and platelets in CHF patients by alleviating pulmonary congestion 3. Interaction of oxidative stress with circulating endothelial progenitor cells (EPCs) and presence of apoptotic endothelial (progenitor) cells