title: Effects of minimal invasive coronary artery bypass on pulmonary function and postoperative pain.
abstract: BACKGROUND
  Minimally invasive direct coronary artery bypass (MIDCAB) requires substantially smaller incisions than conventional coronary artery bypass grafting (CABG). We investigated whether this fact may lead to less postoperative pain and improved pulmonary function.
  
  
  METHODS
  Preoperative and postoperative (days 1, 3, and 5) pulmonary function and postoperative pain were assessed in 15 patients undergoing MIDCAB (group A) by using a standardized score and were compared with 15 patients admitted for CABG (group B).
  
  
  RESULTS
  Total operation time (140 minutes versus 189 minutes; p<0.001) and duration of mechanical ventilation (300 minutes versus 840 minutes; p<0.001) were significantly less in group A. Pulmonary function was comparable between the 2 groups on postoperative day 1 (POD 1). Vital capacity was significantly greater in group A on POD 3 (59.7% versus 40.6%; p<0.001) and on POD 5 (74.4% versus 53.9%; p<0.001). Similar results were found for forced expiratory volume in 1 second (group A versus B on POD 3: 56.3% versus 42.2%; p<0.05; and on POD 5: 68.4% versus 55.5%; p<0.01). Postoperative pain was significantly higher in group A (POD 1: score 5.5 versus 3.6; POD 3: 4.0 versus 2.9; p<0.01).
  
  
  CONCLUSIONS
  MIDCAB procedures lead to better preservation of pulmonary function compared with conventional CABG despite greater postoperative pain.
authors.affiliation: Division of Thoracic and Cardiovascular Surgery, Hannover Medical School, Germany. lichtenberg@thg.mh-hannover
authors.forename: A
authors.initials: A
authors.lastname: Lichtenberg
authors.forename: C
authors.initials: C
authors.lastname: Hagl
authors.forename: W
authors.initials: W
authors.lastname: Harringer
authors.forename: U
authors.initials: U
authors.lastname: Klima
authors.forename: A
authors.initials: A
authors.lastname: Haverich
mesh_terms: D000368:Aged; D001784:Blood Gas Analysis; D001026:Coronary Artery Bypass / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D010149:Postoperative Pain; D011184:Postoperative Period; D015656:Respiratory Mechanics