“…In the group of patients who received a posterior pericardial drainage, 1447 patients underwent PP 11,[19][20][21][22][23][24][25][26][28][29][30][33][34][35][36][37] ; in 103 patients, a chest tube was placed within the posterior pericardium 27,30 ; 173 patients received both PP and posterior pericardium chest tube. 31,32 On-pump coronary artery bypass grafting (CABG) was the most frequently performed cardiac procedure, 11,19,20,23,25,28,[30][31][32][33][34][35][36] followed by combined CABG and/or valve replacement. 21,22,24,37 Two studies reported on patients undergoing valve replacement and/or ascending aorta surgery 26,27 and another on patients who received offpump CABG alone.…”